JPH0468476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a compressor for a refrigeration system that can constitute a more efficient refrigeration system.

(Prior art) For example, in a separate air conditioner, if frost forms on the outdoor heat exchanger during heating operation,
It is necessary to interrupt the heating operation and perform a defrost operation to remove the frost. In order to maintain indoor comfort during such a defrost operation, for example, Japanese Patent Laid-Open No. 60-245968 discloses a device as shown in FIG. 6. In the same figure, 80
is a compressor, and an outdoor heat exchanger 81, a pressure reducing device 82, an indoor heat exchanger 83, a four-way switching valve 84, and an accumulator 85 are connected in this order to constitute a heat pump type refrigeration cycle. Then, a liquid pipe 86 connecting the outdoor heat exchanger 81 and the pressure reducing device 82 is connected to the inlet side of the accumulator 85 through a bypass pipe 89 in which a throttle 87 and an on-off valve 88 are interposed. are doing. The pressure reducing device 82 is comprised of an expansion valve that automatically opens and closes in response to the temperature detected by a temperature-sensitive tube 90 attached to the inlet side pipe of the accumulator 85.

Defrost operation in the apparatus configured as described above is performed by switching the four-way selector valve 84 so that the refrigerant circulates in the direction of the solid arrow in the figure, and by opening the on-off valve 88. At this time, the refrigerant circulates from the compressor 80 to the outdoor heat exchanger 81 and the bypass piping 89. During this refrigerant circulation,
The temperature sensing tube 90 is in a higher temperature state than during the heating operation cycle, so the pressure reducing device 82 is closed and no refrigerant flows toward the indoor heat exchanger 83. This reduces the discomfort caused by the drop in indoor temperature when defrosting was conventionally performed by circulating the refrigerant through the indoor heat exchanger and transferring the heat from the indoor side to the outdoor heat exchanger. The Rukoto. The amount of heat required for defrosting is provided by the heat storage material 92 provided around the housing 91 of the compressor 80, in addition to the compression work in the compressor 80. That is, the amount of heat that was dissipated from the housing 91 of the compressor 80 into the surrounding atmosphere during the heating operation up to that point is stored in the heat storage material 92, and this amount of stored heat is distributed to the compressor 80 during the defrost operation. It is added to the refrigerant to supplement the amount of heat required for defrosting.

(Problem to be solved by the invention) By utilizing the amount of heat dissipated into the atmosphere from the compressor operated at high temperatures as described above, it is possible to improve comfort during defrosting, for example. It is. However, in the conventional configuration in which a heat storage material is provided around the compressor housing,
Thermal storage heat is added to the refrigerant when it is a gaseous refrigerant that circulates at a high flow rate inside the compressor while receiving compression work inside the compressor. The amount of heat obtained cannot be made that large. Therefore, even in the conventional example described above, the amount of heat provided per unit time is not so large, so it takes a long time to defrost the outdoor heat exchanger 81, and during this time, the indoor heating is not performed. The problem is that the room temperature gradually decreases, reducing comfort.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to make it possible to utilize the amount of heat radiated from the compressor body more efficiently, thereby improving air conditioning comfort during defrosting operation, etc. An object of the present invention is to provide a compressor for a refrigeration system that can further improve the performance.

(Means for Solving the Problems) Therefore, in the compressor for a refrigeration system of the present invention, a heat exchanger 5 having refrigerant pipe connection ports 13 and 14 is disposed around the compressor main body housing 1.

(Function) In the compressor for refrigeration equipment having the above configuration, the amount of heat to be released from the compressor main body housing 1 to the outside is absorbed by the heat exchanger 5 disposed around the main body housing 1. It is applied to the refrigerant flowing inside the exchanger 5. Therefore, the refrigerant piping connection ports 13 and 14 of this heat exchanger 5 are, for example, a place where the refrigerant flowing through this heat exchanger 5 flows in a liquid state, and furthermore, the refrigerant is transferred from the liquid to gas by obtaining the latent heat of vaporization. By connecting the refrigerant to a point where the flow condition is such that the phase changes to , it becomes possible to perform heat exchange with an increased amount of heat applied per unit time compared to the amount of heat applied to the gas refrigerant state in conventional devices.
As a result, for example, during defrost operation during heating operation, the amount of heat that the refrigerant obtains per unit time increases, making it possible to shorten the defrost time and perform defrost operation that suppresses the drop in room temperature. This makes it possible to improve performance.

