JPH0730925B2 - Heat carrier - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device that transfers heat to a use side by utilizing a pressure increase when heating a refrigerant.

2. Description of the Related Art In order to perform a heat-driven heat transfer method in which a refrigerant is heated by combustion heat from a burner or the like and the pressure of the evaporated refrigerant is circulated, the liquid refrigerant filled in the receiver is intermittently filled. To the refrigerant heater. This intermittent supply cycle is set according to the case where the temperature (or pressure) is the highest among the heat transfer conditions due to the restriction of the physical property value of the refrigerant. That is, the liquid refrigerant is intermittently supplied at the shortest cycle determined to be optimum for the highest temperature (or pressure) in the operating range of the system.

However, in the conventional method as described above, the amount of refrigerant entering the heater and the amount of refrigerant leaving the heater are not balanced under the condition of low operating temperature (or pressure) of the system. Occasionally, hunting may occur in which the temperature (or pressure) rises and falls due to the temperature. If this hunting is violent, the refrigerant heater may locally run out of liquid refrigerant and heat up. There were problems in system reliability such as thermal decomposition of the refrigerant and durability of the refrigerant heater.

The present invention is to solve the above-mentioned conventional problems, by automatically and stably supplying the required liquid refrigerant to the refrigerant heater, and performing a stable refrigerant heating operation without causing refrigerant heating, etc. The purpose is to provide a device.

Means for Solving the Problems In order to solve the above problems, the heat transfer device of the present invention is provided with an annular passage portion in which a refrigerant heater and a gas-liquid separator are connected by piping, and a liquid receiving device is provided above the gas-liquid separator. Connecting the container to the annular passage portion with a drop pipe having a first check valve and a pressure equalizing pipe having an on-off valve, and the gas-liquid separator,
Temperature or pressure detected by a temperature detector or a pressure detector provided on the outlet side of the refrigerant heater by connecting the radiator, the second check valve, and the liquid receiver in sequence to form an annular heat transfer path. In addition to changing the opening / closing operation cycle of the opening / closing valve in accordance with the change of {circle over (1)}, a control device having an upper limit value and a lower limit value of the opening / closing operation cycle is provided.

Further, the control device in the heat transfer device of the present invention is configured to change the upper limit value and the lower limit value of the opening / closing operation cycle according to the heat input in the refrigerant heater.

Action With the above configuration, the opening / closing operation cycle of the opening / closing valve is set so that the amount of refrigerant intermittently supplied from the liquid receiver to the refrigerant heater by the opening / closing operation cycle of the opening / closing valve is optimized according to the temperature or pressure of the refrigerant. In addition, by setting the deviation of the optimum value between the upper limit value and the lower limit value of the opening / closing operation cycle of the opening / closing valve due to the difference in the installation state of the radiator and the receiver, etc., from the refrigerant heater to the radiator. Balance the amount of refrigerant that is pumped and condensed with the required amount of refrigerant that is supplied to the refrigerant heater, and the refrigerant that is required for the refrigerant heater is stably supplied, causing refrigerant overheating, etc. Instead, a stable refrigerant heating operation is performed.

Further, since the control device changes the upper limit value and the lower limit value of the opening / closing operation cycle according to the heat input in the refrigerant heater,
Stable operation can be performed easily and with high responsiveness even when the cycle operation operating conditions change.

Examples Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is a system configuration diagram of a heat transfer device showing an embodiment of the present invention. In FIG. 1, the gas-liquid separator 1 is arranged above the refrigerant heater 2 and the refrigerant heater 2
The inlet pipe 3 and the outlet pipe 4 of the refrigerant heater 2 are connected to form an annular passage portion. Further, the liquid receiver 5 is arranged above the gas-liquid separator 1, and the liquid receiver 5 is connected to the gas-liquid separator 1 forming the annular passage portion by a drop pipe 7 having a first check valve 6, and The liquid receiver 5 is connected to the refrigerant heater outlet pipe 4 forming an annular passage portion by a pressure equalizing pipe 9 having an opening / closing valve 8 so that the liquid receiver 5 and the refrigerant heater 2 are connected. The gas-liquid separator 1 and the radiator 10 are connected by a gas refrigerant outflow pipe 11, and the radiator 10 and the liquid receiver 5 are connected by a liquid refrigerant return pipe 13 having a second check valve 12. As described above, the gas-liquid separator 1, the radiator 10, the second check valve 12, the liquid receiver 5 and the first check valve 6 form an annular heat transfer path sequentially connected by piping. The temperature detector 14 is provided in the outlet pipe 4 of the refrigerant heater 2. Further, the controller 15 is electrically connected to the on-off valve 8 and the temperature detector 14. The burner 16 is provided in the refrigerant heater 2 and heats the refrigerant. The combustion amount changing device 17 is provided in the fuel amount supply passage of the burner 16 and can change the combustion amount of the burner 16. Reference numeral 18 is a blower provided in the radiator 10.

