JPS5989957A - Heat pump device driven by engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an engine-driven heat pump machine that performs air conditioning and heating by driving a compressor using an internal combustion engine that uses natural gas or gasoline as a heat source.

Conventional configurations and their problems Recently, conventional electric motors have been developed as a means of effectively utilizing primary energy and solving the difficulties of constructing new power plants and the peak demand for electricity in the summer. Engine-driven heat pump devices that perform cooling/heating or hot water heating operations by rotating a refrigerant compressor driven by an engine instead of a driven refrigerant compressor are attracting attention.

This engine-driven heat pump device converts fuel such as natural gas or gasoline into power using the engine and drives the compressor to operate the heat pump.The engine also recovers exhaust heat from the engine and uses it for space heating and hot water supply. It is characterized by extremely high efficiency based on energy standards.

When using this type of engine-driven heat pump device for home or commercial use, the important points are that the engine must be reliably started and that the durability of the compressor be improved. Normally, a starter motor is used to start the engine, but the capacity of this starter motor is 3.
A horsepower engine requires an electrical capacity of about 600 to soow, which uses valuable electrical energy, and the peak current flows several times the rated current at startup, so the starter motor should be as small as possible in terms of electrical equipment capacity. is desirable. However, in order to prevent engine vibrations and absorb shaft torque fluctuations, the engine is provided with a flywheel having a large moment of inertia, which has the disadvantage that the starter motor for starting the engine becomes too large. Furthermore, in the case of a normal engine-driven heat pump device, unlike conventional car coolers, etc., when starting the engine, the compressor is usually started at the same time in order to speed up the start-up of heating and cooling. The starting load on the engine and compressor increased, and the capacity of the starter motor had to be increased. However, in the case of an engine-driven heat pump, it is necessary to start the machine reliably even when the outside temperature is below freezing. In that case, the viscosity of the oil sealed in the engine and compressor increases, making it difficult to start the starter motor, and causing the engine to stall. The problem was that it was difficult to remove.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional problems.
The purpose of this is to energize the starter motor to start the engine, but after a time delay, energize the electromagnetic clutch and drive the compressor to reduce the load on the starter motor and start the engine. The aim is to reduce the capacity of the motor and make it easier to start the engine.

Structure of the Invention As a structure for this purpose, the present invention connects an engine and a compressor via an electromagnetic clutch to perform the compression.

A heat pump refrigerant circuit driven by the engine is provided, a starter motor is provided to start the engine, and three relay contacts are provided that are turned on by the operation of a thermoswitch that detects the indoor temperature, and the number of rotations of the flywheel of the engine is provided. A rotation speed detector is provided to detect the rotation speed, and a switching contact that turns on when the detected speed of the rotation speed detector reaches a set value or more is provided, and the switching contact, the first contact of the three relay contacts, and the relay of the starter motor are provided. The coils are connected in series to a power source, the second contacts of the relay contacts of the three relays and a timer are connected to the power source in series, and the contacts of this timer, the relay coil of the electromagnetic clutch and the second contact are connected in series. Connect to power,
The relay coil of the engine gas valve is connected to a power source through the third contact of the three relay contacts.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

1 is an engine, 2 is a flywheel attached to the output shaft of the engine 1, and 3 is a starter motor. When energized, a gear 4 pops out and meshes with a gear 2' provided on the outer periphery of the flywheel 2 to start the engine 1. It is what starts it. Reference numeral 5 denotes a rubber joint that absorbs the difference between the output torque of the flywheel 2 and the required torque on the load side. Reference numeral 6 denotes an electromagnetic clutch, which transmits the driving force of the engine 1 to the compressor 7 when energized. A heat pump refrigerant circuit 8 performs heating and cooling by operating the compressor 7. 9 is a base of the engine 1, and 1o is a support spring.

In FIG. 3, the relay coil 11 of the starter motor 3
, the relay coil 12 of the electromagnetic clutch 6, and the relay coil 13 of the gas valve for supplying fuel to the engine 1 are the first contact 16a and the first contact of the three relay contacts operated by the signal of the thermo switch 15 of the indoor electric circuit 14, respectively. 2 contacts 1
6b, and are connected in parallel to the power outlet 17 via the third contact 16C. Reference numeral 18 is a switching contact of the relay coil 2o, which operates the coil 20 and operates the contact 18 to turn off the relay coil 16 for Stark Morph 3 when the rotation speed exceeds the set rotation speed according to the rotation speed detector 19 of the flywheel 2. This is what I did. 21 is a timer, and the contact 22 is closed several seconds after the timer 21 is energized. 23 is an operation switch.