(Example) Next, a specific example of the compressor for a refrigeration system according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a perspective view showing the configuration of a compressor A for a refrigeration system in an embodiment of the present invention.
The compressor main body housing 1, which has a cylindrical side wall and is configured as a closed container, has a refrigerant discharge pipe 2 at its upper end and extends radially outward at its lower end, and further extends from the axis of the main body housing 1. A refrigerant suction pipe 3 extending upward in parallel with the refrigerant suction pipe 3 is connected to each refrigerant suction pipe 3 , and an accumulator 4 is interposed in a vertical portion of the refrigerant suction pipe 3 . A heat exchanger 5 made of an extruded aluminum alloy plate is provided around the cylindrical side wall of the main body housing 1. This heat exchanger 5 is constructed by bending a flat plate in which a large number of channels 6 having a rectangular cross section are formed parallel to each other into a substantially Ω-shaped cross section. A section 7 having an arcuate cross section that surrounds substantially the entire circumference of the side wall portion of the main body housing 1
and flat parts 8 and 9 extending in parallel outward in the radial direction at both ends of the arcuate part 7, and pipe members disposed above and below so as to close each end surface of these flat parts 8 and 9. Brazed manifold pipe 1
It is composed of 0 and 11. The inside of one of the manifold pipes 10 is divided into upper and lower parts approximately in the center by a partition plate 12, and refrigerant pipe connection ports 13, 14 are provided on the upper and lower sides.
are connected to each other. Therefore, as shown in the figure, for example, when refrigerant is introduced from the lower refrigerant pipe connection port 14, the manifold pipe 10
The refrigerant flows into the rectangular flow path 6 in the plane part 8 that opens into the space below the internal partition plate 12, and then goes around the arcuate part 7 approximately once and then from the other plane part 9.
It flows into the manifold pipe 11. Next, in this manifold pipe 11, the flow flows from the lower side to the upper side, and again flows through the flat part 9 and the arcuate part 7 in the opposite direction to the above, to the flat part 8, the manifold pipe 10, and the upper refrigerant piping outflow port. It flows out from 13.

The inner circumferential surface of the arcuate portion 7 of the heat exchanger 5 is attached to the side wall portion of the main housing 1 in close contact with the outer circumferential surface of the arcuate portion 7 of the heat exchanger 5. A ring-shaped heat storage tank 20 is provided in close contact with the heat storage tank 20 so as to surround the outer periphery of the heat storage tank 20. This heat storage tank 20 consists of a container filled with a heat storage material 21 made of, for example, calcium chloride hexahydrate, and an aluminum foil 22 attached to the outer circumferential surface of the container to suppress radiant heat radiation. There is. Further, its outer periphery is surrounded by a sound insulating material 23 made of glass wool and rubber, and this sound insulating material 23 provides not only sound insulation but also vibration isolation and heat insulation.

