JP2000248987A - Engine heat pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To select the display or non-display of an alarm such as necessity of maintenance adapted to the service system in the area in which an engine heat pump is arranged by recognizing the power source frequency of commercial power source. SOLUTION: An engine heat pump for performing cooling and heating by a coolant pressurized by a compressor, driven by an engine comprises a detecting device for detecting the power source frequency of commercial power source to decide whether or not the detected frequency conforms to a preset power source frequency. It also comprises a mechanism for judging whether an alarm display by an alarm display device is performed or not on the basis of the decision result. According to this, the necessity of maintenance of the engine heat pump is discriminated according to the condition by engine speed and throttle opening, the coition by the integrated total rotating speed, and the condition by filling quantity of lubricating oil, and the area is also recognized from the power source frequency of commercial power source, so that an alarm display adapted to the service system of this area can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an engine heat pump comprising an engine and a compressor refrigerant circuit driven by the engine.

[0002]

2. Description of the Related Art In an engine heat pump composed of an engine and a compressor refrigerant circuit driven by the engine, in order to maintain and improve the durability and reliability of the engine heat pump, appropriate maintenance must be performed at an appropriate time. There is a need to do. Therefore, conventionally, the total operation time and the total number of startups of the engine heat pump are detected and integrated, and the maintenance timing and maintenance contents of the engine heat pump are determined based on the integrated value. Also, as a technology to determine when to change the engine oil,
As disclosed in Japanese Patent Application Laid-Open No. 56-133658, there is described a technique for judging an appropriate engine oil replacement time according to the relationship between the oil temperature and the time during which the oil temperature is maintained, that is, the operating conditions of the equipment. ing. In addition, since different companies perform maintenance in different regions, and different companies have different demands for maintenance such as a display form of an alarm, it is required to match a display form of the alarm with a service form of each company. For this reason, it was necessary to configure an engine heat pump tailored to the contractor in each region.

[0003]

However, as described above, when the maintenance time of the engine heat pump is determined only by macro data such as the total operation time and the total number of starts, the maintenance time is excessively biased toward the safe side. However, maintenance is performed at a time when it is not actually necessary, and the number of maintenances increases, which hinders smooth operation of the engine heat pump and increases labor and cost. In addition, in engine heat pumps, it is necessary to appropriately determine not only the above-mentioned engine oil replacement time, but also the maintenance time of various components such as the spark plug, the tappet clearance of the engine intake / exhaust valve, the compressor refrigerant circuit, and the starter motor. There is. Further, since the engine heat pump is configured to correspond to the service provider in each region, there are problems that the assembling is troublesome and the cost is high. The present invention solves the above problems.

[0004]

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described. According to claim 1, an engine heat pump for cooling and heating with a refrigerant pressurized by a compressor driven by an engine, wherein a detecting means 71 for detecting a power supply frequency of a commercial power supply 70 is provided. Means for judging whether the detected power supply frequency is the same as a preset power supply frequency, and for judging whether or not to display an alarm by the alarm display device 20 based on the judgment result It is.

[0005] In the second aspect, the alarm display device 2
If the setting for performing alarm display by 0, an engine heat pump according to claim 1, wherein an alarm display when it becomes a set value which is the total operating time of the engine heat pump.

In the third aspect, the alarm display device 2
2. The engine heat pump according to claim 1, wherein the alarm display is performed when the total operation speed of the engine heat pump reaches a certain set value when the alarm display is set to 0.

According to a fourth aspect of the present invention, in determining the total operating speed, each operating speed is multiplied by a weighting coefficient based on the ratio of each operating speed to a certain reference speed to thereby determine each operating speed. 4. The engine heat pump according to claim 3, wherein the total operation rotation speed is calculated by converting the rotation speed into a rotation speed.

