JPH11230685A - Heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress an adherence of a deposit and a fouling and to prolong a lifetime by piping a heat transfer tube of a heat exchanger installed at a flushing line of a mechanical seal in the state using an entirety in a shell as a refrigerant passage, thereby delaying a precipitation of a component contained in a medium. SOLUTION: The heat exchanger 1 provided to protect a mechanical seal provided at a bearing of a pump as installed at a flushing line for circulating a fluid A to be sealed from a high pressure side of a pump to a stuffing box comprises a heat transfer tube 3 single wound in a coiled state and piped in a cylindrical shell 2. And, the fluid A is fed into the tube 3 connected at its both ends to a fluid supply port 5 and a fluid discharge port 6. The fluid A is cooled by removing heat of the fluid A by a refrigerant (cooling water) B supplied into the shell 2 to a refrigerant supply port 7 to a refrigerant discharge port 8 during flowing of the fluid A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger installed in a flushing line of a mechanical seal provided in a bearing portion of, for example, a pump, a stirrer, a blower or the like.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger as described above, for example, as shown in FIG. 3, a single conventional heat transfer tube 23 (for example, a tube) is provided inside a shell 22 in a first conventional example. A heat exchanger 21 and, as shown in FIG.
There is a heat exchanger 21 of a second conventional example in which a double-wrapped heat transfer tube 23 is provided inside.

In the former heat exchanger 21, a baffle 29 (for example, a partition plate) is disposed inside a coil portion 23a formed in the heat transfer tube 23. In the latter heat exchanger 21, a baffle 29 is provided inside a coil portion 23a formed in the heat transfer tube 23, and a baffle 30 is provided inside a coil portion 23b formed smaller in diameter than the coil portion 23a. I have.

At the time of cooling, the sealed fluid A supplied into the heat transfer tube 23 is supplied from the fluid supply port 25 to the fluid discharge port 26.
And the cooling water B transferred from the refrigerant supply port 27 to the refrigerant discharge port 28 to the coil portions 23a and 23b of the heat transfer tube 23 piped between the shell 22 and the baffle 29 and between the baffles 29 and 30. And the sealed fluid A
Is transferred to the cooling water B to be cooled.

[0005]

However, the above-described heat exchanger 21 reduces the cross-sectional area of the passage formed between the shell 22 and the baffle 29 and between the baffles 29 and 30 so that the cooling water B Although the heat transfer efficiency is set to be increased by increasing the flow rate, a high temperature (for example, about 150 ° C.
Since the sealed fluid A of about 200 ° C. is supplied, the temperature of the cooling water B coming into contact with the fluid becomes high enough to boil, and the inorganic substances C (for example, silica, salt,
(Such as calcium) precipitates in a short period of time, and the hard inorganic substance C adheres to the peripheral surface of the heat transfer tube 23, so that the heat transfer efficiency deteriorates.

Since the cooling action is hindered by the adhesion of the inorganic substance C and the sealed fluid A is transferred in a high temperature state, the same phenomenon occurs sequentially along the entire length of the heat transfer tube 23, and the entire circumference of the heat transfer tube 23 Inorganic substances adhere to the surface. In addition, the adhesion area of the inorganic substance C and the accumulation amount thereof increase, and not only the cross-sectional area of the passage becomes narrow, but also fouling that hinders the flow of the cooling water B occurs, so that the heat transfer coefficient and the cooling efficiency deteriorate, There is a problem that the operation of the mechanical seal is hindered.

When the cooling capacity is reduced due to fouling, the heat exchanger 21 must be periodically disassembled and cleaned, but the shell 22, the heat transfer tube 23, the baffle 2
Since a large amount of the inorganic substance C may be fixed to the surfaces 9 and 30, when the heat transfer tube 23 is taken out of the shell 22, the heat transfer tube 23 may be deformed or damaged. In addition, since the internal structure of the shell 22 is complicated, the heat exchanger 21 is not connected to the flushing line of the mechanical seal.
Cleaning is impossible without completely removing it, and there is also a problem that the work is troublesome and time-consuming.

Further, the metal 22 (for example, iron such as steel pipe for pipes (SGP or STPT)) and the wetted portions of the baffles 29 and 30 are coated with a rust preventive paint, and rust is generated on the metal portions. However, there is also a problem that the coating film is peeled off by the influence of the inorganic substance C attached to the portion, and fouling is promoted.

In view of the above-mentioned problems, according to the present invention, since the heat transfer pipe is arranged so that the entire inside of the shell is used as a refrigerant passage, the precipitation of components contained in the medium is delayed, and the deposition of deposits and fouling are prevented. The occurrence of a ring can be suppressed, and the life can be extended. Further, it is an object of the present invention to provide a heat exchanger that can easily and easily perform an operation of removing attached deposits.

