JP2503637B2 - Refrigerator compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a compressor for a refrigerating apparatus having a heat storage function capable of improving defrosting performance and the like.

(Prior Art) As a conventional example of the compressor for the refrigerating apparatus as described above, for example, an apparatus described in JP-A-62-26465 can be cited. FIG. 5 shows a vertical sectional view thereof, in which 41 is a compressor body, and the compressor body 41 is housed in a heat storage tank 42. The heat storage tank 42 is filled with a heat storage material 43 such as paraffin, and the amount of heat dissipated to the surroundings from the compressor body 41, which is in a high temperature state during operation, is stored in the heat storage material 43. This heat storage heats the gas refrigerant discharged from the discharge pipe 44 of the compressor main body 41 to heat it to a higher temperature, and also adds the refrigerant returned to the compressor main body 41 through the suction pipe 45. The temperature is increased and evaporation is accelerated. Thus, the amount of heat accumulated in the circulating refrigerant is increased by further imparting the heat storage amount to the refrigerant circulating through the compressor main body 41, whereby the defrosting performance is improved, for example.

(Problems to be Solved by the Invention) By the way, the heat storage material as described above generally has a small thermal conductivity and is hard to generate thermal convection because it is a substance having a relatively large viscosity coefficient in a liquid state. In order to effectively store the amount of heat dissipated from the compressor body 41 over the entire heat storage material 43 filled in the heat storage tank 42, as shown in FIG. A large number of heat transfer fins extending radially from the outer wall surface of 41 into the heat storage material 43.
It is necessary to provide 46 ... 46. In the above device, these heat transfer fins 46, ... 46 are directly planted on the outer peripheral surface of the compressor body 41, and are manufactured by manufacturing the compressor body 41 with such a special housing structure. There is the problem of high costs. It is also possible to form a unit of heat transfer fins separately from the compressor body 41 and arrange the unit on the outer periphery of the compressor body, but in this case also, a number of thin plates are arranged at a predetermined interval. Since it is necessary to specially manufacture the heat transfer fin unit configured by installing it according to the outer peripheral shape of the compressor main body, the manufacturing cost also increases, and each heat transfer fin is arranged at a predetermined interval. There is also a problem that a special mounting structure is required to maintain and fix the structure, which complicates the configuration.

Therefore, as described in, for example, Japanese Patent Laid-Open No. 63-169457, a heat exchanger is arranged inside a pack-shaped heat storage tank in which a heat storage material is enclosed, and this heat storage tank is provided on the outer periphery of the compressor body housing. However, in this case, the existence of an air layer between the heat storage tank and the compressor body housing is unavoidable, and the heat dissipated from the compressor body housing does not pass through the heat storage material. If it is not, it is difficult to maintain good heat transfer characteristics due to the fact that heat cannot be transferred to the plate fins of the heat exchanger.

Further, since the heat storage material 43 as described above is easily oxidized and deteriorated at a high temperature, the heat storage tank 42 is configured as a closed container, and air is not left in the heat storage tank 42.
Although it is configured to fill the heat storage material 43 in the entire internal space,
In this case, the thermal expansion of the heat storage material 43 when the temperature becomes high causes an excessive pressure in the heat storage tank 42, which may cause damage and may not ensure sufficient safety.

The present invention has been made in view of the above, and an object thereof is to manufacture it at a lower cost while maintaining good heat conduction characteristics, to simplify the structure, and to prevent deterioration of the heat storage material. It is possible to provide a compressor for a refrigerating apparatus which has improved safety.

(Means for Solving the Problem) Therefore, the compressor for a refrigerating apparatus according to the first aspect of the present invention is a plate fin type heat exchanger curved along a circumference substantially concentric with the outer circumference of the compressor body housing 2. 9 fins 7
The inner peripheral end portion of the compressor body housing 2 is in direct contact with the outer peripheral portion of the compressor body housing 2, and both 2 and 9 are sealed with an outer casing 11, and the compressor body housing 2 and the outer casing 11 are sealed. Heat storage material in the space created between
Injecting 12.

A compressor for a refrigerating apparatus according to a second aspect is the first aspect described above.
The compressor according to claim 1, wherein the plate fin type heat exchanger 9 is located between both end plates 14 and 15 of the outer casing 11 which are axially opposed to each other, and before the plate fin type heat exchanger 9 is assembled. The axial length of the plate fin type heat exchanger 9 is set to be slightly larger than the separation distance between the both end plates 14 and 15 so that the plate fin type heat exchanger 9 is axially sandwiched between the both end plates 14 and 15.

