JPH0989375A - Package boiler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a water replenishing device to replenish water and an expansion tank to absorb a rise in the pressure of hot water by heating of a hot water boiler easily near a specified heat harnessing part by arranging the device and the tank beforehand for communication with a passage between the hot water boiler and a circulation pump. SOLUTION: When the pressure of hot water rises in a hot water circulation system, the pressure equivalent to the rise thereof is absorbed by an expansion tank 36 from the suction side of a circulation pump 22 of a hot water lead out device 18. By the contrary, when the pressure of the hot water lowers, a regulator 30 of a water replenishing device 19 is actuated to fill replenishing water to the suction side of the circulation pump 22 of the hot water lead out device 18. In short, this eliminates the need for controlling the operation of the hot water boiler 21 and the circulation pump 22 to match a load and simplifies the structure of the hot water boiler 21, the circulation pump 22 and the like. This allows assembling work easily at a factory or the like thereby shortening the terms of installation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package boiler that circulates hot water serving as a heat source in a predetermined heat utilization section.

[0002]

2. Description of the Related Art From the viewpoint of ensuring traffic safety and convenience of daily life, snow removal on roads is an essential item in areas with a large amount of snowfall. Therefore, recently, it has been proposed to lay a heat pipe having a high heat transport capacity and a high temperature uniformity under the road surface to perform low-cost and labor-saving road snow melting.

An example of this road snow melting device is shown in FIG. 2 and will be briefly described. The snow melting device 1 is configured to embed a header pipe 3 in which a plurality of U-shaped header pipes 2 are continuously arranged at equal intervals along a shoulder portion of a road, and to supply hot water to the header pipe 3. Then, the evaporation portion 5a of the heat pipe 5 is inserted into each U-shaped header tube 2 while maintaining an airtight state. In addition, the condensing part 5b of each heat pipe 5 is buried so as to incline so as to be higher than the evaporating part 5a and below the road surface of the road part.

According to the road snow melting device 1 configured as described above, the header pipe 2 can be used when snow falls or when there is snow on the road surface.
When hot water is circulated through the header pipe 3 and the header pipe 3, the evaporation portions 5a of the heat pipes 5 inserted in the U-shaped header pipe 2 are respectively heated, the working fluid enclosed is evaporated, and the vapor is condensed into the condensation portion 5b. Move to. Then, in the condensing section 5b, the vapor of the working fluid releases latent heat of vaporization and condenses, and the working fluid that has returned to the liquid phase recirculates back to the evaporating section 5a. At this time, the heat released from the condensing portion 5b buried in the roadway portion prevents the roadway portion from melting snow and freezing.

[0005]

As a system for supplying hot water as a heat source to the road snow melting device 1 as described above, a header pipe 2 and a header pipe 3 of the road snow melting device 1 are used by using a hot water boiler, a circulation pump or the like. In some cases, a system configured to circulate heated hot water may be used. When such a hot water boiler system is used, since the scale of the target road snow melting device 1 is diverse, and there are almost no identical structures, arrangements, fluctuations in heat load, etc. First, an installation location or a container is created by building in a pit or the like near the location, and necessary equipment such as a hot water boiler and a circulation pump is installed and connected here.

That is, in the conventional structure, since the installation or the assembling work must be performed after the installation place or the container is built on the site, not only the workability is bad, but also the installation construction period is prolonged and the installation is performed. There was an inconvenience such as high cost.

On the other hand, even if the system has a capacity capable of withstanding fluctuations in heat load, it is usually constructed so that the temperature of the hot water does not drop below the temperature at which snow cannot melt.
The hot water temperature may drop below the temperature suitable for operation,
In such a case, the efficiency of the hot water boiler is reduced and the heat transfer surface of the hot water boiler may be corroded.

In the hot water boiler system in which the installation / accommodation site is constructed first, as the target is equipment such as the above-mentioned snow melting device whose scale / structure varies according to the installation site. As a general rule, so-called on-site work occupies most of the work, which makes it difficult to perform work, and there is an inconvenience in the future such as a longer construction period and higher costs.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a package boiler which can be easily installed in the vicinity of a predetermined heat utilization portion.

