JPH04268124A - Room heater - Google Patents

Abstract

PURPOSE:To ensure an enough heat conveyance amount required for utilization of an outdoor combustion heat to indoor heating by a method wherein a receiver is located in an air feed pipe through which air is fed to a burner flows. CONSTITUTION:When a control valve 7 is closed, a receiver 5 is cooled by means of refrigerant gas flowing in a receiver 5 when the control valve 7 is opened and by the passage of the open air through an air feed pipe 10 with the aid of a burner fan 9. Thereby, the refrigerant gas is condensed, a pressure in the receiver 5 is reduced, a force by which a refrigerant is drawn from the direction of a heat exchanger 3 on the indoor side is exerted, and a liquid refrigerant is apt to enter the receiver 5. Further, the interior of the receiver 5 is condensed and a pressure therein is reduced by means of a liquid refrigerant flowing through a first check valve 4, and smooth circulation of a refrigerant is carried out. Thus, a pressure in the receiver 5 is rapidly reduced during closing of the control valve 7 and a pressure difference required for circulation of a refrigerant is smoothly produced.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to an apparatus for heating by connecting indoor and outdoor units with refrigerant piping, in particular, the outdoor unit is equipped with a refrigerant heater, and the refrigerant is heated by combustion.
This invention relates to a heater that performs heating by transporting heat to an indoor unit.

0002

BACKGROUND OF THE INVENTION Conventionally, a heating machine equipped with this type of refrigerant heater has a refrigerant heater 1, a separator 2, an indoor heat exchanger 3, a first check valve 4, a receiver, as shown in FIG. 5. The second check valve 6 is connected in an annular manner to constitute a refrigerant circulation circuit, and the separator 2 is located above the refrigerant heater 1.
The check valve 6 is located above the separator 2, and the receiver 5 is connected above the second check valve 6. The receiver 5 is branched between the separator 2 and the indoor heat exchanger 3, and the receiver 5 is connected above the second check valve 6.
A control valve 7 that opens and closes intermittently during refrigerant heating operation is provided on the connecting pipe that bypasses the refrigerant heater 1, and a burner 8 that heats the refrigerant heater 1 and a burner fan 9 that supplies air to the burner 8 and exhausts air from the burner 8. and an exhaust pipe 11, a refrigerant heater 1, a separator 2, a first check valve 4, a receiver 5, and a second check valve 6.
, a control valve 7, a burner 8, a burner fan 9, and an exhaust pipe 11 are housed in an outdoor unit 12, and air is supplied to the burner 8 by sucking outside air from a gallery 13 provided in the outdoor unit 12.

0003

However, in the above configuration, although the refrigerant circulates and heats are transferred using the refrigerant pressure difference by opening and closing the control valve 7, it is difficult to ensure a sufficient amount of circulation.

To explain the refrigerant circulation state, the refrigerant boils in the refrigerant heater 1 due to the heat of combustion in the burner 8, blows up in the separator 2 as a gas-liquid mixture, separates into gas and liquid in the separator 2, and refrigerant gas When the control valve 7 is closed, the refrigerant flows into the indoor heat exchanger 3 due to the presence of the second check valve 6, releases heat and condenses to become a liquid refrigerant, passes through the first check valve 4, and flows into the receiver 5. When the control valve 7 opens, the refrigerant heater 1, separator 2,
When the pressure in the receiver 5 is equalized and the liquid refrigerant accumulated in the receiver 5 has a self-weight pressure higher than the closing pressure of the second check valve 6, the liquid refrigerant falls to the refrigerant heater 1 by natural fall. When the control valve 7 opens, the refrigerant gas enters the receiver 5, and when the control valve 7 closes, the refrigerant gas enters the receiver 5.
The liquid refrigerant flowing in through the check valve causes condensation, and at this time, the pressure inside the receiver 5 is reduced, and the indoor heat exchanger 3
A force that draws the refrigerant from the direction acts, allowing smooth refrigerant circulation.