A compressor for a refrigerating apparatus according to a third aspect is the first aspect described above.
Alternatively, in the compressor according to the second aspect, a safety valve 16 is attached to the heat storage material injection port formed in the outer casing 11 after the heat storage material 12 is injected.

A compressor for a refrigerating apparatus according to a fourth aspect is the compressor according to the first, second or third aspect, in which a space volume generated between the compressor body housing 2 and the outer casing 11 is Also forms the end filling space by reducing the injection amount of the heat storage material 12.

The compressor for a refrigerating apparatus according to a fifth aspect is the fourth aspect.
In the compressor according to the present invention, the unfilled space is made into an atmosphere containing less oxygen than the atmosphere by degassing treatment, nitrogen substitution, or the like.

(Operation) In the compressor for the refrigeration apparatus according to the first aspect,
The heat radiated from the compressor body housing 2 is transferred to the heat storage material 12 mainly through the plate-shaped fins of the heat exchanger 9, so that good heat transfer characteristics can be maintained, and each The shape of the fins is maintained by the refrigerant pipes for heat transfer. Therefore, since it is not necessary to manufacture the fin structure for heat transfer with a special specification, the fin structure can be manufactured at a lower cost.

Further, in the compressor for a refrigerating apparatus according to the second aspect,
The plate fin type heat exchanger 9 is sandwiched by the both end plates 14 and 15 of the outer casing 11, and therefore no metal fittings or the like for fixed attachment are required, so that the structure is simplified.

Moreover, in the compressor for a refrigerating apparatus according to claim 3,
Since the heat storage material injection port also functions as a mounting hole for the safety valve 16, the number of holes is reduced and the sealing plug of the heat storage material injection port is not required, so that the manufacturing cost is reduced.

Moreover, in the compressor for a refrigerating apparatus according to claim 4,
Since the volume increase due to the thermal expansion of the heat storage material 12 is allowed within the volume range of the unfilled space, an excessive pressure does not act on the outer casing 11, and the safety is improved.

Moreover, in the compressor for a refrigerating apparatus according to claim 5,
Since the unfilled space is made into an atmosphere containing less oxygen than the atmosphere by degassing, nitrogen substitution, etc., deterioration of the heat storage material 12 due to oxidation is prevented.

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

FIG. 2 shows a vertical sectional view of a compressor for a refrigerating apparatus according to an embodiment of the present invention. In FIG. 2, 1 is a compressor body and 2 is a compressor constituting an outer wall surface of the compressor body 1. A main body housing (hereinafter abbreviated as a housing), the housing 2 has a cylindrical side wall portion, and a suction pipe 3 is connected to a bottom portion side of the side wall portion.
Further, the discharge pipe 4 is connected to the upper end portion. Above suction pipe 3
Is bent in an L-shape, and an accumulator 6 is provided in a vertical portion 5 extending upward in parallel with the axis of the housing 2.

FIG. 3 (a) shows a normal plate fin type heat exchanger installed in an indoor unit or an outdoor unit of an air conditioner. The heat exchanger is arranged in parallel so that the whole shape is a rectangular parallelepiped. A large number of fins 7 ··· 7 formed of rectangular aluminum thin plates provided, a plurality of straight pipes penetrating these fins 7 ··· 7 in the left-right direction, and the fins 7 · 7 at the left and right ends protruding outward. The refrigerant pipe 8 includes a U-shaped pipe that connects the ends of the straight pipes to each other. And, as shown in FIG. 3 (b), such a plate fin type heat exchanger is formed by curving with a curvature along a circumference concentric with the outer circumference of the cylindrical side wall portion of the housing 2. The heat exchanger (hereinafter abbreviated as heat exchanger) 9 is
As shown in FIG. 1 which is a sectional view taken along the line I-I in the figure,
The inner end portions of the respective fins 7 are circumferentially provided so as to be in direct contact with the outer peripheral portion of the cylindrical side wall portion of the housing 2. In this case, the pitch between the fins 7 is set to 2 to 6 mm. Further, since the accumulator 6 is located close to the outer periphery of the housing 2, the heat exchanger 9 is arranged as shown in FIG. 3 (b) so as not to cause positional interference with the accumulator 6. Fins 7 and 7 at both ends
It has a partially cylindrical shape with an opening angle of 40 to 90 degrees.

