JPS63217192A - Assembly structure of heat exchanger - Google Patents

Abstract

PURPOSE:To improve heat exchanging efficiency and remove deposited foreign matter easily by installing an airtight cylindrical case at the open end of which a cover is removably placed and means of fixing both ends of a helical tube on the outer surface of which a helical buffle is placed, on the cover. CONSTITUTION:In the inside of an airtight cylindrical case 1 which is used as a passage for a primary heat exchanging fluid and at the upper open end of which a cover 2 is attached, a cylinder helical tube 3 which is used as a passage for a secondary heat exchanging fluid, is installed. A helical buffle 5 is incorporated into the helical gaps of the tube 3. The presence of this buffle 5 causes water flowing in to flow along a helical flow passage without flowing directly from an inlet to an outlet. Even if foreign matter or microorganism contained in the primary fluid sticks or deposits, the tube 3 is easily taken out with the removable cover. Heat exchanging efficiency equal to that of a double-tube type heat exchanger can be provided and also deposited foreign matter can be removed easily and rapidly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water-cooled heat exchanger 2 for use, for example, in liquefying a warm gas phase refrigerant discharged from a compressor of a refrigeration system.

``Prior art'' A conventional water-cooled heat exchanger used for the above purpose is made by forming a tube with a double structure inside and outside into a coil shape.
A double pipe type where the refrigerant flows through the outside (inner) side tube and cooling water through the outside (inner) side tube, or a coiled tube with a cylindrical appearance that serves as the flow path for the refrigerant, and an inlet/outlet for the chilled water. A shell-and-coil type is known, which is housed in a case (shell) that serves as a flow path for cold water.

[Problem to be solved by the invention 1 The above double tube heat exchanger has a high volumetric specific heat exchange efficiency,
Although it has the feature of reducing the external size, even if impurities and microorganisms in the water adhere to and accumulate inside the cooling water distribution tube, it is difficult to remove them due to the structure, so the heat exchange capacity decreases over time. I'm coming.

As a result, only the capacity of the liquefaction process portion of the compressed gas phase Yr1 medium of the refrigeration cycle is locally reduced, making it impossible to make full use of the refrigeration capacity of the entire cycle, and there is also the possibility that the refrigerant pressure will become high. Furthermore, even if an attempt is made to branch the refrigerant flow paths in parallel in order to reduce the pressure loss of the refrigerant caused by the heat exchanger, it is difficult to carry out with a double structure pipe because the addition becomes too complicated.

- In the case of the 1-way seal and 1-coil heat exchanger, the length of the cooling water channel is too short compared to the total length of the coiled tube that serves as the refrigerant flow path, so the refrigerant and cooling A large discrepancy occurs in the water flow speed, making it impossible to sufficiently improve heat exchange performance.

If the shell is made larger or the flow rate is increased as a countermeasure, the device will have to be made larger, which will result in disadvantages in terms of product quality and cost.

However, it is far superior to the double pipe type in terms of ease of clearing the flow channel.

The present invention is a heat exchanger assembly having a structure that incorporates the advantages of the two types of heat exchangers, the double-tube type and the shell-and-coil type, as described above, and minimizes their disadvantages. The purpose is to provide an attached structure.

[Means for Solving the Problems] In order to achieve the above object, the heat exchanger assembly structure according to the present invention includes each member (a) to (d) having the configuration and function listed below. ) was adopted.

(a) There is no heat exchange flow path for water as the first heat exchange fluid, and the inlet and outlet thereof are provided at both ends of the cylinder, and -
An airtight cylindrical case with a removable lid attached to the open end of the cylinder.

(b) A disc-shaped helical tube that forms a flow path for the second heat exchange fluid and is housed within the case.

(c) Fixing means for inserting and fixing both ends of the helical tube into the navigation lid.

(d) A helical baffle having a helical pitch equivalent to the helical pitch of the helical tube and having an outer diameter that can be inserted into the cylindrical case is provided on the outer peripheral surface of the helical baffle, and a hollow portion of the helical duplex is provided. A middle cylinder with a baffle that can be stored in.

Here, the means for attaching and detaching the lid body is connected to the open tube end of the cylindrical case,
These include a 7-lunge joint formed at the point of contact with the lid. In addition to incorporating only one cylindrical helical tube, two or more cylindrical helical tubes may be used in combination.