However, by opening and closing the control valve 7 intermittently in this manner, the refrigerant heated and pressurized by the refrigerant heater 1 is sent to the indoor heat exchanger 3 using the pressure difference, and the condensed and liquefied refrigerant is transferred to the indoor heat exchanger 3. The liquid refrigerant is circulated back to the refrigerant heater 1 again, but when the control valve 7 is closed, the liquid refrigerant that tries to enter the receiver 5 is cooled and condensed due to the heat capacity of the receiver 5, as the refrigerant gas remaining in the receiver 5 Since it takes time for the liquid refrigerant to enter, the gas pressure inside the receiver 5 is still high, making it difficult to reduce the pressure inside the receiver 5 due to the inflowing liquid refrigerant, and the pressurization in the refrigerant heater 1 becomes even greater. The liquid refrigerant is pushed out and flows into the receiver 5 from the indoor heat exchanger 3, and the inside of the receiver 5 suddenly begins to condense and depressurize, resulting in a refrigerant circulation operation in which the amount of refrigerant flowing in increases rapidly. The delay in reducing the pressure inside the receiver 5 when the valve 7 is closed makes it difficult to ensure a sufficient amount of refrigerant circulation. In other words, there was a problem in that it was difficult to secure the amount of heat conveyed to output the required heating capacity.

The present invention solves these conventional problems by quickly reducing the pressure inside the receiver when the control valve is closed, smoothly creating the pressure difference necessary for refrigerant circulation, and converting outdoor combustion heat into indoor heating. The purpose of the present invention is to provide a heater that secures a sufficient amount of heat transfer necessary for use in the field of heating.

[0007]

[Means for Solving the Problems] In order to solve the above problems, the heater of the present invention sequentially installs a refrigerant heater, a separator, an indoor heat exchanger, a first check valve, a receiver, and a second check valve. connected in a ring to form a refrigerant circulation circuit, the separator is located above the refrigerant heater, the second check valve is located above the separator, and the receiver is connected to the upper part of the second check valve,
A control valve that opens and closes intermittently during refrigerant heating operation is installed on the connecting pipe that branches between the separator and the indoor heat exchanger and bypasses to the receiver, and controls the burner that heats the refrigerant heater and the air supply to the burner. A burner fan, an air supply pipe, and an exhaust pipe are provided to exhaust air from the burner, and a refrigerant heater, a separator,
First check valve, receiver, second check valve, control valve, burner,
Place the burner fan, air supply pipe, and exhaust pipe in the outdoor unit.
A receiver is disposed inside the air supply pipe.

[0008]

[Operation] With this configuration, when heating the refrigerant, the refrigerant boiled in the refrigerant heater due to the combustion heat of the burner is blown up to the separator as a gas-liquid mixture, and is separated into gas and liquid within the separator.
When the control valve is closed, the refrigerant gas flows into the indoor heat exchanger due to the presence of the second check valve, releases heat and condenses to become liquid refrigerant, and flows into the receiver through the first check valve. When the control valve opens,
The pressure of the refrigerant heater, the separator, and the receiver becomes equal, and the liquid refrigerant accumulated in the receiver falls to the refrigerant heater by natural head if there is a self-weight pressure higher than the closing pressure of the second check valve. On the other hand, when the control valve closes, the refrigerant gas that entered the receiver when the control valve opened is condensed as outside air passes through the air supply pipe and the receiver is cooled by the burner fan that operates during combustion.
The pressure inside the receiver is reduced, and a force that draws the refrigerant from the direction of the indoor heat exchanger acts, making it easier for the liquid refrigerant to enter the receiver.Furthermore, the liquid refrigerant flowing through the first check valve causes the inside of the receiver to This results in condensation and reduced pressure, allowing smooth refrigerant circulation.

[0009]

[Embodiment] An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, 1 is a refrigerant heater, 2 is a separator, 3 is an indoor heat exchanger, 4 is a first check valve, 5 is a receiver, and 6 is a second check valve. The separator 2 is connected to the refrigerant heater 1 in an annular manner to form a refrigerant circulation circuit using a low boiling point refrigerant such as fluorocarbon as a working medium.
The second check valve 6 is located above the separator 2 , and the receiver 5 is connected to the upper part of the second check valve 6 . Further, 7 is a control valve, which is provided on a connecting pipe that branches between the separator 2 and the indoor heat exchanger 3 and bypasses to the receiver 5, and the control valve 7 is intermittently operated during the refrigerant heating operation. It is configured to open and close. Furthermore, 8 is a burner that heats the refrigerant heater 1, 9 is a burner fan that supplies air to the burner 8 and exhausts air from the burner 8, and 10
is an air supply pipe, 11 is an exhaust pipe, 12 is an outdoor unit, which includes a refrigerant heater 1, a separator 2, a first check valve 4, a receiver 5, a second check valve 6, a control valve 7, a burner 8, It houses a burner fan 9, an air supply pipe 10, and an exhaust pipe 11. The receiver 5 is arranged inside the air supply pipe 10.

