JPH0631325Y2 - Wind tube heat exchanger for heat storage - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention relates to a heat storage finned tube heat exchanger used in an air conditioner and the like, and particularly to a heat storage with improved pipe and fin structures. The present invention relates to a finned tube heat exchanger.

(Prior Art) Generally, a heat storage type fin tube heat exchanger that inputs and outputs heat by utilizing a solid-to-liquid or liquid-to-solid phase change of a heat storage agent such as paraffin is known.

Conventionally, this heat storage type fin tube heat exchanger has a fin tube a as shown in FIG. 9 in a casing. The finned tube a is composed of a plurality of pipes b and a plurality of fins c. Fin c is pipe b
Are arranged side by side on the outer peripheral portion of the device so as to have multiple stages in the longitudinal direction. These pipes b are formed of a straight cylindrical body as shown in FIGS. Further, these fins c have a plurality of pipe insertion holes d along the longitudinal direction thereof as shown in FIG. As shown in FIG. 9, a folded back projection e is formed in the pipe insertion hole d so that the fin c and the pipe b come into close contact with each other, and the fins c adjacent to each other are joined by the folded back projection e. It was

(Problems to be solved by the invention) By the way, this kind of heat storage fin tube heat exchanger has the following problems.

The volume expansion coefficient of paraffin as a heat storage agent differs between solid and liquid by about 10%. Therefore, when the solid pie fin that has entered the gap (f in the figure) between the fin c and the pipe b becomes a liquid, a volume expansion of about 10% occurs, and at this time, the paraffin moves the fin c to the outside (force (Weak one)
The fin c moves to one side or the like. Therefore, there is a problem in that the contact resistance between the fin c and the pipe b increases and the performance deteriorates.

Further, paraffin has a property of melting from a high temperature portion, and melts from the vicinity of the pipe b where heat is first transmitted. Therefore, there has been a problem that the vicinity of the pipe b is expanded in volume first and the fin c is separated from the pipe b.

Further, between adjacent fins c, paraffin expands in volume between the fins c and cannot pass through the fins c. Therefore, there is a problem that movement or deformation of the fins c due to the force must be restricted. It was

In view of the above-mentioned problems, the present invention provides a heat storage fin tube heat exchanger capable of excellent heat input and output without the fins moving or deforming even when paraffin is used as the heat storage agent. It is intended.

[Structure of the Invention] (Means for Solving Problems) In order to solve the problems in the prior art, the present invention provides a plurality of pipes provided in a casing along the outer peripheral portion thereof along the longitudinal direction thereof. While forming the communication groove of each strip,
A plurality of fins arranged side by side in the longitudinal direction of the pipe so as to be multi-tiered in the outer peripheral portion of the pipe are each provided with an opening for communicating these.

(Operation) Since a plurality of communicating grooves are formed along the longitudinal direction in the outer peripheral portions of the plurality of pipes as described above, the solid paraffin that has entered the gap between the fin and the pipe is Even if the liquid becomes liquid and volume expansion occurs, the liquid paraffin flows through the communication groove and flows out to the outside in the longitudinal direction of the pipe, so that the fin does not move to one side or the like, and the fin and the pipe contact each other. It is prevented that resistance increases and performance deteriorates.

Further, even if the paraffin is melted near the pipe having a high temperature, the liquid paraffin also passes through the communication groove and flows out in the longitudinal direction of the pipe, so that no force is applied to the fin and the fin is removed from the pipe. It is prevented from leaving.

Further, since openings are formed in the plurality of fins so that they communicate with each other, even if solid paraffin becomes liquid and volume expansion occurs, liquid paraffin passes through the openings and the adjacent fins are adjacent to each other. Since the fins flow out from between, the fins are prevented from being moved and deformed without being applied with a force.

Embodiment An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the heat storage fin tube heat exchanger of the present invention. As shown in the figure, a plurality of pipes 1 are provided in the casing. These pipes 1 are arranged side by side so as to have axes in the same direction.
On the outer peripheral portion of these pipes 1, several communication grooves 2 are formed along the longitudinal direction thereof. In this embodiment, the communication grooves 2 of several lines are formed as straight grooves which are parallel to each other along the longitudinal direction of the pipe 1 as shown in FIGS. 2 and 3. This communication groove 2 is specifically formed as shown in FIG. 5 in consideration of the fluidity of liquid paraffin. For example, a pipe 1 having a pipe diameter of 9.52 mm and a wall thickness of 0.45 mm is provided with six communicating grooves 2. As shown in the figure, adjacent groove intervals are 60 °, groove width is 1.0 mm, and groove depth is 0.2 mm.

