KR20230083918A - Heat exchager using swirl-type tube body - Google Patents

Abstract

The present invention discloses a heat exchanger using a spiral tube body. Specifically, a housing sealed with an upper cover and a lower cover and having a heat medium inlet formed on one side, a heat medium discharge pipe formed on the upper cover to discharge heat medium from the inside of the housing, and vertically penetrating the edge of the housing A working fluid inlet pipe into which a working fluid flows, and a plurality of spiral tubes, one end of which is in communication with the working fluid inlet pipe and which is bent inward in a spiral shape, are stacked in the vertical direction, and each is bonded to each other to form an integrated spiral tube body , A working fluid discharge pipe passing through the heat medium discharge pipe and the housing and communicating with the other end of the spiral tube body to discharge the working fluid, heat exchange between the heat medium in the housing and the working fluid passing through the spiral tube body In the heat exchanger made of this, it is characterized in that a baffle bent in a spiral shape is inserted along the spiral path of the spiral tube body to block the passage of the heat medium across the spiral tube body.

Description

Heat exchanger using swirl-type tube body {Heat exchager using swirl-type tube body}

The present invention relates to a heat exchanger, and more particularly, to a heat exchanger using a spiral tube body capable of heating, cooling, vaporizing, or liquefying a working fluid through heat exchange between a working fluid flowing through a plurality of stacked spiral tubes and a heating medium. it's about

In the case of natural gas (NG), which is a low-emission energy source widely used in real life, its volume is very large at room temperature, making it difficult to transport and store. So, to facilitate storage and transportation, it is transported and stored by changing it to liquefied natural gas (hereinafter referred to as LNG), which is in a cryogenically liquefied state and occupies only about 1/600 the volume of gas.

Because liquefied natural gas cannot be used immediately because it is in a liquefied state, a vaporizer is required to convert it into gaseous natural gas through heat exchange.

There are two substances inside the vaporizer. In the case of LNG, heat is supplied and vaporization occurs, and in the case of the heat medium flowing through the heater tube, heat is taken away and liquefied or the temperature drops. The temperature of LNG is about -163°C, and steam or high-temperature water can be used as a heat medium. In the case of hot water, glycol propylene is mixed and used.

Heat exchangers using heat exchange are used in all fields of industry, including such vaporizers. The heat exchanger is used for the purpose of heating, cooling, or liquefying a working fluid as well as vaporizing a liquid like the aforementioned LNG.

In most heat exchangers, it is fundamental to increase the contact area and contact time so that heat exchange between the heating medium and the working fluid can occur actively, so that heat exchange can occur quickly.

For this purpose, as in the prior art below, a tube in which a working fluid flows is installed in a spiral, coil, or spiral shape, and heat exchange is performed while passing a heat medium to the outside of the tube.

At this time, various attempts have been made to improve the heat exchange efficiency by variously modifying the shape of the tube or overlapping one or more tubes.

Regarding this, the present applicant presented a "heat exchanger using a vortex tube body" in Korean Patent Registration No. 10-2169155 (October 16, 2020).

Here, by proposing a structure in which a plurality of spiral tubes are integrated, the structure is simple, miniaturized, and heat exchange efficiency is greatly improved.

However, even if a spiral tube body integrated by joining actual spiral tubes is manufactured, a minute gap is generated between each stacked tube, and the heat medium moves across the tube body through the minute gap, resulting in a problem of poor thermal efficiency. occurred.

In addition, when the pressure of the heating medium flowing along the outside of the vortex tube body or the working fluid flowing along the inside of the tube body is high, the force supporting the tube body is weak and may cause deformation or breakage.

Republic of Korea Patent Publication 10-2016-0139530 (2016.12.7.) "Heat exchanger equipped with baffle and spacer plate" Republic of Korea Patent Publication 10-2016-0139528 (2016.12.7.) "Pluggable spiral flow type heat exchanger" Korean Registered Patent No. 10-1677605 (2016.11.14.) "Vortex type heat exchanger" Republic of Korea Registered Patent No. 10-2169155 (2020.10.16.) "Heat exchanger using vortex tube body"

Therefore, the present invention is to solve the above-described problems, and an object of the present invention is to have a spiral tube body structure by stacking and bonding one or more spiral tubes to each other, but a heat medium is transferred through a fine gap between each tube joined. It is to provide a heat exchanger using a spiral tube body provided with a baffle blocking passage.