[0008] In the fifth aspect, the alarm display device 2
In a configuration in which a separate lubricating oil tank is disposed when the alarm display is set to 0, a warning is displayed when the amount of oil supplied from the separate lubricating oil tank to the oil pan reaches a certain set value. Item 10. An engine heat pump according to item 1.

[0009]

Next, an embodiment of the present invention will be described. 1 is a perspective view showing an engine heat pump device of the present invention, FIG. 2 is a front view thereof, FIG. 3 is a plan view thereof, FIG. 4 is a diagram showing a refrigerant circuit of the engine heat pump device, and FIG. FIGS. 6 and 7 are schematic diagrams showing an engine heat pump system having the same engine heat pump control device, FIG. 7 is a diagram showing a method for allocating zones of the engine speed and the throttle opening, and FIG. FIG. 9 is a diagram showing a load factor depending on the engine rotation speed, FIG. 10 is a schematic diagram showing a configuration of a power supply frequency detecting means and a display device, FIG. 11 is a diagram showing a flowchart of power supply frequency detection, and FIG.
2 is a schematic diagram showing a circuit for detecting a power supply frequency, FIG.
FIG. 3 is a schematic diagram showing an example of a method for detecting a power supply frequency.

First, a schematic configuration of a refrigerant circuit of an engine heat pump device according to the present invention will be described with reference to FIGS. The package 4 of the engine heat pump device is divided into upper and lower parts, a heat exchange chamber 1 is disposed above, and an engine room 2 is disposed below. Here, heat exchange room 1
Is a room through which outside air can flow for heat exchange, and the engine room 2 is in a substantially sealed state that is connected to the outside only through an intake pipe or an exhaust pipe.

In the engine room 2, an engine 3, a compressor 7, an accumulator 16, and the like are installed. The engine 3 is provided with an intake silencer 8, an exhaust silencer 9, and the like. An oil pan 5 and an auxiliary oil pan 6 communicating with the oil pan 5 are arranged near the bottom of the engine 3 as an oil pan for storing the lubricating oil of the engine 3. In addition, an electric box 11, in which electric members such as a control device are stored, a liquid receiver 13, a refrigerant circuit 12, and the like are installed.
And an oil tank 10 that is provided separately and stores lubricating oil.

The oil tank 10 and the auxiliary oil pan 6 are connected to each other, and the lubricating oil stored in the oil tank 10 is replenished to the auxiliary oil pan 6 by a lubricating oil pump 18 interposed in the middle of the connection. It is configured to be.
The lubricating oil pump 18 is mounted on the ceiling surface 2 in the engine room 2.
a. Further, on the ceiling surface of the heat exchange chamber 1 above the engine room 2, there are provided fans 15 for heat radiation.
The exhaust port 14 is opened, and the exhaust from the engine 3 after passing through the exhaust silencer 9 is discharged from the exhaust port 14 to the outside.

The flow of the refrigerant circuit 12 of the engine heat pump apparatus configured as described above, for example, the flow during heating will be described with reference to FIG. First, the compressor 7 is driven by the engine 3 to change the refrigerant into a high-temperature and high-pressure superheated vapor state, and the oil separator 21 separates oil mixed in the refrigerant. The high-temperature and high-pressure superheated steam after separating the oil is guided to the indoor heat exchanger 23 by the four-way valve 119 switched to the heating direction. The heat is released from the refrigerant in the indoor heat exchanger 23, and the refrigerant changes from a high-temperature high-pressure superheated vapor state to a high-pressure liquid state. The released heat heats the room.

The refrigerant in the high-pressure liquid state is a liquid receiver 1
After passing through No. 3, the gas rapidly expands at the expansion valve 24 to be in a low-temperature and low-pressure steam state, and while passing through the outdoor heat exchanger 22, heat is obtained from outside air to be superheated steam. The superheated refrigerant returns to the accumulator 16, becomes a complete vapor phase, is again guided to the compressor 7, and thereafter repeats the same cycle. During cooling, the refrigerant flows from the four-way valve 19 to the outdoor heat exchanger 22, the liquid receiver 13, the expansion valve 24, the indoor heat exchanger 23, and the four-way valve 19 in this order. On the other hand, the cooling water of the engine 3 is circulated in the cooling water circuit 20 by the pump 29, and the cooling water having a high temperature in the engine 3 is cooled by the radiator 26.

