JPS63161365A - Heat pump type air conditioner - 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 a heat pump type air conditioner.

BACKGROUND ART A conventional heat pump type air conditioner, for example in heating operation, as shown in FIG. The basic configuration is a refrigeration cycle in which an evaporator) 34, a four-way valve 35, and a four-way valve 35 are connected in an annular manner through pipes to circulate refrigerant. On the other hand, in recent years, research has been progressing on so-called chemical heat pumps that utilize the heat of adsorption/desorption reactions, and attempts have been made to improve their performance by combining them with the refrigeration cycle shown in Figure 2. For example, as shown in Japanese Unexamined Patent Publication No. 60-16280, there is a configuration shown in FIG. That is, a reaction vessel 46 filled with an adsorbent 45 is placed around a main circuit compressor including a compressor 41, a condenser 42, a pressure reduction mechanism 43, and an evaporator 44, and a subcircuit condenser is placed in a refrigerator 40. 47. A tank 49 for storing an adsorption medium (substance adsorbed by the adsorbent) 4B and a sub-circuit evaporator 50 are connected in a ring, and when the adsorption medium 4B is adsorbed to the adsorbent 45, the sub-circuit evaporator 5o It is cooled by the heat of vaporization (endotherm) of the adsorption medium, and assists the cooling by the evaporator 44 of the main circuit.

Problems to be Solved by the Invention In the most general configuration shown in FIG. 2, during defrosting operation, for example, the four-way valve 3 is used to melt the frost attached to the outdoor heat exchanger.
5, but there was a problem in that the heat amount of the refrigerant was taken away and the temperature of the indoor heat exchanger decreased.

In addition, in recent years, devices have been proposed and commercialized that allow heating operation while continuing heating by installing a bypass circuit or the like without switching the four-way valve, but even then, the heat source during static electricity removal is the refrigerant heat generated at that time. However, there was a problem in that the heating capacity could not be increased due to a lack of heat sources.

The same thing can be said when heating starts up, because the equipment is sufficiently cold, its heat capacity is large, and the refrigerant condenses midway, making it impossible to obtain sufficient circulation. It took a long time for the warm air to come out or for the room to warm up sufficiently.

Although improvements have been made to the refrigeration cycle, these improvements are still insufficient. Furthermore, a combination with a chemical heat pump is considered, but in FIG. 3, it is used to assist in cooling, and cannot be applied to the above-mentioned improvement of defrosting characteristics during heating.

Means for Solving the Problems In order to solve the above problems, the heat pump air conditioner of the present invention connects a compressor, an indoor heat exchanger, a pressure reduction mechanism, and an outdoor heat exchanger in a ring to supply refrigerant. A reaction vessel filled with an adsorbent that forms a main circulation circuit and exhibits reversible heat absorption and heat generation by reacting with the adsorption medium and a reserve tank that stores the adsorption medium are connected so that the adsorption medium is movable. to form a subcircuit, the reaction vessel is connected to a part of the piping from the compressor outlet to the indoor heat exchanger for heat exchange, and the reserve tank is connected from the indoor heat exchanger to the pressure reducing mechanism. It is connected to a part of the piping for heat exchange.

Effects of the present invention Due to the above-described configuration, for example, during several minutes of defrosting operation that is performed while heating continues, and for several minutes until the main circuit generates sufficient heating capacity at the time of startup, the operation is performed in the reaction vessel. The heat generated by the reaction between the adsorbent and the adsorption medium is used to heat the refrigerant in the main circuit to supplement heating capacity, shorten heating startup time, and improve heating capacity during defrosting operation. do. In addition, during regeneration to desorb the adsorption medium from the adsorbent, the reaction vessel is heated by the main circuit and the reserve tank is cooled by the main circuit to improve regeneration efficiency, improve heating start-up performance, and improve removal efficiency. This is intended to improve frost characteristics.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In Fig. 1, 1 is a compressor, 2 is an indoor heat exchanger, 3 is a pressure reduction mechanism, 4 is an outdoor heat exchanger, 5 is silica gel as an adsorbent, 6 is a reaction vessel, and 7 is Freon R1 as an adsorption medium.
2 and 8 are reserve tanks, 9.10 and 14.15 are electromagnetic valves, 11 is a first heat exchanger, 12 is a bypass circuit, 13 is a second heat exchanger, 16 is a check valve, and 17 is a It is a four-way valve.

