JP3066307B2 - Heat exchange unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange unit having a first heat exchanger of an air heat source and a second heat exchanger for heating a refrigerant in a single housing.

[0002]

2. Description of the Related Art In a cold region such as Hokkaido, a so-called "heat pump type air conditioner" using an air heat source for heating may not provide a sufficient heating effect. Therefore, there has been proposed an air conditioner (heat exchange unit) in which a device that heats a refrigerant with a boiler or the like and serves as a heat source for heating is incorporated in the “heat pump type air conditioner” (Japanese Patent Publication No. 6-50752). Gazette).

[0003] Accordingly, a connector for a refrigerant pipe extending from the first heat exchanger of the air heat source and a second heat exchanger for flowing a fluid such as hot water to heat the refrigerant are provided on the exterior surface of the heat exchange unit. And a water pipe connector extending therefrom.

[0004]

As described above, since a plurality of connectors with different types of fluids are arranged on the outer surface of the heat exchange unit, the outer surface has a complicated structure and cost increases. I couldn't help. In view of the above, an object of the present invention is to simplify the structure and suppress an increase in cost when a plurality of connectors having different types of fluid are arranged on the exterior surface of the heat exchange unit.

[0005]

[0006]

[0007]

According to a first aspect of the present invention, a first heat exchanger as an air heat source and a second heat exchanger for flowing hot water to heat a refrigerant are provided. In the heat exchange unit housed in the body, one panel constituting the exterior body of the housing has a cross section L composed of a vertical plane and a horizontal plane.
It has a shape in which a connector for a refrigerant pipe extending from the first heat exchanger and a connector for a hot water pipe extending from the second heat exchanger are individually attached to respective surfaces. is there.
According to the first invention, one panel to which the connector for the refrigerant pipe extending from the first heat exchanger and the connector for the hot water pipe extending from the second heat exchanger are attached has an L-shaped cross section. As a result, the strength of the panel can be increased and the structure can be simplified.

According to a second aspect of the present invention, in the heat exchange unit according to the first aspect, at least one surface of one panel having an L-shaped cross section is formed with a hole through which a connector is inserted and temporarily fixed, and The connector is provided with a detachment preventing device for preventing the connecting device from coming off the temporarily fixed state. According to the second aspect, the connector extending from the heat exchanger is securely fixed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an air conditioning system provided with a heat exchange unit according to an embodiment of the present invention. The equipment of this system includes one outdoor unit 1 and two (multiple) units.
, Indoor units 2a and 2b, a boiler 3, and a circulation pump 4. 5 indicates these units 1, 2a, 2b
And 6 is a brine pipe provided with a circulating pump 7.

The indoor units 2a and 2b include an indoor heat exchanger (not shown), a temperature sensor (not shown) for detecting the temperature (condensation temperature) of the indoor heat exchanger during heating, and indoor air conditioning. Indoor sensors 7a and 7b for detecting a load are arranged respectively. The boiler 3 has a built-in heater (not shown) for heating the brine, and the heated brine flows as indicated by a solid line arrow by the operation of the circulation pump 4.

The outdoor unit 1 has the following devices built therein. 8 is a compression device, which is connected in parallel 2
It is composed of two compressors 9a and 9b. Here, the compressor 9a is of a constant horsepower type of 6 horsepower, and the compressor 9b is of a variable horsepower type of 4 horsepower. Reference numeral 10 denotes a high-pressure pipe which is connected to the compressor 9b and has a high-pressure on-off valve 11. The high-pressure pipe 10 is configured to open the high-pressure on-off valve 11 to apply a high pressure in the refrigeration cycle to the compressor 9b to set a capacity of 4 horsepower. .