[Function] The heat exchanger having the above-mentioned set-up structure has a second structure between the inner circumferential surface of the cylindrical case and the outer circumferential surface of the baffled middle cylinder that is responsively incorporated into the case. A cylindrical channel is formed through which water, which is one heat exchange fluid, flows. Since a helical baffle is interposed in this flow path, the inflowing water is forced to follow the spiral flow path without going straight from the inlet to the outlet.

Since the helical pitch of the helical pipe forming the flow path of the second heat exchange fluid and the pitch width of the helical baffle are set to be equal, the extension length of the flow path of the first and second heat exchange fluids is set to be the same. are equal.

Therefore, although the heat exchanger assembly according to the present invention is basically a conventional shell-and-coil type, it also produces a heat exchange capacity functionally equivalent to that of a conventional double-tube type. .

During use of the heat exchanger, if foreign objects or microorganisms in the water contained in the first heat exchange fluid gradually adhere and accumulate inside the cylindrical case, the lid may be unfastened by the attachment/detachment means. By removing the helical tube from the lid and twisting the lower end of the baffled middle tube, this middle tube can be centered at 6S from the helical gap of the helical tube.

Therefore, foreign matter in the water that has accumulated inside the cylindrical case or adhered to the surface of the helical tube or spiral baffle can be removed into the cylindrical case.

[Effects of the invention] a) It is possible to provide heat exchange performance equivalent to that of a conventional double-pipe heat exchanger.

A) Foreign matter that has adhered or accumulated in the case due to the first heat exchange fluid can be quickly removed from the cylinder in the same way as a conventional shell-and-coil heat exchanger.

[Example] The configuration of the present invention will be specifically described below based on an example shown in the drawings.

1 to 6 are views relating to a water-cooled refrigerant condenser for use in a marine air conditioner as an embodiment of the present invention, and FIG. 1 is a side sectional view; Figure 2 is a cross-sectional view taken along line (A)-(A) in Figure 1, Figure 3 is an exploded view, and Figure 4 is a cross-sectional view taken from Figure 1.
Figure 6 is an explanatory diagram of the shape and structure of the baffled hollow cylinder. Note that the heat exchanger shown in FIG. 3 is somewhat different from that shown in FIG. 1 in the shape of the cylindrical case.

As shown in Fig. 3, the general structure of this heat exchanger is an airtight cylindrical case that serves as a passage for cooling water as the first heat exchange fluid, and has a lid 2 attached to the open end of the upper cylinder. A cylindrical helical tube 1-13 is housed within the helical tube 1, which serves as a cooling flow path for a refrigerant as a second heat exchange fluid. A baffled middle tube 4 having a helical baffle 5 provided on its outer circumferential surface is installed in the inner cavity of the helical knee 13 so as to be screwed into the helical gap of the helical tube 3.

Both ends 3A and 3B of the helical tube 3 are inserted through the lid 2 and fixed to the lid.

The lid body 2 is fastened to a flange 11 provided at the open end of the cylindrical case 1 using bolts 12 and puts 13 as attachment/detachment means.

The cylindrical case 1 shown in FIG. 1 is made by cutting a cylindrical body made of hard synthetic resin such as vinyl chloride to a predetermined size, and then fitting a bottom plate 10 made of hard synthetic resin into the opening on the bottom end to make the case airtight by gluing or the like. It is created by a sealing method.

A tube 8 serving as an inlet for cooling water is attached near the lower end of the outer peripheral wall of the cylindrical case 1, and a tube 9 serving as an outlet for the cooling water is attached near the upper end. Further, as shown in FIG. 1, an annular seven flange 11 made of the same material as the case 1 is fitted onto the top end of the cylindrical case 1, and fixed by a method such as adhesive or heat fusion. .

The lid body 2 for airtightly sealing the open cylinder end a on the top surface side of the cylindrical case 1 is a disc body having the same outer diameter as the flange 11 formed on this cylinder end. , made of the same synthetic resin or metal as the cylindrical case 1.

Bolt holes 2A for inserting bolts 12 are provided at multiple locations on the outer peripheral edge of the lid 2 at appropriate intervals, and the 7 flange 11 has holes corresponding to the bolt holes 2A. A bolt hole 11A is bored and a groove for mounting an airtight sealing gasket 17 of the lid body 2 is provided.

The cylindrical helical tube 3 is made by bending a tube made of aluminum, copper, etc. into a spiral shape as shown in FIG.

