JPH0424430A - Heater - Google Patents

Abstract

PURPOSE:To make it possible to circulate refrigerant, maintain a heating capacity, minimize restrictions about connection pipe length, and improve the degree of installation freedom by allowing an accumulator to be positioned slightly below a separator, communicate both the accumulator and separator at each top, and opening and closing a control valve intermittently. CONSTITUTION:The refrigerant heated and pressurized with a refrigerant heater 1, is fed to an indoor side heat exchanger 3 by opening and closing a control valve 8 intermittently where condensed and liquefied refrigerant is returned to the refrigerant heater 1 once again. In order to stabilize the liquid level in an accumulator 7 in addition to a separator 2, the volumetric capacity of the accumulator is effective used, and the allowable connection pipe length is extended so as to enhance the degree of installation freedom. In addition, The accumulator 7 is positioned slightly below the accumulator 2 and both the accumulator and the separator are communicated with each other at their respective top so that the liquid level in the separator 2 may be lowered. As a result, the air and vapor separation performance of the separator 2 is improved. Moreover, the degree of humidity of the two phase refrigerant which is fed to the indoor heat exchanger 3 from the separator 2 is minimized dramatically so that the refrigerant whose enthalpy is large may flow into the indoor heat exchanger 3, thereby improving the heating capacity of the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial 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.

BACKGROUND ART Conventionally, as shown in FIG. 2, a heating machine equipped with this type of refrigerant heater includes a refrigerant heater 1, a separator 2, an indoor heat exchanger 3, a first check valve 4, and a receiver 5. , the second check valve 6 is connected in an annular manner to constitute a refrigerant circulation circuit, the separator lake 2 is located above the refrigerant heater 1, and the second check valve 6 is located above the separator 2, Furthermore, receiver 5 is the second
A control valve that is connected above the check valve 6 and that opens and closes intermittently during refrigerant heating operation is provided on a connecting pipe that branches between the separator 2 and the indoor heat exchanger 3 and bypasses the receiver 5. 8 was set.

Problems to be Solved by the Invention However, in the above configuration, the refrigerant boiled in the refrigerant heater 1 violently blows up into the separator 2 in two phases, agitating the inside of the separator 2, and causing gas and liquid to flow inside the separator 2. Separation and liquid level stability could not be achieved. In other words, since gas-liquid separation is not sufficient, a two-phase refrigerant with high humidity is conveyed to the indoor heat exchanger 3, and the enthalpy difference between the refrigerants that contributes to heating is not sufficiently counted. There was a problem in that the amount of heat transferred from the outdoor unit side to the indoor unit side decreased. In addition, changes in the refrigerant filling amount corresponding to changes in the length of the connection piping between the outdoor unit and the indoor unit should originally be absorbed by the internal volume of the separator 2, that is, above and below the liquid level, but when the liquid level Since it is agitated and unstable, the internal volume of separator 2 is not effectively utilized, and the allowable connection piping length is greatly limited.On the other hand, in order to solve the problem of reduced capacity and restrictions on the connection piping length. In order to reduce the influence of internal agitation, the volume of the separator 2 should be increased and a panful should be provided to reduce the effect of internal agitation, but this increases the cost due to pressure resistance and increases the wall thickness of the separator 2. there were.

The present invention solves such conventional problems by reducing the influence of stirring of the refrigerant in the separator, ensuring heating capacity, absorbing relative changes in the amount of refrigerant charged due to changes in the length of the connecting piping, and reducing the influence of stirring of the refrigerant in the separator. The purpose of the present invention is to provide a heating device that reduces the constraints of the heating system and improves the degree of freedom in installation.

