JPH03263562A - Cooling heating device with refrigerant heating means - Google Patents

Abstract

PURPOSE:To perform heating even during defrosting operation by a method wherein an auxiliary heat exchange means comprising a second pressure reducing means to reduce the pressure of a refrigerant flowing from the heat exchange means side on the indoor side to the heat exchange means side on the outdoor side and a refrigerant heating means located on the downstream side of the second pressure reducing means and an auxiliary circuit switching means to switch the auxiliary heat exchange means are located in juxtaposition with a first pressure reducing means. CONSTITUTION:During a defrosting mode, a four-way valve 3 and a first solenoid valve 9a are turned OFF, and a second solenoid valve 9b is turned ON. Thereby, a refrigerant is circulated in order of the delivery port of a compressor 2, a first connection port 31 of the four-way valve 3, a third connection port 33 of the four-way valve 3, an indoor heat exchanger 4, a second throttle device 8b, a refrigerant heater 6, the second solenoid valve 9b, an outdoor heat exchanger 5, a second connection port 32 of the four-way valve 3, a fourth connection port 34 of the four-way valve 3, a check valve 12, an accumulator 7, and the suction port of the compressor 2. A fan 14 of the outdoor heat exchanger 5 is turned OFF. This constitution produces the state change of a refrigerant as sown by a solid line, heats frost adhered to the outdoor heat exchanger 5 for removal, and heats the interior of a room.

Description

[Detailed description of the invention] [Industrial application field]

TECHNICAL FIELD The present invention relates to a heating and cooling system equipped with a refrigerant heating means that heats a refrigerant using exhaust heat from an engine or the like.

[Conventional technology]

A device that performs air conditioning and heating through a cycle consisting of "compression means - heat exchange means - decompression means - heat exchange means - compression means", and is equipped with means for heating refrigerant using exhaust heat from an engine, etc. Equipment is provided. For example, in Japanese Patent Application Laid-open No. 62-84273, it is stated that i) during cooling (first compression means and second compression means) → outdoor heat exchange means (
fan on) → first pressure reduction means → indoor heat exchange means → (
(1st compression means 10) 2nd compression means) ii) During heating (1st compression means 2nd compression means) - Indoor heat exchange means →
((first pressure reduction means → outdoor heat exchange means → first compression means)
+ (Second pressure reduction means → Refrigerant heating means → Second compression means)) iii) During defrosting, first compression means → Outdoor heat exchange means (fan off) → First pressure reduction means → Indoor heat exchange means → First compression means A device is disclosed that provides cooling, heating, and defrosting through a cycle of one compression means. Note that "+" indicates parallel operation. Furthermore, Japanese Patent Application Laid-Open No. 61-8574 describes i) compression means during cooling → outdoor heat exchange means (fan-on) → first pressure reduction means → first indoor heat exchange means - compression means 1f) lI! room compression means → first indoor heat exchange means → refrigerant heating means → second
Indoor heat exchange means → second pressure reduction means - outdoor heat exchange means →
Compression means 1ii) During defrosting A device is disclosed that performs cooling, heating, and defrosting through a cycle of compression means - outdoor heat exchange means (fan off) → third pressure reduction means → refrigerant heating means → compression means. There is. A similar device is also disclosed in Japanese Patent Laid-Open No. 63-243669.

[Problems to be solved by the invention]

In the device disclosed in Japanese Patent Application Laid-Open No. 62-84273, heating is stopped during defrosting. That is, by performing the same operation as during cooling with the compression capacity reduced and the fan of the outdoor heat exchange means turned off, the frost adhering to the outdoor heat exchange means is removed. There is. Also, in the device disclosed in Japanese Patent Application Laid-Open No. 61-8574, heating is stopped during defrosting. That is, the indoor heat exchange means is separated from the refrigerant circuit, and the outdoor heat exchange means is heated by the refrigerant heating means to remove frost. Furthermore, the device disclosed in Japanese Patent Application Laid-Open No. 63-243669 is similar to the first two in that heating is stopped during defrosting. However, when defrosting operation is necessary, that is, when frost adheres to the outdoor heat exchange means, the environmental temperature is generally low, and therefore heating is necessary. The present invention has been made in view of the above circumstances, and aims to provide an apparatus that can perform heating even during defrosting operation.

[Means to solve the problem]

The structure of the invention for solving the above problems is such that a gaseous refrigerant compression means, an indoor heat exchange means, a first pressure reduction means capable of bidirectional refrigerant pressure reduction operation, and an outdoor heat exchange means are sequentially arranged in an annular shape. a discharge direction switching means arranged to form a refrigerant circulation circuit and switching the refrigerant discharge direction of the compression means between the direction toward the indoor heat exchange means and the direction toward the outdoor heat exchange means; A second pressure reduction device connected in parallel to the first pressure reduction means and in series with the indoor heat exchange means to reduce the pressure of the refrigerant flowing from the indoor heat exchange means side to the outdoor heat exchange means side. and a refrigerant heating means installed downstream of the second pressure reducing means; and an auxiliary circuit switching means for switching the auxiliary heat exchange means in parallel or in series with the outdoor heat exchange means. This is what we have set up.

