JPH0150822B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an air conditioner having a heat pump type refrigeration cycle, and in particular, to prevent heat radiation loss and dew condensation from the components of the refrigeration cycle, and to prevent the refrigeration cycle from changing depending on the ambient temperature. This eliminates fluctuations.

[Conventional technology]

Conventionally, air conditioners applied to chilling units, etc. generally consist of a machine room section that houses the refrigeration equipment, a heat exchange room that houses the unused side air heat exchanger, etc., a blower, and a casing section that covers these. The refrigeration system consists of a compressor, a water heat exchanger on the user side, a liquid storage container for storing surplus refrigerant, a throttle device, an accumulator, and the like.

Figure 5 shows a refrigeration cycle diagram of this type of conventional air conditioner, where 1 is a compressor, 2 is a four-way valve,
Reference numeral 3 designates a water heat exchanger on the usage side, in which water from a heat storage tank or a cooling tower is circulated through an outer pipe 3a, and an inner pipe (not shown) inserted into the outer pipe 3a. The refrigerant is circulated by the operation of the compressor 1. Further, 4 is an air heat exchanger on the non-use side, 5 is its blower, 6 is a low-pressure accumulator, and 7 is a throttling device installed in the refrigerant passage connecting the water heat exchanger 3 on the use side and the air heat exchanger 4 on the non-use side. It is composed of check valves 8a to 8d, a dryer 9, a cooling capillary tube 10, a heating capillary tube 11, a solenoid valve 12, an electric expansion valve 13, and a double pipe 14, And the above double pipe 1
4 consists of an inner pipe 14a connected to the electromagnetic valve 12, and an outer pipe 14b connected to the electric expansion valve 13 and wrapped around the inner pipe 14a. Further, 15 is a liquid storage container for surplus refrigerant provided in a refrigerant passage connecting the user-side water heat exchanger 3 and the expansion device 7.

The above-mentioned double pipe uses the fact that the flow rate of refrigerant flowing inside the capillary of the inner pipe depends on the pressure of the inlet refrigerant and the degree of supercooling to control the flow rate around the capillary of the inner pipe 14a by the electric expansion valve 13. This controls the total refrigerant flow rate by changing the degree of supercooling of the capillary in the inner tube.

[Problem that the invention seeks to solve]

The problem with the conventional air conditioner as described above is that the flow rate from the electric expansion valve 13 to the outer pipe of the throttle device not only requires accuracy, but also requires depressurization around the capillary of the inner pipe. Because it adjusts the degree of supercooling by evaporating and exchanging heat, it is easily affected by the outside temperature.
In actual control, it is necessary to make decisions based on both the capillary of the inner tube, the outer tube, and the outside air, and there is a problem that it becomes unstable. Furthermore, since a large number of capillaries and electrical parts are used, there is a large amount of piping vibration from the throttling device during use, and countermeasures are required to dampen this vibration.

Furthermore, air conditioners such as chilling units,
Since it is installed outdoors, the refrigeration system is susceptible to the effects of outside air, resulting in a reduction in heat exchange capacity due to heat radiation, large heat loss in each component, fluctuations in the refrigeration cycle due to the influence of outside air, and condensation on the surfaces of parts. This lowered the reliability of the refrigeration system, and there were also other problems, such as the fact that the frame of the refrigeration system had to have a drain pan structure in order to collect and drain the condensed water.

This invention was made to solve the conventional problems as described above, and prevents heat radiation loss and condensation from the refrigeration cycle components such as the user-side water heat exchanger, throttling device, and liquid storage container. Another object of the present invention is to provide an air conditioner that eliminates fluctuations in the refrigeration cycle due to ambient temperature.

[Means for solving problems]

In the air conditioner according to the present invention, the user-side water heat exchanger is formed in a cylindrical shape, and parts such as a liquid storage container, an accumulator, and a throttle device that constitute another refrigeration device are housed in this cylindrical hollow part. , the housing parts in the hollow part and the entire usage-side water heat exchanger are molded with a heat insulating material.

[Effect]

In this invention, a user-side water heat exchanger formed in a cylindrical shape and a liquid storage container accommodated in the hollow part thereof,
By covering and molding the entire parts of the accumulator and expansion device with a foamed heat insulating material or the like to form a heat insulating structure, the refrigeration system is not affected by outside temperature, and the intended purpose can be achieved.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows a refrigeration cycle diagram of an air conditioner according to the present invention. The same parts as in FIG. state

As is clear from FIG. 1, the components of the refrigeration cycle surrounded by the dashed-dotted line, that is, the user-side water heat exchanger 3, the low-pressure accumulator 6, the throttling device 7, and the entire liquid storage container 15, are made of foamed urethane, etc. It is covered and molded with a foamed heat insulating material 16 to create a heat insulating structure that is completely cut off from the outside air.

FIGS. 2 to 4 show an overall view of the air conditioner, specifically showing the insulation structure of the low-pressure accumulator 6 including the user-side water heat exchanger 3, the expansion device 7, and the liquid storage container 15. , 17 is an underframe formed into a dish shape from a relatively thick steel plate, and four columns 18 are vertically attached to the four corners of this underframe 17. A machine room A is configured by connecting the upper ends of the rear side comrades to each other by connecting plates 19 and 20, respectively. The compressor 1 and the user-side water heat exchanger 3 are installed on the underframe 17 in the machine room A, and the refrigeration device and the blower 5 are installed on the connection plate 19 in the machine room A. An electric control panel 21 equipped with contactors, relays, protection devices, etc. to be controlled is connected to the connecting plate 2.
A cistern tank (not shown) is attached to each of the tanks 0 and 0.

