JP2536487B2 - Hot water circulation device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hot water circulation device that uses vapor pressure to supply hot water heated by a burner to a radiator without using a circulation pump.

[Conventional technology]

Conventionally, as a structure for circulating hot water heated by a kettle in a radiator, there is a structure that uses a vapor pressure that can be used even in a place where power is not supplied, instead of a circulation pump.

That is, JP-A-52-141044 and JP-B-57-53929,
Japanese Patent Application Laid-Open No. 57-23731, which is proposed by the applicant, discloses a circulation pipe that heats a kettle forming a water storage can that can be sealed with a burner, and connects the kettle with a radiator by the vapor pressure generated in the kettle. The hot water of the boiling water can be pumped to the radiator, and the circulation pipe that connects the radiator and the open tank directly opens to the open tank, and the hot water pumped from the boiling water can go to a higher position than the boiling water via the radiator. There is described a structure in which water that is extruded into an open tank and stored in the open tank is returned to a kettle via an on-off valve.

As a well-known valve structure for returning the water in the open tank to the kettle, the conventional structure of Japanese Utility Model Publication No. 57-53929 and Japanese Unexamined Patent Publication No. 57-237 are known.
No. 31 disclosed a check valve, and it was common to use a check valve.

On the other hand, the biggest problem with this type of hot water circulation system is that stable operation is difficult to obtain.When using the conventionally known check valve, if the calorific value of the burner is increased, the water in the open tank will be slightly When it entered, it boiled instantly to generate a large amount of steam, and this steam pressure closed the check valve, resulting in the worst state of being unable to circulate. And, the one that obtains stable hot water circulation with the check valve is
The calorific value of the burner needs to be smaller than the capacity of the kettle, the interval for pumping the circulating water is long, and the circulating water amount is extremely small.

Therefore, in Japanese Utility Model Publication No. 57-53929, a proposal has been made to replace this check valve with a solenoid valve controlled by a liquid level switch. Similarly, in Japanese Patent Laid-Open No. 52-141044, under the control of a liquid level switch. Disclosed is a proposal to use a solenoid valve (solenoid-driven on-off valve). If the liquid level switch signal opens the on-off valve while hot water still remains in the water heater, high-pressure steam will be released through the open tank. Although it escaped to, it was found that the water in the open tank surely flows into the kettle, which enables stable hot water circulation.

Also, as a structure that uses a check valve for the on-off valve, an open pipe that connects the closed water can and the upper space of the open tank is provided,
By attaching a pressure relief valve that operates with the signal of the liquid level switch that switches when hot water still remains in the kettle to the open pipe, steam will surely escape from the kettle, so even if a check valve is used, air lock will occur. The water in the open tank can now flow into the kettle.

[Problems to be Solved by the Invention] By the way, in a hot water circulation system that does not use a circulation pump, in order to avoid the worst possible inability to circulate, it is necessary to pour water into an open tank while hot water still remains in the water heater. In all of the above-mentioned conventional examples, the valve is opened directly or indirectly by detecting the liquid level.

Although these systems were able to avoid the worst case of inability to circulate, in this system, the amount of hot water sent to the radiator per cycle is the amount of water corresponding to the difference between the high level and the low level of the liquid level detector. It is smaller than the size of the kettle, and when the water stored in the open tank is returned to the kettle, a large amount of vapor pressure escapes from the kettle, so the number of pumping cycles and the flow rate within a fixed time are increased. It was difficult.

The open tank where hot water is returned from the radiator functions as a storage tank, and is partly preheated by the heat in the exhaust gas. Since the main heating part of is only the kettle, and the low-temperature water that has radiated and cooled is sent to the kettle, it was unavoidable that it took a long time to start the pumping of hot water.

[Means for solving the problem]