One of the ends of the two tubes raised vertically upward forms a refrigerant port 3A, and the other forms an outlet 3B, which pass through the tube insertion hole 2B or 2C provided in the lid body 2, respectively, and are inserted into the cylindrical case. It stands out beyond 1. Reference numerals 6 and 7 refer to tube fixing tubes having a structure similar to a union joint for airtightly sealing the insertion gap of this tube and fixing both ends of the helical tube 3 to the lid body 2. It is a member.

Further, 14 and 15 are conion nuts of a union joint for connecting both ends of the helical arch 1-13 to the refrigerant circulation piping system of the refrigeration equipment.

The baffled middle cylinder 4 is made of ABS resin, polypropylene resin, or the like, and formed with a spiral buckle 5 by an injection molding method so that the shape shown in FIG. 3 can be obtained.
It is shaped like a body.

Fig. 4 shows a partial longitudinal section. The baffle 5 is given a wedge-shaped cross-sectional shape to enable mold handling.

Another method for making the baffled inner cylinder 4 is to provide a spiral groove in the outer circumferential surface of the vibrator 4 made of vinyl chloride or the like in accordance with the six blades, as shown in Fig. 5. Moreover, a plurality of annular plates 5A made of vinyl chloride or the like and having a cut C@ at one point in the circumferential direction are fitted continuously while twisting the shape to form a series of spiral baffles. 5 to form the finished product shown in FIG. Between the phases q of adjacent annular plates 5A, and between the annular plates 5A and the middle cylinder 4
The contact surface (a) is joined by adhesion, heat fusion, or the like.

Flanges 4A and 4B, which serve as fixing means for stably fixing the middle tube within the cylindrical case 1, are fitted on the upper and lower ends of the middle tube 4 with baffles, or It is formed integrally with the cylinder 4. Shallow recesses may be provided in the centers of the lid 2 and the bottom plate 10 of the cylindrical case 1, respectively, into which the flanges 4A or 4B are fitted.

When the helical force lever 1-73 and the baffled middle cylinder 4 are assembled in the cylindrical case 1 as shown in FIG. b) As seen in FIG. 2 as a top view, there are vertically rising portions 3A at both ends of the helical tube 3 between the outer circumferential surface of the spiral baffle 5 and the inner circumferential surface of the cylindrical case 1. 3B will be located. Therefore, there is a helical tube 3 between the inner and outer circumferential surfaces.
A cylindrical gap with a thickness equivalent to the outer diameter of the helical baffle 5 will remain. However, if this gap part is repeated several times as it is, the gap phase of the helical pitch pitch of the helical baffle 5 will be as described above. communication occurs through the gap between the two. In this state, it becomes impossible to form a spiral cooling water flow path, which is the role given to the spiral baffle 5.Therefore, in this embodiment, the above-mentioned gap is replaced by a cylindrical spacer 1.
A spiral flow channel B is formed by filling the channel with G. The cylindrical suberi 1G is made of synthetic resin or foamed synthetic resin with a closed-cell structure, and is made by dividing it into two or more parts according to the cost, and then using adhesive etc. to attach the inside of the cylindrical case 1. Hang it on the wall.

The cylindrical case 1A depicted in FIG. 3 differs from the cylindrical case 1 shown in FIG.
A shape is given that allows 6 to become a monarchy. That is, the inner diameter of the case 1A is set to be slightly larger than the outer diameter of the spiral balanol 5, and a bulge is provided for positioning the rising portions 3A and 3B of the helical tube 3 inside the cylindrical case 1. 1D and 1E are formed inside the body during injection molding of the cylindrical case 1. At that time, flange 11
can also be molded at the same time.

FIG. 7 shows two male heat exchangers A1 and A2 having the structure shown in the above embodiment, respectively, as a condenser for liquefying a high-temperature vapor phase refrigerant and a condenser for lowering the water temperature of a fish tank 60. It is a schematic explanatory diagram of a refrigeration cycle when used as a water cooler (refrigerant evaporator).Since both heat exchangers A1 and A2 use double-structured helical coils, two sets of refrigerant The overall configuration of the 9° refrigeration cycle, which is equipped with an inlet 3A and an outlet 3B, consists of a compressor 1 for liquefaction of gaseous refrigerant;
2 is interposed between the refrigerant outgoing pipe 31 and the return pipe 32 connecting the refrigerant 1 output 130 and the suction port to the condenser 5A1 and the water cooler.

