JPS5818597B2 - heat medium heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a closed type vapor phase heating medium heater.

Gas-phase heating medium heaters have excellent responsiveness to heat loads and have good temperature distribution uniformity, and sealed types have a simple structure and are lightweight, making them easy to integrate into equipment. It is widely used in synthetic fiber processing machines as a fiber heat treatment device.

An example of a conventional closed vapor phase heating medium heater will be explained based on FIGS. Dowsome A (trade name, composition is 73.5% diphenyl ether)
diphenyl (26.5%).

] is included. 4 is a heating element connected to a power source that detects the pressure or temperature inside the sealed container 1 and turns the power ON-OFF.
It is controlled by F.

Reference numeral 5 denotes a communicating path that communicates the upper portions of the plurality of steam paths 2 with each other to compensate for the difference in heat load, that is, steam consumption between the steam paths 2, to smooth the supply of steam and maintain a good temperature distribution. belongs to.

In the closed type vapor phase heat medium heater configured as described above, when electricity is applied to the heating body 4, the heat medium liquid 3 is heated and evaporated.
This heat medium vapor has a saturated vapor pressure corresponding to the set temperature and fills the closed container 1.

The vapor pressure inside the closed container 1 is approximately constant and the temperature is the same in all parts, and the steam condenses in response to an external heat load and takes away latent heat through the closed container 1.

When the amount of steam decreases, the temperature or pressure is detected and the power supply of the heating element 4 is controlled ON/OFF, so that the steam pressure inside the closed container 1 is always maintained at a constant pressure level or constant temperature.

To explain the movement of steam within the closed container 1 in more detail, the heat medium vapor evaporated by the heating of the heating element 4 passes through the steam path 2 and reaches the communication path 5 .

This steam gives the latent heat due to condensation to the external heat load via the closed container 1 according to the degree of heat dissipation in each part of the closed container 1, but the temperature inside the closed container 1 is controlled so that the constant pressure part 1 has a constant temperature. Therefore, the total amount of vapor loss is replenished one after another from the heat medium liquid level.

If we look at the movement of this steam as a whole, it forms a steam flow that starts at the liquid level of the heat transfer liquid 3, radiates heat and condenses in the steam path 2, and decreases until it reaches the communication path 5 and ends around it. However, since it is a fluid, a pressure drop occurs that is determined by the conductance and flow rate of the flow path.

In other words, when the amount of steam consumption increases, the flow rate increases and the flow velocity increases, causing a pressure drop of 71 × 71 × 71 × flow velocity, and the end point of the steam flow becomes the lowest pressure point in the closed container 1, resulting in an exceptionally high steam consumption. If there is a steam path with a large amount of steam, the pressure drop in that steam path will be greater, and the steam that has passed through other steam paths will be supplied to that steam path through the communication path 5 in the form of a reverse flow.

This is the main purpose of the communication passage 5. In this case, the steam passage becomes the end point of the steam flow, and since the upper part of the steam passage on both ends has a large amount of heat radiated to the outside air due to its structure, it depends on the heat insulation structure, but generally the first Points a and t) in the figure tend to be the end points of the vapor flow.

Note that if the conductance of the flow path is sufficiently maintained, the temperature drop due to the pressure drop can be ignored, and in this case, there will usually be multiple end points of the vapor flow.

On the other hand, during use, air and moisture (hereinafter referred to as low boiling point gases) released from the container's constituent materials and heat transfer fluid accumulate inside the closed container 1, and the pressure becomes negative in the normal operating temperature range. The airtight container of the heat medium heater requires a vacuum engineering manufacturing process, which requires a great deal of labor and skill, but even with today's advanced production technology, there is a limit to preventing the accumulation of the above-mentioned low-boiling gases. Accumulation of boiling point gases in closed containers is unavoidable.

This accumulation of low boiling point gas leads to poor temperature distribution in the heat medium heater.

In other words, since the low boiling point gas accumulated in the closed container 1 has a lower specific gravity than the heat medium vapor, it is gradually pushed upward by the heat medium vapor from the heat medium liquid level, and some parts are mixed with the heat medium vapor. However, most of it is directed to the end point of the steam flow by the steam flow, and finally, all the low boiling point gases are concentrated at the end point of the steam flow, and the heating medium vapor is blocked by this low boiling point gas.

As a result, the heat medium vapor is not supplied to the end point of the steam flow, and the temperature in this part decreases, and this range expands in proportion to the amount of low-boiling gas.When the end point of the steam flow reaches steam path 2, the temperature This will result in poor distribution.

In the conventional system described above, the communication passage 5 is provided above the steam passage 2, and the low boiling point gas is collected in the upper part of the communication passage 5 by utilizing the fact that the low boiling point gas has a lower specific gravity than the heat medium vapor. However, as mentioned above, the end points of the vapor flow usually tend to be points a, y, and b in Figure 1, and low-boiling gases gather at these points.

Temperature distribution defects also occur in this area in the early stages of occurrence.

This phenomenon was also observed in a confirmation experiment in which a relatively small amount of air was injected into the closed container 1.