A low pressure on-off valve 13 is also connected to a compressor 9b.
The low-pressure pipe is provided with a low-pressure pipe which applies a low-pressure pressure during the refrigeration cycle to the compressor 9b by opening the low-pressure on-off valve 13 to set the capacity to 2 horsepower. Reference numeral 14 denotes an oil separator, which is provided in the discharge pipe 15 and the separated oil is returned to the suction pipe 17 of the compressor 9b via the oil pipe 16. Reference numeral 18 denotes a bypass pipe provided with a bypass valve 19, and the suction pipe 2 in front of the discharge pipe 15 and the accumulator 20.
Connected to 1. By opening the bypass valve 19, the refrigerant on the high pressure side in the refrigeration cycle is returned to the low pressure side in the refrigeration cycle, thereby reducing the capacity of the compression device 8 to one.
It reduces horsepower. Reference numeral 22 denotes a four-way valve, which is set to a dashed state during heating and set to a solid line during cooling.

Reference numeral 23 denotes an outdoor heat exchanger. Reference numeral 24 denotes a refrigerant heater (second heat exchanger) which heats the refrigerant with warm water from the boiler 3 during a heating operation without using a heat pump. An inlet pipe 26 of a refrigerant pipe 25 of the refrigerant heater 24 is connected to a high-pressure pipe 28 of the refrigeration cycle via an on-off valve 27, and an outlet pipe 29 is connected to a suction pipe 21 in front of the accumulator 20. Reference numerals 100 and 101 denote service valves (connectors) which connect the refrigerant pipes in the outdoor unit 1 to the inter-unit piping 5 from the indoor units 2a and 2b.

Reference numeral 30 denotes an inlet pipe for brine, that is, an inlet pipe for flowing a fluid to the second heat exchanger 24, and a control valve (first and second constant flow valves 3) for adjusting the amount of the fluid to be poured.
1, 32) are provided in parallel. 33 is an outlet pipe of the brine. Reference numeral 34 denotes an opening / closing valve provided on the outlet side of the second constant flow valve 32, the opening / closing of which is controlled by an air conditioning load. The open / close state of the open / close valve 34 is set as shown in FIG. 3 according to the number of operating indoor units and the condensation temperature of the refrigerant in the indoor heat exchanger of the indoor unit being operated. Reference numerals 102 and 103 denote connectors for connecting the water pipe 45 in the outdoor unit 1 and the brine pipe 6 from the boiler 3.

Reference numeral 35 denotes a controller of the air conditioning system.
The operating horsepower as the air conditioning system is set by inputting signals from the temperature sensors of the indoor units 2a and 2b and the indoor sensors 7a and 7b. Depending on this set driving horsepower,
By setting the capacity of the compressor 8 as shown in FIG. 2 and setting the open / close state of the bypass valve 19 of the bypass pipe 18, the capacity is set in increments of one horsepower.

Here, during the cooling operation, the refrigerant discharged from the compressor 8 flows as shown by the solid arrow in FIG. 1, and the indoor heat exchanger acts as an evaporator. At this time, the on-off valve 36 of the high-pressure pipe 28 is set to the fully open state, and the on-off valve 27 is set to the fully closed state, and the use of the second heat exchanger 24 is stopped. On the other hand, during the heating operation, the refrigerant discharged from the compression device 8 flows as indicated by a broken arrow in FIG. 1, and the indoor heat exchanger acts as a condenser. At this time, if the outside air temperature is equal to or higher than the predetermined temperature and a sufficient heating capacity is obtained even with the heat pump operation, the controller 3
When the determination at 5 is made, the open / close valve 36 is set to the fully open state and the open / close valve 27 is set to the fully closed state, as in the cooling operation, and the use of the second heat exchanger 24 is stopped. However, when the outside air temperature is equal to or lower than the predetermined temperature and the controller 35 determines that a sufficient heating capacity cannot be obtained by the heat pump operation, the on-off valve 36 is set to a fully closed state and the on-off valve 27 is set to a fully open state. Then, the boiler 3 and the circulation pump 4 are operated to transfer hot water to the heat exchanger 2.
4 to heat the refrigerant.

