JPH0914794A - Refrigerant heater - Google Patents

Abstract

PURPOSE: To reduce in cost and to so improve as to enhance the combustion efficiency and to reduce in weight by simplifying the assembling of a refrigerant heater for heat exchanging combustion gas burnt by a gas burner with refrigerant to feed the heated refrigerant to a compressor to operate heating by simplifying components. CONSTITUTION: The refrigerant heater comprises a burner such as a gas burner provided at the lower part, and a heat exchanger 4 connected to the upper part of the burner to heat refrigerant returned to a compressor in a refrigerant tube provided in the zigzag state of the outer surface by combustion gas passing the inner passage 12. The body case 40 of the exchanger is formed of two split cases 43, 44 which can be connected and assembled by the engaging protrusion 48 and engaging recess 49 of upper end, the inner surface of the case 40 is easily coated with heat resistant film, and the cases 43, 44 can be extrusion molded without warpage to obtain the heater for improving the quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of cooling and heating in which a refrigerant circulating in a refrigerating cycle is heated during heating and flows into an indoor heat exchanger to obtain heating capacity. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant heater for heating the installed refrigerant, and more particularly to an improved structure of a main body of the refrigerant heater.

[0002]

2. Description of the Related Art An air conditioner of this type, which is of a refrigerant heating type and is adapted to perform heating operation, is disclosed in, for example, Japanese Utility Model Publication No.
As shown in Japanese Patent Publication No. 0, a refrigerant heater for heating a refrigerant is provided between an indoor heat exchanger of a refrigeration cycle and an accumulator, and the refrigerant heater is a heating means such as a gas burner or oil. A burner or the like and a refrigerant pipe through which a refrigerant to be heated passes are attached to the surface side, and a passage through which combustion air flows is formed inside, and the heat of combustion is refrigerated by a large number of fins arranged in parallel on the inner surface of the passage. It has a structure including a heat exchanger that is a heat exchange member that is transmitted to the pipe.

FIG. 5 and FIG. 6 show an overall view of a conventional refrigerant heater 10 which is generally used.
Is equipped with a combustion device 2 that accommodates a gas burner 7 or a petroleum burner, which is a heating unit for heating a refrigerant, in an iron casing 6, and a combustion fluid (combustion air) that passes through the interior thereof is provided in an upper part. The heat exchanger 4 heats the refrigerant in the refrigerant tube 3 by heat exchange with the heat exchanger 4).

The combustion device 2 and the heat exchanger 4 are attached to each other with their mounting flanges 19a and 19b in contact with each other, and a packing 20 for preventing combustion fluid leakage is arranged between them, and they are assembled and fixed with bolts and screws. The refrigerant heater 10 is to be assembled. Reference numeral 5 is a blower for combustion that blows air to the combustion device 2. Reference numeral 8 is a connection port of the combustion gas introduction pipe.

The heat exchanger 4 is internally provided with the combustion device 2.
A main body case portion 40B having a duct structure in which a combustion fluid (combustion air) is made to flow in from an opening on the lower surface to flow upward, and a passage 12 is formed so as to be discharged from an exhaust port 11 formed in the head. The main body case portion 40B is composed of the refrigerant pipe 3 which meanders and is attached to the wide front and rear surfaces. In addition, the openings on the left and right side surfaces of the main body case portion 40 will be formed later by the side plates 5.
It becomes a complete duct by being blocked by 0 and 50.

On the outer surface of the main body case portion 40B, a U-shaped pipe support portion 16 for fitting the straight pipe portion 3a of the refrigerant pipe 3 and fixing and fixing the refrigerant pipe 3 is integrally formed. On the other hand, on the other hand, on the inner surface of the passage 12 (see FIG. 7) in the main body case portion 40B through which the combustion fluid (combustion air) passes,
As can be seen from FIG. 7, a large number of heat exchange fins 42 having various protruding lengths are integrally formed in a protruding manner.

The refrigerant pipe 3 has both the refrigerant inlet 17a and the refrigerant outlet 17b located below, the refrigerant inlet 17a is connected to an indoor heat exchanger (not shown) by piping, and the refrigerant outlet 17b is connected to an accumulator (not shown). It is connected. Therefore, when the gas burner 7 is ignited during the heating operation, the metal main body case portion 40 through which the combustion fluid passes.
The heat is transferred to the refrigerant pipe 3 by using B as a heat transfer portion, the refrigerant in the refrigerant pipe 3 is heated, and the heated refrigerant flows into the compressor.