If the refrigerant returning to the accumulator 16 is not sufficiently vaporized in the refrigerant circuit 12, the three-way valve 28 is switched to guide the high-temperature cooling water to the auxiliary refrigerant evaporator 25, It is configured to give heat to the refrigerant. Further, a thermostat 27 is provided in the cooling water circuit 20 so that when the temperature of the cooling water is not so high and cooling is not necessary, the cooling water returns directly to the engine 3 without passing through the radiator 26. ing.
Note that an exhaust gas heat exchanger 19 is provided in the cooling water circuit 20 to exchange heat with exhaust gas from the engine 3.

Next, a lubricating oil supply device of the engine heat pump device will be described. As shown in FIG. 5, the oil pan 5 and the auxiliary oil pan 6 communicating with the oil pan 5 are provided near the bottom of the engine 3 as described above, and are separate from the oil pan 5 and the auxiliary oil pan 6. An oil tank 10 is provided. Oil tank 1
0 and the auxiliary oil pan 6 are connected by a lubricating oil supply pipe 141 and can communicate with each other.

A pump 18 as a lubricating oil supply device is interposed in the middle of the lubricating oil supply pipe 141, and the lubricating oil stored in the oil tank 10 is assisted by driving the pump 18. The oil pan 6 is configured to be replenished. The pump 18 uses a trochoid pump and is driven by, for example, an electric motor. And
The pump 18 is arranged above the upper end surface of the oil tank 10.

A check valve 131 is provided on the discharge side 18a (the auxiliary oil pan 6 side) of the pump 18 to prevent backflow of lubricating oil from the auxiliary oil pan 6 to the oil tank 10 side, and to stop the pump 18 Sometimes, lubricating oil is prevented from being sucked from the oil tank 10 into the auxiliary oil pan 6. In addition, a filter 132 is provided on the suction side 18b (oil tank 10 side) of the pump 18 to prevent foreign substances mixed in the lubricating oil from entering the pump 18 and the check valve 131. The reliability of the supply device has been improved.

The filter 1 of the lubricating oil supply pipe 141
A three-way valve 136 is interposed on the oil tank 10 side of the three-way valve 32. One end of the three-way valve 136 is
The other end of the maintenance pipe 142 inserted inside is connected. Further, the check valve 131 of the lubricating oil supply pipe 141
A three-way valve 137 is interposed on the auxiliary oil pan 6 side, and one end of a drain pipe 143 is connected to the three-way valve 137.

The auxiliary oil pan 6 is provided with a float switch 134 for detecting the oil level of the lubricating oil in the oil pan 5 and the auxiliary oil pan 6 and inputting an oil level signal to the control unit 135. It is configured as follows. When the lubricating oil in the oil pan 5 and the auxiliary oil pan 6 decreases, the control device 135 detects a decrease in the oil level based on the oil level signal input from the float switch 134 and A drive signal is sent to drive the oil pump 10, and the pump 18 is driven to supply lubricating oil from the oil tank 10 to the auxiliary oil pan 6. further,
When lubricating oil is supplied to the auxiliary oil pan 6 and the oil level in the auxiliary oil pan 6 rises to a certain level, the control device 1
A pump stop signal is sent from 35, and the pump 18 is stopped to stop supplying the lubricating oil.

In the lubricating oil supply device constructed as described above, since the pump 18 is disposed above the upper end surface of the oil tank 10, the oil tank 10 is supplied by the pump 18 only when lubricating oil is supplied. Lubricating oil is sucked upward. Therefore, the lubricating oil in the oil tank 10 does not flow out even when the pump 18 is stopped or when the seal portion of the pump 18 is deteriorated or damaged.

