JPH0697099B2 - Heating system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device that heats a refrigerant and performs heating operation by a non-powered heat transfer system.

2. Description of the Related Art In a conventional heating device of this type, as shown in FIG. 2, a gas-liquid separator 3 is arranged at an intermediate position of a liquid receiver 2 located above a refrigerant heater 1 and the liquid receiver 2 is provided. The refrigerant heater 1 has a structure in which an opening / closing valve 4 for equalizing the pressure of the both is provided between the gas-liquid separator 3 and a check valve 5 is further provided between the liquid receiver 2 and the gas-liquid separator 3. The evaporated refrigerant passes through the connecting pipe 7, is condensed by the heater 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 opens and the liquid receiver 2 and the gas-liquid separator 3 are pressure-equalized to allow the liquid refrigerant of the liquid receiver 2 to flow 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. (For example,
No. 61-43679), and an opening / closing valve configured to open / close appropriately at predetermined time intervals is also proposed.
(For example, Japanese Utility Model Publication No. 61-43110) Problems to be Solved by the Invention However, in the above-mentioned configuration, (1) When the refrigerant heating amount changes in the refrigerant heater 1, the opening / closing valve 4 is operated when the heating amount is small. When the opening / closing time is set and the heating amount is increased, the refrigerant circulation amount in the refrigerant heater 1 becomes insufficient and the refrigerant heater 1
Temperature rises abnormally, and the thermal stability of the refrigerant is impaired.

(2) If the opening / closing time of the on-off valve 4 is set when the heating amount is large and the heating amount is reduced in this state, the amount of refrigerant flowing from the refrigerant heater 1 to the radiator 6 and the liquid receiver 2 When the on-off valve 4 is closed, the amount of the condensate refrigerant flowing in is out of balance and the cycle pressure hunts, resulting in poor stability.

(3) Even if the opening / closing time of the on-off valve is set according to the amount of combustion, if the opening / closing time is changed at the same timing as the amount of combustion when switching from large to small, the refrigerant distributed to the radiator The amount remains and the cycle pressure increases.

There were problems such as.

The present invention solves the above conventional problems, and prevents thermal decomposition due to abnormal heating of the refrigerant in the refrigerant heater and improves cycle stability even when the heating amount of the refrigerant heater changes. To aim.

Means for Solving the Problems In order to solve the above problems, the heating device of the present invention is arranged such that a refrigerant heater for heating a refrigerant by a burner is disposed below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are arranged. The refrigerant heater inlet pipe and the outlet pipe are connected to form a loop, while the liquid receiver is disposed above the gas-liquid separator and the radiator, the first check valve, the liquid receiver, A second check valve is connected to the gas-liquid separator, and a pressure equalizing pipe having an opening / closing valve is provided between the liquid receiver and the refrigerant heater outlet pipe. The opening / closing valve has a large burner burn amount. When the burner combustion amount is short, the open / close operation period is lengthened when the burner combustion amount is small, and when the burner combustion amount is switched from large to small, the burner combustion amount is maintained for a certain period even if the combustion amount is switched. With a control device that changes the opening / closing valve cycle after operating at the opening / closing cycle when the Is.

Action In the present invention, the required refrigerant circulation amount G (g / sec) in which the refrigerant is not abnormally heated by the refrigerant heater is G = V when the cycle of the opening / closing time (opening time T ₀ + closing time T ₁ ) is T. × γ / T (V: receiver volume (cc) γ: liquid refrigerant density in receiver (g / cc)). When the burner combustion amount increases, the cycle T is shortened and G is increased. , When the burner combustion amount becomes small, the cycle T
To prevent G from abnormally heating the refrigerant in the refrigerant heater for each burner combustion amount, and for each burner combustion amount, the amount of refrigerant condensed from being pumped from the refrigerant heater to the radiator. It balances the amount of condensed liquid refrigerant flowing from the radiator to the liquid receiver, and acts to prevent hunting of the cycle pressure. Also, when the burner combustion amount is switched from large to small, the refrigerant of the radiator was returned to the receiver in a short cycle of the open / close valve for a certain period of time. By prolonging the period of the rear opening / closing valve, the cycle pressure is prevented from increasing due to continuing the operation after switching the combustion amount in the state where the refrigerant distribution in the radiator is large.

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, reference numeral 1 denotes a refrigerant heater arranged below the gas-liquid separator 3 and connected to the refrigerant heater inlet pipe 7, the refrigerant heating outlet pipe 8 and the gas-liquid separator 3 in a loop shape, 2 Is a liquid receiver 6 disposed above the gas-liquid separator via the second check valve 5.
Is a radiator, 9 is a first check valve, and has a natural circulation circuit of 1,8,3,7 and a refrigerant circulation circuit of 3,6,9,2,5. A pressure equalizing pipe 10 having an opening / closing valve 4 is arranged between the refrigerant heater outlet pipe 8 and the refrigerant heater outlet pipe 2. Further, 11 is a burner heated by the refrigerant heater 1, 12 is the opening / closing time of the on-off valve 4 according to the burner combustion amount, and when the burner combustion amount is switched from large to small,
Delay a certain time from the burner combustion amount switching timing,
It is a control device that sets the open / close valve open / close time to a set value with a small combustion amount.