Another object of the present invention is to use a spiral tube body having a structure capable of maintaining the width of the spiral flow path and firmly supporting the spiral tube body so that the heating medium can flow constantly inside the spiral tube body. to provide a heat exchanger.

Another object of the present invention is to provide a heat exchanger using a spiral tube body capable of improving heat exchange efficiency between a heating medium and a working fluid.

A heat exchanger using a spiral tube body according to the present invention for achieving the above object is a housing sealed with an upper cover and a lower cover and having a heat medium inlet formed on one side, and a heat medium inlet formed on one side, formed in the upper cover and inside the housing A heat medium discharge pipe for discharging a heat medium from the housing, a working fluid inlet pipe through which the working fluid flows while vertically penetrating the edge of the housing, and a plurality of spiral tubes having one end in communication with the working fluid inlet pipe and bending inward in a spiral shape. are stacked in the vertical direction and each is bonded to each other and integrated, and a working fluid discharge pipe that passes through the heat medium discharge pipe and the housing and communicates with the other end of the spiral tube body to discharge the working fluid, In the heat exchanger in which heat is exchanged between the heating medium in the housing and the working fluid passing through the spiral tube body, the spiral tube body is vortexed along the spiral path of the spiral tube body so as to block the heat medium from passing across the spiral tube body. A baffle bent into shape may be inserted.

At this time, protruding pieces protruding from both surfaces of the baffle to support the spiral tube body are further formed. The protruding pieces may be partially cut from the baffle and bent to form an inclined shape.

Here, it is preferable that the protruding pieces are alternately formed left and right along the height of the baffle.

A first blocking plate is provided between the working fluid inlet pipe and the housing.

In addition, an inlet connection part communicating with the working fluid inlet pipe is formed at one end of each spiral tube of the spiral tube body, and the inlet connection part is alternately connected to one side and the other side of the working fluid inlet pipe along the longitudinal direction. can be connected with

At this time, it is preferable that a second blocking plate is provided between the inflow connection part connected to one side of the working fluid inlet pipe and the inflow connection part connected to the other side.

Meanwhile, spiral heat exchange fins may be formed on outer circumferential surfaces of the working fluid inlet pipe and the working fluid discharge pipe.

According to the present invention described above, the following effects are obtained.

First, since a plurality of spiral tubes are stacked and joined together to form an integrated spiral tube body, it is formed like a partition and heat exchange is performed while the heat medium flows along the spiral path, so the time and area for heat exchange are maximized, resulting in heat exchange efficiency. can be greatly improved. In addition, the structure is simple, it can be miniaturized, and the manufacturing cost is reduced.

Second, baffles are provided along the spiral path to block the passage of the heat medium through the minute gaps formed between the stacked tubes, so that the heat medium flows only along the baffles, thereby creating conditions in which heat exchange can be maximized. Therefore, the heat effect tube efficiency is improved.

Third, the protruding fins can support the spiral tube body, and improve heat exchange efficiency by inducing turbulent and vortex flows.

Fourth, heat exchange fins are formed to improve heat exchange efficiency.

1 is a perspective view showing the appearance of a heat exchanger using a spiral tube body according to an embodiment of the present invention;
Figure 2 is an internal perspective view of the present invention shown in Figure 1
Figure 3 is a longitudinal sectional perspective view of the present invention shown in Figure 1
Figure 4 is a cross-sectional view of the present invention shown in Figure 1
5 is a perspective view showing the baffle of the present invention shown in FIG. 2;
6 is a view showing the turbulator of the present invention
Figure 7 is a perspective view showing the heat medium inlet of the present invention

Hereinafter, an embodiment according to the present invention will be described in more detail with reference to the accompanying drawings.

For reference, the description with reference to the drawings is for easier understanding of the present invention, and the scope of the present invention is not limited thereto. And, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 is a perspective view showing the appearance of a heat exchanger using a spiral tube body according to an embodiment of the present invention, and FIG. 2 is an internal perspective view of the present invention shown in FIG. 1 .

