JPH0730950B2 - Heat pump water heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat pump hot water supply device for supplying hot water to an apartment house, a business hotel, etc., and particularly to a heat pump hot water supply device equipped with a failure diagnosis device for detecting an abnormality in the system at an early stage. Regarding the device.

[Conventional technology]

2. Description of the Related Art Conventionally, as a heat pump hot water supply device used in this kind of apartment house, a business hotel, etc., a device having a device configuration generally shown in FIG. 7 is generally known.

In the figure, 1 is an open-type hot water storage tank having a predetermined hot water storage capacity, 2 is a heat pump whose operation is controlled by an operation controller, which will be described later, and which heats and maintains hot water at a predetermined temperature, 3 is a heat pump from the bottom of the hot water storage tank 1. 2 is a hot water outgoing pipe, 4 is a hot water return pipe from the heat pump 2 to the upper part of the hot water storage tank 1, and 5 is a hot water circulating pump installed in the hot water outgoing pipe 3.

Further, 6 is a water supply pipe connected to the hot water outgoing pipe 3 between the hot water storage tank 1 and the hot water circulation pump 5, and 7 and 8 are hot water outgoing pipes and hot water return pipes connected to the hot water storage tank 1. ,
A plurality of hot water supply faucets 9 on the load side are connected between 8, and 10 is a hot water supply circulation pump interposed in the hot water supply pipe 7.

Further, 11 is an operation controller for maintaining high temperature water,
A solenoid valve 13 and a motorized two-way valve 1 that are sequentially installed in the water supply pipe 6 and the operation control of the heat pump 2 by the water level detection signal from the water level detector 12 that detects the hot water level in the hot water tank 1.
Open / close control of 4.

In such a structure, when hot water is supplied, the electric two-way valve 14 is opened by the signal from the water level detector 12 via the operation controller 11 to start water supply, and the outlet temperature of the heat pump 2 is adjusted to be constant during water supply. The water temperature in the hot water storage tank 1 is kept constant.

In addition, hot water is constantly circulated in the hot water supply load side pipes 7 and 8 by a hot water circulation pump 10.

In a conventional device having such a simple structure, even if a failure occurs, the failure location can be found immediately, so that it is not necessary to provide an expensive failure diagnosis device.

[Problems to be solved by the invention]

However, in recent years, a complicated heat pump device having a plurality of heat pumps and a plurality of hot water storage tanks has come to be used, and therefore, a device that does not have a failure diagnosis mechanism as in the conventional device has a malfunction. Or, at the time of a failure, even if some of the components fail, the configuration is complicated and it is difficult to judge the failure. Therefore, the administrator may not notice the abnormality, which may have a serious influence.

[Means for solving problems]

The present invention determines that the hot water circulating pump of the high temperature system is in failure when the temperature difference between the inlet and outlet of the high temperature side heat pump calculated by the temperature sensor is higher than the set temperature and there is no abnormality in other temperature data. A failure diagnosis unit is provided.

Further, the present invention, the temperature difference of the inlet and outlet calculated by the temperature sensor of the inlet and outlet temperature of the low-temperature side heat pump is higher than the set temperature, when there is no abnormality in other temperature data, the low-temperature hot water circulation pump is a failure. A failure diagnosis unit for determining that is provided.

[Action]