[Effect]

In the apparatus of the present invention, the refrigerant flows along the following paths in the following various modes by switching the direction in which the refrigerant flows and the circuit through which the refrigerant flows by using the above-mentioned discharge direction switching means and auxiliary circuit switching means. i) Compression means during cooling → outdoor heat exchange means → first pressure reduction means → indoor heat exchange means → compression means ii) During heating (-example) Compression means → indoor heat exchange means → ((first pressure reduction means → Outdoor heat exchange means) (1) Auxiliary heat exchange means) → Compression means (2) During defrosting, the operation is performed in a cycle of compression means → indoor heat exchange means → auxiliary heat exchange means → outdoor heat exchange means → compression means. That is, during defrosting, the heating cycle is basically used, and an operation is performed in which the auxiliary heat exchange means is arranged in series on the refrigerant inflow side of the outdoor heat exchange means during the cycle.

【Example】

The present invention will be explained in detail below. FIG. 1 is an explanatory diagram showing a circuit configuration of a heating and cooling device according to an embodiment. [1] Configuration of the device First, the circuit configuration of the device will be explained. The circuit of this heating and cooling system consists of a refrigerant circuit in which refrigerant circulates, and a cooling water circuit in which engine cooling water circulates. l) Refrigerant circuit The refrigerant circuit includes a compressor 2, which is a compression means that compresses a gaseous refrigerant to high temperature and high pressure, and a discharge outlet in which a first connection port 31 is connected to the refrigerant discharge port of the compressor 2 via piping. A four-way valve 3 as a direction switching means, and an outdoor heat exchanger 5 as an outdoor heat exchange means whose one end 51 is connected to the second connection port 32 of the four-way valve 3 via piping.
and one end 41 is connected to the third connection port 33 of the four-way valve 3 via piping.
The indoor heat exchanger 4 of the indoor heat exchange means connected to A basic circuit is a circuit consisting of a first throttle device 8a as a first pressure reducing means capable of pressure reducing operation. Further, the basic circuit includes a first aperture device 8 in the basic circuit.
In parallel with a, a second throttle device 8b of a second pressure reducing means that reduces the pressure of the refrigerant flowing from the other end 42 side of the indoor heat exchanger 4 to the other end 52 side of the outdoor heat exchanger 5, and the second throttle device Nib Auxiliary heat consisting of a refrigerant heater 6 as a refrigerant heating means disposed downstream of the refrigerant heater 6, and a first solenoid valve 9a and a second solenoid valve 9b as an auxiliary circuit switching means disposed downstream of the refrigerant heater 6. Exchange circuits are connected. In the auxiliary heat exchange circuit, one end of the first solenoid valve 9a is connected to the refrigerant heater 6 and the second solenoid valve 9b via piping, and the other end of the first solenoid valve 9a is connected to the piping. and is connected to the fourth connection port 34 of the four-way valve 3 via the check valve 12. Moreover, from between the first electromagnetic valve 9a and the check valve 12,
One end of the accumulator 7 is connected via a pipe, and the other end of the accumulator 7 is connected to a refrigerant suction port of the compressor 2 via a pipe. Further, a fan 14 is provided near the outdoor heat exchanger 5, and a fan 13 is provided near the indoor heat exchanger 4. Note that in the above, the compressor 2 is driven by the engine 1. ii) Cooling water circuit The cooling water circuit consists of a basic circuit that circulates between the cooling section of the engine 1 and the radiator 10, and an auxiliary circuit that circulates between the cooling section of the engine 1 and the refrigerant heater 6. A solenoid valve 11b is provided in the basic circuit, and a solenoid valve 11a is provided in the auxiliary circuit, and the cooling water is circulated in both circuits by turning on and off these two solenoid valves. Route switching is performed. That is, a) Cooling water circulates in both the 11a-on and 1lb-on circuits. o) Cooling water circulates only in the 11a-on, 1ib-off auxiliary circuit. c) Cooling water circulates only in the basic circuits 11a/off and 1.1b/on. Cooling water does not circulate in both the -111a-off and l1b-off circuits. controlled as follows. [2] Operation of the device Next, the operation of the device will be explained. Incidentally, FIG. 2 shows Mollier diagrams during each of the following operations. i) Cooling mode In cooling mode, four-way valve 3 is on (operating position during cooling)
Then, the first solenoid valve 9a and the second solenoid valve 9b are turned off. Therefore, the refrigerant flows as follows: "First connection port 31 of the discharge low four-way valve 3 of the compressor 2 → second connection port 32 of the four-way valve 3 → outdoor heat exchanger 5 → first throttle device 8a - indoor heat exchanger 4 → It circulates through the following path: third connection port 33 of the four-way valve 3 → fourth connection port 34- of the four-way valve 3 + check valve 12 → accumulator 7 → suction port of the compressor 2. Further, at this time, the circulation of the cooling water on the auxiliary circuit side is stopped. As a result, the refrigerant undergoes a state change as shown by the broken line in FIG. 2, thereby cooling the interior of the room. ii) Heating mode In heating mode, four-way valve 3 is off (operating position during heating)
be done. Further, the first solenoid valve 9a is turned on/off, and the second solenoid valve 9a is turned on/off.
Solenoid valve 9b is turned off. Therefore, the refrigerant is transferred from the first connection port 31 of the discharge low four-way valve 3 of the compressor 2 to the third connection port 33 of the four-way valve 3 to the indoor heat exchanger 4 to ((first throttling device 8a to outdoor heat exchanger 5→Second connection port 32 of west valve 3
→ Fourth connection port 34 of four-way valve 3 → Check valve 12) + (Second throttle device 18b → Refrigerant heater 6 → First solenoid valve 9a: when first solenoid valve 9a is on) → Akicomulator 7 → Compressor It circulates through the 2nd inlet. Moreover, at this time, in principle, cooling water is circulated to the auxiliary circuit side in the cooling water side circuit. As a result, the refrigerant undergoes a state change as shown by the dashed line in FIG. 2, heating the interior of the room. iii > In defrost mode In defrost mode, four-way valve 3 is off (operating position during heating)
be done. Further, the first solenoid valve 9a is turned off, and the second solenoid valve 9b is turned on. Therefore, the refrigerant is transferred as follows: "First connection port 31 of the discharge low four-way valve 3 of the compressor 2 → Third connection port 33 of the four-way valve 3 → Indoor heat exchanger 4 → Second throttle device i'8b → Refrigerant heater 6 →Second solenoid valve 9b→Outdoor heat exchanger 5→Second connection port 32 of four-way valve 3→Fourth connection port 34 of four-way valve 3→Check valve 12→Accumulator 7→Suction port of compressor 2" path It circulates. Note that the fan 14 of the outdoor heat exchanger 5
has been turned off. Moreover, at this time, in principle, cooling water is circulated to the auxiliary circuit side in the cooling water side circuit. As a result, the refrigerant changes its state as shown by the solid line in FIG. 2, heats and removes the frost adhering to the outdoor heat exchanger 5, and heats the room.