The first heat exchanger 11 is housed in the reaction vessel 6 together with the silica gel 5, and the first heat exchanger 11 is further provided in the middle of the piping from the four-way valve 17 to the indoor heat exchanger 2. . The solenoid valve 14 is provided between the indoor heat exchanger 2 and the pressure reducing mechanism 3, and a bypass circuit 12 is provided in parallel with the solenoid valve 14.

The bypass circuit 12 is provided with a second heat exchanger 13 on its way, and this second heat exchanger 13 is connected to the reserve tank 8.
It is housed inside along with Freon R12;7. Furthermore, this bypass circuit 12 is equipped with a solenoid valve 15 and a check valve 16. In addition, the reaction container 6 and the reserve tank 8 are
It is connected to two pipes each having electromagnetic valves 9 and 1o in the middle, forming a subcircuit.

Next, the operation of the heat pump air conditioner having this configuration will be explained. During heating operation, the solenoid valve 14 opens, and the solenoid valve 1
5 is closed, and the refrigerant flows through the compressor 1, the four-way valve 17, the first heat exchanger 11, the indoor heat exchanger 2, the solenoid valve 14, the pressure reducing mechanism 3, the outdoor heat exchanger 4, and the four-way valve 17. It flows sequentially and returns to compressor 1.

The state of the subcircuit before the start of the defrosting operation is that 7 Leon R12; 7 is collected in the reserve tank 8, the solenoid valves 9 and 10 are closed, and the silica gel 5 in the reaction vessel 6 is in a dry state. When frost formation is detected by a defrost control device (not shown),
The four-way valve 17 enters defrosting operation while continuing heating. At the same time as the defrosting operation starts, the solenoid valves 9 and 10
When the reservoir tank 8 is opened, Freon R12;7 moves to the reaction vessel 6 via the electromagnetic valve 10, reacts with the silica gel 5, and generates heat. After Freon R12;7 moves, the first heat exchanger 11 that closes the solenoid valves 9 and 10 is buried in the silica gel 5, so the reaction heat is transferred to the refrigerant in the main circuit, and the refrigerant in the main circuit It flows to the outdoor heat exchanger 4 via the indoor heat exchanger 2, the electromagnetic valve 14, and the pressure reduction mechanism 3 in a state where the enthalpy is increased. That is, during defrosting operation, the defrosting time can be shortened by using the reaction heat between silica gel 5 and Freon R12;7 as a heat source to melt the frost attached to the outdoor heat exchanger 4. In addition, the temperature of the refrigerant flowing through the indoor heat exchanger 2 is maintained high to perform heating. Therefore, better defrosting properties can be obtained.

When a control device (not shown) detects the end of defrosting, the solenoid valve 10 is closed and normal heating operation is resumed.

When the temperature of the discharge gas from the compressor 1 reaches a high temperature (approximately 80°C), the solenoid valve 9 is opened, while the solenoid valve 14 is closed and the solenoid valve 1 is closed.
5 is opened, the refrigerant of the main circuit is introduced into the bypass circuit 12, and a regeneration process is started in which Freon R12;7 is desorbed from Silicage/L15 in the subcircuit. That is, this regeneration process utilizes a temperature difference, and the second heat exchanger 13 of the reserve tank 8
The temperature in the first heat exchanger 11 in the reaction vessel 6 is around 70°C due to the high temperature and high pressure refrigerant in the main circuit. For this reason, Freon R12
;7 is desorbed from silikage/L15 and becomes gas, solenoid valve 9
It moves to the reserve tank 8 through the second heat exchanger 13.
It is condensed and stored as a liquid in the reserve tank 8. This regeneration process reaches equilibrium in several tens of minutes, and the regeneration is almost completed. Solenoid valve 9 after a certain regeneration time or when heating operation ends.
is closed, and when the subcircuit is stopped, silica gel 5 and Freon R are
12;7 was maintained in a separated state.