Referring to the drawing, the present invention largely includes a housing 100, a heating medium discharge pipe 200, a working fluid inlet pipe 300, a spiral tube body 400, a working fluid discharge pipe 500 and a baffle 600. can be configured.

First, the housing 100 will be described.

The housing 100 is a hollow cylinder with an empty interior so that heat exchange can occur therein. The upper and lower portions of the housing 100 may be sealed with an upper cover 110 and a lower cover 120, respectively.

Alternatively, only the upper cover 110 may be assembled and disassembled, but the lower cover 120 may be integrated with the housing 100 to facilitate cleaning the inside of the housing 100 .

In addition, one or more heat medium inlets 130 may be formed on an outer circumferential surface of one side of the housing 100 so that heat medium may flow in from the outside. Preferably, a plurality of heat medium inlets 130 may be formed vertically on the outer circumferential surface of the housing 100 so as to be introduced in only one direction of the housing 100, as shown.

Next, the heat medium discharge pipe 200 will be described.

The heat medium discharge pipe 200 is a pipe for discharging the heat medium introduced into the housing 100 through the heat medium inlet 130 to the outside after performing heat exchange while flowing, and may be formed in a circular pipe shape.

The heat medium is introduced from one side of the housing 100 and flows to the center while turning along the spiral path of the spiral tube body 400 to be described later. Because of the structure, the heat medium discharge pipe 200 is provided in the upper center of the housing 100.

At this time, the lower end of the heat medium discharge pipe 200 is coupled to the center of the upper cover 110 to communicate with it.

Further, a separate branch pipe 210 may be formed on the side of the heat medium discharge pipe 200 to control the discharge direction of the heat medium discharged.

For reference, the discharged heat medium may be treated and circulated to be sent to the heat medium inlet 130 again.

Next, the working fluid inlet pipe will be described with reference to FIGS. 3 and 4 together.

3 is a longitudinal cross-sectional perspective view of the present invention shown in FIG. 1, and FIG. 4 is a cross-sectional view of the present invention shown in FIG. At this time, in FIG. 4, the solid arrow indicates the flow of the working fluid, and the dotted arrow indicates the flow of the heating medium.

The working fluid inlet pipe 300 is a pipe through which a working fluid to perform heat exchange is introduced.

As shown, the working fluid inlet pipe 300 is vertically installed and accommodated at the inner edge of the housing 100 .

At this time, the lower end of the working fluid inlet pipe 300 is coupled to the lower cover 120, and the upper end penetrates the upper cover 110 to inject working fluid from the outside.

Meanwhile, the working fluid inlet pipe 300 is preferably provided adjacent to the heat medium inlet 130 . This is because the heat medium introduced into the heat medium inlet 130 directly meets the working fluid inlet pipe 300 and first heat exchanges with the working fluid accommodated in the working fluid inlet pipe 300.

In addition, since the first blocking plate 710 to be described later is installed to block between the working fluid inlet pipe 300 and the housing 100, the heat medium flowing into the heat medium inlet 130 is removed from the first blocking plate 710. It is preferable that the working fluid inlet pipe 300 is provided adjacent to the heat medium inlet 130 in order to flow directly along the vortex path without reverse flow over a long distance.

Preferably, a heat exchange fin 510 may be formed on an outer circumferential surface of the working fluid inlet pipe 300 to increase heat exchange efficiency.

The heat exchange fin 510 serves to increase a heat exchange area, and may have various shapes, but may be formed in a spiral shape as shown in FIG. 2 .

In addition, the working fluid inlet pipe 300 may be provided in a state directly attached to the inner circumferential surface of the housing 100, but as shown, it is spaced apart, and as described above, the first blocking plate 710 is provided therebetween. The heat medium provided and introduced into the heat medium inlet 130 is blocked by the first blocking plate 710 and flows along the outer circumferential surface of the spiral tube body 400 so as to flow into the inside.

Next, the spiral tube body 400 will be described.

As shown, the spiral tube body 400 has a shape in which spiral tubes 400' in which linear tubes are bent in a spiral shape are stacked up and down. At this time, the spiral tube 400' has a shape spirally turning in one plane and is approximately similar to the shape of a mosquito repellent.