In the compressor A for a refrigeration system having the above configuration, the main body housing 1 is in a high temperature state when the compressor is operated, and the amount of heat that is to be radiated to the outside from the main body housing 1 is first transferred to the heat exchanger 5, and then the heat is transferred to the heat exchanger 5. When a low-temperature refrigerant flows through the refrigerant, the above amount of heat is imparted to the refrigerant. Further, if there is no refrigerant flowing, or if an excessive amount of heat exceeding the amount of heat required for heating the refrigerant is generated from the main body housing 1 even when the refrigerant is flowing, the amount of heat is not transferred from the heat exchanger 5 to the heat storage material 21. , for example, is converted into latent heat necessary for the solid-liquid phase change of calcium chloride hexahydrate and stored. When low-temperature refrigerant flows through the heat exchanger 5, or when the flow rate increases and the heat exchanger temperature decreases, the amount of heat stored in the heat storage material 21 is transferred to the heat exchanger 5. 5 side, thereby imparting heat to the circulating refrigerant. Furthermore, even when the compressor is stopped, by performing energization control that energizes two phases of the three-phase induction coil for rotationally operating the compressor, the above-mentioned energizing current can be maintained without rotating the compressor. It is also possible to generate heat, and it is also possible to store this generated heat amount in the heat storage material 21. Alternatively, a configuration may be adopted in which a heater is disposed close to the heat storage material 21.

Next, a specific application example of a refrigerant circuit using the compressor A for refrigeration equipment as described above will be described.

A first application example is shown in FIG.
It is connected to the. And this four-way switching valve 30
, a pressure reducing mechanism 3 consisting of a first gas pipe 31, an indoor heat exchanger 32, a first liquid pipe 33, and a capillary tube.
4. A refrigerant circulation circuit is constructed by sequentially connecting the second liquid pipe 35, the outdoor heat exchanger 36, and the second gas pipe 37. Further, in the refrigerant circuit of this first application example, one refrigerant pipe connection port 14 of the heat exchanger 5 provided around the main body housing of the compressor A is connected to the second liquid by a first bypass pipe 38. The pipe 35 and the other refrigerant pipe connection port 13 are connected to the inlet side of the accumulator 4 of the suction pipe 3 through a second bypass pipe 39, respectively. An on-off valve 40 is provided in the first bypass pipe 38, and a throttle 41 made of a capillary tube is provided in the second bypass pipe 39.

In the refrigerant circuit having the above configuration, the on-off valve 40
is in the closed state and the four-way switching valve 30 is switched so that the refrigerant circulates in the direction of the solid line arrow in the figure. Heating operation is performed by switching 30 respectively. If frost forms on the outdoor heat exchanger 36 during heating operation and a defrost operation becomes necessary, the four-way switching valve 30 remains in the heating operation switching position and the on-off valve 40 is opened. speak. As a result, in addition to the refrigerant circulation in the heating cycle in the direction of the solid arrow in the figure, a bypass flow is generated which branches at the second liquid pipe 35, flows through the heat exchanger 5, and then returns to the suction pipe 3. . That is, the high-temperature, high-pressure gas refrigerant discharged from the compressor A radiates heat and condenses in the indoor heat exchanger 32, becoming a high-temperature, high-pressure liquid refrigerant. Therefore, on the indoor heat exchanger 32 side, the heating operation is continued even during the defrost operation. And pressure reduction mechanism 3
4, it becomes a low-temperature, low-pressure liquid refrigerant, and then is divided into two streams: one is connected to the outdoor heat exchanger 36, and the other is connected to the heat exchanger 5.
are circulated and returned to compressor A. In the outdoor heat exchanger 36 that functions alone as an evaporator during heating operation, for example, the evaporation pressure is 3 Kg/cm ² ,
When the refrigerant is flowing under the evaporation condition with the evaporation temperature -10°C, a large amount of latent heat of evaporation is newly added on the heat exchanger 5 side as described above.
The evaporation conditions change to a pressure of 4 Kg/cm ² and a temperature of over 0°C. At this time, in the outdoor heat exchanger 36, the temperature of the circulating refrigerant becomes higher than the temperature of the frost attached to the surroundings, so the temperature of the circulating liquid refrigerant decreases or the proportion of liquid in the gas-liquid mixed phase increases. It flows through the outdoor heat exchanger 36 while being in a state where the latent heat of condensation is released. Defrosting is performed by sensible heat or latent heat of condensation accompanying the temperature drop of the liquid refrigerant. The liquid refrigerant returned from the outdoor heat exchanger 36 is mixed with the gas refrigerant that evaporated during the flow through the heat exchanger 5 and the suction pipe 3 or the accumulator 4.
When mixed in the compressor A, it absorbs heat and evaporates, or receives compression work inside the compressor A and becomes gasified, and is discharged from the discharge pipe 2. In this way, by bypassing the outdoor heat exchanger 36 and providing evaporation conditions at a higher temperature in the heat exchanger 5, heat radiation from the refrigerant can occur in the outdoor heat exchanger 36, For this reason, indoor heat exchanger 3
The defrosting operation of the outdoor heat exchanger 36 becomes possible while the high-temperature refrigerant is flowing through the outdoor heat exchanger 7, that is, while the heating operation is continued. Note that the aperture 41 is arranged so that the above evaporation conditions can be obtained during the defrost operation.
Flow resistance on the outdoor heat exchanger 36 side and heat exchanger 5
It is configured to have an appropriate flow resistance value based on the heating capacity, etc.