Further, as shown in FIG. 5, in the engine heat pump device, in order to extract gas accumulated in the oil pan 5 to the outside of the oil pan 5, the oil pan 5 is provided with a vent pipe 138, 3 is connected to the intake port 3a. The gas accumulated in the oil pan 5 is sucked into the intake port 3a after the oil is separated by the oil separator 133, and the oil separated by the oil separator 133 is returned to the oil pan 5 through the return pipe 139. I have. With this configuration, the inside of the oil pan 5 and the inside of the auxiliary oil pan 6 are in a negative pressure state during the intake stroke of the engine 3. Further, a slight gap is formed in the pump 18 for communicating the auxiliary oil pan 6 and the oil tank 10. Therefore, when the auxiliary oil pan 6 and the oil tank 10 are in communication with each other, the lubricating oil in the oil tank 10 is sucked toward the auxiliary oil pan 6 even when the pump 18 is stopped, and the oil level is reduced. Lubricating oil is supplied in excess of the allowable upper limit, which may cause problems such as oil tapping and leakage of lubricating oil.

However, in the present engine heat pump device, the check valve 13 is provided on the discharge side 18a of the pump 18.
When the discharge pressure of the pump 18 is not applied, the communication between the auxiliary oil pan 6 and the oil tank 10 by the gap in the pump 18 is checked by the check valve 131.
It is constituted so that it may be closed. Thereby, the pump 1
Preventing the lubricating oil in the oil tank 10 from being sucked into the auxiliary oil pan 6 when the engine 8 is stopped, thereby preventing excessive supply of the lubricating oil to the oil pan 5 and the auxiliary oil pan 6. Can be.

Next, the overall structure of the engine heat pump control device of the present invention will be described with reference to FIG. The engine heat pump system includes a rotation sensor 31 for detecting an engine speed, a discharge pressure sensor 32 for detecting a discharge pressure of a compressor, a discharge temperature sensor 33 for detecting a discharge temperature of a compressor, an operation time, a throttle opening, There is provided a detecting means including various sensors for detecting the starter motor energizing time, the number of times the starter motor is energized, and the like. These operation data are detected by the detection means, and the detected operation data is input to the input means A
Via a / D converter 34 and a counter circuit 35,
It is input to a microcomputer 36 which is a calculating means.

In the microcomputer 36,
Each of the input operation data is subjected to arithmetic processing, the data is allocated to a predetermined zone, and stored in the nonvolatile memory 37 as storage means. The microcomputer 36 reads out various data stored in the non-volatile memory 37 as necessary, and reads the data by the display 38 as display means or the communication circuit 3 as communication means.
The display device 40 is an external display device via the display device 9.

Next, an arithmetic processing method by the microcomputer 36 of various data detected by the detecting means,
The method for determining the maintenance time will be described. First, a method of assigning the engine speed and the throttle opening to predetermined zones will be described with reference to FIGS. The detected values of the engine speed and the throttle opening detected by the detecting means are provided at regular intervals a.
The average value within that time is calculated. As shown in FIGS. 7 and 8, the calculated average value of the engine speed is calculated based on a plurality of operating speed zones 3 divided in advance for each value within a certain range.
It is determined to which of 3a, 33b, 33c,.
.. Are accumulated for a certain period of time. For example, a certain time a
If it is determined that the average value of the engine rotation speeds within the operation speed zone 33a belongs to the operation rotation speed zone 33a, the accumulated time T of the operation rotation speed zone 33a becomes T
= (Constant time a) × 12. In this way, the operation time in each of the operation speed zones 33a, 33b, and 33c is accumulated.