[0010]

According to the first aspect of the present invention,
The sealed fluid flows along the heat transfer pipe piped inside the shell from the fluid supply port formed in the shell to the fluid discharge port. A heat exchanger that flows the supplied refrigerant, transfers heat of the sealed fluid flowing inside the heat transfer tube to the refrigerant, and cools the heat transfer tube, wherein the heat transfer tube has the entire inside of the shell as a refrigerant passage. It is characterized in that it is a heat exchanger piped to be used.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, a heat exchanger is provided such that a lid can be opened and closed with respect to an opening formed in the shell side portion. And

According to a third aspect of the present invention, in addition to the configuration of the first aspect, the entire heat exchanger or a portion of the heat exchanger that is in contact with the liquid is made of a metal having an excellent property of preventing deposits from adhering. It is a heat exchanger.

[0013]

In the heat exchanger according to the first aspect, the sealed fluid supplied into the heat transfer tube flows from the fluid supply port to the fluid discharge port along the heat transfer tube provided inside the shell. at the same time,
Refrigerant (for example, cooling water, cooling liquid,
Coolant) flows from the refrigerant supply port to the refrigerant discharge port while being in contact with the entire circumference of the heat transfer tube, and the entire inside of the shell is used as a refrigerant passage, so that the heat of the sealed fluid flowing inside the heat transfer tube is reduced. Because it is efficiently diffused into a wide area by the refrigerant,
The refrigerant can be kept at a temperature lower than the boiling temperature, and the precipitation of components contained in the refrigerant is delayed. In addition, it is possible to prevent deposits from adhering to the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube and to prevent fouling.

According to a second aspect of the present invention, there is provided a heat exchanger.
In addition to the action described, even if components (eg, inorganic substances such as silica, salt, and calcium) contained in the medium precipitate and the deposited precipitate adheres to the heat transfer tube, the lid is removed from the opening of the shell. Since the heat exchanger is removed and fully opened, the inside of the heat exchanger can be reliably cleaned to every corner, and the cooling function is immediately restored. In addition, the operation of removing precipitates attached to the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube can be performed easily and easily.

According to a third aspect of the present invention, there is provided a heat exchanger.
Along with the operation described, the entire heat exchanger or the liquid contact part of the heat exchanger is made of a metal having excellent rust prevention properties, such as stainless steel and titanium, so that the rate of deposition of the precipitate is suppressed. In addition, since the accumulated amount is significantly reduced, the cleaning time can be extended.

[0016]

According to the present invention, since the entire interior of the shell constituting the heat exchanger is used as a refrigerant passage, the cross-sectional area of the refrigerant passage is wider than that of the conventional heat exchanger, and the inside of the heat transfer tube is improved. Since the heat of the sealed fluid flowing through the refrigerant is efficiently transmitted to the refrigerant over a wide area, the refrigerant can always be kept at a temperature lower than the boiling temperature.

Moreover, the precipitation of the components contained in the refrigerant is delayed, and the deposition of precipitates on the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube and the occurrence of fouling can be suppressed. The life can be extended. In addition, it is possible to cool to a temperature at which the function of the mechanical seal is maintained, and it is possible to prevent the sealing function from lowering or being impaired.

Further, when the deposits adhere to the heat transfer tubes and their cooling ability is reduced, the lid is removed from the opening of the shell and the entire surface is opened, so that the cleaning work is performed by an obstacle such as a baffle as in the conventional example. The heat exchanger is not hindered and only the heat transfer tubes are provided inside the shell, so the internal structure is extremely simple and simple, and the inside of the heat exchanger can be completely cleaned without fail. The cooling function can be restored immediately. In addition, the operation of removing the deposit attached to the shell and the heat transfer tube can be easily and easily performed, and the workability at the time of cleaning is improved.

Furthermore, since the entire heat exchanger or its liquid-contacting part is formed of a metal having excellent rust-preventive properties, it is not necessary to cover it with a rust-preventive paint as in the prior art. The cleaning speed is suppressed, and the accumulated amount is greatly reduced, so that the cleaning time can be extended. In addition, the adhesion of the precipitate is weaker than the conventional example, the precipitate can be easily peeled and removed, and the heat exchanger can be easily cleaned.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows a heat exchanger according to a first embodiment which is installed on a flushing line of a mechanical seal provided in a bearing portion of a pump (not shown). In FIG. It is installed in a flushing line that circulates the sealed fluid A from the high pressure side of the pump to the stuffing box, such as end self-flushing, to protect the mechanical seal provided in the bearing of the pump and to stabilize the function.

In the heat exchanger 1 described above, a single-winding heat transfer tube 3 wound in a coil shape is provided inside a cylindrical shell 2.

The shell 2 is formed in a size and length capable of storing a single-winding heat transfer tube 3 wound in a coil shape, and has an opening 2a formed at one end and an opening formed at the other end. The lid 4 is fitted and fixed to the portion 2b so as to be in close contact with the portion 2b.