【Effect of the invention】

The present invention is equipped with a means for heating a refrigerant using exhaust heat from an engine, etc., and in the defrosting mode, the heating cycle is basically used, and by operating the switching means, the room temperature during the cycle is changed. This is a heating and cooling device in which an auxiliary heat exchange means including an auxiliary pressure reducing means and a refrigerant heating means is arranged in series on the refrigerant inflow side of the outside heat exchange means. According to the present invention, the defrosting mode is set based on the heating mode. That is, heating is performed even during defrosting. Further, in the defrosting mode, the auxiliary heat exchange means is arranged in series upstream of the outdoor heat exchange means. Therefore, defrosting efficiency is improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the circuit configuration of the heating and cooling device according to the embodiment, and FIG. 2 is a Mollier diagram showing the state of the refrigerant in three modes of the device. 2゛Compression 3 Four-way valve 4・'Indoor heat exchanger 5゛°Outdoor heat exchanger 6゛・Refrigerant heater 8a First throttle device g b-Second throttle device 9a First solenoid valve 9b Second solenoid valve

Claims (1)

[Scope of Claims] A gaseous refrigerant compression means, an indoor heat exchange means, a first pressure reduction means capable of bidirectional refrigerant pressure reduction operation, and an outdoor heat exchange means are sequentially arranged in an annular manner to compress the refrigerant. form a circulation circuit of
A heating and cooling apparatus comprising a discharge direction switching means for switching the refrigerant discharge direction of the compression means between the direction towards the indoor heat exchange means and the direction towards the outdoor heat exchange means, the first pressure reduction means a second pressure reducing means connected in parallel to and in series with the indoor heat exchange means to reduce the pressure of the refrigerant flowing from the indoor heat exchange means side to the outdoor heat exchange means side; A refrigerant heating means comprising: an auxiliary heat exchange means comprising a refrigerant heating means installed on the downstream side; and an auxiliary circuit switching means for switching the auxiliary heat exchange means in parallel or in series with the outdoor heat exchange means. Heating and cooling system.