According to the present invention, the failure diagnosis unit causes the inlet / outlet temperature difference of the high temperature side heat pump or the low temperature side heat pump to be higher than the set temperature, and when there is no abnormality in other temperature data, the hot water circulating pump of the high temperature system or the low temperature system fails, and the design flow rate Is determined to have decreased.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 21 is a hot water storage tank for storing hot water for hot water supply, 22
Is a heat pump on the high temperature side that circulates and heats high temperature water, 23a, 23a
b is the heat pump 22 for the lower and upper parts of the hot water storage tank 21.
The forward pipe and the return pipe to be connected to 24, 24 is a short-circuit pipe that connects the forward pipe 23a and the return pipe 23b and bypasses the heat pump 22, and 25 is the three-way that connects the forward pipe 23a and the short-circuit pipe 24 and controls the inlet temperature of the heat pump 22. An electric valve, 26 is a sensor for controlling the three-way electric valve 25, 27 is a hot water circulation pump of a high temperature system installed between the three-way electric valve 25 and the heat pump 22 on the way of the outward pipe 23a, and 28 is a low temperature for storing low temperature water. Side hot water storage tank, 29 is a low temperature side heat pump for circulating and heating low temperature water, 30a, 30b
Is a forward and return pipe connecting the lower part of the low temperature side hot water storage tank 28 to the low temperature side heat pump 29, 31 is a low temperature system hot water circulation pump installed in the middle of the forward piping 30a, 32 is a high temperature side hot water storage tank 21
, A pipe connecting the lower part of the low temperature side hot water storage tank 28 to the upper part, 33 is a pipe for supplying high temperature water from the high temperature side hot water storage tank 21, 34 is a temperature sensor for detecting the temperature of hot water supplied from the high temperature side hot water storage tank 21, 35
Is a temperature sensor for detecting the temperature in the low temperature side hot water storage tank 28, 36 is a temperature sensor for detecting the temperature in the pipe 33, 37a and 37b are temperature sensors for detecting the inlet temperature and the outlet temperature of the high temperature side heat pump 22, respectively, and 38a. , 38b is a temperature sensor for detecting the inlet temperature and the outlet temperature of the low temperature side heat pump 29, 39 is the temperature sensor 34,35,36,37a, 37b, 38a, 38b input the detection value, the memory 47 in advance. Is a fault diagnosis unit that performs fault diagnosis of the device by the fault diagnosis program stored in
The result of failure diagnosis is displayed on the display unit 40 and printed by the printing unit 41 to give an alarm when an abnormality occurs. further,
42 is a water supply pipe provided in the lower part of the low temperature side hot water storage tank 28, 43 is a faucet provided in the middle of the pipe 33, 44 is a temperature detector 46c detecting that the temperature of the hot water in the pipe 33 is low, and the high temperature side hot water storage Tank 2
This is a hot water circulation pump that circulates the high temperature water of 1 and fills the pipe 33 with the high temperature water sequentially. Normally, the hot water circulation pump 44 has a timer function and is controlled by an internal control device (not shown) so as to stop the operation after several minutes of operation. 45a is a temperature detector installed at the bottom of the high temperature side hot water storage tank 21 and used to detect the temperature inside the hot water tank and determine whether or not a certain amount of hot water at a constant temperature has accumulated, and 45b is a low temperature side hot water storage tank. It is a temperature detector provided inside 28 for detecting the water temperature.

In such a configuration, in the hot water storage tank 28 on the low temperature side, the operation of the heat pump 29 is on / off controlled by a signal from the water temperature detector 45b in order to keep the water temperature constant. On the other hand, the high temperature side hot water storage tank 21 has a water temperature detector 46 in order to keep the amount of high temperature hot water constant.
The operation of the heat pump 22 is on / off controlled by the signal a. Further, the control of the temperature of the hot water supplied from the heat pump 22 is assumed to be maintained at a constant temperature of 60 ° C., for example.
This is performed by automatically controlling the opening degree of the three-way motorized valve 25 by the sensor 26 and making the inlet temperature constant at 55 ° C. with a temperature difference.

Normally, the heat pump device operates as described above, but at the same time, the temperature of each predetermined part is detected by the temperature sensors 34, 35, 36, 37a, 37b, 38a, 38b, and the failure diagnosis part 39 is detected by this detection signal. Equipment failures are monitored.

In this embodiment, when the temperature difference between the temperature sensors 23a and 23b at the inlet and outlet of the heat pump 22 on the high temperature side is higher than the set temperature, and there is no abnormality in other temperature data, the hot water circulation pump 27 of the high temperature system fails. And the temperature sensors 38a at the inlet and outlet of the heat pump 29 on the low temperature side,
When the temperature difference of 38b becomes higher than the set temperature and there is no abnormality in the other temperature data, it has a function of diagnosing the failure of the hot water circulation pump 31 of the low temperature system. These functions are shown in flowcharts in FIGS. 2 and 3, respectively.

In FIG. 2, the device is started by first turning on the power (S1), and the temperature sensors 34, 35, 36, 37a, 37b, 38a, 3
Input the temperature of each part from 8b (S2), high temperature side heat pump
It is judged whether the temperature difference between the inlet and outlet temperature sensors 23a, 23b of 22 is larger than the set value A (S4), and if it is higher than the set value A, it is judged whether there is any abnormality in other data (S5),
If there is no abnormality, the flow rate of the hot water circulation pump 27 of the high temperature system decreases and the abnormality is reported to the display unit 40 (S6), and the printing unit 41 outputs that fact (S7).