A fluid supply port 5 for supplying the sealed fluid A to the inside of the heat transfer tube 3 is provided in the lid 4 fitted on one end side.
And a fluid discharge port 6 for discharging the sealed fluid A to the outside of the heat transfer tube 3. The fluid supply port 5 is connected to a high pressure side of a pump (not shown) via a supply line, and the fluid discharge port 6 is connected to a stuffing box of the pump (not shown) via a supply line.

On the other hand, a coolant supply port 7 for supplying cooling water B (for example, CaOH, concentration 15% = solution) is formed at the center of the lid 4 fitted to the other end side. A refrigerant discharge port 8 for discharging the cooling water B is provided on the upper surface on one end side.
Is formed. The coolant supply port 7 and the coolant discharge port 8 are connected to a coolant supply device (not shown) for circulating and cooling the cooling water B. Note that, instead of the cooling water B, for example, a coolant such as a coolant or a coolant may be used.

The heat transfer tube 3 extends along the inner peripheral surface of the shell 2
A single-wound coil portion 3a wound in a coil shape is piped and set so that, for example, the heat exchange area is about 0.24 m ² . The end 3 c of the heat transfer tube 3 is connected to a fluid supply port 5 formed in the lid 4, and the end 3 d is connected to a fluid discharge port 6. The heat transfer tube 3 is connected to the shell 2
The pipe may meander in the circumferential direction or the length direction along the inner peripheral surface of the pipe.

The lid 4 is connected to the opening 2 of the shell 2 via a sealing member 9 such as a gasket or a packing ring.
a flange portion 10 formed on the fitting side peripheral portion of the shell 2 and a flange portion 11 formed on the fitting side peripheral portion of the lid 4 are bolted to each other.
And a nut 13 for fastening.

A shell 2 constituting the heat exchanger 1;
Heat transfer tube 3, lid 4, and other parts 5, 6, 7, 8,
10 and 11 are made of, for example, a metal such as stainless steel or titanium which is excellent in rust prevention and adhesion prevention of inorganic substance C (formed of stainless steel in the embodiment). In addition, the sealed fluid A
Alternatively, only the liquid contact portion that comes into contact with the cooling water B may be formed or covered with the above-described metal.

The illustrated embodiment is configured as described above, and the cooling operation by the heat exchanger 1 will be described below. First, the high temperature discharged from the high pressure side of the pump (for example, about 15
Fluid A having a predetermined temperature in the range of 0 ° C. to about 200 ° C.)
Is supplied to the heat transfer tube 3 provided inside the shell 2 through a fluid supply port 5 formed at one end of the heat exchanger 1. The sealed fluid A supplied into the heat transfer tube 3 is transferred from the fluid supply port 5 to the fluid discharge port 6 along the coil portion 3a of the heat transfer tube 3.

On the other hand, cooling water B supplied from a refrigerant supply device (not shown) is supplied into the inside of the shell 2 through a refrigerant supply port 7 formed at the other end of the heat exchanger 1 (for example, 1 MPa).
= 10 kg and supplied). The cooling water B supplied to the inside of the shell 2 is transferred from the refrigerant supply port 7 to the refrigerant discharge port 8 while uniformly contacting the entire circumference of the coil portion 3 a of the heat transfer tube 3.

During the transfer from the fluid supply port 5 to the fluid discharge port 6, the heat of the sealed fluid A flowing inside the heat transfer tube 3 is transmitted to the cooling water B supplied inside the shell 2. Then, the sealed fluid A discharged from the fluid discharge port 6 is cooled to a predetermined temperature (for example, in a range of about 60 ° C. to about 80 ° C.). Preferably, cooling to about 60 ° C for water and about 80 ° C for oil is optimal.

The sealed fluid A cooled to a predetermined temperature is supplied to a mechanical seal provided in a bearing portion of a pump (not shown) to cool the mechanical seal to a temperature at which the sealing function is maintained. Can be prevented or the function can be prevented from being reduced.

As described above, since the entire inside of the shell 2 constituting the heat exchanger 1 is used as a passage for the cooling water B,
Since the passage cross-sectional area of the cooling water B is wider than that of the heat exchanger 21 of the conventional example, the heat of the sealed fluid A flowing inside the heat transfer tube 3 is efficiently transmitted to the cooling water B to a wide area. B
Can always be kept at a temperature lower than the boiling temperature.

Moreover, the precipitation of the components contained in the cooling water B is delayed, and the adhesion of the inorganic substance C to the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 and the occurrence of fouling are suppressed. And the life can be extended. In addition, the sealed fluid A can be cooled to a temperature at which the function of the mechanical seal is maintained, so that the sealing function can be prevented from being reduced or impaired.