The operation of the above configuration will be described below. In the refrigerant heater 2, the refrigerant heated by the combustion heat of the burner 16 is in a two-phase state in which gas and liquid are mixed, and the refrigerant heater outlet pipe 4
And then flows into the gas-liquid separator 1, and the liquid refrigerant flows into the refrigerant heater 2 again through the refrigerant heater inlet pipe 3. On the other hand, of the two-phase state refrigerant that has flowed into the gas-liquid separator 1, the gas refrigerant passes through the gas refrigerant outflow pipe 11, and the radiator 10 dissipates heat to the air on the use side by the operation of the blower 18 to be condensed and liquefied. Here, when the on-off valve 8 is closed, the refrigerant condensed and liquefied from the radiator 10 to the liquid receiver 5 is transferred to the second side by the liquid refrigerant return pipe 13.
It is sent through the check valve 12. At this time, since the pressure inside the liquid receiver 5 is lower than the pressure inside the gas-liquid separator 1, the first check valve 6 is closed. In this state,
When the open / close valve 8 is opened, the liquid receiver 5 and the gas-liquid separator 1 communicate with each other through the pressure equalizing pipe 9 to be in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 5 gravitationally causes the first check valve 6 to flow. It passes through and flows into the gas-liquid separator 1. Next, when the on-off valve 8 is closed again, the first check valve 6 is closed, and the condensed liquid refrigerant of the radiator 10 is pumped into the liquid receiver 5 by the pressure of the refrigerant evaporated by the heat of the burner 16. Then, the cycle in which the liquid receiver 5 is filled with the liquid refrigerant is repeated.

In this way, the gas-liquid separator 1 and the refrigerant heater 2 are in a natural circulation cycle due to the evaporated refrigerant pressure, and the supply of the liquid refrigerant from the liquid receiver 5 to the gas-liquid separator 1 and the refrigerant heater 2 is opened and closed. This is an intermittent operation cycle depending on the opening / closing cycle of the valve 8.

By changing the opening / closing operation cycle of the opening / closing valve 8 by the control device 15 in this intermittent operation cycle, the amount of refrigerant supplied to the refrigerant heater 2 can be set appropriately.

2 and 3 show that the opening time of the on-off valve 8 is constant,
The closing time is determined by the temperature detector 14 provided on the outlet side of the refrigerant heater 2.
The case where the temperature is changed by the control device 15 in accordance with the temperature detected in FIG. 2 and 3, time
When the cycle operating temperature detected by the temperature detector 14 at T ₁ is θ ₁ , the closing time of the on-off valve 8 is τ _off1.
off1 is set at a certain point C ₁ within the operating range between the upper limit value A ₁ and the lower limit value B ₁ of the closing time τ _off1 with respect to the temperature θ ₁ shown in FIG. Next, at time T ₂ , when the cycle operating temperature rises to θ ₂ with the lapse of time from time T ₁ , the on-off valve 8
The closing time of changes to τ _off2 and becomes shorter. This closing time τ
_off2, like when the temperature theta _1, are set at the upper limit value A ₂ and point C ₂ with operation region between the lower limit value B ₂ at the temperature theta _2. Here is a τ _off1> τ _off2.

Next, when the distance (pipe length) between the radiator 10 and the receiver 5 or the height of installation is changed, for example, when the distance (pipe length) is long and the radiator 10 is at a position lower than the receiver 5. , ₁ cycle operating temperature theta, theta C ₁ a third view of ₂ by closing time operating region, C ₂ a point of τ _off1 a, τ _off2 a next, between closing tau
_{As off} changes to a longer direction, the system can perform stable refrigerant heating operation.