Means for Solving the Problems In order to solve the above problems, the heating machine of the present invention includes a refrigerant heater, a separator, an indoor heat exchanger, a first check valve, a receiver, a second check valve, and an accumulator. A control valve that opens and closes intermittently during refrigerant heating operation is provided on the connecting pipe that connects to the separator and the indoor heat exchanger and bypasses the receiver, and the accumulator is placed above the refrigerant heater. and is located slightly below the separator. In addition, the accumulator and the separator communicate with each other at the bottom and also communicate with each other at the top, and a second check valve is provided at the top of the accumulator, and a receiver is connected to the top of the second check valve. It is being

With this configuration, when heating the refrigerant, the refrigerant heated by the refrigerant heater boils and enters the separator in two phases, where it is separated into gas and liquid. Since there are two check valves, it flows to the indoor heat exchanger, condenses and liquefies, passes through the first check valve, and flows into the receiver. When the control valve opens, the pressure in the separator, receiver, and accumulator becomes equal, and the liquefied refrigerant accumulated in the receiver is
If there is an automatic pressure higher than the closing pressure of the second check valve, it will fall into the accumulator due to natural head and then fall into the refrigerant heater. At this time, the liquefied refrigerant flowing in through the first check valve causes condensation, and at this time, the pressure inside the receiver is reduced, and a force acts to draw the refrigerant from the direction of the indoor heat exchanger. By opening and closing the control valve intermittently in this way,
The refrigerant heated and pressurized by the refrigerant heater is sent to the indoor heat exchanger, and the condensed and liquefied refrigerant is returned to the refrigerant heater again. However, since the separator and accumulator are provided separately, the separator The accumulator is less affected by the agitation caused by the refrigerant that is blown up in two phases.
The liquid level in the accumulator will become stable. Also,
The accumulator is located slightly lower than the separator, and the bottoms of each are in communication, and the tops of each are also in communication, so
The liquid level in the separator becomes lower, and the buffer volume of the refrigerant blown up from the refrigerant heater becomes larger, improving gas-liquid separation and reducing the wetness of the two-phase refrigerant flowing from the separator to the indoor heat exchanger. becomes significantly smaller.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

In FIG. 1, l is a refrigerant heater, 2 is a separator, and 3 is a refrigerant heater.
is the indoor heat exchanger, 4 is the first check valve, 5 is the receiver, 6
7 is a second check valve, and 7 is an accumulator, which are connected in a ring to form a refrigerant circulation circuit. Also, 8
A control valve is provided on a connecting pipe that branches between the separator 2 and the indoor heat exchanger 3 and bypasses the receiver 5, and the control valve 8 is configured to be opened and closed intermittently during heating of the refrigerant. Further, the accumulator 7 is connected to the refrigerant heater 1
The accumulator 7 and the separator 2 communicate with each other at their bottoms and also communicate with each other at their tops, and a second check valve 6 is located at the top of the accumulator trough. However, a receiver 5 is further connected to the upper part of the second check valve 6.

In the above configuration, when heating the refrigerant, the refrigerant heated by the refrigerant heater 1 boils and enters the separator 2 in two phases,
Since the control valve 8 and the second check valve 6 are closed, the two-phase refrigerant, which is gas-liquid separated and has a low humidity, is transferred to the indoor heat exchanger 3.
It is condensed and liquefied, passes through the first check valve 4, and flows into the receiver 5.

When the control valve 8 opens, the pressure of the separator 2, receiver 5, and accumulator 7 becomes equal, and the liquefied refrigerant accumulated in the receiver 5 will be caused by natural head if there is an automatic pressure higher than the closing pressure of the second check valve 6. It falls into the accumulator 7 and further into the refrigerant heater 1.

When the control valve 8 opens, the gas phase refrigerant that enters the receiver 5 is condensed by the liquefied refrigerant that flows through the first check valve 4 when the control valve 8 is closed. The pressure inside is reduced, and a force acts to draw the refrigerant from the direction of the indoor heat exchanger 3. That is, by opening and closing the control valve 8 intermittently, the refrigerant heated and pressurized by the refrigerant heater 1 is sent to the indoor heat exchanger 3, and the condensed and liquefied refrigerant is circulated back to the refrigerant heater 1. There is.