Further, when the inorganic substance C adheres to the peripheral surface of the heat transfer tube 3 and the cooling capacity is reduced, the lid 4 is removed from the opening 2b of the shell 2 without removing the flushing line from the mechanical seal portion. Since the interior of the shell 2 is entirely open, the cleaning work is not hindered by obstacles such as the baffles 29 and 30 as in the conventional example, and only the heat transfer tube 3 is provided inside the shell 2. Its internal structure is extremely simple and simple, the inside of the heat exchanger 1 can be reliably cleaned to every corner, and the cooling function can be immediately restored. In addition, the operation of removing the inorganic substance C adhered to the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 can be performed easily and easily, and the workability at the time of cleaning is improved.

After removing the lid 4 from the opening 2a of the shell 2 and pulling the heat transfer tube 3 out of the shell 2, the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 may be cleaned. . Further, the cleaning operation may be performed by removing the lid 4 fitted to the openings 2a and 2b.

Further, since the entire heat exchanger 1 is made of stainless steel, it is not necessary to cover the heat exchanger with a rust-preventive paint as in the conventional example. Since the cleaning time is greatly reduced, the cleaning time can be extended. In addition, the adhesion of the inorganic substance C is weaker than in the conventional example, the inorganic substance C can be easily peeled and removed, and the heat exchanger 1 can be easily cleaned.

FIG. 2 shows a heat exchanger 1 according to a second embodiment in which a double-wrapped heat transfer tube 3 is provided inside a shell 2.
The other parts except for the above are substantially the same in configuration as the heat exchanger 1 of the above-described first embodiment, and the description thereof will be omitted.

The heat transfer tube 3 extends along the inner peripheral surface of the shell 2,
A first coil portion 3a wound to a diameter smaller than the inner diameter of the shell 2 is piped, and a second coil wound to a diameter smaller than the inner diameter of the coil portion 3a along the inner peripheral surface of the coil portion 3a.
And the heat exchange area is set to about 0.4 m ² , for example.

The center of the lid 4 corresponding to the coolant supply port 8 is of a size and shape that can communicate with the coolant supply port 8 and can be inserted into the center of the coil portion 3b. Short cylindrical support plate 1 formed with a smaller diameter than the inner diameter of portion 3b
4 is fixed.

The support plate 14 is fixed so as to be slightly inserted into the center of the end of the coil portion 3b, and supports the coil portions 3a and 3b in a state parallel to the entire length of the shell 2 (for example, in a horizontal state or a vertical state). ), The ends of the coil portions 3a and 3b are positively prevented from being displaced in the radial direction when the sealed fluid A and the cooling water B are transferred, and are prevented from swaying. A plurality of holes (not shown) may be formed on the outer peripheral surface of the support plate 14 to improve the fluidity of the cooling water B.

The heat exchanger 1 is configured such that the cooling water B supplied to the inside of the shell 2 is brought into uniform contact with the entire circumference of the coil portions 3a and 3b of the heat transfer tube 3 while the cooling water B is supplied from the refrigerant supply port 7 to the refrigerant discharge port 8 And the heat of the sealed fluid A flowing inside the heat transfer tube 3 is transferred to the cooling water B, so that the double-wrapped heat transfer tube 3 is better than the single-wrapped heat transfer tube 3 of the first embodiment. However, the heat exchange area is large and the heat transfer efficiency is high. Further, it is suitable for cooling the sealed fluid A at a high temperature (for example, about 200 ° C. or higher), and can provide the same operation and effects as those of the first embodiment.

In the correspondence between the structure of the present invention and the above-described embodiment, the precipitate of the present invention corresponds to the inorganic substance C of the embodiment, and similarly, the refrigerant corresponds to the cooling water B. The invention is not limited only to the configuration of the above-described embodiment.

In the above-described embodiment, an example has been described in which the heat exchanger is installed on a flushing line for dead-end self-flashing. However, the heat exchanger may be installed on a flushing line such as a pump-through flashing. The application is not limited only to the flushing line. Further, it may be used for a flushing line for a mechanical seal provided in a bearing portion such as a stirrer or a blower.

[Brief description of the drawings]

FIG. 1 is a side view showing a heat exchanger of a first embodiment in which a single-turn heat transfer tube is provided.

FIG. 2 is a side view showing a heat exchanger of a second embodiment in which double-wrapped heat transfer tubes are provided.

FIG. 3 is a side view showing a first conventional heat exchanger.

FIG. 4 is a side view showing a second conventional heat exchanger.

[Explanation of symbols]

 A: sealed fluid B: cooling water C: inorganic substance 1 ... heat exchanger 2 ... shell 2a, 2b ... opening 3 ... heat transfer tube 3a, 3b ... coil 4 ... lid 5 ... fluid supply port 6 ... fluid discharge port 7: Refrigerant supply port 8: Refrigerant discharge port

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[Procedure amendment]

[Submission date] February 5, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Heat exchanger

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger installed in a flushing line of a mechanical seal provided in a bearing portion of, for example, a pump, a stirrer, a blower or the like.