Next, a method of integrating the engine speed will be described with reference to FIG. In order to determine the maintenance time, the engine speed is detected and multiplied by a weighting factor based on the ratio between each operating speed and a certain reference speed.
The total number of rotations is calculated by converting to a certain number of rotations. That is,
The engine speed is multiplied by a coefficient to convert it to a reference speed,
An alarm can be displayed when the sum of the reference rotation speeds becomes equal to or more than a certain value. An example of a method for calculating the engine speed to the reference speed in the present invention will be described. The rotation speed of the engine is detected by a rotation sensor 31 serving as a detecting means. The number of revolutions of the engine is detected for each unit time, and the number of revolutions of the engine is integrated by the arithmetic processing by the microcomputer 36.
Although it is possible to simply add the engine speeds to obtain the sum of the going speeds, in the present embodiment, in order to more accurately recognize the load applied to the engine, the engine speed is changed according to the engine speed. This is multiplied by the load coefficient (load factor), converted to a certain reference speed, and the total reference speed is integrated. That is, each operation speed detected and integrated for each unit time is compared with a reference speed in a unit time at a certain reference speed, and according to a ratio between each operation speed and the reference speed, By multiplying each operating speed by the load coefficient (load factor), which is a weighting factor, the operating speed is converted into a certain reference speed to calculate the total speed. The load factor corresponding to each rotational speed or the load factor as a function of the rotational speed may be stored in the above-described nonvolatile memory 37 and provided at the time of the arithmetic processing of the microcomputer 36.

In the embodiment shown here, the number of revolutions of the engine is integrated based on a certain rotational speed r1 of the engine. For the rotation speed r other than the rotation speed r1, the load ratio α (r) corresponding to the rotation speed r is multiplied by the rotation speed rt at the rotation speed r, and the rotation speed S
r is calculated. That is, the rotational speed Sr considering the load
Is obtained by the following equation. Sr = α (r) · rt (0 <r <r1, r1 <r) Sr = rt · (r = r1) where t is a unit time. Then, the rotation speed Sr is added for each unit time, and the total of the rotation speeds is calculated. The load factor α (r) changes according to the characteristics of the corresponding engine, and the load factor α (r) can be set according to the rotation speed corresponding to each engine. Also, considering the running-in operation and warm-up operation of the engine, the reference rotational speed r
1 may be changed according to the total number of rotations.

The load applied to the engine varies depending on the engine speed due to the intake structure, the exhaust structure, the cylinder shape, the inertia force of the piste, and the like. That is, as shown in FIG. 9, the load differs with respect to the rotation speed of the engine. Therefore, as described above, by calculating the engine load at another rotation speed based on the engine load at a specific rotation speed, a detailed engine load state can be recognized. Further, since the load of the engine can be integrated by the number of revolutions, the load of the engine can be easily recognized.

Further, as the reference rotational speed r1, a rotational speed with the smallest load can be selected as in this embodiment. However, it is possible to calculate the load factor of the engine at other rotation speeds based on the other rotation speeds and use it for integrating the engine speed. The calculation method of the load factor α (r) and the rotation speed Sr shown in the present embodiment is an example, and does not limit what is intended by the present invention. The intent of the inventor is to recognize the degree of fatigue of the engine by multiplying the number of rotations by a load factor corresponding to the rotation speed of the engine and determine the maintenance time. Therefore, a function of the load factor different from the curve of the load factor α (r) shown in FIG. 9 is obtained depending on which part of the engine is emphasized and the load factor is determined. Further, the load factor of the engine can be made to correspond to the sum of the engine speed and the engine speed.

Further, it is also possible to calculate the load of the engine from the amount of oil sent to the oil pan, and display an alarm when the load reaches a certain value or more. When the lubricating oil in the oil pan 5 and the auxiliary oil pan 6 decreases in the lubricating oil replenishing mechanism shown in FIG.
By 35, a decrease in the oil level is detected based on the oil level signal input from the float switch 134. Then, a drive signal for driving the pump 18 is sent out by the control device 135, and the pump 18 is driven to drive the oil tank 1
The lubricating oil is supplied from 0 to the auxiliary oil pan 6. Further, lubricating oil is supplied to the auxiliary oil pan 6,
When the oil level in the auxiliary oil pan 6 rises to a certain height, a pump stop signal is sent from the control device 135,
The configuration is such that the pump 18 stops and the supply of the lubricating oil ends. That is, when the oil level is detected by the float switch 134, a certain amount of lubricating oil is supplied from the oil tank 10 to the auxiliary oil pan 6.