Then, a part of the refrigerant cooled and liquefied by the condenser A1 can be used for cooling purposes in the residence.Water cooling 3A
An evaporator 33 for generating cold air is connected to a refrigerant pipe connected in parallel to the refrigerant supply path to the refrigerant 2.

Other symbols in the figure indicate that 21 and 22 are heat exchangers A1 or A
2 is a joint for connecting the refrigerant pipe 31 or 32, and 23 and 24 are a base and a bracket on which the heat exchanger A1 or A2 is installed. , 51 is a water pipe that sends cooling water to the heat exchanger A1, 52 and 62 are water filters, 53 and 63
54 is a hot water return pipe, 61 is a pipe for drawing up cooled water, 64 is a cooling water return pipe, and 40 is an engine for driving the compressor 30.

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

In FIG. 7, by driving the engine 40, the compressor 30 is operated, and the vaporized refrigerant flowing in the refrigerant return pipe 32 is sucked into the compressor, compressed to a high temperature and high pressure state, and then passed from the discharge port to the refrigerant return pipe. It is discharged into piping 31.

The high-temperature vapor phase refrigerant flowing into the condenser A1 from the refrigerant population 3A passes through the cooling water inlet in the cylindrical case 1 while following the inside of the helical tube 3 and heading toward the refrigerant outlet 3B, as shown in FIG. The water flows into the case from the tube 8 and exchanges heat with the cooling water flowing out into the tube 9 to be turned into a cooling liquid.

As described above, the spiral flow channel B is formed in the cylindrical case 1 so as to follow the spiral shape of the helical tube 3, so that the inside of the helical tube 3 and the spiral flow channel B are formed.
The refrigerant and the cooling water each follow a flow path having approximately the same length, while maintaining contact with each other through the 'II of the tube 3, and avoiding turbulence caused by the swirling of the water flow. This results in a heat exchange performance equivalent to that of the double-tube heat exchanger mentioned at the beginning, and liquefies the gas phase refrigerant extremely efficiently.

A part of the liquefied refrigerant is sent to the water cooler 2, and while passing through an expansion valve (not shown) provided at the inlet thereof, the pressure is reduced to a gas-liquid two-layer state, and then the helical tube 3 flows into. Since the water to be cooled pumped up from the tank 60 by the pump 63 flows into the cooling rotary tube 8 of the cylindrical case 1, the refrigerant cools this warm water by removing the latent heat of vaporization from it. At the same time, the refrigerant itself returns to the gaseous phase, is sucked into the compressor 30 via the return pipe 32, and is recompressed.

The cooled water is returned to the tank 60 via the return vibro 4, and then repeatedly fed into the cylindrical case 1.

The remaining part of the liquefied refrigerant discharged from the condenser A1 is supplied to the evaporator 33, which serves as a heat exchanger for generating cold air, and
An air blower (not shown) removes the latent heat of vaporization from the hot air blown to the evaporator to generate cold air, which returns to the gas phase and is sucked into the compressor 30 again.

As time passes, impurities and microorganisms contained in the cooling water gradually adhere and accumulate inside the cylindrical case 1 that forms the condenser A1 and the water-cooled tank Δ2. Replacement performance deteriorates over time.

In that case, the cleaning work to remove these deposits can be done very easily and quickly, just like with shell-eyed heat exchangers.

That is, the helical tube 3 remains fixed to the cover 2 by unfastening the bolts 12 and 13 which press and fix the cover 2 to the upper open cylinder end a of the cylindrical case 1. , are handled from inside the cylindrical case 1. Next, when the lower end of the baffled middle tube 4, which is sandwiched between the hollow part of the helical tube 3 and the pitch gap between the tubes, is twisted and pulled, the baffled middle tube 4 can be easily and quickly removed from the helical tube 3. It can be handled from.

Therefore, the work of removing foreign matter adhering to each of these disassembled parts can be done quickly and reliably. Once cleaned, each part can be reassembled in a very short time by reversing the disassembly process.

In order to recognize the effectiveness of the baffled middle cylinder 4 for improving heat exchange performance, which characterizes the structure of the heat exchanger according to the present invention, the heat exchanger shown in FIG. Figure 9 shows part of the data from a series of experiments comparing the performance of the heat exchanger in Figure 1 with a conventional shell-and-coil heat exchanger, which has the same structure and dimensions as the heat exchanger. This is shown graphically in FIG.

