JPS6189450A - Air cooling heat pump type refrigeration cycle device - 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 Application of the Invention] The present invention relates to an air-cooled heat pump type refrigeration cycle device, and is particularly suitable for maintaining heating capacity when the outside air temperature is low and improving the ion removal capacity. This relates to an air-cooled heat pump type refrigeration cycle.

[Background of the invention]

A conventional air-cooled heat pump type refrigeration cycle device will be explained with reference to FIGS. 2 to 5.

Here, Fig. 2 is a system diagram of a conventional air-cooled heat pump type refrigeration cycle, Fig. 5 is a configuration diagram of a conventional air-side heat exchanger section, and Fig. 4 is a diagram of the refrigeration cycle of the device shown in Fig. 3. System diagram, Figure 2 is a system diagram of a refrigeration cycle of another conventional device.

The column in Figure 2 shows the refrigeration cycle of a general Boso heat pump type water heater, etc., where 1 is the pressure! (a,
2 is a four-way valve that switches the flow of the refrigerant flow path; 3 is a water-side heat exchanger related to the indoor heat exchanger; and 4 is an air-side heat exchanger related to the outdoor heat exchanger. 5.8 is a check valve, 6.1
is a capillary tube related to the refrigerant pressure reduction means, solid arrows in the figure indicate the flow of the refrigerant during the heating operation, and broken arrows indicate the flow of the refrigerant during the aphrodisiac operation.

During heating operation, high-temperature, high-pressure refrigerant waste discharged from the compressor 1 passes through the four-way valve 2 as shown by the solid line arrow to the water side fA3.
The refrigerant enters the 2" unit 3 (acts as a condenser), radiates heat to the water, supplies hot water, and condenses itself. This cold 6 condenses'
e is depressurized and expanded in the capillary tube 7 for heating operation through the check valve 5, and enters the air/side heat exchanger 4A (acting as an evaporator).Here, the refrigerant exchanges heat with the air and evaporates. The refrigerant gas becomes a low-temperature, low-pressure refrigerant gas and returns to the compressor 1 via the four-way valve 2, whereupon the same cycle is repeated.

In this way, the air f1 that acts as an evaporator during the 4-turn heating
! Since the box is attached to the heat exchanger 4A, defrosting will be performed in a reverse cycle.

In other words, during the waste removal operation, the discharge γ from the pressure jMtat
The refrigerant gas under high temperature pressure is passed through the four-way valve 2 as shown by the dashed arrow.
The air then enters the air side heat exchanger 4A (acting as a condenser) K, where it melts the frost and exchanges heat with the air to condense it. This refrigerant condensate passes through the check valve 8, is depressurized and expanded in the capillary chaperone for defrosting operation, and enters the water side heat exchanger 3 (operating as an evaporator). It becomes a gas and returns to the compressor IV via the four-way valve 2.

During this kind of defrosting operation, the water in the air side heat exchanger 4A will turn into a lump and fall, but during the next heating operation, the water at the bottom of the air side PA exchanger 4A will freeze again. However, conventional refrigeration cycles have a problem in that the lower part of the air-side heat exchanger tends to freeze.

In other conventional examples shown in FIGS. 3 and 4, a heating pipe 13 is provided at the bottom of the air side heat exchanger 4B in order to prevent freezing at the bottom of the air side heat exchanger. . Figure 2
=-, which is the same part as 1 with the same symbol as in Fig. 2, and the refrigeration cycle system and arrow types in the parts other than those shown in Fig. 4 are the same as in Fig. 2. be.

As shown in FIGS. 3 and 4, during heating operation, as indicated by the arrows, the refrigerant pipe 9 on the refrigerant liquid side is branched by providing a T-joint 10 for the branch pipe, and one side is connected through the capillary tube 7. One end was connected to the main coil 11 of the air side heat exchanger 4B, and the other end was connected to a heating pipe 13 disposed at the bottom of the air heat exchanger 4B.

In such a refrigeration cycle, during heating operation, the lower part of the air side heat exchanger 4B is heated to prevent frost formation and ice formation, but during defrosting operation, the heating effect is for active defrosting. There was no heat exchange area of the heating pipe 13.

Next, still another conventional example is shown in FIG.

The refrigeration cycle systems not shown in FIG. 5 and the types of arrows are the same as in FIG. 2. .

In the example shown in FIG. 5, the pipe branched from the refrigerant pipe 9 via the lower joint 10 is connected to the heating pipe 1 at the bottom of the air heat exchanger 4C.
6 and then equipped with a check valve 15 to supply air 9.
Connected to the heating refrigerant inlet side of the ig heat exchanger main pipe. 14 is a capillary tube for heating operation.

According to this, during heating operation, the lower part of the air-side heat exchanger 4C is heated to effectively prevent frost formation and icing, but during removal operation, the refrigerant flows through 16 parts of the heating piping as shown by the broken line arrow. There were drawbacks such as an increase in pressure loss, a decrease in the amount of refrigerant circulated, and a decrease in defrosting ability.

In addition, as a prior art related to the prevention of frost formation and freezing of such air-cooled heat pump type refrigeration cycle equipment,
Publication No. 182454 describes a refrigerant circuit equipped with a sub-condenser that allows refrigerant to flow during four-way operation and cooling operation, and to stagnate the refrigerant therein during heating operation. However, a cycle configuration that is not effectively used during defrosting operation, and a cycle that ensures a sufficient amount of refrigerant circulation especially when the outside temperature is low, has not been provided.

In addition, Japanese Patent Application Laid-open No. 57-196055 discloses that during heating and when the outside air temperature is low, high-pressure refrigerant from an indoor heat exchanger is heat-exchanged with a gas-liquid separator, and then the gas-liquid separator is used again. A method is described in which a gas refrigerant is introduced into the outdoor unit to separate the gas refrigerant and lead it to the outdoor unit, thereby preventing the ink of the outdoor unit.

However, even in this method, a cycle configuration that can be effectively used during both heating operation and defrosting operation has not been provided.

[Purpose of the invention]

The present invention was made in order to solve the problems of the prior art described above, and prevents freezing of the outdoor heat exchanger during heating operation, and prevents frost from melting and increases the amount of refrigerant circulation during defrosting operation. The purpose of this invention is to provide an air-cooled heat pump type refrigeration cycle device that can improve defrosting performance and prevent freezing.

[Summary of the invention]

The configuration of the air-cooled heat pump type refrigeration cycle according to the present invention is an air-cooled heat pump type refrigeration cycle device comprising a compressor, a four-way valve, an indoor side heat exchanger, an outdoor side heat exchanger, a refrigerant pressure reduction means, and a refrigerant pipe line connecting these devices. A branch pipe is provided in the refrigerant piping section connecting the refrigerant pressure reduction means for heating operation and the refrigerant pressure reduction means for defrosting operation, and this branch pipe is connected to the heating pipe arranged at the lower part of the outdoor heat exchanger. ,
The other end of the heating pipe is equipped with a pressure reducing means and is connected to the main pipe line which becomes the refrigerant inlet side during heating of the outdoor side heat exchanger, and the other end is equipped with a check valve and is installed on the outdoor side. The refrigerant is connected via a three-way valve to a pipe provided to connect to the main pipe on the refrigerant outlet side during heating of the heat exchanger.

As an additional note, the present invention has a new cycle configuration so that the heating piping for suppressing frost formation provided at the bottom of the air side heat exchanger can be effectively used during both heating operation and defrosting operation. This is a 9-refrigerated bong type refrigeration system that can increase the amount of refrigerant circulated to improve defrosting performance, especially when the outside air temperature is low and the defrosting heat source temperature is low. It consists of a cycle.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Here, FIG. 1 is a system diagram of an air-cooled heat pump type refrigeration cycle according to an embodiment of the present invention.

In the figure, parts with the same reference numerals as those in FIG. 2 are the same parts as in the prior art, so their explanation will be omitted.

Further, the solid arrows in the figure indicate the flow of refrigerant during heating operation, and the doomed arrows indicate the flow of refrigerant during defrosting operation.

