JPS6032837Y2 - Heat pump refrigeration equipment - Google Patents

Description

[Detailed description of the invention] The present invention is a heat pump type refrigeration system, in detail, a defrosting signal is inputted by a de-Icer into an electronic control circuit for each operation of cooling, heating, and defrosting, and the output of the circuit is used to The present invention relates to a heat pump type refrigeration system in which defrosting operation is performed by switching a switching valve to the cooling side.

Conventionally, this type of device generates a defrost signal from an AC power source of, for example, 100V, with a voltage corresponding to the power supply voltage, converts the voltage to DC and reduces the pressure, and combines a light emitting diode and a phototransistor. The voltage is applied to a light emitting diode of a so-called photocoupler, and the phototransistor outputs a weak signal corresponding to a predetermined input voltage of an electronic control circuit, which is then input to the electronic control circuit.

However, when supplying an alternating current defrosting signal to the photocoupler's light emitting diode, there is a problem in that a rectifier circuit and even a smoothing circuit are required to convert it to direct current, making it expensive.Moreover, light emitting diodes are susceptible to overcurrent and reverse Since the withstand voltage is low, if a surge superimposes on the voltage of the AC power supply and enters,
There was a problem in that the photocoupler was damaged due to the intrusion surge.

Therefore, in order to solve this problem, two photocouplers are used, and the output of the first photocoupler is inputted to the second photocoupler.As a result, the photocouplers are connected in two stages to improve insulation resistance and voltage resistance. It is conceivable to improve the insulation performance of the insulator, but not only would this require two photocouplers, which would be expensive, but it would not provide sufficient insulation performance to withstand intruding surges, making it fundamentally unsolvable.

Therefore, the present invention was devised to solve the above problems, and its purpose is to eliminate the need for a rectifier circuit and smoothing circuit to convert an AC defrosting signal to DC, making it inexpensive, and preventing intrusion surges. It is an object of the present invention to provide a heat pump type refrigeration device that can withstand high temperatures, has a long service life, and can reliably input a predetermined defrosting signal to an electronic control circuit.

That is, in the present invention, the defrost signal is transmitted by the de-Icer to the cooling/air conditioner.
A heat pump type refrigeration system is provided in which input is input to an electronic control circuit for each operation of heating and defrosting, and the output of the circuit is used to switch a four-way switching valve to the cooling side to perform defrosting operation, and the switching operation of the de-icer In this way, a neon lamp circuit in which a neon lamp and a protective resistor are connected in series is energized from an AC power supply, and a photoelectric conversion element such as cadmium sulfide is provided opposite to the neon lamp, and a defrosting signal of the element is transmitted. It is characterized in that the information is input to the electronic control circuit.

Embodiments of the device of the present invention will be described below based on the drawings.

In the drawings, A is an outdoor unit, B is an indoor unit, and the outdoor unit A includes a compressor 1, a four-way switching valve 2, an outdoor coil 3 with an outdoor fan installed oppositely, a heating expansion mechanism 4, and a check valve. The indoor unit B has a parallel circuit with a cooling expansion mechanism 8 and a check valve 9, an indoor coil 7 with an indoor fan F2 installed opposite it, and a parallel circuit with a check valve 9. are connected to each other by refrigerant piping 10.

Further, both ends of the refrigerant pipes 6 and 10 of both units A and B are connected by a connecting pipe C9C.

And an electronic control circuit 11 for each operation of cooling, heating, and defrosting.
During cooling, the circuit 11 energizes the four-way switching valve 2 to switch as shown by the solid line to circulate the refrigerant in the direction of the solid line arrow to perform cooling operation, and during heating, the four-way switching valve 2 The road switching valve 2 is de-energized and switched as shown by the dotted line, and the refrigerant is circulated in the direction of the dotted arrow to perform heating operation, and the outdoor coil 3 is provided with a de-isser DS, and during heating,
The de-icer DS inputs a defrosting signal to the electronic control circuit 11, and the output of the circuit 11 energizes the four-way switching valve 2 to switch to the cooling side and perform defrosting operation.

By the way, the electronic control circuit 11 is configured to rapidly control the room temperature to a desired temperature j' without drafts at the start of the cooling/heating operation, and to perform reliable room temperature control corresponding to changes in the cooling/heating load. Using electronic components such as ICs and transistors, the capacity of the compressor 1 is controlled, and the rotational speed of the motor M of the outdoor fan F1 and the motor (not shown) of the indoor fan F2B, as well as the number of rotations of the outdoor fan F1 and the indoor fan F1. It instructs the operator to control the air volume of F2.