Here, a plurality of the spiral tubes 400' having the same shape and size are stacked in the vertical direction, and each of the stacked spiral tubes 400' is bonded to each other to form an integrated spiral tube body 400. can do. This can function like a bulkhead preventing the heating medium from flowing across the spiral tube 400'.

In addition, one end of the spiral tube 400' is formed with an inlet connection portion 410 and communicates with the side surface of the working fluid inlet pipe 300, and the other end is formed with a discharge connection portion 420, respectively, for the operation described later. It communicates with the side of the fluid discharge pipe 500.

At this time, each of the inlet connection parts 410 may be connected in a row along the longitudinal direction of the working fluid inlet pipe 300. Preferably, as shown, the inlet connection parts 410 are alternately connected in a zigzag shape. It's good to be. That is, the odd-numbered inlet connection part may be connected to one side of the working fluid inlet pipe 300 in a row, and the even-numbered inlet connection part may be connected to the other side in a row.

For reference, the inlet connection parts 410 are connected to the working fluid inlet pipe 300 so as to face the heat medium inlet 130 side. Therefore, the heat medium introduced into the heat medium inlet 130 directly contacts the inlet connection portion 410 and heat exchange can be performed quickly.

In addition, the discharge connection part 420 may also be connected in a line along the longitudinal direction of the working fluid discharge pipe 500, but preferably, as shown, odd-numbered discharge connection parts are connected in a line to one side of the working fluid discharge pipe 500. And, the even-numbered discharge connection may be a structure connected in a row on the opposite side.

On the other hand, it is preferable that the upper end of the spiral tube body 400 is bonded to the upper cover 110 and the lower end is bonded to the lower cover 120 . This is to induce the heat medium introduced into the housing 100 to flow only along the spiral passage formed along the inside of the spiral tube body 400 .

Next, the working fluid discharge pipe 500 will be described.

The working fluid discharge pipe 500 is a pipe through which the working fluid is discharged after performing heat exchange, and is vertically installed to pass through the center of the housing 100 and be accommodated therein. Also, a portion exposed to the outside may be provided to pass through the center of the heat medium discharge pipe 200 .

To this end, by making the outer diameter of the working fluid discharge pipe 500 smaller than the inner diameter of the heat medium discharge pipe 200 and overlapping each other, the heat medium can be discharged between the heat medium discharge pipe 200 and the working fluid discharge pipe 500. .

Next, the baffle, which is a key technical subject of the present invention, will be described with reference to FIG. 5 . 5 is a perspective view showing the baffle of the present invention shown in FIG. 2;

The baffle 600 serves to block the passage of the heat medium through the wall surface of the spiral tube body 400 .

The spiral tube body 400 is formed by stacking and joining a plurality of spiral tubes 400', and even when they are joined, fine gaps or gaps are formed, so that the heat medium actually crosses the gap and leaks.

In order to prevent this, it is preferable that a baffle 600 is provided to guide the heating medium to flow along only the vortex flow path formed inside the vortex tube body 400 as shown.

The baffle 600 may have a structure in which a flat plate is bent in a spiral shape like a spring. And, the baffle 600 is provided to be disposed along the middle trajectory of the vortex flow path of the vortex-shaped tube body 400 .

Therefore, the baffle 600 is disposed between the inner spiral tube body 400 and the outer spiral tube body 400, and the spiral tube body 400 is the inner baffle 600 and the outer baffle 600. placed between them to minimize the free passage of the heating medium across the spiral tube body 400.

Also, it is preferable that a plurality of protruding pieces 610 are further formed on the surface of the baffle 600 .

The protruding piece 610 may protrude from the surface of the baffle 600. As shown, the protruding piece 610 protrudes from both surfaces, and the protruding end portion may contact the spiral tube body 400.

That is, as the ends of the protruding pieces 610 protruding from both surfaces of the baffle 600 contact the inner and outer spiral tube bodies 400, respectively, the baffle 600 moves to either side within the swirl flow path. It can be placed in the center without being biased.

In this case, the protruding piece 610 may have a structure in which a portion of the baffle 600 is cut and bent obliquely. For example, it is possible to incise only three sides of the rectangle and bend the remaining one side that is not incised to incline it at an acute angle to form a protruding structure.

