JP3066309B2 - Heat exchanger and heat exchange unit provided with this heat exchanger - 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 this “heat pump type air conditioner” (Japanese Utility Model Publication No. 6-33296). Gazette).

[0003]

Here, the heat exchanger for heating the refrigerant in the boiler has a dedicated chamber for housing the heat exchanger in a housing in which the compressor and the blower are housed. . Therefore, an increase in the size of the housing of the heat exchange unit cannot be avoided. Therefore, an object of the present invention is to reduce the size of a heat exchanger that heats a refrigerant and to suppress an increase in the size of the housing even when the heat exchanger is incorporated in the housing.

[0004]

According to a first aspect of the present invention, there is provided a first heat exchanger as an air heat source and a second heat exchanger which heats a refrigerant by flowing hot water into a rectangular parallelepiped casing.
Wherein the first heat exchanger is disposed along the inside of the surface of the housing, and the second heat exchanger is provided on a column constituting the housing. It is attached so that the second heat exchanger can be accessed when the service panel is removed. According to this second invention,
The first heat exchanger and the second heat exchanger are efficiently housed in this housing.

According to a second aspect of the present invention, there is provided the heat exchange unit according to the first aspect, further comprising a holding member for holding the second heat exchanger by sandwiching the second heat exchanger, and attaching the holding member to a column. 3. According to the second aspect, the heat exchanger is simply and reliably stored in the housing.

[0006]

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an air conditioning system including a heat exchange unit (outdoor unit) according to an embodiment of the present invention.
And two (a plurality of) indoor units 2a and 2b, and a boiler 3
And a circulating pump 4. Reference numeral 5 denotes an inter-unit pipe connecting these units 1, 2a and 2b, and reference numeral 6 denotes a brine pipe provided with a circulation 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. The refrigerant passage 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. The refrigerant heater 24 will be described later.

Reference numeral 30 denotes an inlet pipe for brine (heat source water), that is, an inlet pipe for flowing the brine into the second heat exchanger 24. A plurality of control valves for adjusting the amount of the brine to be poured are provided in parallel. I have. More specifically, the first constant flow valve 31
Means that 7.5 l / min of brine is supplied to the second heat exchanger 2 even if a large amount of brine (hot water) flows from the boiler 3.
The second constant flow valve 32 controls the flow rate of the brine at 4 liters / minute to the second heat exchanger even if a large amount of brine (hot water) flows from the boiler 3. 24. 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. With the opening of the on-off valve 34, brine of 11.5 liter / min flows to the second heat exchanger 24 and the on-off valve 3
Closure of 4 causes 4 l / min of brine to flow to the second heat exchanger 24. 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 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 compression device 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.

FIGS. 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. Ends 46 of these water pipes 45
Are led to the side surface 48 of the valve base 47. This end 4
6 is connected to the brine pipe 6.

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. Here, the above-mentioned propeller fan (omitted in FIG. 6) 41 is connected to the inlet / outlet pipes 26, 2
7 and in front of the water pipe 45. Referring to FIG. 5, reference numeral 50 denotes a large service panel, and 51 denotes a small service panel, both of which are detachably attached to the side of the outdoor unit 1 and both service panels 50 and 51 are removed. FIG. 7 shows the state. 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 components as those shown in FIG. 1 are denoted by the same reference numerals, and their description is omitted. In FIG. 4, the mounting structure of the second heat exchanger 24 is omitted because it will be described later. FIG. 8 is an exploded perspective view of the second heat exchanger 24. Inside the second heat exchanger 24, a number of plates having projections extending in the vertical direction in the figure are formed and many plates are stacked in the vertical direction in the figure. Then, a heat source water passage and a refrigerant passage are formed (not shown) extending in the longitudinal direction, and the heat source water and the refrigerant flow through both passages, so that the refrigerant is heated by the heat of the heat source water. It was made.
Here, 100 is an outlet of the heat source water, 101 is an outlet of the refrigerant, and both outlets are provided on the upper portion of the case 102. 103 is an inlet of the heat source water, 104 is an inlet of the refrigerant, and both inlets are provided at the lower part of the case 102. Therefore, the flow direction of the heat source water and the refrigerant is a so-called “parallel flow” in which the directions flow from bottom to top, as indicated by the dashed arrows. This point is one of the points of the present invention. As shown in FIG. 9, the capacity is improved by 4.7% as compared with the so-called “counterflow” in which the flow directions of the heat source water and the refrigerant are opposite.