That is, as shown in FIG. 2, the electronic control circuit 11 includes a cooling/heating switching relay R1 that is connected in series to the four-way switching valve 2 and has a contact t1 that opens during heating, and a contact of the relay R1 that is connected in parallel to the heating/heating switching relay R1. A defrosting relay R2 having a contact t2 that closes when the defrosting signal is input at the time, a speed tap switching relay R3 for the outdoor fan motor M, a capacity control relay R1 for the compressor 1, and a relay R1 for controlling the indoor fan motor. It is equipped with various relays such as a speed tap switching relay R6, and the opening and closing of the relays are controlled using the electronic components.

Since the electronic control circuit 11 uses electronic components as described above, the power source of the circuit 11 is an AC power source (for example, 100 V).
) is inputted through a step-down transformer T and converted to direct current, thereby making the operating power supply voltage a low voltage of, for example, 3 to 12 VDC.

As shown in FIG. 2, the four-way switching valve 2 and the contact point t1. The series circuit of the parallel circuit of t2 is connected to the series circuit of the outdoor fan motor M, the changeover switch of the relay R2, and the heating side contact t3 of the de-icer DS, and the defrosting signal line 1 is connected to the connection line.
2 is connected to the signal line 12, and a neon lamp circuit 30 having a neon lamp 13 and a protective resistor r1 in series is connected to the signal line 12, and is connected in parallel to the contact t3 of the de-icer DS.

Further, the neon lamp 13 is provided with a photoelectric conversion element 14 made of cadmium sulfide Cds so as to be able to receive light emitted from the lamp 13, and one end of the element 14 is connected to the electronic control circuit 1.
Connect terminal 1 to terminal 1, and connect the other end of element 14 to resistor 2.
．． It is connected to the operating power supply voltage terminals of the electronic control circuit 11 via the series circuit r3.

The emitter and collector of the transistor Tr are connected to the operating power supply voltage terminal t6 and the defrosting signal input terminal t6 of the electronic control circuit 11, and the resistor r2. The connecting wire of r3 is connected.

By the way, the protective resistor r1 uses a high resistance of, for example, 40Ω, and the neon lamp 13 has two electrodes in a glass tube 15 filled with neon gas and having high insulation resistance and electric resistance. 16° 16 facing each other at an interval of about 1 mm, and the element 14 is attached to the outer surface of the glass tube 15 at a position on the outer surface facing between the electrodes 16 and 16 where the amount of light emitted is large. 13 and element 1
4 is housed in a see-through case 17.

In addition, 18 is a lead wire, 19 is a plug, and 20 is a terminal board provided in the indoor and outdoor units B and A.

Therefore, in the above bark, during heating operation, the contacts ttt t2 of the relays R1 and R2 open, and the four-way switching valve 2
is switched to the heating side, the contacts of the de-Isa DS are closed, the motor M is energized, and the fan F1 is activated (at this time, the fan F2 is also activated), while the neon lamp circuit 30 is activated by the De-Isa DS. The neon lamp 13 is short-circuited and no voltage is applied, so the neon lamp 13 does not emit light and no defrosting signal is input to the input terminal t6 of the electronic control circuit 11.

In this way, when frost occurs on the outdoor coil 3 and the contacts of the de-isser DS are also opened, the resistance value of the protective resistor r1 is much larger than the resistance value of the motor M, for example, 30
The power supply voltage S is applied to the entire neon lamp circuit 30.

Therefore, the motor M is stopped, the fan F1 is stopped (fan F2 is also stopped), and the neon lamp 1 is stopped.
3 starts discharging, the voltage between the electrodes 16 and 16 maintains a constant discharge sustaining voltage (for example, 60 V), and the protective resistor r1
The discharge is maintained at a current determined by , and glow light is emitted.

As a result, the element 14 receives the deterioration light, its resistance value decreases, and a predetermined defrosting signal is input from the transistor Tr to the input terminal t6 of the electronic control circuit 11.

Therefore, relay R2 is energized and contact t2 is closed, four-way switching valve 2 is energized and switched to the cooling side, hot gas flows into outdoor coil 3, and defrosting operation is performed.

Therefore, when performing the defrosting operation as described above, the neon lamp circuit 30 is economical because the power consumption is extremely small, and furthermore, the defrosting operation can be indicated by the light emission of the neon lamp 13, and the neon lamp circuit 30 13 has a long life, so there is almost no need to replace it.

Also, if a surge enters the power line during defrosting operation,
The intruding surge reaches the neon lamp circuit 30, but the neon lamp 13 of the circuit 30 is made of a glass tube, which has extremely high surge resistance compared to light emitting diodes, and has high moisture resistance, stability, and great insulation performance. Since the electrodes 16 and 16 are housed in the neon gas inside the neon lamp 15, the insulation between the neon lamp 13 and the element 14 is as follows.
Regardless of the intruding surge, the defrosting signal is stably and reliably input to the input terminal t6 of the electronic control circuit 11.

In this way, when the defrosting of the outdoor coil 3 is completed and the contacts of the de-icer DS are connected, the motor M is operated and the fan F1 is driven (the fan F2 is also driven).
, the neon lamp circuit 30 is in a state where no voltage is applied, and the input of the defrosting signal to the input terminal t6 of the electronic control circuit 11 is stopped.

Therefore, relay R2 is demagnetized, four-way switching valve 2 is switched to the heating side, and heating operation is restarted.

Further, the defrosting signal line 12 of the neon lamp circuit 30 is
Since the AC defrosting signal is derived from the neon lamp circuit 30 by the operation of the De-Icer DS without using a relay, the number of parts can be reduced and the circuit configuration can be simplified. I can do it,
Furthermore, there are no relay troubles such as disconnection of coils or poor continuity of contacts due to the use of relays, and failures can be eliminated.

In the above explanation, the relay R2 that switches the four-way switching valve 2 during defrosting uses a contact t2 that closes when it is energized, but it may also use a contact that closes when it is demagnetized. It goes without saying that the defrosting signal to be used may be either an L signal or an H signal.

Furthermore, in the above explanation, cadmium sulfide, which is a variable resistance material whose electrical resistance changes depending on the incidence of light, was used as the photoelectric conversion element 14, but other variable resistance materials such as phototransistors, photodiodes, etc. may also be used. good.

As described above, according to the present invention, the neon lamp circuit 30 in which the neon lamp 13 and the protective resistor r1 are connected in series is energized from the AC power source by the switching operation of the de-Icer DS, and the photoelectric conversion element 14 is connected to the neon lamp 13. Since the defrosting signal of the element 14 is inputted to the electronic control circuit 11 by providing the defrosting signal of the element 14 in parallel, the AC defrosting signal generated by the operation of the deicer DS can be inputted to the neon lamp circuit 30 without converting it to DC. The structure of the rectifying circuit and smoothing circuit is simple, there are few failures, and it can be made small and inexpensive.

In addition, since the neon lamp 13 has extremely high surge resistance compared to light emitting diodes, it will not be damaged by intruding surges. The part has a predetermined thickness, and the insulation resistance and withstand voltage are extremely high and stable.Moreover, these values do not decrease even when the humidity outside the glass tube is high, and are even more stable. Since neon gas is sealed in the neon gas, the insulation resistance and withstand voltage between the electrodes housed in the neon gas and the photoelectric conversion element 14 are not only limited during normal operation without intruding surges, but also during surge intrusion. Even when this occurs, it remains stably at an extremely large value.

Therefore, the defrosting signal can be stably and reliably input to the electronic control circuit 11.

Moreover, the neon lamp circuit 30 is economical with extremely low power consumption, and the light emission of the neon lamp 13 eliminates the user's dissatisfaction of not being able to produce warm air even though heating is in progress during defrosting. It is also possible to display defrost status.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention. Figure 1 is a refrigerant piping system diagram, Figure 2 is an electric circuit diagram, and Figure 3 is a combination of a neon lamp and a photoelectric conversion element. It is an explanatory diagram showing a state. 2...Four-way switching valve, 11...Electronic control circuit, 13...Neon lamp, 14...
・Photoelectric conversion element, 30... Neon lamp circuit,
DS...De-Isa, r□...Protection resistance.

Claims (2)

[Scope of utility model registration request] (1) De-Isa DS sends defrost signals to cooling, heating,
This is a heat pump type refrigeration system in which input is made to an electronic control circuit 11 for each operation of defrosting, and the output of the circuit 11 is used to switch a four-way selector valve 2 to the cooling side to perform a defrosting operation. By the switching operation, the neon lamp circuit 30 in which the neon lamp 13 and the protective resistor r1 are connected in series is energized from the AC power supply, and the neon lamp 1
A heat pump type refrigeration system characterized in that a photoelectric conversion element 14 made of cadmium sulfide or the like is provided opposite to the heat pump 3, and a defrosting signal from the element 14 is inputted to the electronic control circuit 11. (2) Connect the outdoor fan motor M and the de-icer DS that turns on and off the fan motor M in series to the power supply, and connect the neon lamp circuit 30 in parallel to the de-icer DS to turn the de-icer DS on and off during heating. The heat pump type refrigeration according to claim 1, which is a registered utility model, is characterized in that the neon lamp circuit 30 is turned on and off by turning off the neon lamp circuit 30, and the neon lamp circuit 30 is energized from an alternating current power source when the diaster DS is turned off. Device.