If it is smaller than the set value A in S4 or there is an abnormality in S5, the process returns to S2 and the temperature detection is continued.

A failure diagnosis is similarly performed for the low temperature system hot water circulation pump 31 (FIG. 3).

Next, FIG. 4 shows predicted measurement data by simulation of the inlet and outlet temperatures of the high temperature side heat pump 22 and the low temperature side heat pump 29 in the normal state. H _IN , H _OUT
Are the inlet temperature and outlet temperature of the high temperature side heat pump 22, L
_IN and L _OUT are graphs of the inlet temperature and the outlet temperature of the low temperature side heat pump 29, respectively. Note that L _OUT and L _IN may overlap during a certain time zone. In this case, the temperature difference between H _IN and H _OUT is about 5 ° C, and the maximum temperature difference between L _IN and L _OUT is 6 ~.
It is about 8 degrees Celsius. Fig. 5 shows high temperature hot water circulation pump
These are the predicted measurement data for 27 abnormal times. H _IN , H _OUT
Are graphs showing the inlet temperature and the outlet temperature of the high temperature side heat pump 22, respectively, and the temperature difference is always about 10 ° C. or more. FIG. 6 shows predictive measurement data when the low temperature system hot water circulation pump 31 is in an abnormal state. L _IN and L _OUT are graphs showing the inlet temperature and the outlet temperature of the low temperature side heat pump 29, respectively, and 0 to 1 (h), 6 to 9 (h), 15 to 24 as shown in the figure.
It can be seen that the temperature difference becomes 10 ° C or more in the time zone of (h). As described above, it is apparent that the difference in temperature between the inlet and the outlet of each heat pump becomes larger in the abnormal operation than in the normal operation by performing the simulation for various hot water supply loads.

As described above, in the present embodiment, in the failure diagnosis section 39, the detection signals from the temperature sensors 34, 35, 36, 37a, 37b, 38a, 38b are input, and the heat pump is executed by the failure diagnosis program stored in the memory 47 in advance. Since the failure diagnosis of the device is performed, an alarm can be notified when an abnormality occurs, and an abnormality of the hot water circulation pump 27 of the high temperature system and the hot water circulation pump 31 of the low temperature system can be detected.

[Advantages of the Invention] Since the present invention has a temperature sensor installed at a predetermined position of the apparatus, is configured to constantly detect the temperature, and the detection signal is used to diagnose whether or not there is an abnormality by the internal program of the failure diagnosing unit. It is possible to detect abnormalities in the hot water circulation pumps of the low temperature system and low temperature system, to judge the failure and abnormality of the device accurately and promptly, to promptly notify the administrator of the abnormality, and to immediately repair or repair the device. .

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a heat pump hot water supply apparatus according to the present invention, FIG. 2 is a flow chart showing control for detecting abnormality of a high temperature system circulation pump, and FIG. 3 is a low temperature system circulation system. Flow chart showing the control for detecting the abnormality of the pump, Fig. 4 is a graph showing the prediction data by the simulation of the inlet temperature and the outlet temperature of each heat pump during normal operation, and Fig. 5 shows the high temperature hot water circulation pump. Fig. 6 is a graph showing the prediction data by the simulation of the inlet temperature and the outlet temperature of the high temperature side heat pump at the time of abnormality, and Fig. 6 shows the prediction data by the simulation of the inlet temperature and the outlet temperature of the low temperature side heat pump when the low temperature system hot water circulation pump is abnormal. The graph shown in FIG. 7 is a block diagram of a conventional apparatus. 21,28 …… Hot water tank, 22,29 …… Heat pump, 27,31,44…
… Hot water circulation pump, 34,35,36,37a, 37b, 38a, 38b …… Temperature sensor, 39 …… Fault diagnosis section, 40 …… Display section, 41 …… Print section, 47 …… Memory.