As shown in FIGS. 1 and 2, the compressor main body 1 around which the heat exchanger 9 is provided is housed in an outer casing 11, and a space formed between the outer casing 11 and the housing 2 is provided. , A heat storage material 12 made of, for example, polyethylene glycol or the like in such an amount that the entire heat exchanger 9 is substantially immersed
To form a compressor for the refrigeration system. As shown in FIG. 1, the outer casing 11 has an oval cross-section and is configured to accommodate the accumulator 6 therein.

In the above, the heat dissipated to the surroundings from the compressor main body 1 which is in a high temperature state during operation is transferred to the heat storage material 12 in the region away from the housing 2 by the fins 7 ... Of the heat exchanger 9. Therefore, heat storage over the entire heat storage material 12 is effectively performed. In the above structure, the fin structure for heat transfer is formed by bending a general plate fin type heat exchanger along the outer periphery of the cylindrical side wall portion of the housing 2, and it is necessary to manufacture it with special specifications. Therefore, the manufacturing cost can be reduced.

Further, in the above-mentioned configuration, each fin 7 ... Has a supporting structure that is maintained at a predetermined pitch by the refrigerant pipe 8. Therefore, when separately forming a fin unit, a special supporting structure for each fin is required. The structure is simpler than that of the above case, and the manufacturing cost can be reduced by this as well.

Further, by providing the refrigerant pipe 8, a circuit configuration that can control the flow of the refrigerant to the refrigerant pipe 8 can be used to control the heat storage period and the heat storage recovery period separately, as described later. As a result, the heat storage function can be utilized more effectively. Also, the refrigerant pipe 8
Even when recovering the amount of heat stored in the refrigerant flowing through the heat exchangers, each fin 7 ... Works as a heat transfer fin, so that quick heat recovery is performed, and a more efficient refrigerating device can be configured. it can.

Further, in the above-described configuration, since the accumulator 6 is also immersed in the heat storage material 12, the amount of heat storage heat is given to the accumulator 6, and therefore the evaporation of the liquid refrigerant in the accumulator 6 is promoted, and the liquid pool is formed. Will be reduced.

When only the heat exchanger 9 is covered with a hermetically sealed container, a heat storage material is injected into the inside, and the heat storage material is provided around the housing 2,
Since the air layer is present between the housing 2 and the closed container, the heat transfer efficiency is reduced. In this respect, since the above-described configuration does not cause the air layer to intervene, more efficient heat storage can be performed.

Next, the characteristic detailed configuration of the compressor for the refrigeration system will be described. First, as shown in FIG. 2, the outer casing 11 includes a side wall 13 having an oval cross section and the side wall 13 as described above.
One end plate that covers the bottom of the base plate, that is, the bottom plate 14 and the side wall
It is composed of the other end plate that covers the upper part of 13, that is, the upper lid 15, and the bottom plate 14 has an engaging hole into which the stepped projecting surface on the axial center side of the lower end surface of the main body housing 2 fits. Each of the through-holes 15 is formed in the upper part of the compressor body 1 so as to project upward, and the engaging hole and the through-hole allow the compressor body 1 to be positioned in the outer casing 11. Has been done.

Further, the heat exchanger 9 is sandwiched in the axial direction by the bottom plate 14 and the upper lid 15, and the axial length before the heat exchanger 9 is assembled is between the bottom plate 14 and the upper lid 15. Second
It is slightly larger than the distance between the sandwiching surfaces indicated by L in the figure. Therefore, the compressor body 1 around which the heat exchanger 9 is mounted is placed on the bottom plate 14 to which the side wall 13 is fixed, and then the upper lid 15 is fixed to the upper end of the side wall 13 to form the outer casing 11 as a closed container. When assembling the heat exchanger 9
The fins 7 ... In the assembled state in which the upper and lower ends of the fins 7 are slightly deformed, whereby the heat exchanger 9 is attached to the bottom plate.
It is axially clamped by 14 and the top lid 15 to provide a fixed mounting without rattling. As described above, when the upper lid 15 is attached, the heat exchanger 9 is fixed at the same time, and therefore, the assembling work is easy, and the metal fittings for fixing are not required. Therefore, the structure is simpler. There is.