By the way, the main body case portion 40 of the heat exchanger 4
In order to improve the heat exchange performance, B is made of a lightweight aluminum material having good heat conductivity, while the main body case portion 40B
In general, a heat-resistant paint is applied to the inner surface of the body to perform a corrosion resistance treatment for preventing the main body case portion 40B from being exposed to the combustion fluid and being oxidized and corroded for a long period of time.

However, heretofore, this body case portion 40B has been used.
However, as shown in FIG. 7, it was an integral body having a structure of a rectangular tubular case formed by extrusion molding of an aluminum material.

[0010]

Therefore, in the main body case portion of this integrated case structure, it is preferable to apply heat-resistant paint to the inner surface of the main body case portion, which is a narrow cavity and has fins protruding. It is difficult and the work efficiency is extremely poor, and since many fins for heat exchange and the tube support part of the refrigerant tube are integrally formed on the inner and outer surfaces of the main body case, there is a possibility that distortion will occur during processing, There is a problem that the frequency of defective products increases.

The present invention has been made in view of the above problems, and enables the main body case to be assembled by fitting the two-piece case into each other, so that the assembling workability, quality and heat exchange performance can be improved. It aims at providing the refrigerant heater which aimed at.

[0012]

In order to achieve the above object, a refrigerant heater according to claim 1 of the present invention is a refrigerating machine comprising a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger and the like. In a refrigerant heater that is interposed in a cycle and that heats a refrigerant that bypasses the outdoor heat exchanger and an expansion device during heating operation and that circulates into the compressor before the refrigerant is sucked, the refrigerant heater has a burner or the like at the bottom. And a main body case part that also functions as a duct connected to the upper part of the combustion device so as to flow through and discharge the combustion fluid upward, and the combustion fluid inside the main body case part is attached to the outer surface of the main body case part. A heater formed of a refrigerant pipe through which a refrigerant heated by heat exchange with the heater flows, and the main body case portion of the heater is vertically divided into two parts, and the fitting faces are connected to each other on the divided surfaces. A pair of joints One in which was constructed from the case.

A refrigerant heater according to a second aspect is interposed in a refrigeration cycle including a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger, etc., and the outdoor heat exchange is performed during heating operation. In a refrigerant heater that heats the refrigerant that circulates by bypassing the compressor and the expansion device in the stage before it is sucked into the compressor,
The refrigerant heater is equipped with a combustion device such as a burner in the lower part, and a main body case part that also functions as a duct connected to the upper part of the combustion device so as to exhaust the combustion fluid upward and the main body case part. A heater comprising a refrigerant tube attached to the outer surface of the heater and through which a refrigerant heated by heat exchange with a combustion fluid flows, and the main body case portion of the heater is vertically divided into two parts. In addition, each split case is composed of a pair of split cases each provided with a fitting portion for coupling, and each split case has a support portion of the refrigerant pipe on an outer surface side thereof and a heat exchange fin on an inner surface side thereof. It is formed by extrusion molding using an aluminum material as described in 1.

[0014]

According to the structure of claim 1 of the present invention, the main body case portion of the heat exchanger, which is a support for the refrigerant pipe in the refrigerant heater and also serves as a duct portion for passing the combustion fluid,
Since it is composed of two split cases that are vertically divided into two parts and assembled together, the coating process applied to the inner surface of the main body case portion for corrosion resistance is difficult to apply to the inside as in the past. Compared with the case of the main body having the case body structure, it can be performed for each divided case more easily and in detail.

Further, the two divided cases can be easily assembled and formed by simply inserting the coupling fitting portions provided at predetermined positions into the main body case.

Further, according to the second aspect of the present invention, since the main body case portion is composed of two divided cases obtained by extrusion molding with an aluminum material, a case body which is likely to be distorted Compared to the conventional extrusion molding of the main body case, each divided case can be integrally formed with the fins for heat exchange and the supporting portion of the refrigerant pipe necessary for its inner and outer surfaces without causing distortion during molding. The molding die does not have a complicated structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 and also with reference to FIGS.

FIG. 1 is a system diagram of an air conditioner for heating and cooling a room. An indoor unit 21 installed in the room and an outdoor unit 22 installed outdoors are connected by a refrigerant pipe 23. The indoor unit 21 includes an indoor heat exchanger 24 and a blower fan 2 inside.
5 is provided, and the suction port 26 on the front surface is provided by the blower fan 25.
The indoor air sucked from a is heat-exchanged by the heat exchanger 24, and the heat-exchanged air is discharged into the room from the air outlet 26b formed in the lower part.