[0002]

2. Description of the Related Art Conventionally, as a heat exchanger as described above, for example, as shown in FIG. 3, a single conventional heat transfer tube 23 (for example, a tube) is provided inside a shell 22 in a first conventional example. A heat exchanger 21 and, as shown in FIG.
There is a heat exchanger 21 of a second conventional example in which a double-wrapped heat transfer tube 23 is provided inside.

In the former heat exchanger 21, a baffle 29 (for example, a partition plate) is disposed inside a coil portion 23a formed in the heat transfer tube 23. In the latter heat exchanger 21, a baffle 29 is provided inside a coil portion 23a formed in the heat transfer tube 23, and a baffle 30 is provided inside a coil portion 23b formed smaller in diameter than the coil portion 23a. I have.

At the time of cooling, the sealed fluid A supplied into the heat transfer tube 23 is supplied from the fluid supply port 25 to the fluid discharge port 26.
And the cooling water B transferred from the refrigerant supply port 27 to the refrigerant discharge port 28 to the coil portions 23a and 23b of the heat transfer tube 23 piped between the shell 22 and the baffle 29 and between the baffles 29 and 30. And the sealed fluid A
Is transferred to the cooling water B to be cooled.

[0005]

However, the above-described heat exchanger 21 reduces the cross-sectional area of the passage formed between the shell 22 and the baffle 29 and between the baffles 29 and 30 so that the cooling water B Although the heat transfer efficiency is set to be increased by increasing the flow rate, a high temperature (for example, about 150 ° C.
Since the sealed fluid A of about 200 ° C. is supplied, the temperature of the cooling water B coming into contact with the fluid becomes high enough to boil, and the inorganic substances C (for example, silica, salt,
(Such as calcium) precipitates in a short period of time, and the hard inorganic substance C adheres to the peripheral surface of the heat transfer tube 23, so that the heat transfer efficiency deteriorates.

Since the cooling action is hindered by the adhesion of the inorganic substance C and the sealed fluid A is transferred in a high temperature state, the same phenomenon occurs sequentially along the entire length of the heat transfer tube 23, and the entire circumference of the heat transfer tube 23 Inorganic substances adhere to the surface. In addition, the adhesion area of the inorganic substance C and the accumulation amount thereof increase, and not only the cross-sectional area of the passage becomes narrow, but also fouling that hinders the flow of the cooling water B occurs, so that the heat transfer coefficient and the cooling efficiency deteriorate, There is a problem that the operation of the mechanical seal is hindered.

When the cooling capacity is reduced due to fouling, the heat exchanger 21 must be periodically disassembled and cleaned, but the shell 22, the heat transfer tube 23, the baffle 2
Since a large amount of the inorganic substance C may be fixed to the surfaces 9 and 30, when the heat transfer tube 23 is taken out of the shell 22, the heat transfer tube 23 may be deformed or damaged. In addition, since the internal structure of the shell 22 is complicated, the heat exchanger 21 is not connected to the flushing line of the mechanical seal.
Cleaning is impossible without completely removing it, and there is also a problem that the work is troublesome and time-consuming.

Furthermore, the metal 22 (for example, a steel pipe 22 for piping (SGP or STPT)) made of iron or the like and the wetted portions of the baffles 29 and 30 are coated with a rust preventive paint, and rust is generated on the metal portion. However, there is also a problem that the coating film is peeled off due to the effect of the inorganic substance C attached to the portion and fouling is promoted.

SUMMARY OF THE INVENTION In view of the above problems, the present invention lays out the heat transfer pipe in a state where the entire inside of the shell is used as a refrigerant passage, thereby delaying the deposition of components contained in the medium, and preventing the deposition of deposits and It is possible to suppress the occurrence of fouling and extend the life. Further, it is an object of the present invention to provide a heat exchanger that can easily and easily perform an operation of removing attached deposits.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a fluid to be sealed is caused to flow from a fluid supply port formed in a shell to a fluid discharge port along a heat transfer pipe provided inside the shell, and a refrigerant formed in the shell is formed. A heat exchanger for flowing a refrigerant supplied to the inside of the shell from a supply port to a refrigerant discharge port, and transferring heat of the sealed fluid flowing inside the heat transfer tube to the refrigerant to cool the heat exchanger. The heat pipe is piped so that the entire inside of the shell is used as a passage for the refrigerant, and
The lid can be opened and closed with respect to the opening formed in the
The entire heat exchanger or the part of the heat exchanger that is in contact with the liquid
Made of metal with excellent anti-adhesion properties, pump, stirrer, blower
Of mechanical seals provided in bearings
It is a heat exchanger installed on a sing line .