The lubricating oil is supplied to each part of the engine and serves to reduce friction, and the engine load can be recognized from the consumption of the lubricating oil. That is, when the consumption of the lubricating oil is large, it can be considered that the load on the engine is large. If the consumption of the lubricating oil is abnormally high, a problem has occurred in some part of the engine, and it is considered that maintenance is necessary. That is, it is possible to determine the fatigue of the oil seal, the wear of the piston ring, the wear of the valve guide, and the like.

In this embodiment, the maintenance load can be determined by judging the load of the engine based on the consumption of the lubricating oil. As described above, the pump 18 inputs the number of times of operation of the pump 18 to the microcomputer 36 so as to replenish a certain amount of lubricating oil every time the pump 18 is operated by the control device 135. The total supply amount and the consumption speed of the engine oil can be recognized. That is, the load of the engine is determined based on the number of operations of the pump 18, and if the number of operations exceeds a certain value, or if the number of operations exceeds a certain value within a certain period, it is determined that maintenance is necessary. , An alarm display is provided on a display device such as a display unit of an operation remote controller of the indoor unit.

Thus, maintenance can be performed in accordance with consumption of the lubricating oil, and at the same time, problems such as fatigue of the oil seal, wear of the piston ring, and wear of the valve guide can be recognized. Further, the amount of lubricating oil supplied is calculated from the number of times or the operating time of the pump 18, and when the amount of lubricating oil reaches a predetermined constant value, the condition for determining the necessity of maintenance and can do. That is, by monitoring the lubricating oil replenishing mechanism or the lubricating oil replenishing amount, it is possible to recognize the load on the engine and the occurrence of trouble, and to judge the necessity of maintenance.

Further, the engine heat pump is provided with a means for determining the frequency of the power supply, and the presence / absence of an alarm display can be set by the determining means. FIG. 10 shows an example of the configuration of the frequency determining means of the power supply. The engine heat pump is provided with a power supply frequency detection means 71 and a determination unit 72, and the power supply frequency detection means 71 and the determination unit 72 are electrically connected. The determination unit 72 is connected to the display device 20. In this embodiment, the determination unit 72 can be constituted by the microcomputer 36 described above.

The engine heat pump is configured to be connectable to a commercial power supply 70, and is configured to be able to supply power to some electrical components of the engine heat pump from the commercial power supply. The power supply frequency detecting means 71 is connected to the commercial power supply 70, and is configured to recognize the power supply frequency of the commercial power supply 70. Power frequency detection means 7
The determination of the power supply frequency in the determination unit 7 is based on the electric signal.
2 is transmitted. In the determination section 72, display and non-display of an alarm are determined according to the flowchart shown in FIG.

First, the power supply frequency is detected by the power supply frequency detecting means 71, and it is determined whether or not the detected power supply frequency is a preset power supply frequency. When the detected power supply frequency is the set frequency, a warning display is determined. However, if the frequency is not the set frequency, it is determined that the alarm is not displayed. That is, a predetermined frequency is set in advance, and when the power supply frequency for supplying power to the engine heat pump is that frequency, an alarm can be displayed. In this way, warnings are displayed for users in a certain area where the set power frequency is supplied, and warnings are not displayed for users in areas where other power frequencies are supplied. It is possible to perform an alarm display corresponding to the service form even in an area where the service form is different.