Here, since the accumulator 7 is provided separately from the separator 2, the accumulator 7 is not easily affected by the agitation caused by the refrigerant that is blown up in two phases from the refrigerant heater 1 to the separator 2. The liquid level is easy to stabilize. Furthermore, since the accumulator 7 is located slightly lower than the separator 2 and communicates with each other at the bottom and the top of each, the liquid level inside the separator 2 becomes low and the refrigerant blown up from the refrigerant heater 1 The buffer volume that kills the momentum becomes larger, the gas-liquid separation performance of the separator 2 improves, and the wetness of the two-phase refrigerant flowing out from the separator 2 to the indoor heat exchanger 3 becomes significantly smaller.

Therefore, since the liquid level in the accumulator 7 is stabilized, the volume in the accumulator 7 can be used effectively.
Even if the length of the connecting piping changes considerably, the amount of refrigerant required for circulating heat transfer can be absorbed within the range where the liquid level in the accumulator 7 rises and falls, which has the effect of increasing the degree of freedom in installation.

In addition, 2 which exits from the separator 2 to the indoor heat exchanger 3
Since the humidity of the phase refrigerant is small, a refrigerant with a large enthalpy will flow into the indoor heat exchanger 3, and the indoor heat exchanger 3 can be made smaller or the heating output can be improved. effective.

Effects of the Invention As described above, according to the heater of the present invention, the following effects can be obtained.

(1) Since the separator and accumulator are provided separately, it is less susceptible to agitation caused by the refrigerant blown into the separator, and the liquid level in the accumulator is easily stabilized, so the internal volume of the accumulator can be used effectively. Even if the amount of refrigerant corresponding to the capacity changes in the range where the surface level goes up and down, there is no change in the refrigerant circulation cycle.In other words, the allowable length of the connecting piping is expanded, which has the effect of improving installation freedom. .

(2) The separator is located slightly above the accumulator, and the bottoms of each are connected, and the tops of each are also connected, so the liquid level inside the separator is low, killing the momentum of the refrigerant blown up from the refrigerant heater. This results in a larger buffer volume, which leaves the separator to the indoor heat exchanger2.
The wetness of the phase refrigerant decreases, which means that a refrigerant with a large enthalpy flows into the indoor heat exchanger, which has the effect of making the indoor heat exchanger smaller or increasing the heating output. There is.

(3) Since the separator and accumulator are provided separately, if one unit were to have the same function, it would be a fairly large container and have a large wall thickness due to its pressure resistance.In comparison, each can be a small container and the wall thickness is small. The manufacturing cost of the container is also reduced, and the brazing of the piping becomes easier.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a heater according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional heater. 1... Refrigerant heater, 2... Separator, 3... Indoor heat exchanger, 4... First check valve, 5... ...Receiver, 6...Second check valve, 7...Accumulator, 8...Control valve. Name of agent Patent attorney Shigetaka Awano Haka1 person/->9 -I 4- Akira 5- Shi V Article 7σ Soni Nozu Lake I + l - Crossroad Town & l Reverse L - 45 - Shi - Nog ! i11 Sakuramasu

Claims (1)

[Claims] A refrigerant heater, a separator, an indoor heat exchanger, a first check valve, a receiver, a second check valve, an accumulator, and the refrigerant heater are sequentially connected in a ring, and a low boiling point refrigerant such as fluorocarbon is used as a working medium. The separator is located above the refrigerant heater, the accumulator is located above the refrigerant heater and slightly below the separator, and the accumulator and separator are located above the refrigerant heater and slightly below the separator. The bottom portions communicate with each top portion, the second check valve is connected to the top of the accumulator, and the receiver is connected to the top of the second check valve, and the separator and the indoor heat exchanger are connected to the second check valve. A heating machine that is provided with a control valve that opens and closes intermittently during refrigerant heating operation on a connecting pipe that branches between the heater and the receiver and bypasses the receiver.