Furthermore, in the refrigerant circuit having the above configuration, the amount of heat stored in the heat storage material 21 can also be utilized to provide immediate warming, for example, at the start of heating operation. That is, as described above, heat is stored in the heat storage material 21 by energizing the heater before the start of operation, or by opening the on-off valve 40 at the start of operation using the amount of heat stored during the previous operation. By heating the refrigerant in the exchanger 5 and transferring this heating heat into the room, even until the refrigerant cycle reaches a stable state at the beginning of operation,
It becomes possible to blow out warm air, improving instant warmth.

FIG. 3 shows a refrigerant circuit diagram in a second application example incorporating the compressor A for a refrigeration system. In the same figure, the same functional parts as those in the first application example shown in FIG. 2 are given the same numbers and the description thereof will be omitted. In the refrigerant circuit of this second application example, one refrigerant piping connection port 1 of the heat exchanger 5
4, a third valve with an on-off valve 47 and a throttle 48 interposed
It is connected to the first liquid pipe 33 by a bypass pipe 45, and the other refrigerant pipe connection port 13 is connected to the suction pipe 3 by a fourth bypass pipe 46. Furthermore, the discharge pipe 2 and the second liquid pipe 35 are connected by a fifth bypass pipe 51 in which an on-off valve 49 and a throttle 50 are interposed.

In the refrigerant circuit of the second application example with the above configuration,
The defrost operation leaves the four-way switching valve 30 in the heating operation cycle and opens the on-off valve 47. At this time, if the on-off valve 49 is kept in the closed state, a refrigerant circulation cycle substantially similar to that in the first application example can be obtained, and similarly to the above, the outdoor heat is External heat radiation can be caused by the refrigerant flowing through the exchanger 36, and as a result, a defrost operation can be performed in the outdoor heat exchanger 36 at the same time as the indoor heating operation. In this circuit, in the parallel connection configuration of the heat exchanger 5 and the outdoor heat exchanger 36, the throttle 48 and the pressure reducing mechanism 34 are installed at the same position, so the flow resistance ratio between them is The splitting ratio of the refrigerant flowing between the heat exchanger 5 side and the outdoor heat exchanger 36 side can be easily set, and therefore the relative capacity ratio adjustment between the defrosting capacity and the heating capacity during defrosting as described above is possible. can be easily determined by adjusting the flow resistance value of the aperture 48. The on-off valve 49 opens when the amount of defrost heat is insufficient. As a result, a portion of the high-temperature gas refrigerant that was flowing from the discharge pipe 2 to the indoor heat exchanger 32 will be directly supplied to the outdoor heat exchanger 36, so the amount of defrost heat increases,
Defrost time can be shortened.