Next, means for recognizing the power supply frequency will be described. A commercial power supply is connected to the circuit 80 shown in FIG.
The circuit 80 is configured to be able to recognize the instant of the voltage 0 of the commercial power supply. The circuit 80 is composed of circuits 80a and 80b each having a rectifier, and is configured to pass current only to one of the terminals c to d or d to c. That is, the circuit 80a and the circuit 80
It is possible to recognize which of the potentials of the terminal c and the terminal d is higher depending on which of b flows the current. Circuit 8
If no current is flowing to either Oa or the circuit 80b, it is recognized that there is no potential difference between the terminals c and d. Thus, a change in the potential of the commercial power supply can be easily recognized by using the circuit 80.

Further, a timer is operated from the point in time when the voltage value of the AC voltage of the commercial power supply becomes 0, and the voltage of the power supply is measured after a certain period of time after the operation of the timer. You can know. For example, a case where the power supply frequencies of 50 Hz and 60 Hz are identified will be described. As shown in FIG. 13, in the voltage change between the terminal c and the terminal d, when the potential difference of the potential of the terminal d with respect to the potential of the terminal c becomes zero from negative by the circuit 80, the timer operates, A potential difference between the terminal c and the terminal d after a certain time is detected. 50Hz and 6
To identify the power frequency of 0 Hz, set the timer to 1
11 / 1200s which is between / 100s and 1 / 120s
Can be identified by setting In the present embodiment, the time of the timer is not limited to 11/1200 s as long as the time can identify the power supply frequency of 50 Hz and 60 Hz. That is, the power supply frequency is 60H
If it is z, it is 1 from the time when the timer is activated.
After / 120 s, the voltage difference becomes 0 from the positive. When the frequency is 50 Hz, the voltage difference becomes 0 after 1/100 s. Therefore, by measuring the sign of the voltage difference near 11/1200 s, which is between 1/120 s and 1/100 s, it is possible to determine whether the power supply connected to the circuit 80 is 50 Hz or 60 Hz. Can be. still,
Even when the operation of the timer is started when the potential difference becomes 0 from positive, the power supply frequency can be similarly identified.

The power supply frequency of the commercial power supply can be easily determined by the above method, and by determining the frequency of the commercial power supply, the area where the engine heat pump is provided can be recognized. Accordingly, it is possible to select whether to display or not to display a warning indicating the necessity of maintenance or the like in accordance with a service system in a region where the engine heat pump is provided. That is, the necessity of maintenance of the engine heat pump can be determined based on the conditions based on the engine speed and the throttle opening, the conditions based on the total amount of the engine speed, and the conditions based on the replenishment amount of the lubricating oil. It is possible to recognize an area based on the power supply frequency and perform an alarm display in accordance with the service system of the area.

[0041]

As described above, the present invention has the following advantages. As described in claim 1, in the alarm display device of the engine heat pump which performs cooling and heating by the refrigerant pressurized by the compressor driven by the engine, the power supply frequency of the commercial power supply 70 can be recognized by the power supply frequency detecting means 71. The area where the engine heat pump is provided can be recognized within a certain range. Accordingly, it is possible to select whether to display or not to display a warning indicating the necessity of maintenance or the like in accordance with a service system in a region where the engine heat pump is provided.
That is, the presence or absence of the alarm display can be automatically set according to the power supply frequency. Therefore, a single engine heat pump can cope with an area having a different service system.

According to a second aspect of the present invention, in the alarm display device, when an alarm display is set, an alarm is displayed when the total operation time of the engine heat pump reaches a certain set value. Can be quantitatively grasped. In addition, the maintenance time and maintenance content of the engine heat pump could be properly determined. As a result, the durability and reliability were improved while the engine heat pump system was smoothly operated without excessive maintenance.