[0010]

In order to achieve the above-mentioned object, the invention described in claim 1 is a package boiler for supplying hot water to a predetermined heat utilization part in a circulating manner. A hot water introducing section connectable to one end of the heat utilizing section, a hot water outlet section connectable to the other end of the heat utilizing section, and a makeup water introducing section connectable to a predetermined makeup water source, Inside a portable housing provided with a fuel introduction part connectable to a predetermined fuel source, a handling part engageable with a predetermined conveying member, and a fixing part fixable to a predetermined base member. A hot water boiler that heats the hot water that recirculates from the heat utilization unit through the hot water introduction unit using the fuel that is introduced through the fuel introduction unit, and pressurizes the hot water heated by the hot water boiler. Derives to the heat utilization unit via the hot water derivation unit Together with ring pump is disposed,
A makeup water device for replenishing makeup water introduced through the makeup water introducing unit, and an expansion tank for absorbing a rise in pressure of the warm water due to heating of the warm water boiler, a flow between the warm water boiler and the circulation pump. It is characterized in that it is arranged so as to communicate with the road.

According to a second aspect of the present invention, a bypass flow passage capable of adjusting the flow rate of the hot water flowing therethrough is a flow passage for returning the hot water from the heat utilization portion to the hot water boiler via the hot water introducing portion. The hot water boiler and the circulation pump are provided so as to communicate with the flow path, and an operating temperature detecting means for detecting an operating temperature of the hot water boiler, and a signal from the operating temperature detecting means. A control means for controlling the flow rate of the hot water flowing through the bypass passage is provided.

Further, in the invention described in claim 3, the makeup water device stores a makeup water tank for storing makeup water introduced through the makeup water introducing portion, and the makeup water tank is stored in the makeup water tank. A pressure pump that pressurizes the makeup water to a predetermined pressure, and a difference between the pressure of the makeup water pressurized by the pressure pump and the pressure of the hot water flowing through the flow path between the hot water boiler and the circulation pump. A regulator that adjusts the amount of makeup water that circulates in accordance with the configuration, and the makeup water device is configured to communicate with the expansion tank through a throttle valve to a flow path between the hot water boiler and the circulation pump. It is characterized by being.

According to the package boiler of the first aspect, hot water is provided in a predetermined facility such as a factory in a housing provided with a handling portion and a fixing portion so as to facilitate transportation and installation. Since the work of assembling the boiler, the circulation pump, the makeup water device, and the like can be performed, the amount of work at the installation site is reduced.

According to the package boiler of the second aspect, the bypass flow passage for reducing the amount of hot water flowing through the hot water boiler is provided. This bypass flow path communicates when the operating temperature of the hot water boiler becomes equal to or lower than a predetermined temperature, and limits the amount of hot water that flows back from the heat utilization unit to the hot water boiler, so that the operating temperature of the hot water boiler decreases. To be prevented. Therefore, it is possible to prevent the operation efficiency of the hot water boiler from being lowered and the occurrence of corrosion and the progress of corrosion in the hot water boiler due to the decrease in the operating temperature of the hot water boiler. At this time, the load of the circulation pump, specifically, the amount of hot water pressurized by the circulation pump does not change.

Further, according to the package boiler of the third aspect, a hot water circulating system including a hot water boiler, a circulation pump, a heat utilization unit, and the like, and a hot water circulating system and the hot water circulating system. An expansion tank that absorbs a rise in the pressure of the hot water flowing through is connected to a pipe between the hot water boiler and the circulation pump so as to communicate with the pipe via a throttle valve.

Therefore, immediately after the package boiler is activated, the pressure on the suction side of the circulation pump temporarily decreases, and in response to the decrease in the pressure, the regulator tries to replenish the hot water circulation system (circulation pump) with makeup water. However, the throttle valve reduces the supply amount of makeup water. In other words, replenishment water is not replenished excessively to the hot water circulation system until the temporary decrease in pressure on the suction side of the circulation pump is resolved. Therefore, when the hot water constantly starts to circulate in the hot water circulation system, the pressure of the hot water does not suddenly increase in the hot water circulation system, and the damage of the hot water circulation system is prevented.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to FIG. The example shown here is a package boiler that supplies hot water to the snow melting section (heat utilization section) 10 that is buried under the road so as to circulate so as to prevent snow melting on the road or freezing of the road. In addition, this snow melting part 10
It is a heat pipe type snow melting apparatus explained in the prior art.

In FIG. 1, this package boiler is provided with a casing 11 serving as an outer shell, and this casing 11 is provided with a handling portion 12 and a fixing portion 13 so that it can be conveyed by an appropriate conveying means. It is easily fixed to an appropriate base portion provided in the vicinity of the snow melting portion.