By configuring the inner peripheral side of the heat exchanger 9 so as to be in direct contact with the housing 2, it becomes possible to quickly transfer the amount of heat dissipated to the heat storage material 12 on the outer peripheral side. Between the outer peripheral side of the heat exchanger 9 and the outer casing 11, the heat storage material 12 in this region is provided.
The space is provided so that an appropriate temperature gradient can be obtained. That is, the heat storage material 12 in this region functions as a heat insulating material against heat transfer to the outer casing 11, and thereby suppresses the temperature rise of the outer casing 11.

Next, a characteristic configuration of the heat storage material 12 will be described. For example, since the heat storage material 12 made of polyethylene glycol or the like is easily oxidized and deteriorated at a high temperature, a phenol-based or toluene-based heat-resistant additive is mixed in the heat storage material 12, and the outer casing 11 is connected to the outside air. It has a closed structure that blocks the intrusion of. In this case, in the configuration in which the internal space is filled with the heat storage material 12, thermal expansion when the heat storage material 12 is in a high temperature state causes the outer casing 11
Therefore, in the above device, the amount of the heat storage material 12 injected is slightly smaller than the internal space volume between the outer casing 11 and the housing 2 so that the upper space is not filled. Leave the parts and cover 15
Further, a safety valve 16 described later is attached, and air in the unfilled space is degassed or replaced with nitrogen to create an atmosphere containing less oxygen than the atmosphere. This allows the heat storage material
Damage to outer casing 11 due to expansion heat of 12 and heat storage material
12 deterioration is prevented. Further, by further mixing a deoxidizing agent in the heat storage material 12, the secular change of the heat storage material 12 is further reduced, and the initial heat storage capacity can be maintained for a long period of time.

The safety valve 16 has an upper lid 15 as shown in FIG.
The heat storage material 12 is injected through the mounting hole of the safety valve 16 before the safety valve 16 is mounted, and after the injection operation is completed, the safety valve 16 is mounted in the mounting hole. It also functions as a heat storage material injection port. Therefore, the dedicated hole for injecting the heat storage material and its sealing plug are not necessary, and the number of through holes in the upper lid 15 is reduced, so that the reliability as a sealed container is improved.

Next, application examples of the compressor for a refrigerating apparatus having the above-described structure will be described. FIG. 4 shows a refrigerant circuit diagram of an air conditioner as an example thereof, in which A is a compressor for a refrigerating apparatus having the above-mentioned configuration, and the discharge pipe 4 and the suction pipe 3 are respectively It is connected to the four-way switching valve 21, and to the four-way switching valve 21, a first gas pipe 22, an indoor heat exchanger 23,
First liquid pipe 24, electric expansion valve 25, second liquid pipe 26, outdoor heat exchanger
27 and the second gas pipe 28 are connected to form a refrigerant circulation circuit. Further, the first liquid pipe 24 is connected with a bypass forward pipe 30 in which an electromagnetic valve 29 is interposed, and the second liquid pipe 26 is connected with a bypass return pipe 31. And the bypass return pipe 31 are connected to the refrigerant pipes 8 and 8 extending from the heat exchanger 9 in the compressor A for the refrigeration system, respectively. The outdoor heat exchanger 27 is provided with a propeller fan type outdoor fin 32, and the indoor heat exchanger 23 is provided with a cross flow fan type indoor fin 33.

In the above device, the four-way switching valve 21 is positioned at the switching position shown by the solid line in the figure, and the electromagnetic valve 29 is closed to close the compressor body 1
Discharge gas pipe refrigerant from the indoor heat exchanger 23 to the electric expansion valve
Heating operation is performed by circulating the heat to the outdoor heat exchanger 27 through 25. During this heating operation, the compressor body 1 is in a high temperature state, and the heat dissipated from the housing 2 to the surroundings is the heat storage material 12 described above. The heat is stored inside.

And the defrosting operation for removing the frost adhering to and growing on the outdoor heat exchanger 27 while the upper air heating operation is continued, the solenoid valve 29 of the bypass outward pipe 30 is opened from the above, and the outdoor fan 32 is stopped. By doing. At this time, the gas refrigerant discharged from the compressor main body 1 is condensed in the indoor heat exchanger 23, and therefore the indoor heat is continued by the condensation heat released at that time. Then, the heat is circulated in the heat exchanger 9 from the first liquid pipe 24 through the bypass forward pipe 30, and the amount of heat stored in the heat storage material 12 at this time is imparted to the circulating refrigerant to increase the amount of heat retained in the refrigerant. The gas-liquid mixed phase having an increased phase ratio flows into the outdoor heat exchanger 27 through the bypass return pipe 31 and the second liquid pipe 26.
The temperature of the inflowing refrigerant at this time is sufficiently higher than that of the outdoor heat exchanger 27 with frost, and therefore the sensible heat based on the temperature difference and the latent heat due to the condensation of the gas phase component are the upper outdoor heat exchanger 27. Is applied to the defrosting process. In this way, in addition to the compression work in the compressor body 1, a cycle in which the amount of heat stored in the upper air heat storage material 12 is used as an auxiliary heat source increases the amount of heat retained in the circulating refrigerant, and as a result, as described above, It is possible to perform heating on the inside and defrosting at the same time, and it is possible to achieve operation with improved air conditioning comfort.