In addition, the protruding pieces 610 are arranged in a line along the height of the baffle 600, but protruding from both surfaces of the baffle 600 by alternately forming one protruding to the left and the other protruding to the right. It is desirable to make

In addition to the function of fixing the baffle 600, the protruding piece 610 can improve heat exchange efficiency by promoting turbulence or vortex flow by colliding with the heat medium flowing along the vortex flow path.

In the present invention, it is preferable that a second blocking plate 720 is provided between the inlet connection part 410 connected to one side of the working fluid inlet pipe 300 and the inflow connection part 410 connected to the other side.

The second blocking plate 720 has a flat plate shape, and one end is coupled to the outer circumferential surface of the working fluid inlet pipe 300 between the inlet connector 410 connected to one side and the other side of the working fluid inlet pipe 300, , The other end is coupled to the branching point where the inlet connection part 410 splits into one side and the other side.

Therefore, the heat medium introduced into the heat medium inlet 130 is blocked by the first blocking plate 710 and the second blocking plate 720 and does not directly flow into the spiral tube body 400, but the swirl After the heat exchange is performed while rotating between the outer circumferential surface of the molded tube body 400 and the inner circumferential surface of the housing 100, it is introduced into the spiral flow path of the spiral tube body 400 and full-scale heat exchange is performed to increase heat exchange efficiency. Maximize.

The operating state of the present invention is described below.

The heat medium introduced through the heat medium inlet 130 primarily undergoes heat exchange with the working fluid inlet pipe 300 and the inlet connector 410 connected thereto.

In addition, the flow is blocked by the first blocking plate 710 and the second blocking plate 720, flows backward, and performs secondary heat exchange while rotating along the outer circumferential surface of the spiral tube body 400, and then the spiral tube body ( 400) and flows to the center of the housing 100 along a vortex-shaped flow path formed therein, while tertiary heat exchange is performed.

At the same time, the working fluid is introduced through the working fluid inlet pipe 300 and flows along the spiral tube body 400 via the inlet connection part 410 .

The working fluid flows along the spiral tube 400', heat exchanges with the heating medium, and after reaching the center of the housing, is discharged through the discharge connection part 420 and the working fluid discharge pipe 500.

At this time, the baffle 600 does not allow the heat medium to flow across the spiral tube body 400, and heat exchange is performed while accurately flowing only along the path of the baffle 600, that is, the spiral flow path. Therefore, the heat exchange efficiency is maximized by extending the heat exchange time and uniformly distributing the heat in the shear area.

And, as described above, turbulence and vortex flow are generated by the protruding piece 610, so that heat exchange efficiency is improved.

Meanwhile, the heat medium collected in the center of the housing 100 is discharged to the outside through the heat medium discharge pipe 200, cooled or heated, and then reintroduced through the heat medium inlet 130 and circulated.

Of course, heat transfer can occur more actively by the heat exchange fins 310 and 510, and heat exchange efficiency is improved by vortexing the flow of the heat medium.

6 and 7 show another embodiment of the present invention. Figure 6 is a view showing the turbulator of the present invention, Figure 7 is a perspective view showing the heat medium inlet of the present invention.

In the present invention, a turbulator may be inserted to turbulentize the laminar flow inside the spiral tube 400' to improve the heat exchange rate.

The working fluid flowing inside the spiral tube 400' forms a laminar flow, and due to this, a boundary layer is formed between the working fluid and the heat medium exchanging heat through the tube wall, which hinders heat exchange. In addition, when the working fluid is vaporized, bubbles generated due to boiling may interfere with heat exchange.

It is preferable to install the turbulator 800 in order to eliminate such a boundary layer or boiling phenomenon, and any shape capable of turbulent flow is possible.

For example, as shown in FIG. 6 (a), a spring may be inserted into the spiral tube 400'. At this time, the outer diameter of the spring 810 is formed identical to the inner diameter of the spiral tube 400' so that the spring 810 is in close contact with the inner circumferential surface of the tube.

As another example, it may be a spiral plate 820 having a shape of spirally winding a flat plate as shown in FIG. 6(b).

As another example, as shown in FIG. 6(c), it may be a turbulence induction plate 830 having a shape in which protruding pieces 831 formed by partially cutting and bending both sides of a flat plate alternately protrude left and right.