The experiment was conducted using these heat exchangers as the condenser A1 of the refrigeration cycle shown in FIG. 7 under the same refrigeration cycle operating conditions. The solid line graph in the figure is a graph drawn by the present invention, and the dashed-dot line graph is a graph drawn by a conventional heat exchanger.

The more the flow of cold water flowing inside the cylindrical case 1 is increased,
The value of the heat transfer coefficient αW of the heat exchanger increases, and when the cold section water flow rate is 30 J/ff1in, αW of the example heat exchanger is about 75% compared to the conventional heat exchanger. It can be seen from the graph in FIG. 9 that this can be improved.

Furthermore, it can be seen from FIG. 10 that the heat exchange capacity Qw of the embodiment heat exchanger is improved by nearly 10% compared to that of the conventional type when the cooling water flow rate is in the range of 20 to 40 J/l1lin.

FIG. 8 is a partially enlarged side sectional view of a second embodiment of the heat exchanger according to the present invention. The difference from the first embodiment is that two cylindrical helical cultiforms 1-7103 and 203, which have the same tube helical pitch but different cylinder diameters, are used in a reactive combination.

In large-scale refrigeration systems with a high refrigerant charging VAI, it is necessary to keep the pressure loss of the refrigerant due to the heat exchanger interposed in the refrigerant flow path as low as possible. Therefore, an effective countermeasure is to branch the refrigerant flow paths in the heat exchanger into parallel states. However, as mentioned in the beginning, in the conventional two-tube heat exchanger, the upper flow paths of the structure are parallelized. It is extremely difficult to do so.

However, in the heat exchanger of this embodiment, as shown in FIG. By simply expanding the width to correspond to the horizontal 111 expansion of the type helical coil, parallel heat exchange channels can be formed in this heat exchanger, which has a structure similar to a double tube heat exchanger. .

The above embodiment describes the h method in which the refrigerant used in refrigeration equipment is cooled using cooling water, but various fluids other than refrigerant can be used as the second heat exchange fluid, and in some cases Depending on the situation, a fluid other than water may be freely selected as the first heat exchange fluid.

In addition, the shapes and structures of the cylindrical case and helical tube, the means for attaching and detaching the lid, and the means for fixing the tube end of the helical duplex are merely examples.
The object of the present invention can be achieved even if the installation is changed appropriately depending on the age.

[Brief explanation of the drawing]

Figures 1 and 4 both show a heat exchanger according to an embodiment of the present invention, with Figure 1 being a side sectional view and Figure 2 being a 1
FIG. 3 is an exploded view, and FIG. 4 is a partial side sectional view of the baffled inner cylinder. FIGS. 5 and 6 are an exploded view and an assembled view, respectively, of another example of the structure of the baffle pipe middle cylinder. Figure 7 shows two heat exchangers, one of which is used as a refrigerant condenser and the other as a water cooler (evaporator) for cooling the water in the fish tank. - It is a cycle diagram showing an example of use by incorporating it into one refrigeration cycle. FIG. 8 is a partially enlarged side sectional view of a second embodiment of the heat exchanger according to the present invention. FIGS. 9 and 10 are data graphs of a series of experiments comparing the advantages and disadvantages of the heat exchanger assembly structure according to the present invention with the conventional one. In the figure 1... cylindrical case, 2... lid body,
3... Helical cube 1-b, 3A, 3B...
Inlet and outlet of second heat exchange fluid 4... Middle cylinder with baffle, 5... Spiral balanor, 6.7... Fixing means 8.9... Inlet of first heat exchange fluid ” and exit 1
", 12.13... Attachment and detachment means

Claims (1)

[Scope of Claims] (a) Forms a heat exchange flow path for water as the first heat exchange fluid, has an inlet and an outlet at both ends of the cylinder, and has a lid attached to and detachable from one open end of the cylinder. (b) a disc-shaped helical tube housed within the case and forming a flow path for a second heat exchange fluid; (c)
(d) a fixing means for inserting and fixing both cylindrical ends of the helical tube into the lid; (d) having an outer diameter that has a pitch equivalent to the helical pitch of the helical tube and that can be inserted into the cylindrical case; A heat exchanger assembly structure comprising: a helical baffle provided on the outer peripheral surface thereof, and a baffled inner cylinder housed in a hollow part of the helical tube.