The refrigeration cycle device shown in FIG. 1 is a refrigeration cycle device such as an air-cooled heat pump type water heater, and the air-side heat exchanger 4 is an air-side heat exchanger related to an outdoor-side heat exchanger.
It has a main coil 11 connected to the main refrigerant pipe of the refrigeration cycle, and a heating pipe 21 is disposed below the main coil 11 .

9 is a refrigerant pipe that is on the refrigerant liquid inlet side with respect to the air side heat exchanger 4 during heating operation, and 12 is a pilar tube 7 that is on the refrigerant gas outlet side with respect to the air side heat exchanger 4 during heating operation, and a defrosting operation. It is located in the 20th section of the refrigerant piping that connects the capillary chamber.

22, 23, and 27 are all three-way valves that switch the flow of the refrigerant flow path when the refrigerant pipes are connected. 24 is a three-way valve in the main pipe line that is the inlet side of the refrigerant during heating operation of the air side heat exchanger 4. This pipe is connected via a three-way valve 27 to the main pipe line that is the outlet side of the refrigerant during heating operation of the air side heat exchanger 4, and is equipped with a check valve 25 and a capillary tube 26. ing. The three-way valve 22 is a check valve 25.
It is located between the 2nd and 2nd cabinets 26.

That is, one end of the heating pipe 21#''1i1 located at the lower part of the air side heat exchanger 4 is connected to the refrigerant pipe 9 via the T-joint 20 for branch pipe, and the other end of the heating pipe 21 is connected to the refrigerant pipe 9 connected to the pressure reducing means. The air-side heat exchanger is equipped with a capillary tube 26 and connected to a main pipe line on the refrigerant population side during heating operation of the air-side heat exchanger via a three-way valve 21, and a check valve 25. It is connected via a three-way valve 22 to a distribution f24 which is connected via a three-way valve 23 to the main pipe line which is the refrigerant outlet side during heating operation.

The rest of the structure of the cycle equipment is the same as that of the conventional cycle equipment described above with reference to FIG.

Next, the operation of such an air-cooled heat pump type refrigeration cycle device will be explained.

During heating operation, high-temperature, high-pressure refrigerant gas discharged from the compressor 1 passes through the four-way valve 2 and enters the water-side heat exchanger 3 (acting as a condenser) associated with the indoor heat exchanger, as shown by the solid line arrow. , heat is radiated to water to supply hot water, and the refrigerant itself condenses. This refrigerant condensate flows through the refrigerant pipe 9 through the check valve 5, and is divided into two parts: one flows into the heating operation capillary tube 7 through the T-joint 20, and the other flows into the heating pipe 21.

In the heating operation capillary tube 7, the refrigerant expands under reduced pressure and enters the main coil 11 of the air side heat exchanger 4.

On the other hand, in the heating pipe 21, the lower part of the air side heat exchanger 4 is heated by the heat of the refrigerant condensate to prevent frost formation and freezing.
It expands under reduced pressure through the capillary tube 26 and enters the main coil 11 of the air side heat exchanger 4 (acting as an evaporator).

The low-temperature, low-pressure refrigerant gas evaporated by heat exchange with the air in the main coil 11 flows through the refrigerant pipe 12, returns to the compressor 1 via the four-way valve 2, and repeats the same cycle.

In addition, during defrosting operation, the high-temperature, high-pressure refrigerant gas discharged from the pressure M machine 1 flows through the refrigerant pipe 12 via the four-way valve 2 as indicated by the broken line arrow, and flows through the air-side heat exchanger 4 (acting as a condenser). The one that enters the main coil 11 and the one that enters the pipe 2 from the three-way valve 23
Divides the flow into 4.

In the main coil 11, the refrigerant gas melts and exchanges heat with the air, and the refrigerant itself condenses, and the refrigerant condensate flows to the check valve 8.

On the other hand, the refrigerant gas flowing from the pipe 24 through the check valve 25 enters the heating pipe 21 from the three-way valve 22, heats the lower part of the air heat exchanger 4, flows down to the refrigerant condensate, and flows into the check valve 8. It joins with the refrigerant condensate that has passed through the joint at 20 joints, flows through the refrigerant pipe 9, is depressurized and expanded through the capillary cup for defrosting operation, and then enters the water side heat exchanger 3 (acts as an evaporator). . Here, the refrigerant exchanges heat with water, evaporates, becomes a low-temperature, low-pressure refrigerant gas, returns to the compressor 1 via the four-way valve 2, and repeats the same cycle.