Since the turbulator 800 having such a shape removes the boundary layer by turbulizing the laminar flow, heat exchange between the working fluid and the heat medium can occur actively.

On the other hand, in the present invention, the heat medium inlet 130 may have a circular cross-sectional area at the entrance where the heat medium first enters, but may have a shape in which the cross-sectional area becomes larger as the cross-sectional area changes to an elliptical shape as the heat medium progresses.

That is, the heat medium flowing into the housing 100 is introduced through the heat medium inlet 130 forming a vertically long oval shape.

It is preferable to have a vertically long oval shape so that the contact area between the inlet connection portion 410 that first meets the heating medium flowing into the heating medium inlet 130 can be maximized.

Representative embodiments of the present invention have been described above with reference to the drawings, but those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above information. Therefore, the scope of the present invention should not be limited to the described embodiments and should not be defined, and should be defined by not only the claims to be described later, but also those equivalent to these claims.

100: housing 110: upper cover
120: lower cover 130: heat medium inlet
200: heat medium discharge pipe 210: branch pipe
300: working fluid inlet pipe 310: heat exchange pin
400: vortex tube body 400 ': vortex tube
410: inlet connection 420: discharge connection
500: working fluid discharge pipe 510: heat exchange pin
600: baffle 610: protruding piece
710: first blocking plate 720: second blocking plate
800: Turbulator
810: spring 820: spiral plate
830: turbulence induction plate 831: protruding piece

Claims (11)

A housing sealed by an upper cover and a lower cover and having a heating medium inlet at one side through which a heating medium flows in, a heating medium discharge pipe formed on the upper cover and discharging a heating medium from the inside of the housing, and a working fluid passing through the edge of the housing vertically. A working fluid inlet pipe into which a working fluid is introduced, and a plurality of spiral tubes, one end of which is in communication with the working fluid inlet pipe and which is bent inward in a spiral shape, stacked in the vertical direction and bonded to each other to form an integrated spiral tube body; It includes a heating medium discharge pipe and a working fluid discharge pipe that passes through the housing and communicates with the other end of the spiral tube body to discharge the working fluid, so that heat exchange occurs between the heat medium in the housing and the working fluid passing through the spiral tube body. In the heat exchanger,
A heat exchanger using a spiral tube body, characterized in that a baffle bent in a spiral shape is inserted along a spiral path of the spiral tube body to block the passage of the heat medium across the spiral tube body. According to claim 1,
A heat exchanger using a spiral tube body, characterized in that protrusions protruding from both surfaces of the baffle to support the spiral tube body are further formed. According to claim 2,
The protruding piece is a heat exchanger using a spiral tube body, characterized in that a portion of the baffle is cut and bent to form an inclination. According to claim 3,
The heat exchanger using a spiral tube body, characterized in that the protruding pieces are formed alternately from side to side along the height of the baffle. According to claim 1,
A heat exchanger using a spiral tube body, characterized in that a first blocking plate is provided between the working fluid inlet pipe and the housing. According to claim 1,
An inlet connection part communicating with the working fluid inlet pipe is formed at one end of each spiral tube of the spiral tube body,
The inlet connection portion is a heat exchanger using a spiral tube body, characterized in that alternately connected to one side and the other side of the working fluid inlet pipe along the longitudinal direction. According to claim 6,
A heat exchanger using a spiral tube body, characterized in that a second blocking plate is provided between the inlet connection part connected to one side of the working fluid inlet pipe and the inlet connection part connected to the other side. According to claim 1,
A heat exchanger using a spiral tube body, characterized in that spiral heat exchange fins are formed on the outer circumferential surfaces of the working fluid inlet pipe and the working fluid discharge pipe. According to claim 1,
A heat exchanger using a spiral tube body, characterized in that a turbulator is inserted into each of the spiral tubes to induce the working fluid to form a turbulent flow. According to claim 9,
The turbulator is a heat exchanger using a spiral tube body, characterized in that any one of a spring, a spirally wound spiral plate, or a turbulence induction plate in which protruding pieces cut on both sides of a flat plate are alternately formed. According to claim 1,
The heat medium inlet is a heat exchanger using a spiral tube body, characterized in that the cross-sectional area forms a shape that changes from a circular shape to a vertically long oval shape.

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