JPH0623806U - Heat exchanger for heat pump type air conditioner - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a heat exchanger of a heat pump type air conditioner, which uses a multi-flow heat exchanger and sufficiently exhibits a predetermined function as both an evaporator and a condenser. [Constitution] A check valve is provided on a partition plate provided on a header pipe of a multi-flow heat exchanger. [Effect] According to the switching of the flow of the heat exchanged fluid of the heat pump type air conditioner, it is possible to provide a multi-pass type or one-pass type heat exchanger that can always be used as an evaporator or a condenser with high heat exchange efficiency.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a heat exchanger used in a heat pump type air conditioner.

[0002]

[Prior art]

 In recent air conditioners for automobiles, multi-flow heat exchangers have come to be used in order to satisfy the demands for miniaturization and higher performance. As shown in FIGS. 6 and 7, the multi-flow heat exchanger comprises first and second header pipes 1 and 2 which are installed in parallel with each other with a predetermined distance therebetween and are erected substantially vertically in the direction of gravity. The first and second conduits 3 and 4 into and out of which the heat exchange fluid flows are attached to the second pipe 2, and a large number of flat pipes 5 are provided between the header pipes 1 and 2, and the flat pipes 5 are connected to each other. A heat transfer fin 7 (commonly called a corrugated fin) is interposed to form a heat exchange core 8 as a whole (see, for example, Japanese Utility Model Laid-Open No. 2-28,986). There are so-called one-pass type and multi-pass type multi-flow heat exchangers. In the former, for example, as shown by an arrow in FIG. The first header pipe 1 is provided with a partition plate (not shown) in the first or second header pipes 1 and 2, so that the first header pipe 1 and the second header pipe 2 collectively flow. The heat exchange fluid flowing from the to the second header pipe 2 flows while making a U-turn in the core portion 8.

The one-pass multi-flow heat exchanger has a high flow velocity of the heat exchanged fluid and can exhibit high performance as a condenser for condensing the heat exchanged fluid in a high-pressure and high-temperature gas state. Compared to the one-pass type, the pass-type multi-flow heat exchanger has a longer flow path for the fluid to be heat-exchanged, and therefore, when it achieves a predetermined heat exchange performance, The shape can be made smaller.

[0004]

[Problems to be solved by the device]

 However, there are various problems in using such a multi-flow heat exchanger exhibiting high performance as a heat exchanger in a heat pump type air conditioner.

Here, as is well known, the heat pump type air conditioner is an apparatus for cooling and heating the inside of a room by switching between a cooling cycle and a heating cycle, and heat exchangers are provided inside and outside the room. When one functions as a capacitor, the other functions as an evaporator. Therefore, the heat exchanger used in this heat pump type air conditioner must function not only as a condenser, but also as an evaporator.

If the one-pass type multi-flow heat exchanger is used to perform the function not only as the condenser but also as the evaporator, the flow velocity of the refrigerant in the flat tube 5 is high, and the heat exchange is performed. Since the fluid easily condenses, it functions well as a condenser, but not as an evaporator. Further, if the multi-pass type multi-flow heat exchanger is used, the flow velocity of the refrigerant in the flat tube 5 will be slowed down to some extent, and it will function relatively sufficiently as an evaporator, but the heat exchanged fluid will not easily condense. Therefore, it is not preferable as a capacitor.

The present invention has been made in view of the above problems, and uses a multi-flow type heat exchanger, and a heat pump type air conditioner that sufficiently exhibits a predetermined function as both an evaporator and a condenser. It is intended to provide a heat exchanger.

[0008]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention comprises a first header pipe having a first conduit and a second header pipe having a second conduit, which are arranged in parallel with each other with a predetermined distance therebetween. In a heat pump type air conditioner equipped with a multi-flow heat exchanger in which a header pipe is connected by a large number of flat tubes and a core is formed by attaching heat transfer fins between these flat tubes during a cooling cycle, One or a plurality of first partition plates are provided on the downstream side of the first conduit of the first header pipe, and one or a plurality of second partition plates are provided on the upstream side of the second conduit of the second header pipe. Each of these first and second partition plates is closed when the heat exchanged fluid is circulated from the first conduit to the second conduit, and conversely the heat exchanged fluid is supplied from the second conduit to the first conduit. Reverse when opening for circulation A heat exchanger of the heat pump type air conditioner which is characterized in that a valve.