In this embodiment, an example of a water heater having a cycle of heating operation and defrosting operation is shown, and cooling operation is not mentioned.

According to this embodiment, during heating operation, especially under conditions of low outside air temperature, the condensate flows through the heating pipe 21 installed at the lower part of the air-side heat exchanger 4, which is provided separately from the main circuit of the refrigeration cycle. The refrigerant passes through the capillary tube 26, joins the main circuit, and enters the air side heat exchanger 4 (acting as an evaporator), which prevents a decrease in the amount of refrigerant circulation and, compared to a conventional refrigeration cycle, It is possible to improve heating capacity.

Further, the aforementioned heating pipe 21 can heat the lower part of the air-side heat exchanger 4 to prevent frost formation and ice formation, and also to prevent ice formation on the drain pan.

Furthermore, during defrosting operation, the high-pressure, high-temperature discharged refrigerant gas from the compressor 1 is divided into the main coil 11 of the air-side heat exchanger 64 and the heating pipe 21, so the defrosting capacity is reduced due to increased circulation. Improvements are expected, and the heating piping 21 also has the effect of preventing ice formation and increasing the temperature of melted water, as well as facilitating drainage.

In addition, in the above embodiment, an air-cooled heatbond type water heater having a refrigeration tickle for heating operation and defrosting operation was described, which was equipped with a water-side heat exchanger 3 and an air-side heat exchanger 4. However, the present invention is not limited to this, and includes an air-cooled heat pump type air conditioner that exchanges heat with air between indoor and outdoor heat exchangers, and air-cooled heat pumps that can also perform cooling operation and can be expected to have the same effect. This is a general-purpose type refrigeration cycle device.

〔Effect of the invention〕

As described above, according to the present invention, freezing of the outdoor heat exchanger is prevented during heating operation, and no frost melting and no increase in refrigerant circulation amount occur during defrosting operation, improving n1 removal performance and freezing. It is possible to provide an air-cooled heat pump type refrigeration cycle device that can prevent such problems.

[Brief explanation of the drawing]

Fig. 1 is a system diagram of an air-cooled heat pump type refrigeration cycle according to an embodiment of the present invention, Fig. 2 is a system diagram of a conventional air-cooled heat pump type refrigeration cycle, and Fig. 3 is a system diagram of a conventional air-cooled heat pump type refrigeration cycle.
1t! 1 is a block diagram of the heat exchanger section, FIG. 4 is a system diagram of the refrigeration tickle of the apparatus shown in FIG. 3, and FIG. 5 is a system diagram of the refrigeration cycle of the conventional pond apparatus. 1... Compressor 2... Four-way valve 3... Water side heat exchanger 4... Air side heat exchanger 6... Capillary tube for removal operation 7... Capillary tube for heating operation 5.8...Check valve 9,12...
・Refrigerant piping 11... Main coil 20... T-joint 21... Heating pipe 22.23.27...
Three-way valve 24...Piping 25...Check valve 26.
...Capillary tube.

Claims (1)

[Claims] In an air-cooled heat pump type refrigeration cycle device consisting of a compressor, a four-way valve, an indoor side heat exchanger, an outdoor side heat exchanger, a refrigerant pressure reducing means, and a refrigerant pipe line connecting these devices, the refrigerant pressure reducing means for heating operation and the refrigerant for defrosting operation are used. A branch pipe is provided in the refrigerant piping section that connects to the pressure reducing means, and this branch pipe is connected to the heating pipe arranged at the lower part of the outdoor heat exchanger, and the other end of the heating pipe is equipped with the pressure reducing means. and a main pipe provided with a check valve to be connected to the refrigerant inlet side during heating of the outdoor heat exchanger, and a main pipe provided with a check valve and connected to the refrigerant outlet side during heating of the outdoor heat exchanger. 1. An air-cooled heat pump type refrigeration cycle device, characterized in that it is configured to be connected to piping provided to connect to a road via a three-way valve.