In addition, the volume of the low-boiling gas in the closed container 1 is inversely proportional to the pressure inside the container in the operating temperature range of the heater. The effect of expansion of low-boiling point gas increases, making it easier to cause poor temperature distribution, but conversely, when a low-boiling point heat transfer liquid is used, the value of volume x pressure increases, which limits the pressure vessel (the value of volume x pressure remains constant). If this value is exceeded, it violates legal safety standards and requires the designation of a pressure vessel, approval from a public institution, and the need for a dedicated operator.

), so in order to avoid this and from a safety perspective during use, it is desirable to use a high boiling point heat wave liquid that operates on the negative pressure side.
Furthermore, recently there has been a demand for longer heaters due to higher speeds of false twisting machines, etc., and there has been a strong demand for improvement of poor temperature distribution in heaters.

The present invention has been proposed in view of the above points, and provides a closed type vapor phase heating type heat medium heater in which a heat transfer liquid is sealed in a closed container having a steam path and a heating element is provided. The upper part of the steam passage communicates with the exhaust gas pipe connected to the exhaust gas device, and is installed at the communication part between the exhaust gas pipe and the upper part of the steam passage, and opens and closes in response to commands from a detection device that detects the temperature around the communication part. A valve is provided in the exhaust gas pipe, and its purpose is to prevent poor temperature distribution due to accumulation of low boiling point gases, and to simplify the manufacturing process of closed containers. The point is that it provides a vapor phase heating type heat medium heater.

Since the present invention is configured as described above, the low boiling point gas accumulated in the closed container is collected by the steam flow at the upper part of the steam path which is the end point of the steam path, and the above-mentioned exhaust gas pipe is connected to the upper part of the steam path. Because the low-boiling point gas is connected, the low-boiling point gas does not remain in the steam line that serves as the heater function section, but is all concentrated in the exhaust gas line, and steam continues until the accumulated amount of low-boiling point gas exceeds the internal volume of the exhaust gas line. No more staying on the road.

When the accumulated amount of low boiling point gas exceeds the internal volume of the exhaust gas pipe, the low boiling point gas overflows from the communication part with the steam line, causing the temperature of the surrounding area to drop, and when this temperature drops to a predetermined value, The detection device detects this, a valve provided in the exhaust gas pipe is opened, and the low boiling point gas accumulated in the exhaust gas pipe is discharged to the outside by the waste removal device.

When the low boiling point gas in the exhaust gas pipe is discharged, the heat medium vapor reaches the area around the communicating part with the steam line, and the temperature of the surrounding area rises, so the valve detects this temperature and closes.

By repeating the above operations, the low boiling point gas accumulated in the closed container can be automatically discharged to the outside without stopping the machine even during operation.

Therefore, it is possible to save labor in operating and maintaining the machine, and also to prevent the occurrence of poor temperature distribution due to the accumulation of low boiling point gases, thereby improving the quality of the product.

In addition, conventional airtight containers were manufactured using a vacuum engineering product process by skilled workers to prevent minute leaks, but even if they are not manufactured using such a strict manufacturing process, low boiling point gases can be reliably removed from the outside. Since it is possible to prevent the occurrence of poor temperature distribution by discharging the heat to the outside, the manufacturing process can be significantly simplified.

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

10 is constructed by sealing a heat transfer liquid 13 in an airtight container 11 having a plurality of steam paths 12, and providing a heating element 14 whose power is controlled ON-OFF by detecting the temperature or pressure inside the airtight container. It is a closed type vapor phase heating type heat medium heater, and exhaust gas pipes 15 are connected to a closed container 11 and communicated with the upper part of a steam path 12, respectively.

The exhaust gas pipe 15 is provided with a heat medium separator 16 and a valve 18 in the middle thereof, and is connected to an exhaust gas device 21 to be described later.

The heat medium separator 16 connects the closed container 11 with a pipe 17 in order to separate the heat medium liquid contained in the exhaust gas and return it to the closed container 11.
The valve 18 detects the temperature of the core by a detection element 19 attached to the connection between the upper part of the steam path 12 and the exhaust gas pipe 15, and compares this detected temperature with a predetermined temperature. The valve 18 is opened when the temperature is below a predetermined temperature via the valve controller 20 that determines the valve 18
is automatically controlled to open and close.

The exhaust gas device 21 is composed of an exhaust gas pipe 22, an exhaust pump 23, a heat medium trap 24, and a pressure detector 25, and the exhaust gas pipe 15 is an exhaust gas pipe.

22, and the exhaust pump 23 is driven when the detection element 19 detects a predetermined temperature.

Further, the pressure detector 25 detects the pressure inside the exhaust gas pipe 22, and when the pressure inside the exhaust gas pipe 22 has decreased sufficiently, it sends a signal to the valve controller 20, and upon receiving this signal, the valve is controlled. device 20 is adapted to open valve 18.

Note that the heat medium trap 24 is for preventing heat medium vapor from scattering into the atmosphere.