Further, a plurality of fins 3 are arranged side by side on the outer peripheral portion of the pipe 1 in which the communication groove 2 is formed so as to have multiple stages in the longitudinal direction. The fin 3 is formed of a rectangular flat plate as shown in FIG.

As shown in the figure, the fin 3 is formed with a plurality of pipe insertion holes 4 along the longitudinal direction thereof as in the conventional case. The pipe insertion hole 4 is formed with a folded back protrusion 5 as shown in FIG. 1 so that the fin 3 and the pipe 1 are in close contact with each other. The folded back protrusion 5 joins the adjacent fins 3 together. There is. The pipe 1 is inserted into the pipe insertion hole 4, expanded and fixed. Also these fins 3
An opening 6 is formed on both sides of the pipe insertion hole 4 in the longitudinal direction so that the fins 3 communicate with each other. In this embodiment, the opening 6 is formed by a cut and raised tongue which is formed by cutting and raising the fin 3.

Next, the operation of the above embodiment will be described.

Paraffin, which is used as a heat storage agent, has a change point that causes mutual phase change between solid and liquid at a temperature of about 60 ° C., and there is an input / output of heat of about 45 kcal / kg during this phase change. However, as described above, when the phase changes from solid to liquid, the volume expands and the volume increases by about 10%. Therefore, the paraffin that has entered the gap that is structurally formed between the fin 3 and the pipe 1 or the paraffin positioned between the adjacent fins 3 repeatedly contracts and expands due to the phase change. The paraffin that has entered between the fins 3 and the pipe 1 pushes the fins 3 outward (in the direction in which the force is weak), which adversely affects the adhesion and performance of the fins 3 and the pipe 1. Further, the paraffin positioned between the adjacent fins 3 moves or deforms the fins 3 in the direction in which the force is weak.

Therefore, in the heat storage finned tube heat exchanger of the present embodiment, the communication groove 2 is formed on the outer peripheral portion of the pipe 1 along the longitudinal direction thereof and is composed of several straight grooves that are parallel to each other. The paraffin that has penetrated between the fins 3 and the pipe 1 changes its phase from a solid to a liquid and increases in volume, and then passes through the communication groove 2 and flows out in the longitudinal direction. . As a result, no force is applied to the fins 3 from the paraffin, the movement of the fins 3 is prevented,
The performance deterioration due to the increase in the contact resistance between the fin 3 and the pipe 1 is prevented.

Further, even if the paraffin begins to melt near the pipe 1 having a high temperature, the paraffin that has been liquefied first passes through the communication groove 2 and flows outward in the longitudinal direction, so that a force is applied from the paraffin to the fins 3. Thus, the fin 3 is prevented from coming off the pipe 1. It should be noted that the heat transfer performance does not deteriorate in the communication groove 2 of this degree, and the pipe expansion adhesion between the pipe 1 and the fin 3 is more important.

Furthermore, in the heat storage fin tube of this embodiment,
Since the fins 3 arranged in multiple stages on the outer peripheral portion of the pipe 1 are formed with the cut-and-raised tongue-shaped openings 6 formed by cutting and raising the fins 3 in order to connect them, they are adjacent to each other. Even if the paraffin located between the fins 3 is changed from a solid to a liquid and its volume is increased, it will pass through the opening 6 and flow out from between the adjacent fins 3. As a result, the paraffin is not sealed between the fins 3, so that no force is applied from the paraffin to the fins 3, and the fins 3 are prevented from moving or deforming. In particular, the cut-and-raised tongue formed as the opening 6 also functions as a deformation preventing stopper that restricts the fin 3.

As described above, according to the present invention, it is possible to realize a heat storage finned tube heat exchanger using paraffin as a heat storage agent, and FIG. 8 shows an air conditioner configured by applying this to a refrigeration cycle. is there.

