JPH0827006B2 - Heat carrier - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer machine for heating by a non-powered heat transfer method via a refrigerant.

2. Description of the Related Art Conventionally, there is a liquid pump transfer type heating device provided with a refrigerant heater in order to prevent a decrease in heating capacity at low outside air temperature and a low running cost in a heating device using a refrigerant. In this system, the refrigerant heater evaporates the refrigerant, the indoor heat exchanger condenses it into liquid, and the liquid refrigerant is pumped again to the refrigerant heater. However, even in the above-mentioned method, since the operation cost of the pump is required, there is a conventional one that performs this pump function by the pressure difference of the refrigerant. (For example, Japanese Utility Model Laid-Open No. 61-43679) A heating device of this type has a refrigerant heater 1 as shown in FIG.
The gas-liquid separator 3 is located at an intermediate position of the receiver 2 which is located higher.
And a check valve 5 for equalizing the pressure between the liquid receiver 2 and the gas-liquid separator 3, and a check valve 5 between the liquid receiver 2 and the gas-liquid separator 3. Refrigerant heater 1 having a configuration having
The refrigerant that has evaporated in 2 passes through the connecting pipe 7 and is condensed by the radiator 6 and flows into the liquid receiver 2 through the connecting pipe 8. When the liquid refrigerant collects in the liquid receiver 2, the on-off valve 4 is opened and the liquid receiver 2 and the gas-liquid separator 3 are pressure-equalized so that the liquid refrigerant in the liquid receiver 2 flows into the gas-liquid separator 3.
When the inflow is completed, the on-off valve 4 is closed and the check valve 5 is also closed, so that the liquid refrigerant condensed from the radiator 6 is pumped to the liquid receiver 2 and flows in again. By repeating such operations, heat transfer is performed to perform heating operation.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, the gas-liquid separator 3 is arranged above the refrigerant heater 1, and the check valve 5 and the liquid receiver 2 are arranged above the gas heater 3 so that the height of the device is high. There is a problem that the size of the direction becomes large. Further, in the closed container configuration in which the liquid receiver 2 is only a container, when the liquid refrigerant flows into the liquid receiver 2 from the radiator 6, high-pressure gas exists in the liquid receiver 2 and the high pressure gas The action of cooling and condensing with the refrigerant to lower the internal pressure of the receiver is not sufficient, and as a result, it is necessary to reduce the amount of heat transfer and to obtain a sufficient degree of supercooling of the liquid refrigerant flowing into the receiver 2. There was a problem that the amount of refrigerant in the cycle became large and the amount of refrigerant in the cycle increased. Further, when the resistance of the on-off valve 4 is large, it takes a long time to open the on-off valve which completely discharges the liquid refrigerant from the liquid receiver 2 to the gas-liquid separator 3 due to the gravity difference, and as a result, G = V × γ / T G: Refrigerant circulation amount required for capacity (g / sec) V: Liquid receiver volume (cc) γ: Liquid refrigerant density in receiver (g / cc) T: Open / close valve cycle (open time + As can be seen from (closing time) (sec), T increases and G decreases,
Since the heat transfer amount cannot be large and the direct-acting solenoid valve has a problem that the maximum operating pressure difference decreases when the port diameter is increased and the resistance is reduced, the operation to reliably open and close the on-off valve is unreliable. It was

Means for Solving the Problems In order to solve the above problems, the heat carrier of the present invention has a refrigerant heater and a gas-liquid separator arranged above the refrigerant heater connected in a loop. A gas-liquid separator, a radiator, a first check valve, a liquid receiver disposed above the gas-liquid separator, and a second check valve, which are connected in a loop in sequence to form a refrigerant circuit, An on-off valve outlet pipe having a pressure equalizing pipe for equalizing the pressure of the gas-liquid separator and a U-shaped pipe connecting the first check valve are provided in the upper part of the liquid receiver, and the second check valve is the receiving pipe. In addition to being constructed within the outer shell of the liquid container, punching metal is provided in the upper part inside the liquid receiver, and the opening / closing valve is equipped with a pilot type solenoid valve with a small passage resistance and a large maximum differential pressure difference. .

According to the present invention, since the second check valve is configured in the same outer shell that configures the liquid receiver by the above-described configuration, the brazing work between the second check valve and the liquid receiver can be omitted, and the second check valve can be omitted. Since it is not necessary to lengthen the copper pipe portion for avoiding the thermal influence at the time of brazing on the receiver side of the check valve, it is possible to process it in a small and compact size. Further, the condensed liquid refrigerant flowing from the first check valve hits the punching metal and the liquid refrigerant scatters, the area where the liquid refrigerant contacts the gas refrigerant increases, the gas-liquid mass transfer is promoted, and a large degree of supercooling is not required. The internal pressure of the receiver can be reduced with a small degree of supercooling, and the pilot solenoid valve is installed on the on-off valve, so the flow resistance is small and the maximum operating pressure difference is large, so gas-liquid separation from the receiver The time required for the liquid refrigerant to completely flow out to the container can be shortened, the amount of heat transfer can be increased, and the reliability of the operation for opening and closing the liquid refrigerant can be improved.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts as those in FIG. 2 are designated by the same reference numerals. In FIG. 1, 1 is a refrigerant heater disposed below the gas-liquid separator 3, 7 and 8 are inlet connection pipes and outlet connection pipes of the radiator 6, and 9 is a first check valve which is a forward outlet. The side is connected to the upper part of the receiver 2 by a U-shaped tube 10. The second check valve 5 including the valve seat 11, the valve body 12 and the spring 13 is caulked on the outer shell of the receiver 2 which is drawn from the outer diameter of the receiver to the outer diameter of the valve seat 11. A punching metal is inserted in the upper part of the liquid container 2. Further, 4 is a pilot type solenoid valve having an equalizing pipe 17 branched from the inlet connecting pipe 7 on the inlet side, and an outlet pipe 15 is connected above the liquid receiver 2, and 16 is a pilot solenoid valve. A control device for controlling the opening / closing operation of the solenoid valve, and a burner 18 for heating the refrigerant heater 1.