[0009]

[Action]

 In the present invention, first, when the heat exchange fluid is circulated from the first conduit to the second conduit, the check valves provided on the partition plates of the first header pipe and the second header pipe are closed, The heat exchanged fluid flows while making a U-turn in the core, and the heat exchanger becomes a multi-pass type, which can be suitably used as an evaporator. Next, when the heat exchanged fluid flows from the second conduit to the first conduit, the check valve is opened, and the heat exchanged fluid is allowed to flow in the header pipe without being partitioned by the partition plate. Then, the heat exchanger collectively flows from one header pipe to the other header pipe, and the heat exchanger becomes a one-pass type, and can be suitably used as a condenser.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a heat exchanger of a heat pump type air conditioner according to an embodiment of the present invention, showing a state in which the heat exchanger is used as an evaporator, and FIG. 2 shows a case where the heat exchanger is used as a capacitor. FIG. 3 is a plan view of the check valve, FIG. 4 is a side view of the same, and FIG. 5 is a cross-sectional view showing a mounting state of the check valve. Are denoted by the same reference numerals.

1, 2 and 3, the heat exchanger of the present embodiment has first and second header pipes 1 and 2 which are spaced apart by a predetermined length and are arranged in parallel. The header pipes 1 and 2 are made of aluminum, and both ends thereof are closed by a lid 40. The first header pipe 1 is attached with a first conduit 3 through which the heat exchanged fluid flows in and out, and the second header pipe 2 is attached with a second conduit 4 through which the heat exchanged fluid flows in and out. A large number of flat tubes 5 are provided between the header pipes 1 and 2, and heat transfer fins 7 are attached between the flat tubes 5 to form a core portion 8 for heat exchange as a whole.

The first header pipe 1 has one first partition plate 21 downstream of the first conduit 3, and the second header pipe 1 has one second partition plate 21 upstream of the second conduit 4. A partition plate 23 is provided, and check valves 22 and 24 are provided on the partition plates 21 and 23, respectively. As shown in FIGS. 3 to 5, each of the check valves 22 and 24 is provided with a valve element 32 for opening and closing a through hole 31 formed in each of the partition plates 21 and 22. The end portions of the divided header pipes 1 and 2 are fitted into annular fitting grooves 28 and 29 formed on the upper and lower surfaces of 22, so that the partition plates 21 and 22 are sandwiched between the header pipes 1 and 2. There is.

The through holes 31 of the partition plates 21 and 22 are opened and expanded in a tapered shape toward the upstream side, and the valve element 32 is shaped so as to be closely fitted to the tapered through holes 31. A hole 33 is formed on the upper surface of the valve body 32, and a guide pin 34 is inserted into the hole 33. The guide pin 34 is fixed to the frame 35 fixed to the partition plates 21 and 22 and hangs down to smoothly move the valve body 32 up and down. A coil spring is provided between the valve body 32 and the frame body 35. 36 is provided, and the coil spring 36 constantly urges the valve element 32 in a direction to close the through hole 31. Therefore, the valve body 32 blocks the heat exchanged fluid flowing down from the upstream side (upper side in FIG. 5) and allows the heat exchanged fluid flowing upward from the downstream side (lower side in FIG. 5) to flow. It will be. The partition plates 22 and 24, the valve body 32, the frame body 36, and the like are preferably made of aluminum. The operation when the heat exchanger thus configured is incorporated in the cycle of the heat pump type air conditioner will be described.

When the heat pump type air conditioner is operated in the cooling mode, the heat exchanger functions as an evaporator. In this case, the heat-exchanged fluid (liquefied refrigerant) that flows in from the condenser via the expansion valve flows in from the first conduit 3 as shown in FIG. The liquefied refrigerant flowing from the first conduit 3 flows down in the first header pipe 1, but is blocked by the check valve 21 provided in the first partition plate 21, and the liquefied refrigerant on the upstream side of the first partition plate 21 is blocked. It flows into the second header pipe 2 through the flat pipe 5. Since this refrigerant has a small flow area determined by the number of the flat tubes 5, the flow rate is limited, the flow velocity is also suppressed, and the refrigerant efficiently evaporates by exchanging heat with the air flowing between the flat tubes 5. .