The present invention improves the operating efficiency by increasing the amount of circulating water per unit time, and is an open tank 1 that communicates with the atmosphere.
And a water heating can 2 which is provided at a position lower than the open tank 1 and forms a sealable water storage canister, and a radiator 3 to which the hot water of the water heating can 2 is supplied, and the open tank 1, the water heating can 2 and the heat radiator 3 are provided.
-The open tank 1 is communicated with the circulation pipe 4, the circulation pipe 4 forms a water circulation path, and the circulation pipe 4
An opening / closing valve 5 is attached to a circulation pipe 4 ′ in a portion of the open tank 1 which communicates with the kettle 2, and when the opening / closing valve 5 is opened, the water in the open tank 1 at a high position flows into the kettle 2 and the opening / closing valve 5
The hot water is pumped to the open tank 1 via the radiator 3 by the vapor pressure generated in the kettle 2 when the circuit is closed, and the open / close valve 5 that repeats opening and closing is used for the circulation device in which the hot water flows in the circulation pipe 4 that forms the circulation path by the intermittent operation. At this time, the kettle 2 is installed in the combustion gas passage of the burner 7, and the open tank 1 is the kettle 2
It is composed of a cylindrical lower tank 6 formed on the outer periphery of the water tank, and an upper tank 6 ′ which is located above the water kettle 2 and which forms a water tank communicating with the lower tank 6. Circulation pipe 4 ″ located at the outlet side of the radiator 3
Is connected to the bottom of the lower tank 6.

Further, the upper part of the lower tank 6 provided on the outer periphery of the kettle 2 constituting the open tank 1 is continuously formed with the lower part of the upper tank 6'provided above the kettle 2 to form an integrated open tank 1. By heating with the burner 7 together with the kettle 2,
The temperature of the water in the open tank 1 flowing into the kettle 2 is raised quickly.

[Action]

According to the present invention, when the water flows into the kettle 2 from the open tank 1, the steam escapes to the open tank 1,
By increasing the cycle of pumping hot water from the kettle 2 to the radiator 3, the amount of circulating water is increased to improve the operation efficiency. Specifically, the kettle 2 is installed in the combustion gas passage of the burner 7. The open tank 1 is composed of a lower tank 6 formed on the outer circumference of the kettle 2 with a passage space for combustion gas, and an upper tank 6'forming a water tank above the kettle 2. Then, the circulation pipe 4 ″ located at the portion of the circulation pipe 4 on the outlet side of the radiator 3
Since the hot water radiated and cooled by the radiator 3 is connected to the lower tank 6 and is diffused to the upper tank 6 ′ while being heated by the lower tank 6, the hot water temperature in the open tank 1 can be kept high. Is.

Therefore, the temperature of the water flowing from the open tank 1 into the kettle 2 becomes high, and the high-temperature water flowing into the kettle 2 is immediately sent to the radiator 3, so that the pressure feeding cycle becomes very fast.

〔Example〕

Referring to the drawings showing an embodiment of the present invention, 1 is an open tank that communicates with the atmosphere, 2 is a boiling water tank that forms a water storage canister that can be sealed at a position lower than the opening tank 1, and 3 is a boiling water tank 2. The radiator is a radiator to which hot water is supplied, and the open tank 1, the kettle 2, the radiator 3, and the open tank 1 are connected by a circulation pipe 4 to form a circulation path.

Reference numeral 5 denotes an on-off valve attached to a circulation pipe 4'which connects the open tank 1 and the water kettle 2 in the circulation pipe 4. The open-close valve 5 is opened before use, and when the open tank 1 is filled with water, the open-close valve 5 is opened. Water flows into the kettle 2, the radiator 3 and the circulation pipe 4 via the water, and stops pouring water when a small amount of water is stored in the open tank 1.

Reference numeral 7 is a burner for heating the kettle 2. When the burner 7 is ignited with the on-off valve 5 closed, the kettle 2 is heated,
There is no escape route for the generated steam, and the vapor pressure is 2
The water surface of the radiator is pressurized to send hot water to the radiator 3,
The water cooled in step 1 is returned to the open tank 1.

In this way, when the hot water in the kettle 2 is sent to the radiator 3, the on-off valve 5 is opened by the signal from the liquid level switch and the water in the open tank 1 at the upper position flows into the kettle 2. Even if the volume of the upper space of the kettle 2 decreases due to the rise in the water level of the kettle 2, the upper space of the kettle 2 is almost completely filled with water vapor, so the space volume becomes smaller as the condensation of water vapor advances. 2 can be replenished with water.

In addition, since the hot water is sent to the radiator 3 and the circulation pipe 4 forming the circulation path of the hot water, the flow path resistance of the circulation path passing through the radiator 3 is large, and the heat is radiated even if the internal pressure of the kettle 2 decreases. The water in the open tank 1 does not flow backward from the side of the container 3
Flows into.

10 is an on-off valve that opens due to a signal from the liquid level switch 5
This is a liquid level detector attached to the open tank 1 which outputs a closed circuit signal. When the liquid level detector 10 detects the full amount of the boiling water can 2 and the on-off valve 5 is closed, the boiling water can 2 is pressurized again. It At this time, instead of the liquid level detector 9, the timer may indirectly detect the time required for lowering the water level of the open tank 1, and once the on-off valve 5 is closed, the water tank can be reopened. The hot water 2 is sent to the radiator 3, and the open / close valve 5 is repeatedly opened and closed to form a circulating water cycle.