In the refrigerant circuit of the third application example shown in FIG. Therefore, it is connected to the first liquid pipe 33, and the other refrigerant pipe connection port 13 is connected to the second liquid pipe 35 through the seventh bypass pipe 58. When the on-off valve 55 is opened, the liquid refrigerant that radiates heat and condenses through the indoor heat exchanger 32 is partially diverted from the first liquid pipe 33 to the heat exchanger 5 side, where it is heated. and flows into the second liquid pipe 35. As a result, at the inlet of the outdoor heat exchanger 36, liquid refrigerant having a higher temperature than during normal heating operation, that is, a liquid refrigerant in a warm state, flows, and the liquid refrigerant flows while radiating heat to the low-temperature frost. Then, defrosting is performed.

In the refrigerant circuit according to the fourth application example shown in FIG. It is connected to the suction pipe 3 by. As a result, when the same effect as in the third embodiment is performed by opening the on-off valve 55, the flow is further divided from the seventh bypass pipe 57 and a part of the flow is directly returned to the suction pipe 3. This causes an increase in the suction pressure, that is, an increase in the evaporation pressure conditions, so the phase change of the liquid refrigerant flowing through the outdoor heat exchanger 36 to gas is suppressed, and the amount of heat from the hot liquid refrigerant to the frost is reduced. Defrost is performed with guaranteed application direction.

As described above, the compressor A for a refrigeration system in the above embodiment has the heat exchanger 5 disposed around the compressor main body housing 1, so that
The amount of heat that was supposed to be dissipated into the surrounding atmosphere from the main body housing 1, which is in a high temperature operating state during operation, can be effectively utilized by the heat exchanger 5 to heat the circulating refrigerant. can. For this reason, as in each of the above application examples, a bypass circuit adjusted to conditions where the refrigerant flowing through the heat exchanger 5 is in a liquid state, and furthermore, undergoes a phase change,
By providing the heat exchanger 5, it is possible to increase the amount of heat per unit time given from the main casing 1 to the circulating refrigerant, so that, for example, during defrost operation in a separate air conditioner, It is possible to circulate the refrigerant so that the heating operation is continued without a significant decrease in the heating capacity even on the indoor side, and as a result, air conditioning comfort is improved. In addition, as in the above embodiment, the heat exchanger 5
By further disposing a heat storage tank 20 around the main body housing 1 and configuring it to store the amount of heat radiated from the main body housing 1, it becomes possible to utilize the amount of heat radiated more effectively, and the above-mentioned simultaneous heating and defrosting operation ability is improved. Alternatively, it is possible to improve the immediate warming performance when starting the heating operation.

In the above embodiment, the heat exchanger 5 is made of extruded aluminum material, but for example, a copper pipe is coiled and wrapped around the main body housing 1, and the gap is filled with high thermal conductivity adhesive such as silver paste. Other configurations, such as filling with an agent, are also possible. In addition to calcium chloride hexahydrate, the heat storage material shown in the above embodiments may also be made of butyl rubber mixed with paraffin or metal powder. Further, in the above, an example in which the compressor for a refrigeration system of the present invention is applied to an air conditioner has been described, but it is of course possible to apply it to other refrigeration systems.

(Effects of the Invention) As described above, in the compressor for refrigeration equipment of the present invention, by disposing the heat exchanger around the compressor main body housing, in the refrigerant circulation circuit using the heat exchanger, the heat exchanger is disposed around the compressor main body housing. The amount of heat radiated to the outside can be used more effectively to heat the circulating refrigerant, making it possible, for example, to operate defrost and heating simultaneously in a separate air conditioner. Comfort can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view with a partial cross section showing the configuration of a compressor for a refrigeration system in an embodiment of the present invention;
2 to 5 are refrigerant circuit diagrams of an air conditioner to which the apparatus shown in FIG. 1 is applied, and FIG. 6 is a refrigerant circuit diagram of a conventional air conditioner. A... Compressor for refrigeration equipment, 1... Main body housing, 5... Heat exchanger, 13, 14... Refrigerant piping connection ports.

Claims (1)

[Claims] 1. A compressor A for a refrigeration system, which is characterized in that a heat exchanger 5 having refrigerant pipe connection ports 13 and 14 is further disposed around the compressor main body housing 1.