Next, the operation will be explained with reference to FIGS. 2 and 3.

When the operation switch 23 is closed and heating and cooling of the indoor electric circuit 14 of the heat pump refrigerant circuit 8 is requested, the thermo switch 15 is turned on, and the relay contacts 16a and 16b are turned on.
, 16c is turned on.

Also, since the switching contact 18 is a normally closed contact and is turned on, the third
At point A in the figure, the starter motor 3 is energized via the first contact 16a. Further, the timer 21 is energized through the second contact 16b, and the relay coil 13 of the gas valve is energized through the third contact 16c.
energize through.

As a result, the gear 4 of the starter motor 3 and the gear 4 of the flywheel 2 mesh with each other to start the engine 1.

As shown in Fig. 2, the engine rotates 10 times, overcoming the excessive torque immediately after starting and increasing to about 500 rpm. When the rotation speed reaches this speed, the operating current on the starter motor 3 side is already at the rated value, and there is also a margin in terms of torque. Then, at time B, which is a short time t0 later than time A, contact 22 of timer 21 is turned on, energizing relay coil 12 of electromagnetic clutch 6, and compressor 7 and engine 1 are connected. , engine 1 is started while driving, engine 1 starts to ignite, and the engine speed further rises to about 8Q.

Assuming that the engine 1 has been started at a certain rpm, the rotation speed detector 19 energizes the coil 20 at time C to open the switching contact 18 and turn off the relay coil 11 of the starter motor 3. Then, gear 4 of starter motor 3 retracts and disengages from gear 2'. However, since the rod engine 1 has already started igniting, it continues to rotate.
A certain number of revolutions (approximately 100 Orpm in this case)
is maintained and the compressor 7 is driven to perform cooling/heating operation, and the engine 1 continues to rotate until a cooling/heating stop signal from the thermoswitch 15 of the indoor electric circuit 14 is received from the heat pump refrigerant circuit 8 side.

In this way, since the electromagnetic clutch 6 is energized not at the same time as the starter motor 3 but with a slight delay, only the starting load of the engine 1 is applied when the starter motor 3 is started, and the load of the compressor 7 is not applied. As a result, the starting current of the starter 3 is reduced, and the rotation after starting is increased smoothly. At the same time, the outside temperature decreases and the viscosity of the oil in the engine 1 (not shown) and the oil in the compressor T decreases. Even if the engine speed increases, the load torque of the starter motor 3 only needs to be applied to the engine 1 side, so that the engine can be started smoothly.

Effects of the Invention As is clear from the above description, the electromagnetic clutch is not energized at the time of starting the starter motor, so the torque load on the starter motor is only on the engine side and there is no load on the compressor. , the starting current of the starter motor is reduced, and the rotation speed increases smoothly after starting, and even if the outside temperature drops and the viscosity of the lubricating oil in the engine or compressor increases, the starter motor can still be compressed to start. Since it has little to do with the torque load on the machine side, it has an excellent effect of allowing smooth startup.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an engine-driven heat pump device according to an embodiment of the present invention, FIG. 2 is a control circuit diagram of the same, and FIG.
The figure is a timing diagram showing the engine rotation speed, starter motor, and operation of the electromagnetic clutch.

Claims (1)

[Claims] The engine and the compressor are connected via an electromagnetic clutch, a heat pump refrigerant circuit is provided which is driven by the compressor, and a starter motor is provided to start the engine, which is turned on by the operation of a thermoswitch that detects the indoor temperature. a rotation speed detector for detecting the rotation speed of the flywheel of the engine; a switching contact that turns on when the detected speed of the rotation speed detector reaches a set value or more; The first contact of the three relay contacts and the relay coil of the starter motor are connected in series to a power supply, the second contact of the three relays and a timer are connected to a power supply in series, and the timer is connected in series to a power supply. A contact point, a relay coil of the electromagnetic clutch, and the second contact are connected to a power source in series, and a relay coil of a gas valve of the engine is connected to a power source via a third contact of the three relay contacts, and the engine is driven; - topo/p device.