4 to 7 show the outdoor unit 1. FIG. 4 is a plan view, FIG. 5 is an elevation view, and FIG. 6 shows a propeller fan (to be described later) and an internal structure of the unit. FIG. 7 is a plan view of the machine room 39 in which the compression device 8 is housed, with the upper plate removed, and FIG. Referring to FIG. 4, the outdoor unit 1 has a substantially rectangular parallelepiped shape, and a blowing grill 40 is attached to an upper surface thereof. Then, a propeller fan (blower) 4 arranged at the center of the upper part in the outdoor unit 1
In operation 1, the outside air is supplied to the three side surfaces 42 of the outdoor unit 1.
From the outlet grill 40. The first heat exchanger 23 of the air heat source is arranged so as to open at least one around the blower 41. The second heat exchanger 24 for flowing a fluid such as hot water to heat the refrigerant
Is arranged in an extra space 43 formed by the first heat exchanger 23 and the blower 41.

Referring to FIG. 6, a water pipe 45 (brine inlet pipe 30,
The outlet pipe 33) is arranged along the opening 44 as shown in FIG. The connector 10 for these water pipes 45
2 and 103 are guided to a vertical surface 105 of the valve base 47. The vertical surface 105 of the valve base 47 is a single panel constituting an exterior body of the housing of the heat exchange unit 1. The above-mentioned service valves (connecting tools) 100 and 101 are attached to the horizontal surface 104 of the valve base 47, and this portion is the gist of the present invention. On the other hand, the inlet pipe 26 and the outlet pipe 27 of the refrigerant pipe 25 connected to the second heat exchanger 24 are connected to the first heat exchanger 23.
Are arranged halfway along a piece 49 of a substantially U-shaped cross section.

Referring to FIG. 5, reference numeral 50 denotes a large service panel, and 51 denotes a small service panel, all of which are detachably attached to the side of the outdoor unit 1.
FIG. 7 shows a state where both service panels 50 and 51 are removed. In particular, when the large service panel 50 is removed, the electrical equipment plate 52 is disposed across the water pipe 45 provided with the two constant flow valves 31 and 32 and the front of the machine room 39.

In FIGS. 4 to 7, the same devices as those shown in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. 8 to 11 show the valve base 47 and devices related to the valve base 47. FIG. 8 is a perspective view showing the relationship between the valve base 47, the connection tools 102 and 103, and the disengagement prevention tool 106, and FIG. 10 is a plan view of the stopper 106, FIG. 11 is an elevation view of the stopper 106, FIG. 12 is a plan view of the valve base 47, and FIG. 13 is an elevation view of the valve base 47. is there.

Referring to FIG. 8, reference numeral 107 denotes a hexagonal hole provided in the vertical surface 105 of the valve base 47. Is inserted and temporarily fixed. The detachment prevention device 106 is formed by bending a single sheet metal and has a lower portion cut out in a substantially U-shape. And detachment prevention tool 1
06 down along the vertical surface 105,
The notch 120 of the disconnection preventing device 106 is
3 fits into the groove 109, and
3 is prevented from deviating from the temporarily fixed state. FIG. 9 is a cross-sectional view of a main part in this state.
9 has a width A of 3.6 mm, a thickness B of the turn-back portion of the slip-off preventing device 106 of 4.0 mm, and a thickness C (one piece) at the tip of the slip-off preventing device 106 of 2.0 mm. Therefore, by attaching the detachment preventing device 106 to the vertical surface 105, the width dimension A of the groove 109 of the connecting devices 102 and 103 is reduced.
06, the thickness of the groove 109
A space 110 is formed in the connector 10 from the vertical surface 105.
The hexagonal portion 108 on the back side of 2, 103 is prevented from coming off.