By the way, when the hot water of the kettle 2 is sent to the radiator 3 and the open / close valve 5 is opened, the water in the open tank 1 flows into the kettle 2, and this water causes steam to be generated by the hot kettle 2. The generated amount of this steam is related to the calorific value of the burner 7 and is small at a small calorific value, so the steam is cooled and condensed by the large amount of water flowing into the kettle 2 and the pressure rise of the kettle 2 is suppressed. Then, water can continue to flow from the open tank 1.

However, when the calorific value of the burner 7 is large, a large amount of steam is immediately generated when the water in the open tank 1 flows into the kettle 2, and even if a part of the steam can be condensed, the steam generation is large. The pressure rises rapidly, and hot water cannot be circulated because water cannot flow from the open tank 1.

For this reason, conventionally, when water still remains in the kettle 2, the liquid level switch detects a drop in the water level and opens the open / close valve 5, thereby releasing the high-pressure vapor pressure through the open tank 1. , Although it is less energy efficient,
The certainty of hot water circulation is obtained.

According to the present invention, the kinetic efficiency is improved by increasing the circulating amount of hot water, and the kettle 2 is installed in the combustion gas passage just above the burner 7. 6 is a kettle
A cylindrical lower tank installed on the outer periphery of the container with a passage of combustion gas, 6'is an upper tank located above the kettle and having a discharge tube for combustion gas in the center, and the open tank 1 is a lower part. It is composed of a tank 6 and an upper tank 6 '.

Reference numeral 8 denotes a connecting pipe for connecting the lower tank 6 and the upper tank 6'when they are formed as separate tanks, which connects the two tanks 6 and 6 '. Open tank 1 with one can continuously connecting the bottom of 6 '
Do not use when forming.

4 ″ is a circulation pipe 4 that forms a circulation path of hot water,
A circulation pipe which is located at the outlet side of the radiator 3 and connects the radiator 3 and the open tank 1 to each other.
Is connected to the bottom of the lower tank 6, and water after heat exchange is sent from the radiator 3 to the lower tank 1. Since the lower tank 6 is rapidly heated together with the kettle 2 by the combustion gas of the burner 7, the water that has undergone heat exchange in the radiator 3 becomes high temperature, and this high temperature water is sent to the upper tank 6'which forms a reservoir. Is.

Therefore, the temperature of the water stored in the open tank 1 rises as the liquid level in the upper tank 6'rises, and the temperature of the hot water sent to the kettle 2 increases when the on-off valve 5 is opened next time. Immediately produces a large amount of water vapor,
Hot water can be sent to the radiator 3.

4'is a circulation pipe 4 forming a circulation path of hot water,
An open / close valve 5 is attached to the circulation pipe 4 ′, which is a circulation pipe for communicating the upper tank 6 ′ forming the water storage chamber of the open tank 1 and the water kettle 2. When connecting the lower tank 6 and the upper tank 6'with the connecting pipe 8, there is a space between the kettle 2 located in the center of the lower tank 6 and the upper tank 6 ', and the circulation pipe 4'is attached. However, since the connection pipe 8 has a large flow resistance, the temperature rise of the upper tank 6'may be delayed.

Further, as shown in FIG. 2, when the upper tank 6'and the lower portion of the upper tank 6'are made continuous to form the open tank 1 with a single can body, the temperature rise of the upper tank 6'quickly occurs. However, since the water boiler 2 is located inside the lower tank 6, the work of attaching the circulation pipe 4'is difficult and complicated, and can be arbitrarily selected depending on the conditions of the equipment installed at the manufacturing establishment. It is possible.

Reference numeral 9 is a changeover switch for generating an open circuit signal of the open / close valve 5 attached to the hot water canister 2 or in the vicinity of the hot water canister 2 in order to supply the water in the open tank 1 to the hot water canister 2. As a concrete changeover switch 9, In the embodiment shown in FIG. 1, the circulation pipe 4
It is formed by a temperature switch 9'attached to a circulation pipe 4 located in a portion where the kettle 2 and the radiator 3 communicate with each other.
The open / close valve 5 is opened when the liquid temperature changes to the vapor temperature.