As described above, the limit of the closing time is set by the upper limit value and the lower limit value of the opening / closing operation cycle of the opening / closing valve 8, and therefore, the supply amount of the liquid refrigerant in the intermittent operation cycle and the evaporation by the refrigerant heater 2 and the radiator 10 A stable refrigerant heating operation can be performed automatically without generating an extreme imbalance with the amount of refrigerant condensed in the system, and the reliability of the system can be improved, and the positions of the radiator 10 and the receiver 5 can be improved. Relation, in other words, to improve the installation flexibility by absorbing the deviation of the optimum value of the opening / closing operation cycle of the opening / closing valve 8 due to the difference in installation state such as the positional relationship between the radiator 10 and the receiver 5 and the height difference. You can

Next, an embodiment of the control device 15 for changing the upper limit value and the lower limit value of the opening / closing operation cycle of the opening / closing valve 8 will be described.

When the combustion amount of the burner 16 provided in the refrigerant heater 2 is changed by the combustion amount varying device 17, it is necessary to set the upper limit value and the lower limit value in response to changes in heat input. FIG. 4 shows the case where the combustion amount is controlled by Hi-Lo, and the upper limit value and the lower limit value of the closing time are provided for each combustion amount of Hi combustion and Lo combustion.

The above is the amount of combustion Hi-Lo control, but also when more control or proportional control is performed, depending on the amount of combustion, that is, the upper and lower limit values of the opening and closing operation cycle according to the heat input. By setting, it is possible to achieve stable operation easily and with good responsiveness even when the cycle operation conditions change due to changes in heat input, and it is possible to provide a highly practical system to which heat input control is added.

The above shows that the opening / closing operation cycle of the on-off valve 8 is controlled by the temperature detected by the temperature detector 14 provided on the outlet side of the refrigerant heater, but the refrigerant on the outlet side of the refrigerant heater 2 is in a two-phase state. Yes, there is a certain relationship between temperature and pressure.
Obviously, instead of 14, a pressure detector could similarly control the opening and closing cycle.

EFFECTS OF THE INVENTION As described above, according to the present invention, the opening / closing operation cycle of the on-off valve is changed according to the change in the temperature or pressure detected by the temperature detector or the pressure detector provided on the outlet side of the refrigerant heater. By providing the control device having the upper limit value and the lower limit value of the opening / closing operation cycle, the stable refrigerant heating operation without the conventional refrigerant heating can be performed, and the reliability of the system can be improved. The refrigerant heating operation corresponding to the distance between the radiator and the liquid receiver and the height difference position can be performed, the degree of freedom in installation is improved, and the convenience of the system is improved.

Further, since the control device can change the upper limit value and the lower limit value of the opening / closing operation cycle according to the heat input, it is possible to achieve stable responsive refrigerant heating operation even when the heat input changes, and to control the heat input. It is possible to provide an added system with high practicality.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a heat transfer device showing an embodiment of the present invention, FIG. 2 is a diagram for explaining a system operation of a heat transfer device showing an embodiment of the present invention, and FIG. FIG. 4 is a temperature closing time characteristic diagram of the opening / closing valve in the transfer device, and FIG. 4 is a temperature closing time characteristic diagram of the opening / closing valve in the heat transfer device showing another embodiment of the present invention. 1 ... Gas-liquid separator, 2 ... Refrigerant heater, 3 ... Inlet pipe, 4 ... Outlet pipe, 5 ... Liquid receiver, 6 ... First check valve,
7: Drop pipe, 8: Open / close valve, 9: Pressure equalizing pipe, 10 ...
Radiator, 11 …… Gas refrigerant outflow pipe, 12 …… Second check valve, 13
...... Liquid refrigerant return pipe, 14 ...... Temperature detector, 15 ...... Control device, 17 ...... Variable heat input device.

Claims (2)

[Claims] 1. An annular passage portion is provided in which a refrigerant heater and a gas-liquid separator are connected by piping, and a liquid receiver provided above the gas-liquid separator has a first check valve and a drop pipe and an on-off valve. The gas-liquid separator, the radiator, the second check valve, and the liquid receiver are sequentially connected by piping to form a ring-shaped heat transfer path, which is connected to the annular passage portion with a pressure equalizing pipe, and the refrigerant heater A control device is provided which changes the opening / closing operation cycle of the opening / closing valve according to a change in temperature or pressure detected by a temperature detector or a pressure detector provided on the outlet side and has an upper limit value and a lower limit value of the opening / closing operation cycle. Heat transfer device. 2. The heat transfer device according to claim 1, wherein the control device is configured to change an upper limit value and a lower limit value of the opening / closing operation cycle according to heat input to the refrigerant heater.