Since this embodiment is configured as described above, the airtight container 1
The heating medium liquid 13 sealed in the container 1 is heated by the heating body 14 and evaporated, becomes heating medium vapor with a saturated vapor pressure relative to the set temperature, fills the closed container 11, and condenses in response to an external heat load. Then, latent heat is applied through the closed container 11.

When the heat medium vapor decreases, the heating element 14 detects the temperature or pressure inside the closed container 11 and is controlled to turn ON/OFF, so that the vapor pressure inside the closed container 11 is always maintained at a constant pressure, that is, at a constant temperature. It has become.

On the other hand, the low boiling point gas accumulated in the closed container 11 is guided to the upper part of each steam path 12 by the vapor flow of heat medium vapor, and an exhaust gas pipe 15 communicating with one part of the steam path 12 is connected. The end point of the steam flow is the exhaust gas pipe 15,
The low boiling point gas is collected in the exhaust gas pipe 15.

When the amount of low-boiling gas accumulated exceeds the volume of the exhaust gas pipe 15, it overflows from the exhaust gas pipe 15 to the upper part of the steam path 12 through the communication section, and the temperature of the core is lowered by the low-boiling gas. Ru.

When this temperature reaches a predetermined value, the detection element 19 detects this, and the valve controller 20 determines that the temperature is below the predetermined value, and the exhaust pump 23 is driven to reduce the pressure in the exhaust gas pipe 22.

When the pressure inside the exhaust gas pipe 22 drops sufficiently, the pressure detector 2
5 acts, a signal is sent to the valve control device 20, the valve 18 is opened, and the low boiling point gas in the exhaust gas pipe 15 is discharged to the outside from the exhaust gas pipe 22.

When the low boiling point gas is discharged as described above, the heating medium vapor reaches the communication part of the exhaust gas pipe 15 with the steam path 12, and the temperature of the core part rises, and when it exceeds a predetermined value, the opposite effect to the above occurs. The valve 18 closes, the discharge of the low boiling point gas is completed, and when the low boiling point gas accumulates again, the same action as described above is repeated, and even when a machine such as a false twister is in operation, the low boiling point gas is automatically removed without stopping. Gas can be discharged to the outside.

Therefore, it is possible to obtain a high-quality heat medium heater that saves labor in operating and maintaining the machine and does not cause poor temperature distribution.
The quality of processed synthetic fibers can also be stabilized.

In addition, in the manufacturing process of sealed containers, there is no need to go through the strict vacuum engineering process unlike conventional ones, and the manufacturing process can be significantly simplified and productivity can be improved, among other benefits. It is something.

In the above embodiment, one heat medium heater 10 was explained, but a plurality of heat medium heaters 10 may be used and these may be connected to the exhaust gas device 21 in the same manner as in the above embodiment. As shown in FIGS. 4, 5, 6, and 7, gas reservoirs 26 and 27 communicating with the upper part of the steam path 12 are also provided, and the gas reservoirs 26 and 21 are provided with the same structure as in the above embodiment. The exhaust gas pipe 15 and the exhaust gas device may be connected in the same manner, and as shown in FIGS. 8 to 10, a partition plate 28 may be provided in the steam path 12 to accumulate low boiling point gas. A space 29 is formed, and two temperature detection elements 30 with different set values are installed in this space 29 as shown in the figure.
．． 31, when the low boiling point gas becomes excessive, the detection element 30 detects it, activates the valve controller 32, opens the valve 33, and discharges the low boiling point gas in the same manner as in the above embodiment. When there is a shortage, it is detected by the detection element 31 and the valve controller 32 is actuated to open the valve 33 and inject the low boiling point gas, thereby constantly retaining the low boiling point gas in the space 29 and using it as a heat insulating layer. It can also be used effectively.

[Brief explanation of drawings]

Figure 1 is a partially cutaway schematic front view showing the conventional one;
The figure is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a partially cutaway schematic front view showing one embodiment of the present invention, and FIG. 4 is a partially cutaway schematic front view showing another embodiment of the present invention. , Figure 5 is B-B in Figure 4.
6 is a partially broken schematic front view showing still another embodiment of the present invention, FIG. 7 is a sectional view taken along the line CC in FIG. 6, and FIG. 8 is a still another embodiment of the present invention. FIG. 9 is a partially broken schematic front view showing an example, FIG. 9 is a sectional view taken along line DD in FIG. 8, and FIG. 10 is a sectional view taken along line EE in FIG. 8. 10: Heat medium heater, 11: Sealed container, 12: Steam path, 1
3: Heat medium liquid, 14: Heating body, 15: Exhaust gas pipe, 18: Valve, 19: Detection element, 21: Exhaust gas device.

Claims (1)

[Claims] 1. In a closed type vapor phase heating type heat medium heater, which is formed by enclosing a heat medium liquid in a closed container having a steam path and providing a heating element, the upper part of the steam path of the closed container is connected to an exhaust gas pipe connected to an exhaust gas device. A valve is provided in the exhaust gas pipe, which is attached to the communicating part between the exhaust gas pipe and the upper part of the steam passage along with the communication slide, and opens and closes in response to a command from a detection device that detects the temperature around the communicating part. Heat medium heater.