[0011]

According to the heat exchanger of the present invention, the sealed fluid supplied into the heat transfer tube flows from the fluid supply port to the fluid discharge port along the heat transfer tube provided inside the shell. At the same time, the coolant (eg, cooling water, coolant, coolant, etc.) supplied to the inside of the shell is caused to flow from the coolant supply port to the coolant discharge port while being in contact with the entire circumference of the heat transfer tube, and the entire inside of the shell is passed through the coolant passage. Because the heat of the sealed fluid flowing inside the heat transfer tube is efficiently diffused into the refrigerant over a wide area, the refrigerant can be kept at a temperature lower than the boiling temperature, and the components contained in the refrigerant can be used. Precipitation slows down. In addition, it is possible to prevent deposits from adhering to the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube and to prevent fouling.

Further, even if components (for example, inorganic substances such as silica, salt, and calcium) contained in the medium precipitate and the deposited precipitate adheres to the heat transfer tube, the lid is removed from the opening of the shell. Since the heat exchanger is fully open, the inside of the heat exchanger can be reliably cleaned to every corner, and the cooling function is immediately restored. In addition, the operation of removing precipitates attached to the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube can be performed easily and easily.

[0013] Further, by forming the entire heat exchanger or the liquid-contacting portion of the heat exchanger with a metal having excellent rust prevention properties such as stainless steel and titanium, the rate of deposition of the precipitates is suppressed, Since the accumulated amount is greatly reduced, the cleaning time can be extended.

[0014]

According to the present invention, since the entire interior of the shell constituting the heat exchanger is used as a refrigerant passage, the cross-sectional area of the refrigerant passage is wider than that of the conventional heat exchanger, and the inside of the heat transfer tube is improved. Since the heat of the sealed fluid flowing through the refrigerant is efficiently transmitted to the refrigerant over a wide area, the refrigerant can always be kept at a temperature lower than the boiling temperature.

Further, the precipitation of the components contained in the refrigerant is delayed, and it is possible to suppress the deposits from adhering to the inner peripheral surface of the shell and the outer peripheral surface of the heat transfer tube and to prevent fouling from occurring. The life can be extended. In addition, it is possible to cool to a temperature at which the function of the mechanical seal is maintained, and it is possible to prevent the sealing function from lowering or being impaired.

Further, when the deposits adhere to the heat transfer tubes and their cooling ability is reduced, the lid is removed from the opening of the shell and the whole surface is opened, so that the cleaning work is performed by an obstacle such as a baffle as in the conventional example. The heat exchanger is not hindered and only the heat transfer tubes are provided inside the shell, so the internal structure is extremely simple and simple, and the inside of the heat exchanger can be completely cleaned without fail. The cooling function can be restored immediately. In addition, the operation of removing the deposit attached to the shell and the heat transfer tube can be easily and easily performed, and the workability at the time of cleaning is improved.

Further, since the entire heat exchanger or the liquid contact portion thereof is formed of a metal having excellent rust prevention properties, it is not necessary to cover the heat exchanger with a rust-preventive paint as in the conventional example. The cleaning speed is suppressed, and the accumulated amount is greatly reduced, so that the cleaning time can be extended. In addition, the adhesion of the precipitate is weaker than the conventional example, the precipitate can be easily peeled and removed, and the heat exchanger can be easily cleaned.

In particular, the heat exchanger of the present invention comprises a pump,
Mechanical mechanism installed in bearings such as stirrers and blowers
Effective protection and functional stability of the
You.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. The drawing shows a heat exchanger according to a first embodiment which is installed on a flushing line of a mechanical seal provided in a bearing portion of a pump (not shown). In FIG. It is installed in a flushing line that circulates the sealed fluid A from the high pressure side of the pump to the stuffing box, such as end self-flushing, to protect the mechanical seal provided in the bearing of the pump and to stabilize the function.

In the heat exchanger 1 described above, a single-winding heat transfer tube 3 wound in a coil shape is provided inside a cylindrical shell 2.

The shell 2 is formed in a size and length capable of storing a single-turn heat transfer tube 3 wound in a coil shape, and has an opening 2a formed at one end and an opening formed at the other end. The lid 4 is fitted and fixed to the portion 2b so as to be in close contact with the portion 2b.

A fluid supply port 5 for supplying the sealed fluid A to the inside of the heat transfer tube 3 is provided in the lid 4 fitted on one end side.
And a fluid discharge port 6 for discharging the sealed fluid A to the outside of the heat transfer tube 3. The fluid supply port 5 is connected to a high pressure side of a pump (not shown) via a supply line, and the fluid discharge port 6 is connected to a stuffing box of the pump (not shown) via a supply line.

On the other hand, a coolant supply port 7 for supplying cooling water B (for example, CaOH, a concentration of 15% = solution) is formed at the center of the lid 4 fitted to the other end side. A refrigerant discharge port 8 for discharging the cooling water B is provided on the upper surface on one end side.
Is formed. The coolant supply port 7 and the coolant discharge port 8 are connected to a coolant supply device (not shown) for circulating and cooling the cooling water B. Note that, instead of the cooling water B, for example, a coolant such as a coolant or a coolant may be used.