In addition, in the case 11, a hot water outlet portion 14 connectable to the inlet pipe 10a of the snow melting portion 10 and the snow melting portion 1 are provided.
There is provided a hot water introducing part 15 connectable to the 0 outlet pipe 10b, a make-up water introducing part 16 connectable to a predetermined make-up water source, and a fuel introducing part 17 connectable to a predetermined fuel source.

Further, inside the housing 11, a hot water outlet 18 for heating the hot water flowing back from the snow melting portion 10 to lead it to the snow melting portion 10, and a makeup water 18 for supplying makeup water to the hot water outlet 18. A replenishing water device 19 for replenishing the water and a controller 20 for controlling the operations of the hot water deriving device 18 and the replenishing water device 19 are assembled.

The hot water discharge device 18 heats the hot water flowing back from the snow melting section 10 by the combustion heat of the fuel introduced through the fuel introducing section 17, and the hot water boiler 21.
The circulating pump 22 pressurizes the warm water heated by the above and draws it out to the snow melting section 10.

That is, in the hot water introducing part 15, a pipe 23 communicating with the outlet pipe 10b of the snow melting part 10 is connected to the hot water boiler 21, a pipe 24 is connected between the hot water boiler 21 and the circulation pump 22, and a hot water outlet part. At 14, a pipe 25 communicating with the inlet pipe 10 a of the snow melting section 10 is connected to the discharge side of the circulation pump 22. That is, by the communication of the hot water boiler 21, the circulation pump 22, and the snow melting section 10,
A hot water circulation system is formed.

A bypass pipe 26 is arranged so that the pipe 23 between the snow melting section 10 and the hot water boiler 21 and the pipe 24 between the hot water boiler 21 and the circulation pump 22 communicate with each other. In other words, the bypass pipe 26 for the hot water boiler 21 is provided. The electric three-way valve 2 is provided at the connecting portion between the bypass pipe 26 and the pipe 24.
7 are provided.

This electric three-way valve 27 is used in the controller 2
A signal from 0 is configured to simultaneously adjust the flow rate of hot water flowing through the hot water boiler 21 and the flow rate of hot water flowing through the bypass pipe 26. Specifically, by distributing a part of the hot water flowing back to the hot water boiler 21 to the bypass pipe 26, the flow rate of the hot water flowing through the hot water boiler 21 is adjusted while keeping the flow rate of the hot water flowing through the circulation pump 22 constant. It is like this.

The make-up water device 19 includes a make-up water tank 28 for storing make-up water introduced from the outside of the housing 11 through the make-up water introducing portion 16, and a make-up water tank 28 for making up the make-up water. A pressurizing pump 29 that pressurizes the pressure to a predetermined pressure, specifically, a steady pressure of hot water flowing through the hot water circulation system,
When the pressure of the makeup water pressurized by the pressure pump 29 is higher than the pressure of the warm water in the warm water circulation system, the regulator 30 is provided to supplement the makeup water to the warm water circulation system according to the difference.

That is, a pipe 31 communicating with a makeup water source via the makeup water introducing portion 16 is connected to the makeup water tank 28, and a pipe 32 is provided between the makeup water tank 28 and the pressurizing pump 29.
Is connected, a pipe 33 is connected between the pressurizing pump 28 and the regulator 29, and a pipe 34 is connected so as to communicate with the pipe 24 of the hot water outlet 18 from the regulator 30. The pipe 31 of the makeup water device 19 is provided with a shutoff means 37 such as a check valve so that the operation of the pressurizing pump 29 is not hindered.

Then, in the pipe 34 of the makeup water device 19,
A throttle valve 35 is provided, and an expansion tank 36 that absorbs an increase in the pressure of hot water in the hot water circulation system due to heating of the hot water boiler 21 is connected via a pipe 37 so as to communicate with each other. In other words, the makeup water device 19 and the expansion tank 36 share the throttle valve 35 and are connected to the pipe 24 of the hot water outlet device 18.

On the other hand, the controller 20 includes a weather sensor 38 such as a snowfall sensor or an air temperature sensor arranged on the outer wall surface of the housing 11, a road surface temperature sensor or a moisture sensor arranged on the road surface. Based on the signal of the situation sensor 39,
The hot water boiler 21 of the hot water outlet device 18 and the circulation pump 22 and the pressurizing pump 29 of the makeup water device 19 are configured to be started or stopped.