In this embodiment, the four-way valve 17 is kept in the heating cycle during defrosting operation, but it can also be performed in the cooling cycle with the four-way valve 17 reversed, and of course heating cannot be continued, but the solenoid valve 9 at this time 10, 14, and 15 may be the same as described in this embodiment.

When heating starts up, solenoid valves 10 and 14 open,
Although the electromagnetic valves 9 and 15 are closed, the details are the same as those in the AT mode, so a description thereof will be omitted.

Also, for cooling operation, close solenoid valves 9 and 10.15, and close solenoid valve 1.
4 open and switching the four-way valve to perform cooling as before, so the explanation will be omitted.

In the above embodiment, the No. 20 heat exchanger that exchanges heat with the reserve tank was installed in parallel with the piping connecting the indoor heat exchanger and the pressure reduction mechanism, but the invention is not limited to this, and it can be installed in series. Alternatively, the reserve tank may be provided in parallel or in series with the piping connecting the pressure reduction mechanism and the outdoor heat exchanger.In short, the reserve tank may be provided so as to be able to exchange heat with the low temperature side of the main circuit.

In addition, the first heat exchanger for exchanging heat with the reaction vessel was installed in the piping connecting the four-way valve and the indoor heat exchanger, but the invention is not limited to this, and the piping connecting the discharge side of the compressor and the four-way valve. In other words, the reaction vessel may be provided so as to be able to exchange heat with the high pressure side of the main circuit.

In addition, silica gel was used as the adsorbent and Freon R12 was used as the adsorption medium, but in addition to these, zeolite (zeolite), activated carbon, etc. can be used as the adsorbent, and Freon or alcohol other than R12 can be used as the adsorption medium, and it is mainly used in the regeneration process. The combination may be selected depending on the conditions that give the best reproduction rate.

Effects of the Invention As described above, the present invention efficiently performs the regeneration process of the reversible reaction by combining a subcircuit that performs a reversible reaction involving exothermic and endothermic heat with a conventional refrigeration cycle, and effectively utilizes the heat of the main circuit. During defrosting operation and heating start-up, when the main circuit cannot generate sufficient heating capacity, heat is generated through a chemical reaction and the heating capacity is supplemented with the heat, thereby realizing comfortable heating.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram showing an embodiment of the present invention, and FIGS. 2 and 3 are refrigeration cycle diagrams showing conventional examples, respectively. 1...Compressor, 2...Indoor heat exchanger,
3... Pressure reduction mechanism, 4... Outdoor heat exchanger, 5... Adsorbent (silicage A/), 6...
...Reaction vessel, 7...Adsorption medium (Freon R1
2), 8... Reserve tank, 12...
...Bypass circuit, 17...Four-way valve. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
Pressure criticism 2- Inner B contact 1 Moxibustion roar 3-, Chest pressure machine bottle 4- Kangai Kokyu scissors 5- Nawate cutting 6- Hikari S number/3-1 Oni's 1 & female #! Kai/'7-vs; Ben No. 1 Ward 8 Prisoner
D&
Castle 340-

Claims (1)

[Claims] The compressor, indoor heat exchanger, pressure reduction mechanism, and outdoor heat exchanger are connected in a ring to form a main circuit that circulates the refrigerant, and also exhibits reversible heat absorption and heat generation by reacting with the adsorption medium. A subcircuit is configured by connecting a reaction vessel filled with an adsorbent and a reserve tank storing the adsorption medium so that the adsorption medium can move, and the reaction vessel is connected to a pipe from the outlet of the compressor to the indoor heat exchanger. A heat pump type air conditioner, wherein the reserve tank is connected to a part of piping from the indoor heat exchanger to the inlet of the pressure reduction mechanism so as to be heat exchangeable.