The heat transfer tube 3 extends along the inner peripheral surface of the shell 2,
A single-wound coil portion 3a wound in a coil shape is piped and set so that, for example, the heat exchange area is about 0.24 m2. The end 3 c of the heat transfer tube 3 is connected to a fluid supply port 5 formed in the lid 4, and the end 3 d is connected to a fluid discharge port 6. The heat transfer tube 3 is connected to the shell 2
The pipe may meander in the circumferential direction or the length direction along the inner peripheral surface of the pipe.

The lid 4 is connected to the opening 2 of the shell 2 via a sealing member 9 such as a gasket or a packing ring.
a flange portion 10 formed on the fitting side peripheral portion of the shell 2 and a flange portion 11 formed on the fitting side peripheral portion of the lid 4 are bolted to each other.
And a nut 13 for fastening.

A shell 2 constituting the heat exchanger 1;
Heat transfer tube 3, lid 4, and other parts 5, 6, 7, 8,
10 and 11 are made of, for example, a metal such as stainless steel or titanium which is excellent in rust prevention and adhesion prevention of inorganic substance C (formed of stainless steel in the embodiment). In addition, the sealed fluid A
Alternatively, only the liquid contact portion that comes into contact with the cooling water B may be formed or covered with the above-described metal.

The illustrated embodiment is configured as described above, and the cooling operation by the heat exchanger 1 will be described below. First, the high temperature discharged from the high pressure side of the pump (for example, about 15
Fluid A having a predetermined temperature in the range of 0 ° C. to about 200 ° C.)
Is supplied to the heat transfer tube 3 provided inside the shell 2 through a fluid supply port 5 formed at one end of the heat exchanger 1. The sealed fluid A supplied into the heat transfer tube 3 is transferred from the fluid supply port 5 to the fluid discharge port 6 along the coil portion 3a of the heat transfer tube 3.

On the other hand, cooling water B supplied from a refrigerant supply device (not shown) is supplied into the inside of the shell 2 through a refrigerant supply port 7 formed at the other end of the heat exchanger 1 (for example, 1 MPa).
= 10 kg and supplied). The cooling water B supplied to the inside of the shell 2 is transferred from the refrigerant supply port 7 to the refrigerant discharge port 8 while uniformly contacting the entire circumference of the coil portion 3 a of the heat transfer tube 3.

During the transfer from the fluid supply port 5 to the fluid discharge port 6, the heat of the sealed fluid A flowing inside the heat transfer tube 3 is transmitted to the cooling water B supplied inside the shell 2. Then, the sealed fluid A discharged from the fluid discharge port 6 is cooled to a predetermined temperature (for example, in a range of about 60 ° C. to about 80 ° C.). Preferably, cooling to about 60 ° C for water and about 80 ° C for oil is optimal.

The sealed fluid A cooled to a predetermined temperature is supplied to a mechanical seal provided in a bearing portion of a pump (not shown) to cool the mechanical seal to a temperature at which the sealing function is maintained. Can be prevented or the function can be prevented from being reduced.

As described above, since the entire inside of the shell 2 constituting the heat exchanger 1 is used as a passage for the cooling water B,
Since the passage cross-sectional area of the cooling water B is wider than that of the heat exchanger 21 of the conventional example, the heat of the sealed fluid A flowing inside the heat transfer tube 3 is efficiently transmitted to the cooling water B to a wide area. B
Can always be kept at a temperature lower than the boiling temperature.

Further, the precipitation of the components contained in the cooling water B is delayed, and the adhesion of the inorganic substance C to the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 and the occurrence of fouling are suppressed. And the life can be extended. In addition, the sealed fluid A can be cooled to a temperature at which the function of the mechanical seal is maintained, so that the sealing function can be prevented from being reduced or impaired.

Further, when the inorganic substance C adheres to the peripheral surface of the heat transfer tube 3 and the cooling capacity is reduced, the lid 4 is removed from the opening 2b of the shell 2 without removing the flushing line from the mechanical seal portion. Since the interior of the shell 2 is entirely open, the cleaning work is not hindered by obstacles such as the baffles 29 and 30 as in the conventional example, and only the heat transfer tube 3 is provided inside the shell 2. Its internal structure is extremely simple and simple, the inside of the heat exchanger 1 can be reliably cleaned to every corner, and the cooling function can be immediately restored. In addition, the operation of removing the inorganic substance C adhered to the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 can be performed easily and easily, and the workability at the time of cleaning is improved.

After removing the lid 4 from the opening 2a of the shell 2 and pulling the heat transfer tube 3 out of the shell 2, the inner peripheral surface of the shell 2 and the outer peripheral surface of the heat transfer tube 3 may be cleaned. . Further, the cleaning operation may be performed by removing the lid 4 fitted to the openings 2a and 2b.