In the figure, 7 is a compressor, 8 is a heat storage tank (find heat heat exchanger for heat storage), 9 is an indoor heat exchanger, 10 is an outdoor heat exchanger, 11 is a first opening / closing valve, and 12 is a second opening / closing. A valve, 13 is a first capillary tube, 14 is a second capillary tube, and 15 is a check valve.

When brine or the like is used as the refrigerant and the heat is stored in the heat storage tank 8, the first opening / closing valve 11 is closed and the second opening / closing valve 12 is opened, and the compressor 7, the heat storage tank 8 and the indoor heat exchanger are set. The refrigerant is caused to flow in the order of 9, the second capillary tube 14, and the outdoor heat exchanger 10.

When the heat stored in the heat storage tank 8 is taken out, the compressor 7, the heat storage tank 8, the indoor heat exchanger 9 and the first open / close valve 11 are opened and the second open / close valve 12 is closed. Refrigerant is caused to flow in the order of the first capillary tube 13 and the heat storage tank 8. As a result, the start-up of the heating operation and the start-up of the defrosting operation become good, and the operation efficiency is improved.

Next, another embodiment of the heat storage fin tube heat exchanger of the present invention will be described. In another embodiment, several communication grooves 2 formed on the outer peripheral portion of the pipe 1 are formed by spiral grooves parallel to each other along the longitudinal direction of the pipe 1 as shown in FIG. The opening 6 is formed by a plurality of small holes.

The operational effects of the other embodiments are similar to those of the above-described embodiments.

In the present invention, a straight groove formed as the communication groove 2,
Even if the combination of the cut and raised tongue and the plurality of small holes formed as the spiral groove and the opening 6 is arbitrarily selected, the same action and effect can be obtained.

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) It is possible to prevent the fins from moving and increasing the contact resistance between the fins and the pipes and reducing the performance by forming several communicating grooves along the longitudinal direction on the outer peripheral portion of the pipe. Since the fins are prevented from separating from the pipe and the fins are prevented from moving and deforming by forming an opening communicating with the fins, even when paraffin is used as the heat storage agent. A fin tube heat exchanger for heat storage that can ensure good heat transfer properties without moving or deforming the fins can be realized.

(2) As a result, a heat exchanger similar to that used in an air conditioner or the like can be used, and the manufacturing method can be standardized and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the heat storage finned tube heat exchanger of the present invention, FIG. 2 is a lateral sectional view of a pipe adopted in the present invention, and FIG. 3 is a pipe adopted in the present invention. FIG. 4 is a side view showing an embodiment, FIG. 4 is a side view showing another embodiment of the pipe adopted in the present invention, FIG. 5 is an explanatory view showing a concrete example of the communication groove of the present invention, and FIG. 6 is a book. FIG. 7 is a perspective view showing an embodiment of a fin used in the present invention, FIG. 7 is a perspective view showing another embodiment of the fin used in the present invention, and FIG. 8 is a frozen tube heat exchanger for heat storage of the present invention. A system diagram applied to a cycle, Fig. 9 is a side sectional view showing a conventional heat storage fin tube heat exchanger, Fig. 10 is a transverse sectional view showing a pipe which has been conventionally used, and Fig. 11 is conventionally used. FIG. 12 is a side view showing the pipe, and FIG. 12 is a perspective view showing the fin that has been conventionally used. In the figure, 1 is a pipe, 2 is a communication groove, 3 is a fin, and 6 is an opening.

Claims (3)

[Scope of utility model registration request] 1. A plurality of pipes in a casing for allowing heat to flow in and out by a mutual phase change between a solid and a liquid of a heat storage agent such as paraffin, and a plurality of pipes arranged in the longitudinal direction at the outer peripheral portion of the pipes. In a heat storage finned tube heat exchanger having a plurality of fins arranged in parallel with each other, several communication grooves are formed in the outer peripheral portion of the pipe along its longitudinal direction, and the outer periphery of the pipe is A fin tube heat exchanger for heat storage, characterized in that each of the fins has a plurality of fins arranged side by side, and openings are formed to communicate these fins. 2. The heat storage fin tube heat storage device according to claim 1, wherein the plurality of communication grooves are formed by straight grooves or spiral grooves parallel to each other along the longitudinal direction of the pipe. Exchanger. 3. The utility model registration claim in which the opening is cut and raised to form a tongue or a plurality of small holes.
A heat exchanger fin tube heat exchanger according to the item.