Further, the controller 20 receives a signal from the can body temperature sensor 40 for detecting the operating temperature of the hot water boiler 21, and based on this signal, the operation of the electric three-way valve 27 of the hot water outlet device 18. Is configured to control.

That is, the controller 20 is based on the data obtained from the various sensors 38 and 39, the hot water boiler 21, the circulation pump 22 and the pressurizing pump 2.
The amount of hot water flowing through the bypass pipe 26 and the hot water flowing through the hot water boiler 21 based on the first control means for controlling the start / stop of 9 and the operating temperature of the hot water boiler 21 obtained from the can body temperature sensor 40. And second control means for adjusting.

Next, the operation of the package boiler having the above structure will be described. When the controller 20 activates the hot water boiler 21, the circulation pump 22, and the pressurizing pump 28 of the makeup water device 19 of the hot water deriving device 18 by the signals of the various sensors 38 and 39, and these are operated steadily, Hot water circulates in the snow melting section 10 buried in the. The heat exchange between the circulating hot water and the road surface through the snow melting portion 10 prevents snow melting on the road surface or freezes on the road surface.

During the steady operation of the package boiler, for example, a large amount of snow is melted in the snow melting section 10, and the temperature of the hot water flowing back to the hot water boiler 21 is lowered.
When the temperature of the can body 1 is lower than 70 ° C., for example, the electric three-way valve 27 causes the bypass pipe 26 to circulate the hot water heat-exchanged in the snow-melting section to reduce the amount of the hot water flowing in the hot water boiler 21. . Therefore, the heat load of the hot water boiler 21 does not increase more than a predetermined value.

Therefore, the operating temperature of the hot water boiler 21 does not drop below the preset temperature. for that reason,
There is no adverse effect due to a decrease in the operating temperature of the hot water boiler 21, specifically, deterioration of the operating efficiency of the hot water boiler 21 and corrosion of the hot water boiler 21 due to the adherence of sulfur or the like contained in the fuel.

On the other hand, when the pressure of the hot water rises in the hot water circulation system, the pipe 24 between the hot water boiler 21 and the circulation pump 22, that is, the circulation pump 22 of the hot water outlet device 18.
The pressure that has risen from the suction side to the expansion tank 36 is absorbed. On the contrary, when the pressure of the hot water in the hot water circulation system drops, that is, when the hot water leaks in the hot water circulation system, the regulator 30 of the makeup water device 19 operates and the suction side of the circulation pump 22 of the hot water outlet device 18 is reached. Add make-up water. Therefore, the circulation pump 22 constantly pressurizes a substantially constant amount of warm water.

That is, the thermal load of the hot water boiler 21 and the load of the circulation pump 22 do not fluctuate while preventing the operating temperature of the hot water boiler 21 from decreasing.
Hot water boiler 21 and circulation pump 22 according to load
There is no need to control the operation of. Therefore, the structure of the hot water boiler 21 and the circulation pump 22 can be simplified, and the package boiler can be downsized.

Immediately after starting the package boiler,
The pressure on the suction side of the circulation pump 22 temporarily drops,
The regulator 30 tries to supply makeup water to the hot water circulation system in response to the decrease in pressure.
And a throttle valve 35 arranged in a pipe 34 between the hot water circulation system
As a result, the amount of makeup water can be suppressed. In other words,
The throttle valve 35 slows down the speed of supply of makeup water by the regulator 30. Therefore, makeup water is not excessively introduced into the warm water circulation system until the warm water circulation system shifts to steady operation.

Therefore, when the warm water circulation system shifts to steady operation, the pressure inside the warm water circulation system does not rise sharply. That is, a strong pressure does not act on each part of the hot water circulation system. Therefore, it is possible to reduce the size of each part while preventing damage to each part of the hot water circulation system.

As described above, even in the case of a package boiler configured to circulate hot water as needed in the heat utilization part where the heat load fluctuates like snow melting on the road, the operating efficiency of the hot water boiler is high. It is possible to achieve downsizing while preventing a decrease in temperature and damage to the hot water circulation system. Therefore, the assembly work can be easily performed in a factory or the like, so the work at the installation site is reduced and the installation period of this package boiler is shortened. Further, since the installation space of this package boiler is reduced, the area where it can be installed is increased.