The refrigerant that has entered the second header pipe 2 flows down in the second header pipe 2, but is blocked by the check valve 22 provided in the second partition plate 22, and the first partition plate 21 and the first partition plate 21. 2 It flows into the flat pipe 5 between the partition plates 23 and reaches the first header pipe 1 again. Also here, the refrigerant efficiently exchanges heat with air and evaporates.

In this way, the refrigerant re-flowing into the first header pipe 1 flows downstream, flows into the flat pipe 5 below the second partition plate 23, and is collected again in the second header pipe 2. It flows out and reaches the compressor.

In the heat exchanger thus functioning as an evaporator, since the refrigerant is of a multi-pass type (three-pass type) in which the refrigerant flows while making a U-turn in the core portion 8, the residence time of the liquefied refrigerant in the core portion 8 is For a long time, the liquid refrigerant is sufficiently vaporized and exhibits excellent functions as an evaporator.

When the heat pump type air conditioner is operated for heating, the heat exchanger functions as a condenser. In this case, the high-temperature and high-pressure refrigerant discharged from the compressor flows in from the second conduit 4 as shown in FIG. The high-temperature and high-pressure refrigerant flowing from the second conduit 4 into the second header pipe 1 flows upwards against the valve body 32 of the check valve 23, so that the refrigerant in the second header pipe 1 is collected together. Flow through all flat tubes 5. The refrigerant flowing from the flat pipe 5 below the first partition plate 21 of the first header pipe 1 into the first header pipe 1 also flows upward against the valve body 32 of the check valve 22 and flows into the first conduit 3. Reach

Therefore, when functioning as a condenser, it is of a one-pass type, so that the flow velocity of the cooling medium is high, heat can be efficiently exchanged with the air, and the high-pressure and high-temperature vaporized refrigerant can be quickly condensed.

The present invention has been described above with reference to a preferred embodiment, but the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims for utility model registration. can do. For example, in the above embodiment, each of the first and second header pipes is provided with the first and second partition plates having the check valve, and the evaporator is a three-pass type. A similar third partition plate is provided below the second partition plate, and a fourth partition plate is provided below the third partition plate of the second header pipe so that it functions as a 5-pass type evaporator. The number of partition plates having a check valve may be increased.

[0021]

[Effect of device]

 As described above, according to the present invention, since the check valve is provided in the partition plate provided in the header pipe of the multi-flow heat exchanger, the flow of the heat exchanged fluid in the heat pump type air conditioner is switched. Accordingly, it is possible to use a multi-pass or one-pass heat exchanger that can always be used as an evaporator or a condenser with a high heat exchange rate.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention,

FIG. 2 is a cross-sectional view showing a state where the same embodiment is used as a capacitor,

FIG. 3 is a plan view of a check valve,

FIG. 4 is a side view of the check valve,

FIG. 5 is a sectional view showing a mounting state of the check valve,

FIG. 6 is a perspective view of a general multi-flow heat exchanger,

FIG. 7 is a sectional view showing a conventional heat exchanger.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st header pipe, 2 ... 2nd header pipe, 3 ... 1st conduit, 4 ... 2nd conduit, 5 ... Flat tube, 7 ... Radiating fin, 8 ...
Core part, 21 ... 1st partition plate, 22 ... Check valve, 23 ... 2nd partition plate, 24 ... Check valve.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location F25B 41/00 D 9335-3L

Claims (1)

[Scope of utility model registration request] 1. A first header pipe (1) to which a first conduit (3) is attached and a second header pipe (2) to which a second conduit (4) is attached are separated in parallel by a predetermined length and are paired in parallel. The header pipes (1, 2) are connected by a number of flat tubes (5), and heat transfer fins (7) are attached between these flat tubes (5) to form the core part (8). A heat pump type air conditioner provided with a multi-flow heat exchanger in a cooling cycle, comprising one or a plurality of first partition plates downstream of the first conduit (3) of the first header pipe (1). (21) is provided, and 1 is provided upstream of the second conduit (4) of the second header pipe (2).
One or a plurality of second partition plates (23) are provided, and heat is exchanged from the first conduit (3) to the second conduit (4) in each of the first and second partition plates (21, 23). Close when flowing fluid,
On the contrary, in the heat pump type air conditioner, the check valve (22, 24) which is opened when the heat exchange fluid is circulated from the second conduit (4) to the first conduit (3) is provided. Heat exchanger.