The outdoor unit 22 has a compressor 27,
The outdoor heat exchanger 28, the expansion device 29, the accumulator 30 as a gas-liquid separation device, the four-way switching valve 31, the refrigerant heater 10, and the like are housed. The four-way switching valve 31 switches between cooling and heating, and serves as a passage indicated by a solid line arrow during cooling, and the refrigerant discharged from the compressor 27 is a four-way switching valve 30 → outdoor heat exchanger 28 → throttle device 29. → Check valve 32
-> Indoor heat exchanger 24-> four-way switching valve 31-> accumulator 30-> a cooling cycle that circulates with the compressor 27 is formed, liquid refrigerant evaporates in the indoor heat exchanger 24 to perform cooling, and at the time of heating. It becomes the passage of the broken line arrow, and the compressor 2
The refrigerant discharged from 7 is the four-way switching valve 31 → the indoor heat exchanger 24 → the solenoid valve 34 of the bypass circuit 33, the refrigerant heater 10.
Refrigerant pipe 3 in the heat exchanger of → → accumulator 30 →
A heating cycle that circulates with the compressor 27 is formed, and the refrigerant heated by the refrigerant heater 10 radiates heat in the indoor heat exchanger 24 to perform heating.

As shown in FIG. 2, a condensing unit including a compressor (not shown), an outdoor heat exchanger, a heat exchanger cooling fan 34, etc. is provided in the main body of the outdoor unit 22. Along with the condensing unit, the refrigerant heater 1
0 is provided.

In the refrigerant heater 10, as shown in FIGS. 5 and 6, the combustor 2 and the heat exchanger 4 constituting the refrigerant heater 10 make their mounting flanges 19a and 19b contact each other, and between them. Arrange packing 20 for preventing combustion fluid leakage,
It is assembled and fixed with bolts and screws.

Here, in the present invention, the main body of the heat exchanger 4 which is one of the constituents of the refrigerant heater 10 is not an integral body having a conventional rectangular tubular case structure as shown in FIG.
As shown in FIGS. 3 and 4, it is assumed that the case is formed by two vertically divided two cases 43 and 44.

That is, as can be understood from the drawings, the divided case 43 is formed with a width B and a length C (which is considerably longer than the width), and a roof portion 47 is formed at the upper end to cover the exhaust top 11A. The divided case 43 has the same width B and vertical dimension C, and is formed by the divided case 44 having the exhaust port 11 formed at the upper end.

The divided cases 43 and 44 are
It is formed by extrusion using an aluminum material as its forming material. Further, in each of the divided cases 43 and 44, a pipe support portion 16 having a fitting groove for attaching the refrigerant pipe 3 in a meandering shape is provided on the surface side of the plate surfaces 43b and 44b which become passage walls of the combustion fluid. A large number of heat exchanging fins 42 having different projecting lengths are integrally formed on the back surfaces of the plate surfaces 43b and 44b at the time of molding.

Further, in order to easily assemble and connect the main body from the two divided cases 43 and 44, a bar-shaped ball is formed at the tip of the roof portion 47 which is the cover of the exhaust top 11A in one divided case 43. The fitting protrusion 48 is formed so as to extend in the width direction. Further, in the other split case 44, a fitting recess 49 for receiving the rod-shaped fitting projection 48 of the split case 43 extends in the width direction at the position of the upper edge of the exhaust port 11. It is shaped.

Therefore, by fitting the fitting projection 48 of the split case 43 into the fitting recess 49 of the split case 44,
The two divided cases 43 and 44 can be surely combined and combined to easily assemble the main body case portion 40 of the heat exchanger 4. In addition, in the embodiment, the case is divided into two pieces at a position directly above the exhaust port 11, but the dividing case is not limited to this. It can be appropriately selected such as divided into two parts, and the fitting protrusion 48 and the fitting recess 49 may be provided in the divided portion.

Thus, after the main body case 40 is assembled,
The openings existing on both sides of the body case 40 are closed by the side plates 50, 50 which are separate members. The side plates 50, 50 are mounted and fixed by tightening mounting screws to a plurality of screw mounting portions 46, 46 formed at the left and right end edges of the split cases 43, 44, respectively. The main body of will be completed.

Thus, the heat exchanger 4 of the refrigerant heater 10
If the main body case portion 40 is composed of two split cases 43 and 44 each having a substantially flat plate shape, a coating film for heat treatment is formed on the inner surface of the passage 12 inside which becomes a passage for the combustion fluid. The work is significantly easier than the case of applying the inside of the main body case portion 40B having the case structure as shown in FIG. 7 of the related art, and it is possible to apply evenly to every corner, thus improving work efficiency. It is possible to provide a refrigerant heater which can be improved in progress and durability.