In the above configuration, when heating the refrigerant, the refrigerant boiled in the refrigerant heater 1 due to the combustion heat of the burner 8 blows up to the separator 2 as a gas-liquid mixture, and is separated into gas and liquid within the separator 2, and the refrigerant gas is The control valve 7 is closed, and since the second check valve 6 is present, the refrigerant flows into the indoor heat exchanger 3, releases heat and condenses to become a liquid refrigerant, passes through the first check valve 4, and flows into the receiver 5. When the control valve 7 opens, the pressure of the refrigerant heater 1, separator 2, and receiver 5 becomes equal, and the liquid refrigerant accumulated in the receiver 5 has a self-weight pressure higher than the closing pressure of the second check valve 6. It falls to the refrigerant heater 1 due to natural head. On the other hand, when the control valve 7 is closed, the refrigerant gas that entered the receiver 5 when the control valve 7 was opened is condensed because the outside air passes through the air supply pipe 10 and the receiver 5 is cooled by the burner fan 9 that operates during combustion. , the pressure inside the receiver 5 is reduced, and a force that draws the refrigerant from the direction of the indoor heat exchanger 3 acts, making it easier for the liquid refrigerant to enter the receiver 5, and furthermore, the liquid flowing in through the first check valve 4 is The refrigerant condenses and reduces the pressure inside the receiver 5, allowing smooth refrigerant circulation. Therefore, when the control valve 7 is closed, the pressure inside the receiver 5 is quickly reduced, the pressure difference necessary for refrigerant circulation is smoothly created, and the amount of heat transferred is sufficient to utilize outdoor combustion heat for indoor heating. There are effects that can be ensured.

0012

[Effects of the Invention] As described above, according to the heating machine of the present invention,
The following effects can be obtained. (1) Since the receiver is installed in the air supply pipe through which air is supplied to the burner, the receiver can be cooled by low-temperature outside air by operating the burner fan during combustion operation, and the pressure inside the receiver can be quickly reduced. This has the effect of smoothly creating the pressure difference necessary for refrigerant circulation and ensuring a sufficient amount of heat transfer necessary for utilizing outdoor combustion heat for indoor heating. (2) When combustion is stopped, the refrigerant in the refrigerant heater evaporates due to residual heat from the burner and refrigerant heater, condenses and liquefies in the indoor heat exchanger, and is stored in the refrigerant heater when combustion starts. However, due to the burner fan's pre-purge and post-purge operations, the receiver is cooled by low-temperature outside air immediately before combustion starts and immediately after combustion stops, and the pressure in the receiver is lower than that of the indoor heat exchanger. The accumulation of liquid refrigerant in the exchanger can be reduced, refrigerant shortage in the refrigerant heater at the start of combustion can be eliminated, and heating starts smoothly.

[Brief explanation of the drawing]

[Fig. 1] A configuration diagram of a heating machine in an embodiment of the present invention.

[Figure 2] Configuration diagram of a conventional heater

[Explanation of symbols]

1 Refrigerant heater 2 Separator 3 Indoor heat exchanger 4 First check valve 5 Receiver 6 Second check valve 7 Control valve 8 Burner 9 Burna fan 10 Air supply pipe 11 Exhaust pipe 12 Outdoor unit

Claims (1)

[Claims] Claim 1: A refrigerant heater, a separator, an indoor heat exchanger, a first check valve, a receiver, a second check valve, and the refrigerant heater are sequentially connected in an annular manner, and a low boiling point refrigerant is used as a working medium. The separator is located above the refrigerant heater, the second check valve is located above the separator, and the receiver is connected to the top of the second check valve. A control valve that opens and closes intermittently during refrigerant heating operation is provided on a connecting pipe that branches between the separator and the indoor heat exchanger and bypasses the receiver, and a burner that heats the refrigerant heater is provided. and a burner fan for supplying air to the burner and exhausting air from the burner, an air supply pipe, and an exhaust pipe, the refrigerant heater, a separator, a first check valve, a receiver, a second check valve, a control valve, and a burner. , burna fan,
A heating machine in which an air supply pipe and an exhaust pipe are housed in an outdoor unit, and the receiver is arranged inside the air supply pipe.