Returning to FIG. 8, reference numeral 105 denotes a first heat insulating material.
It is stored in the recess 106 of the second heat exchanger 24. 107
Is a holding member for sandwiching and holding the second heat exchanger 24 in a sandwich shape.
And a second holder 109 having a substantially U-shaped cross section. Outlet portions 100 and 101 and inlet portions 103 and 1
A U-shaped notch 110 for escaping 04 is formed. Also, the width dimension A of the recess 111 of the second holder 109
Is set to be the same as the width B of the second heat exchanger 24. On the other hand, the width dimension C of the first holder 108 is set to be the same as the width dimension D of the second holder 109 including the right mounting piece 112. Reference numeral 120 denotes a second heat insulating material, which is attached to an outer surface of the second holder 109. These two insulation materials 1
At 05 and 120, the heat radiation from the second heat exchanger 24 is reduced.

The method of attaching the holding member 107 thus constructed will be described. First, the concave portion 1 of the second heat exchanger 24
In 06, the first heat insulating material 105 is stored. Then, the second holder 1 is attached to the right side surface of the second heat exchanger 24.
09, and in this state, the left side surface of the second heat exchanger 24 is applied to the first holder 108. Here, the width dimension C of the first holder 108 is the same as the right mounting piece 1 of the second holder 109.
Since the width D is set to be the same as the width D including the second holding tool 10, the left mounting piece 113 of the first holding tool 108
The right mounting piece 116 of the first holder 108 and the right mounting piece 112 of the second holder 109 respectively touch the piece 115 of the 9-cavity portion 114 and are fixed by screws, so that the second heat exchange is performed. The container 24 is held in a sandwich shape by a holding member 107.

FIG. 10 is a perspective view of the outdoor unit 1 showing a state where the large service panel 50 is removed.
The second heat exchanger 24 held in a sandwich shape by
It is attached to a column that forms the housing of the outdoor unit 1. That is, the left mounting piece 116 of the first holder 108 is fixed to the step surface 118 of the support 117 with screws. Thereby, the first heat exchanger 23 of the air heat source is disposed along the inside of the surface of the housing in the rectangular parallelepiped housing, and the second heat exchanger 2 for flowing a fluid such as hot water to heat the refrigerant.
Numeral 4 is attached to a column constituting a housing. By the way, the columns 117 constituting the housing of the outdoor unit 1 are 4
It is composed of books.

[0021]

According to the first invention, a rectangular parallelepiped casing is provided.
It comprises a first heat exchanger of an air heat source and a second heat exchanger for flowing hot water to heat the refrigerant, and a removable service panel is provided, wherein the first heat exchanger is located inside the surface of the housing. And the second heat exchanger is attached to a column constituting the housing, so that the second heat exchanger can be seen when the service panel is removed. Therefore, the first heat exchanger and the second heat exchanger are efficiently stored in this housing.

According to a second aspect of the present invention, there is provided the heat exchange unit according to the first aspect, further comprising a holding member for holding the second heat exchanger by sandwiching the second heat exchanger, and attaching the holding member to a support. . According to the second aspect, the heat exchanger is simply and reliably stored in the housing.

[0023]

[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 an exploded perspective view of a second heat exchanger.

FIG. 9 is an explanatory diagram showing the heat exchange efficiency of the second heat exchanger shown in FIG.

FIG. 10 is a perspective view of the outdoor unit showing a state where a large service panel is removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange unit 23 1st heat exchanger 24 2nd heat exchanger 100, 101 Outlet part 102 Case 103, 104 Inlet part 107 Holding member 117 Post

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

Claims (2)

(57) [Claims] 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 in a rectangular parallelepiped housing, and a detachable service panel is provided.
In vignetting heat exchange unit, the first heat exchanger is disposed along the inner surface of the housing, a second heat exchanger is mounted, et al are the posts constituting the housing, the support
Remove the service panel so that the second heat exchanger can be seen
Heat exchange units, characterized in that the. 2. The heat exchange unit according to claim 1, wherein
Holding to hold the second heat exchanger in a sandwich shape
Having a member and attaching the holding member to the support.
Heat exchange unit according to claim.