Reference numeral 22 denotes a drain pan mounted on the support column 18, and on this drain pan 22, a non-use side air heat exchanger 4 formed into an L-shape with plate fins and copper tubes is installed. 22a is a drain outlet formed in the drain pan 22.

Reference numerals 23 to 26 are exterior struts attached to the four corner struts 18, and the front, rear, left and right sides surrounded by the exterior struts 23 to 26 are covered with plate materials 27 to 29 as shown in FIG. ~26
It is covered by being attached to and is adapted to form the casing of the device. Further, a fan casing 5a equipped with a blower 5 is integrally attached to the upper ends of the exterior columns 23 to 26 covered with the casing, and the blower 5 is surrounded by an L-shaped non-use side air heat exchanger 4. It is facing the heat exchange chamber B.

Further, the user-side water heat exchanger 3 has a cylindrical shape in which an outer pipe 3a connected to a water circuit of a heat storage tank or a cooling tower and an inner pipe (not shown) connected to a refrigerant circuit are coiled. As shown in FIGS. 3 and 4, in the hollow part 3b of the user-side water heat exchanger 3 formed in this manner, there are installed a low-pressure accumulator 6, check valves 8a to 8d constituting the expansion device 7, and a dryer. 9, a cooling capillary tube 10, a heating capillary tube 11, a solenoid valve 12, an electric expansion valve 13, a double pipe 14, and a liquid storage container 15 are housed, and these are all set in a case 17. After that, the internal space is filled with a foamed heat insulating material 16 such as foamed urethane to cover the entire housing parts including the user-side water heat exchanger 3, and molded to completely isolate each housing part from the outside air. Make it a structure.

Next, the refrigeration cycle operation will be explained according to FIG. 4, where the gas refrigerant is condensed by a blower 5 and becomes a high-pressure liquid refrigerant. This high-pressure liquid refrigerant passes through a check valve 8a to a dryer 9, a solenoid valve 12, an electric expansion valve 13, and a double pipe 1.
4, the pressure is reduced respectively. Also, the cooling capillary tube 10 is also subjected to reduced pressure. The reduced pressure gas/liquid mixed refrigerant evaporates in the user-side water heat exchanger 3, cools the water in the outer tube 3a introduced from the outside, and performs heat exchange. Further, the evaporated gas and liquid mixed refrigerant are sent to the low-pressure accumulator 6, the liquid goes to the bottom, the gas goes through the pipe 6a to the four-way valve 2, and then returns to the compressor 1.

On the other hand, in the case of heating operation, the route is reversed. That is, the high-temperature, high-pressure gas refrigerant discharged from the compressor 1 is sent to the user-side water heat exchanger 3 through the four-way valve 2, where it is condensed by the hot water flowing through the outer pipe 3a and becomes a high-pressure liquid refrigerant. . This high-pressure liquid refrigerant passes through the liquid storage container 15 and the check valve 8b, and is reduced in pressure by the throttle device 7. The pressure is also reduced in the heating capillary tube 11.

When such cooling/heating refrigeration cycle operation is repeated, in conventional refrigerant devices, dew condensation occurs on the surface of the low-pressure accumulator 6 due to the temperature difference with the outside air, and energy loss occurs due to heat radiation from the liquid storage container 15. However, in the embodiment of the present invention, the low-pressure accumulator 6 and liquid storage container 15 are covered with a heat insulating material, so the above phenomenon can be avoided, and the refrigeration cycle is not affected by the outside temperature. I never receive it. Further, the low pressure accumulator 6, the liquid storage container 15, and the expansion device 7 are housed in the cylindrical hollow part 3b of the user-side water heat exchanger 3,
Since it is integrally molded with the heat insulating material 16, the device can be made more compact and there is no problem with drainage.

〔Effect of the invention〕

As explained above, according to the present invention, the user-side water heat exchanger of the refrigeration equipment component is formed to have a cylindrical shape as a whole, and the accumulator and liquid reservoir, which are other parts of the refrigeration equipment, are provided in the hollow part. The structure houses the container, expansion device, etc., and covers these housing parts and the entire user-side water heat exchanger with a molded insulation material, so the outside air and these parts are completely isolated, and there is no energy loss due to heat radiation. Not only can you obtain a refrigeration system that is unaffected by the ambient temperature without condensation, but you can also use space to make the entire refrigeration system compact, and the mechanical vibrations from the power system are absorbed by the heat insulating material, making piping easy. This has the effect that unnecessary vibrations and resonances of the air conditioner and the device are prevented, and that an air conditioner with stable performance can be obtained.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, Figure 1 is a refrigeration cycle diagram of an air conditioner, Figure 2 is an exploded perspective view showing the overall configuration, and Figure 3 is a user-side hydrothermal FIG. 4 is a plan view of the exchanger section, FIG. 4 is a side view thereof, and FIG. 5 is a schematic diagram showing a conventional refrigeration cycle. 1...Compressor, 2...Four-way valve, 3...Using side water heat exchanger, 3b...Hollow part, 4...Non-utilizing side air heat exchanger, 5...Blower, 6...Accumulator, 7 ... Squeezing device, 15 ... Liquid storage container, 16...
...insulation material. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In an air conditioner equipped with a refrigeration system and a non-use air heat exchanger, which constitute a refrigeration cycle with a compressor, a water heat exchanger on the use side, a liquid storage container, a throttling device, an accumulator, etc. The side water heat exchanger is formed into a cylindrical shape, and the liquid storage container, expansion device, accumulator, etc. are housed in the hollow part, and the entire user side water heat exchanger including the housing parts is covered with a heat insulating material. An air conditioner characterized by: