JPH02251052A - Compressor for refrigerator - Google Patents

Abstract

PURPOSE:To simplify a structure by holding the state of fins for heat transferring from a region isolated from a compressor body housing to a heat accumulation material by utilizing a heat transfer refrigerant pipe. CONSTITUTION:A heat exchanger 9 is composed of many fins 7,...,7 made of square aluminum thin plates so aligned that a whole shape becomes a rectangular parallelepiped, and a refrigerant pipe 8 made of a plurality of straight tubes passing laterally and U-shaped tube for connecting the ends of the tubes protruding externally from both right and left end fins 7, 7. Such a plate fin type heat exchanger is so composed as to be bent in curvature along the circumference concentric with the outer periphery of the cylindrical sidewall of a housing 2, and provided at the outer periphery of the sidewall of the housing 2. Heat from a region isolated from the housing 2 to a heat accumulation material 12 is transferred via the fins of the exchanger 9. The fins are held in the state by refrigerant tubes for heat transferring. Accordingly, a fin structure for heat transfer is not necessarily manufactured with special specifications.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a compressor for a refrigeration system having a heat storage function capable of improving defrosting performance and the like.

(Prior Art) As a conventional example of the above-mentioned compressor for a refrigeration system, there can be mentioned, for example, a device described in Japanese Patent Application Laid-Open No. 62-26465. FIG. 5 shows a longitudinal cross-sectional view of the compressor.
For example, it is stored in a heat storage tank 42. And the heat storage tank 4
2 is filled with a heat storage material 43 such as paraffin,
The amount of heat radiated to the surroundings from the compressor main body 41, which reaches a high temperature state during operation, is stored in the heat storage material 43. The gas refrigerant discharged from the discharge pipe 44 of the compressor main body 41 is heated by this stored heat amount, raising the temperature to a higher temperature, and the refrigerant flowing back to the compressor main body 41 through the suction pipe 45 is heated. evaporation is promoted.

In this way, the amount of stored heat is further added to the refrigerant circulating through the compressor main body 41, thereby increasing the amount of heat held by the circulating refrigerant, thereby improving the defrosting performance, for example.

(Problem to be Solved by the Invention) However, the heat storage materials described above generally have low thermal conductivity and are substances with a relatively large viscosity coefficient in liquid form, so they are difficult to cause thermal convection, and therefore do not cause heat convection as described above. In order to effectively store the amount of heat radiated from the compressor body 41 throughout the heat storage material 43 filled in the heat storage tank 42, as shown in FIG.
It is necessary to provide a large number of heat transfer fins 46 . . . 46 extending radially into the heat storage material 43 from the outer wall surface of the heat storage material 43 .

In the above device, these heat transfer fins 46...46
is directly planted on the outer peripheral surface of the compressor main body 41,
There is a problem in that manufacturing the compressor main body 41 with such a special housing structure increases manufacturing costs. It is also conceivable to create a heat transfer fin unit separately from the compressor body 41 and arrange it around the outer periphery of the compressor body, but in this case as well, a large number of thin plates are arranged at predetermined intervals. The heat transfer fin unit that is constructed by installing the heat transfer fins must be specially manufactured to match the outer circumferential shape of the compressor main body, which increases the manufacturing cost. A problem arises in that a special mounting structure is required for maintenance and fixation, making the configuration complicated.

Furthermore, since the heat storage material 43 described above is easily oxidized and deteriorated at high temperatures, the heat storage layer 42 is configured as a closed container, and the entire internal space is designed to prevent air from remaining in the heat storage layer 42. However, in this case, excessive pressure is generated within the heat storage layer 42 due to thermal expansion of the heat storage material 43 when the temperature becomes high.
Therefore, there is a problem that sufficient safety cannot be ensured due to the risk of damage.

This invention was made in view of the above, and its purpose is to make it possible to manufacture the product at a lower cost, simplify the structure, prevent deterioration of the heat storage material, and improve safety. An object of the present invention is to provide a compressor for refrigeration equipment.

(Means for Solving the Problem) Therefore, the compressor for a refrigeration system according to the first aspect of the present invention has a plate-fin type heat exchanger curved along a circumference substantially concentric with the outer circumference of the compressor main body housing 2. 9 is disposed on the outer periphery of the compressor main body housing 2, and both 2.9 are sealed with an external casing 11, and a heat storage material 12 is injected into the space created between the compressor main body housing 2 and the external casing 11. are doing.

Further, in the compressor for a refrigeration system according to a second aspect of the present invention, in the compressor according to the first aspect, the plate-fin type heat exchanger 9 is connected to both end plates 14 and 15 of the outer casing 11 facing each other in the axial direction. and the axial length of the plate-fin type heat exchanger 9 before installation is slightly larger than the distance between the end plates 14 and 15,
The plate fin type heat exchanger 9 is connected to the both end plates 14.1.
5 to be clamped in the axial direction.

Furthermore, in the compressor for a refrigeration system according to the third aspect, in the compressor according to the first or second aspect, after the heat storage material 12 is injected into the heat injection boat bored in the outer casing 11, Safety valve 16 is installed.

Further, the compressor for a refrigeration apparatus according to a fourth aspect includes the first,
In the compressor according to the second or third claim, an unfilled space is formed by injecting the heat storage material 12 into a volume smaller than the space volume generated between the compressor main body housing 2 and the outer casing 11. There is.

Further, in the compressor for a refrigeration system according to a fifth aspect of the present invention, in the compressor according to the fourth aspect, the unfilled space is made into a non-oxidizing atmosphere.

Further, in the compressor for a refrigeration system according to the sixth aspect, in the compressor according to the fourth or fifth aspect, a deoxidizing agent is further added to the space created between the compressor main body housing 2 and the outer casing 11. Injecting.

(Function) In the compressor for a refrigeration system according to the first aspect, the heat transfer to the heat storage material 12 in the area away from the compressor main body housing 2 is performed by the fins in the plate-fin type heat exchanger 9; The shape of each fin is maintained by refrigerant piping for heat transfer. Therefore, there is no need to manufacture the fin structure for heat transfer with special specifications, so it can be manufactured at a lower cost.

Furthermore, in the compressor for a refrigeration system according to the second aspect, the plate-fin type heat exchanger 9 is sandwiched between the both end plates 14, 15 of the outer casing 11, and therefore does not require any metal fittings or the like for fixing it. , the configuration is simple.

Furthermore, in the compressor for a refrigeration system according to the third aspect, the heat storage material injection boat also serves as a hole in which the safety valve 16 is installed, so that the number of the safety valves 16 is reduced, and the sealing plug of the heat storage material injection port is Since it is no longer necessary, production costs are reduced.

In addition, in the compressor for a refrigeration system according to the fourth aspect, an increase in volume due to thermal expansion of heat storage + J'12 is allowed within the volume of the unfilled space, so that excessive pressure does not act on the outer casing 11. This improves safety.

Furthermore, in the compressor for a refrigeration system according to the fifth aspect, since the unfilled space is provided with a non-oxidizing atmosphere, deterioration of the heat storage material 12 due to oxidation is prevented.

Further, in the compressor for a refrigeration system according to the sixth aspect, since the amount of oxygen remaining in the outer casing 11 is reduced and removed by the deoxidizing agent, deterioration of the heat storage material 12 due to oxidation is prevented.

(Example) Next, a specific example of the pressure wJ machine for refrigeration equipment of the present invention will be described in detail with reference to the drawings.

The second part shows a vertical cross-section of a compressor for a refrigeration system in an embodiment of the present invention. A machine body housing (hereinafter abbreviated as housing), this housing 2 has a cylindrical side wall part, and
A suction pipe 3 is connected to the bottom side of this side wall, and a discharge pipe 4 is connected to the top end. The above suction pipe 3 is L
An accumulator 6 is interposed in a vertical portion 5 which is bent into a letter shape and extends upward parallel to the axis of the housing 2 .

Figure 3(a) shows a normal plate-fin heat exchanger installed in the indoor unit or outdoor unit of an air conditioner.
This heat exchanger has a large number of fins 7 made of rectangular thin aluminum plates arranged in parallel so that the overall shape is a rectangular parallelepiped.
7, a plurality of straight pipes passing through these fins 7 in the left and right direction, and a U-shaped pipe that interconnects the ends of the straight pipes protruding outward from the fins 7 and 7 at both left and right ends. and a refrigerant pipe 8 consisting of. As shown in FIG. 3(b), such a plate fin type heat exchanger is constructed by curving the plate fin type heat exchanger with a curvature along a circumference concentric with the outer periphery of the cylindrical side wall portion of the housing 2. A heat exchanger (hereinafter abbreviated as heat exchanger) 9 is installed around the outer periphery of the cylindrical side wall of the housing 2, as shown in FIG. 1, which is a sectional view taken along the line I-1 in FIG. ing. In this case, the pitch between each fin 7.7 is configured to be 2 to 6 pitches. In addition, since the accumulator 6 is located close to the outer periphery of the housing 2, the heat exchanger 9 is arranged so as to avoid positional interference with the accumulator 6, as shown in FIG. Fins at both ends 7.
It has a partially cylindrical shape with an opening angle between 7 and 40 to 90 degrees.

As shown in FIGS. 1 and 2, the compressor main body 1 surrounding the heat exchanger 9 is housed in the outer casing 11, and the space created between the outer casing 11 and the housing 2 is An amount that substantially immerses the entire heat exchanger 9 in the heat exchanger 9.
A compressor for a refrigeration system is constructed by injecting a heat storage material 12 made of, for example, polyethylene glycol. As shown in FIG. 1, the external casing 11 has an egg-shaped cross section, and the accumulator 6 is also accommodated therein.

In the above, the heat radiated to the surroundings from the compressor main body 1, which becomes in a high temperature state during operation, is also transferred to the heat storage material 12 in the area away from the housing 2 by the fins 7 of the heat exchanger 9. Therefore, heat is stored effectively throughout the heat storage material 12.

In the above configuration, the fin structure for heat transfer is constructed by curving a general plate-fin type heat exchanger along the outer periphery of the cylindrical side wall of the housing 2, and it is necessary to manufacture it with special specifications. Since there is no such thing, it is possible to reduce the production cost.

In addition, in the above configuration, each fin 7...7 has a support structure that is maintained at a predetermined pitch by the refrigerant pipe 8. Therefore, when configuring a separate fin unit, a special support structure for each fin is required. The configuration is simpler than that in the case of , and this also makes it possible to reduce the manufacturing cost.

Furthermore, since the refrigerant pipe 8 is provided, by creating a circuit configuration that can control the flow of refrigerant to the refrigerant pipe 8, it becomes possible 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. In addition, when recovering the heat stored in the refrigerant flowing through the refrigerant pipe 8, each fin 7 functions as a heat transfer fin, so that heat is quickly recovered, which also makes the refrigeration system more efficient. can be configured.

(2) Furthermore, in the configuration described in (g), since the accumulator 6 is also immersed in the heat storage material 12, the amount of stored heat is imparted to the accumulator 6, and therefore the evaporation of the liquid refrigerant in the accumulator 6 is promoted. Liquid accumulation is reduced.

In the above, the compressor main body 1 and the heat exchanger 9 are entirely housed in the outer casing 11, but only the heat exchanger 9 is covered with an airtight container and a heat storage material is injected inside. It is also conceivable to provide the housing 2 with the following. However, in this case, an air layer exists between the housing 2 and the closed container, resulting in a decrease in heat transfer efficiency. In this regard, since the above configuration has a structure in which no air layer is present, more efficient heat storage can be performed.

Next, the characteristic detailed structure of the compressor for a refrigeration system will be explained.

First, as shown in FIG. 2, the external casing 11 includes a side wall 13 having an oval cross section, one end plate covering the bottom of the side wall 13, that is, a bottom plate 14, and the other end plate covering the top of the side wall 13. It is composed of an end plate, that is, an upper lid 15, and the bottom plate 14 has an engagement hole into which a step-like protruding surface on the axis side extending from the lower end surface of the main body housing 2 is fitted, and the upper lid 15 has an engagement hole into which a stepped protruding surface on the shaft center side that extends from the lower end surface of the main body housing 2 is fitted, and the upper lid 15 has The upper side of the main body 1 is formed with through holes that project upward, and the compressor main body 1 is positioned within the outer casing 11 by these engagement holes and the through holes.

Furthermore, the heat exchanger 9 is sandwiched between the bottom plate 14 and the top cover 15 in the axial direction, but the axial length of the heat exchanger 9 before installation is defined as the distance between the bottom plate 14 and the top cover 15. The distance between the clamping surfaces is set to be slightly larger than the distance between the clamping surfaces indicated by L in FIG.

Therefore, the compressor main body 1 with the heat exchanger 9 surrounding it is placed on the bottom plate 14 to which the side wall 13 is fixed, and then the upper M15 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 upper and lower ends of the fins 7.
It is clamped in the axial direction by the upper M15 and the upper M15, providing a fixed installation that does not cause rattling. In this way, when the top cover 15 is attached, the heat exchanger 9 is also fixed at the same time, making the assembly work easy, and since there is no need for metal fittings or the like for fixing, the configuration becomes simpler. There is.

Note that by configuring the inner circumferential side of the heat exchanger 9 to be in contact with the housing 2, it is possible to quickly transfer the amount of radiated heat to the heat storage material 12 on the outer circumferential side. By configuring the heat exchanger 9 to be spaced apart from each other, it is easy to assemble the heat exchanger 9 to the main body 1 due to the pressure of the heat exchanger 9. In this case, the above-mentioned separation dimension is set so as not to generate an excessive temperature gradient in the heat storage material 12 in the region between the inner periphery of the heat exchanger 9 and the housing 2.

On the other hand, a distance is provided between the outer peripheral side of the heat exchanger 9 and the outer casing 11 so that an appropriate temperature gradient is generated in the heat storage material 12 in this area. In other words, the heat storage material 12 in this region functions as a heat insulating material against heat transfer to the outer casing 11, thereby suppressing a rise in temperature of the outer casing 11.

Next, a characteristic configuration regarding the heat storage material 12 will be explained.

For example, the heat storage material 12 made of polyethylene glycol etc. is easily oxidized and deteriorated at high temperatures. It has a sealed structure that prevents the infiltration of water. In this case, in a configuration in which the internal space is filled with the heat storage material 12, the heat storage material 12
Since there is a risk of damage to the outer casing 11 due to thermal expansion when the outer casing 11 and the housing 2 reach high temperature,
The injection amount of the heat storage material 12 is made slightly smaller than the internal space volume between the two to leave an unfilled space on the upper side, and a safety valve 16, which will be described later, is attached to the upper lid 15.
Further, the air in the unfilled space is deaerated or replaced with nitrogen to create a non-oxidizing atmosphere. As a result, damage to the outer casing 11 due to thermal expansion of the heat storage material 12,
And deterioration of the heat storage material 12 is prevented. In addition, the heat storage material 1
By further mixing a deoxidizing agent into the heat storage material 12, the aging of the heat storage material 12 is further reduced, and the initial heat storage capacity can be maintained over a long period of time.

The safety valve 16 is located at the upper 1f as shown in FIG.
15, but this safety valve 16 was installed before.
The heat storage material 12 is injected through the mounting hole of the safety valve 16, and after the injection operation is completed, the safety valve 16 is inserted into the mounting hole.
The above mounting hole also serves as a heat storage material injection boat. Therefore, a dedicated hole for injecting the heat storage agent and its sealing plug are not required, and the number of through holes in the upper lid 15 is reduced (thereby, the reliability as a closed container is improved).

Next, an application example of the compressor for a refrigeration system having the above configuration will be described.

FIG. 4 shows a refrigerant circuit diagram of an air conditioner as an example. In the figure, A is a compressor for a refrigeration system having the above configuration, and the discharge pipe 4 and suction pipe 3 are respectively connected to the four-way switching valve 21, and 20 the four-way switching valve 2
1, the first gas pipe 22, the indoor heat exchanger 23, the first
A liquid pipe 24, an electric expansion valve 25, a second liquid pipe 26, an outdoor heat exchanger 27, and a second gas pipe 28 are connected to form a refrigerant circulation circuit. Furthermore, a solenoid valve 2 is provided in the first liquid pipe 24.
9 interposed bypass outgoing pipe 3o is connected to the second liquid pipe 26, and a bypass returning pipe 31 is connected to the second liquid pipe 26.
These bypass outgoing pipe 3o and bypass returning pipe 31 form a refrigerant pipe 8 extending from a heat exchanger 9 in a compressor A for a refrigeration system.
．． 8 respectively. The outdoor heat exchanger 27 is provided with an outdoor fan 32 in the form of a propeller fan, and the indoor heat exchanger 23 is provided with an indoor fan 33 in the form of a cross-flow fan.

In the above device, the four-way switching valve 21 is located at the switching position shown by the solid line in the figure, the solenoid valve 29 is closed, and the gas refrigerant discharged from the compressor main body 1 is transferred from the indoor heat exchanger 23 to the electric expansion valve 2.
5 to the outdoor heat exchanger 27. During this heating operation, the compressor body reaches a high temperature, and the heat dissipated from the housing 2 to the surroundings is transferred to the heat storage material 12. heat is stored inside.

In the defrosting operation to remove frost that has grown on the outdoor heat exchanger 27 during the heating operation, the solenoid valve 29 of the bypass outgoing pipe 30 is opened, and the outdoor fan 3
This is done by stopping step 2. At this time, the compressor body 1
The discharged gas refrigerant is condensed in the indoor heat exchanger 23, and the heat of condensation released at that time continues to heat the room. Next, from the first liquid pipe 24 to the bypass outgoing pipe 30
At this time, the amount of heat stored in the heat storage material 12 is imparted to the circulating refrigerant, causing an increase in the amount of heat held in the refrigerant, resulting in a gas-liquid mixed phase with an increased proportion of the gas phase. The liquid then flows into the outdoor heat exchanger 27 from 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 to which frost has adhered, so that the sensible heat based on the temperature difference and the latent heat due to the condensation of the gas phase components are transferred to the outdoor heat exchanger 27. It is applied and defrosting progresses. In this way, by the cycle in which the amount of heat stored in the heat storage material 12 is used as an auxiliary heat source in addition to the compression work in the compressor main body 1, the amount of heat held in the circulating refrigerant increases, and as a result, as described above, the amount of heat stored in the indoor side increases. It is possible to perform heating and defrosting at the same time, and it is possible to perform operation with improved air conditioning comfort.

(Effects of the Invention) As described above, in the compressor for a refrigeration system according to the first claim of the present invention, the shape of the fins for transferring heat to the heat storage material in a region remote from the machine body housing is maintained at a pressure of 1. Since this is done using refrigerant piping for heat transfer, there is no need to manufacture the structure with special specifications (,
Therefore, it can be manufactured at a lower cost.

Further, in the compressor for a refrigeration system according to the second aspect, the play I/fin type heat exchanger is fixed by the end plate of the outer casing, and therefore there is no need to separately provide metal fittings for fixing the heat exchanger. becomes simple.

Furthermore, in the compressor for a refrigeration system according to the third aspect, the heat storage material injection boat and the mounting hole of the safety valve are formed of the same hole, so the number of holes is reduced and a sealing plug of the heat storage material injection boat is not required. Therefore, production costs are reduced.

Furthermore, in the compressor for a refrigeration system according to the fourth aspect, since the unfilled space is provided, an increase in volume due to thermal expansion of the heat storage material is allowed, so that excessive pressure does not act on the outer casing. This improves safety.

Further, in the compressor for a refrigeration system according to the fifth aspect, since the unfilled space is provided with a non-oxidizing atmosphere, deterioration of the heat storage material due to oxidation is prevented.

Further, in the compressor for a refrigeration system according to the sixth aspect, since the amount of residual oxygen in the outer casing is reduced and removed by the deoxidizing agent, deterioration of the heat storage material due to oxidation is prevented.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the main structure of a compressor for refrigeration equipment according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the compressor for refrigeration equipment, and FIG. FIG. 3(b) is a perspective view of the plate-fin type heat exchanger, and FIG.
The figure shows a refrigerant circuit of an air conditioner constructed by incorporating the compressor for a refrigeration system, and FIG. 5 shows a cross-sectional diagram of a conventional compressor having a heat storage tank. Pletonoid heat exchanger, 11...external casing, 1
2... Heat storage material, 14... Bottom plate (end plate), 15...
Upper cover (end plate), 16...safety valve.

Claims (1)

[Claims] 1. A plate-fin heat exchanger (9) curved along a circumference substantially concentric with the outer periphery of the compressor main body housing (2) is arranged on the outer periphery of the compressor main body housing (2). At the same time, both (2) and (9) are sealed with an outer casing (11), and a heat storage material (12) is injected into the space created between the compressor main body housing (2) and the outer casing (11). A compressor for refrigeration equipment characterized by: 2. The plate-fin type heat exchanger (9) is connected to both axially opposing end plates (
14) and (15), and the axial length of the plate-fin type heat exchanger (9) before installation is slightly larger than the distance between the end plates (14) and (15). The plate fin type heat exchanger (9) is attached to the above both end plates (
14) A compressor for a refrigeration system according to claim 1, wherein the compressor is configured to be held in the axial direction by (15). 3. Refrigeration according to claim 1 or 2, characterized in that a safety valve (16) is attached to the heat storage material injection port bored in the external casing (11) after the heat storage material (12) is injected. Compressor for equipment. 4. The heat storage material (12) is smaller than the space volume created between the compressor main body housing (2) and the outer casing (11).
3. A compressor for a refrigeration system according to claim 1, wherein the unfilled space is formed by reducing the amount of injection. 5. The compressor for a refrigeration system according to claim 4, wherein the unfilled space is in a non-oxidizing atmosphere. 6. Compression for refrigeration equipment according to claim 4 or 5, characterized in that a deoxidizing agent is further injected into the space created between the compressor main body housing (2) and the outer casing (11). Machine.