Also, since the mold may be one in which two simple flat plate-shaped split cases 43 and 44 are manufactured, the cost is low, and the support portion 16 of the refrigerant tube 3 formed at one time and the heat exchange portion are used. Since the number of fins 42 is also small, the frequency with which the extruded split cases 43, 44 are distorted and formed is reduced,
Quality can be improved. Furthermore, two split cases 43, 4
4 is also excellent in terms of assemblability that the main body can be formed without making any work simply by fitting the fitting protrusion 48 and the fitting recess 49 into each other.

[0030]

As described above, according to the first aspect of the present invention, by forming the main body case portion of the heat exchanger of the refrigerant heater by the two substantially flat plate-shaped split cases,
The work of forming a coating for heat-resistant treatment on the inner surface of the passage inside which becomes a passage for the combustion fluid when combined is significantly easier than the case of applying to the main body case part that had a conventional case structure, Moreover, it is possible to obtain a refrigerant heater which can be applied evenly to every corner, which improves work efficiency and improves durability.

Further, since the main body case can be formed only by fitting the fitting portion for connection provided on the split surface between the two divided cases, the heat exchanger can be easily assembled. Further, the heating source of the refrigerant heater is a gas burner,
Regardless of the type and type of oil burner or the like, it is easy to match and assemble the heat source under the assembled heat exchanger.

Further, according to the second aspect of the present invention, since the main body case portion is composed of two divided cases obtained by extrusion-molding the aluminum material, the case body which is likely to be distorted Compared to the conventional extrusion molding of a main body case having a structure, each divided case can be formed without causing distortion during molding, and the necessary heat exchange fins and the support portion of the refrigerant pipe are integrally formed on the inner and outer surfaces thereof. In addition, the molding die does not have a complicated structure, and the manufacturing cost can be reduced.

[0033]

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner including a refrigerant heater.

FIG. 2 is a front view of an outdoor heat exchanger equipped with the refrigerant heater of the present invention.

FIG. 3 is an external perspective view of a heat exchanger body case portion in a refrigerant heater including two split cases of the present invention.

FIG. 4 is an exploded perspective view of the heat exchanger body case portion.

FIG. 5 is a front view of the refrigerant heater.

FIG. 6 is a side view of the refrigerant heater.

FIG. 7 is an external perspective view of a heat exchanger body case portion having a conventional integrally formed case structure.

[Explanation of symbols]

 2 Combustion device 3 Refrigerant tube 4 Heat exchanger 7 Burner 10 Refrigerant heater 11 Exhaust port 16 Tube support section 40B, 40 Main body case section 42 Fins 43, 44 Split case 48 Fitting protrusion 49 Fitting concave section

Claims (2)

[Claims] 1. A refrigeration cycle comprising a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger, etc., and circulates while bypassing the outdoor heat exchanger and the expansion device during heating operation. In a refrigerant heater for heating the refrigerant in a stage before being sucked into a compressor, the refrigerant heater is equipped with a combustion device such as a burner in a lower portion thereof, and a combustion fluid is exhausted to an upper portion of the combustion device by flowing the combustion fluid upward. A heat exchanger composed of a main body case portion that also serves as a duct continuously connected to the main body case, and a refrigerant pipe that is attached to the outer surface of the main body case portion and through which a refrigerant that is heated by heat exchange with a combustion fluid flows A refrigerant heater characterized in that the main body case portion of the heat exchanger is constituted by a pair of split cases that are vertically split into two and provided with fitting portions for coupling on their split surfaces. 2. A refrigeration cycle comprising a compressor, an outdoor heat exchanger, an expansion device, an indoor heat exchanger, etc., and circulates while bypassing the outdoor heat exchanger and the expansion device during heating operation. In a refrigerant heater for heating the refrigerant in a stage before being sucked into a compressor, the refrigerant heater is equipped with a combustion device such as a burner in a lower portion thereof, and a combustion fluid is exhausted to an upper portion of the combustion device by flowing the combustion fluid upward. A heat exchanger composed of a main body case portion that also serves as a duct continuously connected to the main body case, and a refrigerant pipe that is attached to the outer surface of the main body case portion and through which a refrigerant that is heated by heat exchange with a combustion fluid flows The main body case portion of this heat exchanger is constituted by a pair of split cases that are vertically divided into two and provided with coupling fitting portions on their split surfaces, and each split case is on the outer surface side thereof. Inside the support part of the refrigerant pipe Refrigerant heating device, characterized in that formed by extrusion molding by aluminum material to have a fin for heat exchanger integrally in the side.