Referring to FIGS. 12 and 13, the valve base 47 is formed such that the rear side 111 and the lower side 112 are open, and the horizontal plane 106 adjacent to the vertical plane 105 has two cutouts 113. Are formed. These two notches 1
13 is a service valve (connecting device) 100, 10
1 is to be attached. The service valves (connectors) 100 and 101 connect the refrigerant pipe in the outdoor unit 1 and the interunit piping 5 from the indoor units 2a and 2b. Reference numeral 114 denotes a flange piece for fixing the valve base 47 to the bottom of the outdoor unit 1.

As described above, the service valves (connectors) 100 and 101 are placed on the horizontal surface 106 of the valve
When the connectors 102 and 103 are attached to the connector 05, the connecting portions (connection ports) 115 of the connectors 100, 101, 102 and 103 are all in the same direction (downward in FIG. 6, frontward in FIG. 7). Direction), and the arrangement directions of the interunit piping 5 and the brine piping 6 connected to these connection portions (connection ports) 115 are the same as shown in FIG.

[0024]

[0025]

[0026]

According to a first aspect of the present invention, there is provided a heat exchange unit in which a first heat exchanger serving as an air heat source and a second heat exchanger for flowing hot water and heating a refrigerant are housed. One panel constituting the exterior body has an L-shaped cross section including a vertical surface and a horizontal surface, and each surface has a connector for a refrigerant pipe extending from the first heat exchanger and the (2) A hot water pipe connecting device extending from the heat exchanger is individually attached. Therefore, it is possible to increase the strength of the panel to which a plurality of sets of connecting tools are attached and to simplify the structure, and to suppress the cost of the outdoor unit.

According to a second aspect of the present invention, in the heat exchange unit according to the first aspect, at least one surface of one panel having an L-shaped cross section is formed with a hole through which a connector is inserted and temporarily fixed, and The connector is provided with a detachment preventing device for preventing the connecting device from coming off the temporarily fixed state. According to the second aspect, the connector extending from the heat exchanger can be securely fixed.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioning system including a heat exchange unit of the present invention.

FIG. 2 is an explanatory diagram showing an operation state of the compression device shown in FIG.

FIG. 3 is an explanatory diagram showing an open / closed state of the on-off valve shown in FIG. 1;

FIG. 4 is a plan view of the heat exchange unit of the present invention.

FIG. 5 is an elevation view of the heat exchange unit.

FIG. 6 is a plan view showing the internal structure of the heat exchange unit.

FIG. 7 is an elevation view showing the internal structure of the heat exchange unit.

FIG. 8 is a perspective view showing a relationship between a valve base, a connection tool, and a disconnection prevention tool of the heat exchange unit of the present invention.

FIG. 9 is a sectional view of a main part of FIG.

FIG. 10 is a plan view of the detachment prevention device shown in FIG.

FIG. 11 is a sectional view taken along line 11-11 of FIG. 10;

FIG. 12 is a plan view of the valve base shown in FIG. 8;

FIG. 13 is an elevational view of this valve base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange unit 23 1st heat exchanger 24 2nd heat exchanger 47 Valve stand (panel) 100, 101, 102, 103 Connector 106 Disconnection prevention tool 107 hole

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F24F 5/00

Claims (2)

(57) [Claims] 1. A heat exchange unit in which a first heat exchanger as an air heat source and a second heat exchanger into which warm water is poured to heat a refrigerant are housed in a housing, and an exterior body of the housing is formed.
One panel has an L-shaped cross section consisting of a vertical surface and a horizontal surface.
And on each side, from the first heat exchanger
The extended refrigerant pipe connector and the temperature extended from the second heat exchanger.
A heat exchange unit characterized in that water pipe connectors are individually attached . 2. The heat exchange unit according to claim 1,
And at least one surface of one panel having an L-shaped cross section,
A hole for temporarily fixing the connecting device is formed, and
Detachment prevention device that prevents the connection device from coming off the temporarily fixed state
Heat exchange units, comprising the.