According to a third aspect of the present invention, in the alarm display device, when an alarm display is set, the alarm display is performed when the total operating speed of the engine heat pump reaches a certain set value. Individual load status can be grasped quantitatively, maintenance time,
And the maintenance contents could be determined appropriately.
As a result, the durability and reliability were improved while the engine heat pump system was smoothly operated without excessive maintenance. Further, since the maintenance time of the engine is determined from the engine rotation speed, it can be realized by an easy configuration such as using an ignition coil of the engine.

According to a fourth aspect of the present invention, in determining the total operating speed, each operating speed is multiplied by a weighting coefficient based on a ratio of each operating speed to a certain reference speed, so that each operating speed is calculated. Since the total operation speed is calculated by converting to a certain reference speed, the individual load status of the engine heat pump can be quantitatively grasped, and the maintenance time and maintenance contents can be appropriately determined. . As a result, the durability and reliability were improved while the engine heat pump system was smoothly operated without excessive maintenance. Further, it is possible to determine the maintenance time in consideration of the accumulation of carbon due to low-speed operation of the engine and the fatigue of each part caused by the inertial force of each part of the engine caused by the high rotation.

According to a fifth aspect of the present invention, when there is a separate lubricating oil tank, an alarm is displayed when the amount of oil supplied from the separate lubricating oil tank to the oil pan reaches a certain set value. The individual load status of the heat pump could be quantitatively grasped, and the maintenance time and maintenance content could be appropriately determined. As a result, the durability and reliability were improved while the engine heat pump system was smoothly operated without excessive maintenance. Further, it is possible to recognize the maintenance time corresponding to the settling of the oil seal of the engine, the wear of the piston ring, the wear of the valve guide, and the like. For this reason,
Maintenance can be performed in advance, and the durability of the engine heat pump can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an engine heat pump device.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a diagram showing a refrigerant circuit of the engine heat pump device.

FIG. 5 is a diagram showing a lubricating oil supply device.

FIG. 6 is a schematic diagram showing an engine heat pump system including the engine heat pump control device.

FIG. 7 is a diagram showing a method for distributing zones of an engine speed and a throttle opening.

FIG. 8 is a diagram showing a flowchart of the distribution of zones of the engine speed.

FIG. 9 is a diagram showing a load ratio according to an engine rotation speed.

FIG. 10 is a schematic diagram illustrating a configuration of a power supply frequency detecting unit and a display device.

FIG. 11 is a diagram showing a flowchart of power supply frequency detection.

FIG. 12 is a schematic diagram showing a circuit for power supply frequency detection.

FIG. 13 is a schematic diagram illustrating an example of a method for power supply frequency detection.

[Description of Signs] 23a / 23b / 23c Operating Revolution Zone 71 Power Frequency Detection Means 72 Judgment Unit 80 Circuit

Claims (5)

[Claims] An engine heat pump for cooling and heating with a refrigerant pressurized by a compressor driven by an engine, wherein the detecting means detects a power frequency of a commercial power supply.
1 to determine whether or not the power supply frequency detected by the power supply frequency detection means 71 is the same as a preset power supply frequency, and display an alarm by the alarm display device 20 based on the determination result. An engine heat pump provided with a means for determining whether the engine is operating. 2. The engine according to claim 1, wherein when the alarm display device is set to display an alarm, the alarm display is performed when the total operation time of the engine heat pump reaches a certain set value. heat pump. 3. The alarm display device according to claim 1, wherein when an alarm display is set by the alarm display device, the alarm display is performed when a total operating speed of the engine heat pump reaches a certain set value. Engine heat pump. 4. When determining the total operation speed, each operation speed is converted into a certain reference speed by multiplying each operation speed by a weighting coefficient based on a ratio of each operation speed to a certain reference speed. 4. The engine heat pump according to claim 3, wherein the total operation speed is calculated. 5. In a configuration in which a separate lubricating oil tank is disposed when the alarm display is performed by the alarm display device 20, a set value at which the amount of oil supplied from the separate lubricating oil tank to the oil pan is set. 2. The engine heat pump according to claim 1, wherein an alarm display is provided when the engine is turned off.