(Effect of the invention) As described above, in the compressor for a refrigerating apparatus according to the first aspect of the present invention, the shape of the fin for transferring heat to the heat storage material in the region away from the compressor body housing is maintained. Since it is said that it uses refrigerant piping for transferring, it is not necessary to manufacture its structure with special specifications,
Therefore, it is possible to manufacture at low cost while maintaining good heat transfer characteristics.

Further, in the compressor for a refrigerating apparatus according to the second aspect,
The plate fin type heat exchanger is fixed by the end plate of the outer casing, and therefore, it is not necessary to separately provide a metal fitting or the like for fixed attachment, so that the configuration is simplified.

Moreover, in the compressor for a refrigerating apparatus according to claim 3,
Since the heat storage material injection port and the safety valve mounting hole are formed by the same hole, the number of holes is reduced, and the sealing plug of the heat storage material injection port is not required, so that the manufacturing cost is reduced.

Moreover, in the compressor for a refrigerating apparatus according to claim 4,
Since the unfilled space is provided, the volume increase due to the thermal expansion of the heat storage material is allowed, so that an excessive pressure does not act on the outer casing, and the safety is improved.

Moreover, in the compressor for a refrigerating apparatus according to claim 5,
Since the unfilled space is made into an atmosphere containing less oxygen than the atmosphere by degassing, nitrogen substitution, etc., deterioration of the heat storage material due to oxidation is prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of the essential parts of a compressor for a refrigerating machine according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the compressor for a refrigerating machine, and FIG. FIG. 3 (b) is a perspective view of the plate fin type heat exchanger, FIG. 3 (b) is a perspective view of the plate fin type heat exchanger in the compressor for the refrigerating apparatus, and FIG.
FIG. 5 is a refrigerant circuit diagram of an air conditioner configured by incorporating the compressor for the refrigeration system, and FIG. 5 is a schematic sectional view of a compressor having a conventional heat storage tank. 2 ... Compressor body housing, 9 ... Plate fin type heat exchanger, 11 ... External casing, 12 ... Heat storage material, 14 ...
… Bottom plate (end plate), 15… Top cover (end plate), 16… Safety valve.

Claims (5)

(57) [Claims] 1. An inner peripheral end portion of each fin (7) of a plate fin type heat exchanger (9) curved along a circumference substantially concentric with the outer circumference of a compressor body housing (2) is provided with the compressor. The main housing (2) is arranged so as to be in direct contact with the outer peripheral portion of the main housing (2), and both (2) and (9) are placed in the outer casing (11)
And a heat storage material (12) in the space formed between the compressor body housing (2) and the outer casing (11).
A compressor for a refrigerating apparatus, which is characterized by injecting. 2. The plate fin type heat exchanger (9),
The outer casing (11) is positioned between the end plates (14) (15) facing each other in the axial direction, and the axial length before the plate fin heat exchanger (9) is assembled is set to the end plates (14). A little larger than the separation distance between (15),
Replace the plate fin type heat exchanger (9) with the both end plates (1
4) The compressor for a refrigerating apparatus according to claim 1, wherein the compressor is configured to be sandwiched in the axial direction by (15). 3. A safety valve (16) after the heat storage material (12) is injected into the heat storage material injection port formed in the outer casing (11).
A compressor for a refrigerating apparatus according to claim 1 or 2, wherein the compressor is attached. 4. An unfilled space is formed by making the injection amount of the heat storage material (12) smaller than the space volume generated between the compressor body housing (2) and the outer casing (11). The compressor for a refrigerating apparatus according to claim 1, 2, or 3. 5. The compressor for a refrigerating apparatus according to claim 4, wherein the unfilled space is made into an atmosphere containing less oxygen than the atmosphere by degassing treatment, nitrogen substitution or the like.