Further, since the entire heat exchanger 1 is made of stainless steel, it is not necessary to coat the heat exchanger 1 with a rust-preventive paint as in the conventional example, the rate at which the inorganic substance C adheres is suppressed, and the amount of accumulation is reduced. Since the cleaning time is greatly reduced, the cleaning time can be extended. In addition, the adhesion of the inorganic substance C is weaker than in the conventional example, the inorganic substance C can be easily peeled and removed, and the heat exchanger 1 can be easily cleaned.

FIG. 2 shows a heat exchanger 1 according to a second embodiment in which a double-wrapped heat transfer tube 3 is provided inside a shell 2.
The other parts except for the above are substantially the same in configuration as the heat exchanger 1 of the above-described first embodiment, and the description thereof will be omitted.

The heat transfer tube 3 extends along the inner peripheral surface of the shell 2
A first coil portion 3a wound to a diameter smaller than the inner diameter of the shell 2 is piped, and a second coil wound to a diameter smaller than the inner diameter of the coil portion 3a along the inner peripheral surface of the coil portion 3a.
And the heat exchange area is set to about 0.4 m @ 2, for example.

The center of the lid 4 corresponding to the coolant supply port 8 has a size and a shape which can communicate with the coolant supply port 8 and can be inserted into the center of the coil portion 3b. Short cylindrical support plate 1 formed with a smaller diameter than the inner diameter of portion 3b
4 is fixed.

The support plate 14 is fixed so as to be slightly inserted into the center of the end of the coil portion 3b, and supports the coil portions 3a and 3b in a state parallel to the entire length of the shell 2 (for example, in a horizontal state or a vertical state). ), The ends of the coil portions 3a and 3b are positively prevented from being displaced in the radial direction when the sealed fluid A and the cooling water B are transferred, and are prevented from swaying. A plurality of holes (not shown) may be formed on the outer peripheral surface of the support plate 14 to improve the fluidity of the cooling water B.

The heat exchanger 1 is arranged such that the cooling water B supplied to the inside of the shell 2 is brought into uniform contact with the entire circumference of the coil portions 3 a and 3 b of the heat transfer tube 3 while the cooling water B is supplied from the refrigerant supply port 7 to the refrigerant discharge port 8. And the heat of the sealed fluid A flowing inside the heat transfer tube 3 is transferred to the cooling water B, so that the double-wrapped heat transfer tube 3 is better than the single-wrapped heat transfer tube 3 of the first embodiment. However, the heat exchange area is large and the heat transfer efficiency is high. Further, it is suitable for cooling the sealed fluid A at a high temperature (for example, about 200 ° C. or higher), and can provide the same operation and effects as those of the first embodiment.

In the correspondence between the structure of the present invention and the above-mentioned embodiment, the precipitate of the present invention corresponds to the inorganic substance C of the embodiment, and similarly, the refrigerant corresponds to the cooling water B. The invention is not limited only to the configuration of the above-described embodiment.

In the above-described embodiment, an example has been described in which the heat exchanger is installed on a flushing line for dead-end self-flushing. However, for example, the heat exchanger may be installed on a flushing line such as a pump-through flashing. The application is not limited only to the flushing line. Further, it may be used for a flushing line for a mechanical seal provided in a bearing portion such as a stirrer or a blower.

[Brief description of the drawings]

FIG. 1 is a side view showing a heat exchanger of a first embodiment in which a single-turn heat transfer tube is provided.

FIG. 2 is a side view showing a heat exchanger of a second embodiment in which double-wrapped heat transfer tubes are provided.

FIG. 3 is a side view showing a first conventional heat exchanger.

FIG. 4 is a side view showing a second conventional heat exchanger.

[Explanation of Signs] A: Sealed fluid B: Cooling water C: Inorganic substance 1 ... Heat exchanger 2 ... Shell 2a, 2b ... Opening 3 ... Heat transfer tube 3a, 3b ... Coil part 4 ... Lid 5 ... Fluid supply port 6: Fluid discharge port 7: Refrigerant supply port 8: Refrigerant discharge port

Claims (3)

[Claims] 1. A fluid to be sealed flows from a fluid supply port formed in a shell to a fluid discharge port along a heat transfer pipe provided inside the shell, and a refrigerant supply port formed in the shell to a refrigerant discharge port. A heat exchanger for flowing the refrigerant supplied to the inside of the shell to transfer the heat of the sealed fluid flowing inside the heat transfer tube to the refrigerant to cool the heat transfer tube, wherein the heat transfer tube is formed as a whole inside the shell. Heat exchanger which is piped so that it is used as a refrigerant passage. 2. The heat exchanger according to claim 1, wherein a lid is provided so as to be openable and closable with respect to an opening formed in the shell side portion. 3. The heat exchanger according to claim 1, wherein the heat exchanger as a whole or a part in contact with the heat exchanger is made of a metal having an excellent property of preventing deposits from adhering.