In the embodiment shown in FIG. 2, the changeover switch 9 is formed by a pressure switch 9 ″ attached to the kettle 2, and the open / close valve 5 is opened when the kettle 2 is lowered from the positive pressure to the atmospheric pressure. When the position detector 10 has a contact that switches at a high liquid level, the contact causes the contact to function as a changeover switch 9 to open and close the on-off valve 5.
May be opened.

Reference numeral 11 is an open pipe communicating the upper part of the kettle 2 with the upper part of the open tank 1, 12 is a pressure relief valve that works with the liquid level detector 10 attached to the open pipe 11, and 5'is an open / close valve 5 that works with the changeover switch 9. The check valve 5 ′ functions as a check valve, and the check valve 5 ′ is a burner 7.
When the calorific value of 1 is very small, it can be used alone instead of the on-off valve 5, but when the calorific value of the burner 7 is large, it cannot be used as it is.

Therefore, when the check valve 5'is used instead of the on-off valve 5 as in the embodiment shown in FIG. 1, when the pressure release valve 12 of the open pipe 11 is opened by the changeover switch 9, the pressure of the kettle 2 is released. Since it escapes to the atmospheric pressure, a pressure difference that pushes the check valve 5 ′ is created, and water can flow from the open tank 1 into the kettle 2. Since the pressure relief valve 12 mainly opens and closes the gas flow path, a small and inexpensive valve can be used, and the pressure relief valve 12 can also be inexpensively constructed in combination with the check valve 5 '.

〔The invention's effect〕

As described above, in the present invention, the water cooled by the radiator 3 is heated by the lower tank 6 that covers the outer circumference of the open tank 1 and the kettle 2 to become hot water.
Is always heated by the burner 7 to become high temperature water, so that the water cooled by the radiator 3 mixes with the high temperature water and immediately rises in temperature so that the water temperature in the open tank 1 can be maintained at a very high temperature. It has become.

Therefore, when the open / close valve 5 is opened, the water flowing into the kettle 2 is already at a high temperature. When the open / close valve 5 is closed, the kettle 2 immediately generates steam and hot water is sent to the radiator 3. It became so.

Further, since the surroundings of the kettle 2 is covered with the lower tank 6, there is no heat radiation, and the thermal energy given by the burner 7 mainly applies the hot water flowing from the open tank 1 to the radiator 3
It is used for the pump action to send to, and the time required for one cycle is very short, the amount of circulating water per constant time is increased, and the heating capacity is remarkably improved.

[Brief description of drawings]

1 and 2 are sectional views showing an embodiment of the product of the present invention. 1 ... open tank, 2 ... can, 3 ... radiator, 4 ...
... circulation pipe, 5 ... open / close valve, 6 ... lower tank, 6 '
...... Lower tank, 7 ... Burner

Claims (2)

(57) [Claims] 1. An open tank 1 communicating with the atmosphere, a hot water can 2 provided at a position lower than the open tank 1 to form a water storage can that can be sealed, and a radiator 3 to which hot water of the hot water can 2 is supplied. The open tank 1, the kettle 2, the radiator 3, and the open tank 1 are connected by a circulation pipe 4, and a water circulation path is formed by the circulation pipe 4, and the open tank 1 and the kettle 2 are connected in the circulation pipe 4. The open / close valve 5 is attached to the circulation pipe 4'that communicates with the open water tank 1 at the high position when the open / close valve 5 is opened.
Into the circulation pipe 4 that forms a circulation path by intermittent operation by the open / close valve 5 that repeatedly opens and closes by flowing hot water to the open tank 1 via the radiator 3 by the vapor pressure generated in the kettle 2 when the open / close valve 5 is closed. In the circulation device in which hot water flows, the boiling can 2 is installed in the combustion gas flow path of the burner 7, and the open tank 1 has a cylindrical lower tank 6 formed on the outer periphery of the boiling can 2 and the boiling can 2. A circulation pipe 4 ″, which is located at the upper side and is composed of an upper tank 6 ′ that forms a water storage tank communicating with the lower tank 6, is located in the middle of the circulation pipe 4 at the outlet side of the radiator 3. A hot water circulation device characterized in that it is connected to the bottom of the lower tank 6. 2. An upper part of a lower tank 6 provided on the outer periphery of a kettle 2 constituting an open tank 1 is continuously formed with a lower part of an upper tank 6'provided above the kettle 2 to form an integrated opening. The hot water circulation device according to claim 1, wherein the tank 1 is heated by the burner 7 together with the water boiler 2.