In the above configuration, the refrigerant heated by the refrigerant heater 1 by the combustion heat of the burner 11 flows into the gas-liquid separator 3 through the refrigerant heater outlet pipe 8 in a two-phase state, and the liquid refrigerant is again in the refrigerant heater inlet pipe. It flows into the refrigerant heater 1 through 7. On the other hand, gas-liquid separator 3
The gas refrigerant of the two-phase refrigerant flowing in from the refrigerant heater 1 is condensed and liquefied by the radiator 6. At this time, when the open / close valve 4 is closed, the second
In the closed state of the check valve 5, the condensed liquid refrigerant from the radiator 6 is pressure-fed to the liquid receiver 2 through the first check valve 9, and the radiator 6 is placed inside the liquid receiver 2.
Filled with condensate from. When the opening / closing 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 enters the gas-liquid separator 3. Inflow. At this time, the first check valve 9 is closed. Next, when the on-off valve 4 is closed, the second check valve 5 is closed and the condensed liquid refrigerant is pressure-fed to the liquid receiver 2 from the radiator 6 again to fill the liquid receiver 2 with the condensed liquid refrigerant and open the open / close valve 4. The cycle of doing is repeated. 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.

Here, if the combustion amount of the burner 11 is changed from small to large, the control device 12
As a result, the opening / closing operation cycle of the on-off valve 4 becomes short, the amount of liquid refrigerant supplied from the liquid receiver 2 to the gas-liquid separator 3 per unit time increases, and the refrigerant heater 1 is prevented from running out of refrigerant to prevent refrigerant heating. It is possible to prevent abnormal heating of the refrigerant in the container 1. or,
When changing the combustion amount of the burner 11 from a large amount to a small amount, the control device 12 switches the combustion amount to operate for a while with the opening / closing time of the opening / closing valve 4 having a large combustion amount, and then the cycle of the opening / closing valve 4 is lengthened. By doing so, it is possible to prevent the cycle pressure from increasing due to continuing the operation after switching the combustion amount while keeping the refrigerant distribution in the radiator large, and to prevent the refrigerant amount sent from the gas-liquid separator 3 to the radiator 6 and the refrigerant amount received from the radiator 6. The amount of condensed liquid refrigerant flowing into the liquid container 2 can be balanced, hunting of cycle pressure can be prevented, and stable heating operation can be performed.

When changing the opening / closing cycle of the on-off valve 4, the time for supplying the condensed liquid refrigerant from the liquid receiver 2 to the gas-liquid separator 3, that is, the time for which the on-off valve 4 is open is constant regardless of the combustion amount of the burner 11. Alternatively, the opening / closing time period of the opening / closing valve 4 may be changed by changing the time for which the amount of the condensed liquid refrigerant of the radiator 6 accumulates in the liquid receiver 2, that is, the closing time of the opening / closing valve 4.

As described above, according to the heating device of the present invention, when the cycle of the on-off valve is changed according to the combustion amount of the burner that heats the refrigerant in the refrigerant heater, and when the combustion amount changes from large to small. Since there is a control device that continues the operation with a large combustion amount for a certain period after switching the combustion amount and then changes the combustion amount to a small combustion period, regardless of the burner combustion amount, there is an abnormality in the refrigerant in the refrigerant heater. There is an effect that heating can be prevented and an abnormal pressure rise and hunting in the cycle can be prevented and a highly reliable heating device can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a heating device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of a conventional heating device. 1 ... Refrigerant heater, 2 ... Liquid receiver, 3 ... Gas-liquid separator,
4 ... on-off valve, 5 ... second check valve, 6 ... radiator, 9 ...
… First check valve, 10 …… equalizing pipe, 11 …… burner, 12 …… control device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Jakudo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koichiro Yamaguchi, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A refrigerant heater for heating a refrigerant by a burner is disposed below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are looped by a refrigerant heater inlet pipe and an outlet pipe. While connecting pipes, the liquid receiver is disposed above the gas-liquid separator, and the radiator, the first check valve, the liquid receiver, the second check valve, and the gas-liquid separator are connected pipes. A pressure equalizing pipe having an open / close valve is provided between the liquid receiver and the refrigerant heater outlet pipe, and the open / close valve has a short open / close operation cycle when the burner combustion amount is large, and the burner combustion amount is small. When the burner combustion amount is switched from large to small, the open / close valve cycle after operating at the open / close operation period when the burner combustion amount is large A heating device equipped with a changing control device. 2. A control device that operates so that the opening / closing valve has a constant opening time regardless of the burner combustion amount and the closing time is short when the burner combustion amount is large and the closing time is long when the burner combustion amount is small. The heating device according to claim 1, wherein the heating device is provided.