Claims (2)

[Claims] 1. A high temperature side hot water storage tank for storing high temperature water for hot water supply, a high temperature side heat pump for circulating and heating high temperature water, and a forward pipe for connecting the lower and upper parts of the high temperature side hot water storage tank to the high temperature side heat pump, respectively. And return piping, short-circuit piping that connects the forward piping and return piping and bypasses the high-temperature side heat pump, and a three-way motorized valve that connects the forward piping and short-circuit piping to control the inlet temperature of the high-temperature side heat pump, and the three-way A sensor that controls the motor-operated valve, a high-temperature hot water circulation pump installed between the three-way motor-operated valve and the high-temperature heat pump on the way of the outward piping, a low-temperature hot water storage tank that stores low-temperature water, and low-temperature water circulation heating Low temperature side heat pump, forward and return pipes connecting the lower part of the low temperature side hot water storage tank to the low temperature side heat pump, low temperature hot water circulation pump installed in the middle of the forward line, and high temperature side hot water storage When the temperature inside the hot water supply pipe is detected and the temperature is lower than the set temperature, it is installed in the middle of the hot water supply pipe and the hot water supply pipe that supplies hot water from the high temperature side hot water storage tank In a heat pump water heater provided with a hot water circulation pump having a control device that circulates the high temperature water in the high temperature side hot water storage tank and controls so as to keep the temperature in the hot water supply pipe constant, the hot water supplied from the high temperature side hot water storage tank A temperature sensor that detects the temperature, a temperature sensor that detects the temperature inside the low temperature side hot water storage tank, a temperature sensor that detects the temperature inside the hot water supply pipe, and a temperature sensor that detects the inlet temperature and the outlet temperature of the high temperature side heat pump. , A temperature sensor for detecting the inlet temperature and the outlet temperature of the low temperature side heat pump respectively, and a detection value from the temperature sensor is input to a failure diagnosis program stored in advance in the memory. A failure diagnosis section for further failure diagnosis and a display output section for displaying the result of failure diagnosis and issuing an alarm in the event of an abnormality are provided, and the failure diagnosis section is provided with the inlet / outlet temperature calculated by the temperature sensor of the inlet / outlet temperature of the high temperature side heat pump. A heat pump water heater, which determines that the hot water circulation pump of the high temperature system is out of order when the difference is higher than the set temperature and there is no abnormality in other temperature data. 2. A high temperature side hot water storage tank for storing high temperature water for hot water supply, a high temperature side heat pump for circulating and heating high temperature water, and a forward pipe for connecting the lower and upper parts of the high temperature side hot water storage tank to the high temperature side heat pump, respectively. And return piping, short-circuit piping that connects the forward piping and return piping and bypasses the high-temperature side heat pump, and a three-way motorized valve that connects the forward piping and short-circuit piping to control the inlet temperature of the high-temperature side heat pump, and the three-way A sensor that controls the motor-operated valve, a high-temperature hot water circulation pump installed between the three-way motor-operated valve and the high-temperature heat pump on the way of the outward piping, a low-temperature hot water storage tank that stores low-temperature water, and low-temperature water circulation heating Low temperature side heat pump, the forward and return pipes connecting the lower part of the low temperature side hot water storage tank to the low temperature side heat pump, the low temperature hot water circulation pump installed in the middle of the forward pipe, and the high temperature side storage pump. Pipes that connect the lower part of the tank and the upper part of the low temperature side hot water storage tank, the hot water supply piping that supplies hot water from the high temperature side hot water storage tank, and the middle of the hot water supply piping are provided to detect the temperature inside the hot water supply piping and the temperature is lower than the set temperature. In this case, in a heat pump hot water supply device provided with a hot water circulation pump having a control device that circulates high temperature water in the high temperature side hot water storage tank and controls so as to keep the temperature in the hot water supply pipe constant, hot water is supplied from the high temperature side hot water storage tank. Temperature sensor to detect hot water temperature, temperature sensor to detect temperature inside low temperature side hot water storage tank, temperature sensor to detect temperature inside hot water supply pipe, temperature sensor to detect inlet temperature and outlet temperature of high temperature side heat pump respectively And a temperature sensor for detecting the inlet temperature and the outlet temperature of the low-temperature side heat pump, and a failure diagnosis program pre-stored in the memory by inputting detection values from the temperature sensor. A failure diagnosis section for further failure diagnosis and a display output section for displaying the result of failure diagnosis and issuing an alarm in the event of an abnormality are provided.The failure diagnosis section is provided with the inlet / outlet temperature calculated by the temperature sensor of the inlet / outlet temperature of the low temperature side heat pump. A heat pump hot water supply device, characterized in that when the difference becomes higher than a set temperature and there is no abnormality in other temperature data, the hot water circulation pump of the low temperature system is determined to be out of order.