In the above structure, the refrigerant heated by the refrigerant heater 1 by the combustion heat of the burner 18 flows into the gas-liquid separator 3 in a two-phase state, and the liquid refrigerant again flows into the refrigerant heater 1. On the other hand, gas-liquid separator 3
The gas refrigerant of the two-phase refrigerant flowing in from the refrigerant heater 1 passes through the inlet connection pipe 7 and is condensed and liquefied by the radiator 6. At this time, when the pilot type solenoid valve 4 is closed, the second check valve 5 is closed and the condensed liquid refrigerant from the radiator 6 to the liquid receiver 2 is transferred to the first check valve 9,
Punching metal in the receiver 2 that is pumped through the U-tube 10
At 14, the gas refrigerant and gas-liquid mass transfer in the liquid receiver 2 are promoted, the pressure in the liquid receiver 2 drops, and the condensed liquid refrigerant accumulates in the liquid receiver 2. When the pilot type solenoid valve 4 is opened in this state, the liquid receiver 2 and the gas-liquid separator 3 are in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 2 passes through the second check valve 5 and the gas-liquid separator 3 Flows in. At this time, the first check valve 9 is closed. Next, when the pilot type solenoid valve is closed, the second check valve 5 is closed and the condensed liquid refrigerant flows into the receiver 2 from the radiator 6 again to fill the receiver 2 with the condensed liquid refrigerant. Repeat the cycle of opening. That is, the natural circulation cycle between the gas-liquid separator 3 and the refrigerant heater 1, the cycle of the gas-liquid separator 3, the radiator 6, the first check valve 9, the liquid receiver 2 and the second check valve 5 is: This is an intermittent operation cycle in which the liquid refrigerant from the radiator 6 is accumulated in the liquid receiver 2 and is intermittently supplied to the gas-liquid separator 3. Therefore, the receiver 2, the pilot type solenoid valve 4,
The second check valve 5 and the first check valve 9 function as a heat carrier,
The receiver 2 and the second check valve are processed by caulking the valve seat 11 on the outer shell of the receiver 2 which is drawn from the outer diameter of the receiver 2 to the outer diameter of the valve seat 11 It is not necessary to lengthen the copper pipe part for avoiding the thermal influence at the time of brazing of the liquid receiver 2 side of the valve 5, the brazing work can be omitted, and the outlet side of the first check valve 9 is U-shaped.
In addition to the fact that it is connected to the upper part of the receiver by a character tube, there is an effect that the heat carrier unit can be processed into a small size and a compact size. Further, the condensed liquid refrigerant flowing from the first check valve 9 hits the punching metal 14 to promote the gas-liquid mass transfer, so that the internal pressure of the receiver 2 can be reduced with a small degree of supercooling, and the radiator 6 can be made compact. A system using this type of heat carrier can be made smaller and more compact, and by using a pilot type solenoid valve for the on-off valve, the solenoid valve port diameter can be increased to reduce the resistance and the maximum differential pressure difference. Can be set to a large value, the opening time of the solenoid valve when the liquid refrigerant is supplied from the liquid receiver 2 to the gas-liquid separator 3 can be shortened, the heat transfer amount can be increased, and the solenoid valve can be opened and closed. The operation is surely performed, and the performance and reliability of this type of heat carrier are improved.

Effects of the Invention As described above, according to the heat carrier of the present invention, the following effects are obtained.

(1) Since the second check valve is configured in the outer shell of the receiver and the outlet of the first check valve is connected to the upper part of the receiver with a U-shaped pipe, the heat transfer machine can be made compact and compact. be able to.

(2) The punching metal provided in the receiver allows the gas-liquid mass transfer in the receiver to be promoted and the pressure inside the receiver to be lowered with a small degree of supercooling. It is possible to downsize the radiator.

(3) By using a pilot type solenoid valve with a large maximum differential pressure difference and a large port diameter for the on-off valve, the time to supply the liquid refrigerant from the receiver to the heating section can be shortened, resulting in heat transfer. It is possible to provide a heat carrier having an increased amount and an excellent opening / closing performance and reliability.

[Brief description of drawings]

FIG. 1 is a system circuit block diagram using a heat carrier according to an embodiment of the present invention, and FIG. 2 is a system circuit block diagram using a conventional heat carrier of this type. 2 ... Liquid receiver, 4 ... Open / close valve (pilot type solenoid valve),
5 ... Second check valve, 9 ... First check valve, 10 ... U-tube,
14 ... punching metal.

Claims (2)

[Claims] 1. A refrigerant heater and a gas-liquid separator disposed above the refrigerant heater are connected in a loop, while the gas-liquid separator, a radiator, a first check valve, and the gas-liquid separator. A gas-liquid device arranged above the separator and a refrigerant circuit in which a second check valve is sequentially connected in a loop shape are provided, and a pressure equalizing pipe for equalizing the pressure of the gas-liquid separator is provided above the liquid receiver. A U-shaped pipe that connects the on-off valve outlet pipe and the first check valve is provided, and the second check valve is formed in the outer shell of the liquid receiver, and an upper portion in the liquid receiver. Heat transfer machine equipped with punching metal. 2. The heat carrier according to claim 1, wherein the on-off valve is a pilot type solenoid valve.