In this embodiment, the electric three-way valve 27 is arranged at the connecting portion between the pipe 24 between the hot water boiler 21 and the circulation pump 22, the bypass pipe 26, and the bypass pipe 26 and the hot water boiler 21. By arranging an automatic valve upstream or downstream, the amount of hot water introduced into the circulation pump 22 can be changed from the snow melting section 10 to the hot water boiler 2
It is also possible to adjust the amount of hot water refluxed to 1.

[0040]

As described above, according to the invention described in claim 1, since the hot water boiler, the circulation pump, the makeup water system and the like can be assembled in a predetermined facility such as a factory, The amount of work at the installation site is reduced and the installation period is shortened.

Further, according to the invention described in claim 2, since the bypass flow passage is arranged so that the flow rate of the hot water flowing therethrough can be adjusted based on the operating temperature of the hot water boiler, the hot water boiler is provided. Heat load does not increase. for that reason,
Even with a hot water boiler having a simple structure, a decrease in operating temperature is prevented, and deterioration in operating efficiency of the hot water boiler and corrosion of the hot water boiler due to the decrease in operating temperature are prevented.

Further, according to the invention described in claim 3, since the makeup water system for supplementing the makeup water is connected to the suction side of the circulation pump via the throttle valve, the pressure of the suction side of the circulation pump is reduced. Until the temporary drop is resolved, the supply of make-up water to the hot water circulation system is not excessively supplied. Therefore, even if this package boiler is repeatedly started and stopped, the pressure of the hot water circulating inside does not rise sharply, and damage to the package boiler is prevented.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an example of a hot water circulation type snow melting device having a heat utilization unit in which a heat load varies.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Snow melting part, 11 ... Housing, 12 ... Handling part, 13 ... Fixing part, 14 ... Hot water derivation part, 1
5 ... Warm water introduction part, 16 ... Make-up water introduction part, 17 ... Fuel introduction part, 18 ... Hot water derivation device, 19 ... Make-up water device,
20 ... Controller, 21 ... Hot water boiler, 22 ...
Circulation pump, 26 ... Bypass piping, 27 ... Electric three-way valve, 28 ... Make-up water tank, 29 ... Pressurizing pump, 3
0 ... Regulator, 35 ... Throttle valve, 36 ... Expansion tank.

Front page continuation (72) Inventor Koichi Masuko 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Yoshihiro Ishida 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Ltd.

Claims (3)

[Claims] 1. A package boiler for supplying hot water to a predetermined heat utilization unit so as to circulate the hot water, wherein the hot water introduction unit is connectable to one end of the heat utilization unit,
A hot water outlet connectable to the other end of the heat utilization unit,
Make-up water introducing part connectable to a predetermined make-up water source, fuel introducing part connectable to a predetermined fuel source, handling part engageable with a predetermined conveying member, and fixing fixable to a predetermined base member A hot water boiler that heats hot water flowing back from the heat utilization unit via the hot water introduction unit using a fuel introduced via the fuel introduction unit inside a portable housing having a heating portion. And a circulation pump that pressurizes the hot water heated by the hot water boiler and guides it to the heat utilization unit via the hot water outlet, and replenishment introduced via the makeup water inlet. A make-up water device for replenishing water and an expansion tank for absorbing a rise in pressure of hot water due to heating of the hot water boiler are arranged so as to communicate with a flow path between the hot water boiler and the circulation pump. Characteristic package boiler. 2. A bypass flow path capable of adjusting the flow rate of hot water flowing therethrough, between the flow path for returning to the hot water boiler from the heat utilization section through the hot water introduction section, and between the hot water boiler and the circulation pump. And a flow rate of hot water flowing through the bypass flow path based on a signal from the operating temperature detecting means for detecting the operating temperature of the hot water boiler and the hot water boiler. The package boiler according to claim 1, further comprising: a control unit that controls the package boiler. 3. The makeup water device stores a makeup water tank for storing makeup water introduced through the makeup water introducing section, and a pressurizing water tank for supplementing the makeup water stored in the makeup water tank to a predetermined pressure. The pressure pump, the amount of makeup water that flows according to the difference between the pressure of the makeup water pressurized by this pressure pump and the pressure of the warm water that flows through the flow path between the hot water boiler and the circulation pump. A regulator for adjusting, and the makeup water device is configured to communicate with the expansion tank through a throttle valve to a flow path between the hot water boiler and the circulation pump. 1. The package boiler according to 1.