JPH0670495B2 - 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 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. (For example,
Further, it has been proposed that the on-off valve 4 is configured to be opened and closed appropriately at a predetermined time interval. (For example, Japanese Utility Model Publication No. 61-43110) Problems to be Solved by the Invention However, in the above configuration, 1) when the refrigerant heating amount of the refrigerant heater 1 changes, 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, the temperature of the refrigerant heater 1 rises abnormally, and the thermal stability of the refrigerant is impaired.

2) Also, set the open / close time of the open / close valve 4 when the heating amount is large,
If the heating amount is made small in this state, the balance between the amount of the refrigerant flowing from the refrigerant heater 1 to the radiator 6 and the amount of the condensed liquid refrigerant flowing into the liquid receiver 2 when the on-off valve 4 is closed breaks the cycle pressure. Causes hunting and lacks stability.

There were problems such as.

The present invention is intended to solve such conventional problems and to prevent thermal decomposition due to abnormal heating of the refrigerant in the refrigerant heater and improve cycle stability even when the heating amount of the refrigerant heater changes. To do.

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 arranged below a gas-liquid separator, and the refrigerant heater and the gas-liquid are arranged. While connecting the separator to the loop in a loop, the liquid receiver is disposed above the gas-liquid separator and the radiator, the first check valve, the liquid receiver, the second check valve, the gas-liquid A pressure equalizing tube having an opening / closing valve is provided between the gas-liquid separator and the liquid receiver while connecting a separator, and the opening / closing valve has a short opening / closing cycle when the burner has a large combustion amount,
When the burner has a small combustion amount, the control device is provided so as to extend the opening / closing cycle.

Action The present invention has the above-described configuration, and when the required refrigerant circulation amount G (g / sec) in which the refrigerant is not abnormally heated by the refrigerant heater is the cycle of the on-off valve (open time T ₀ + close time T ₁ ) is T, G = It is expressed by V × γ / T (V: receiver volume (cc), γ: condensate refrigerant density in receiver, g / cc). When the burner combustion amount increases, the cycle T is shortened and G is increased. As the burner combustion amount decreases, the cycle T is lengthened and G is reduced to prevent abnormal heating of the refrigerant in the refrigerant heater for each burner combustion amount, and for each burner combustion amount The balance between the amount of the refrigerant that is pumped to the radiator and condensed and the amount of the condensed liquid refrigerant that flows into the liquid receiver at the radiator serves to prevent hunting of the cycle pressure.

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, 9 is a first check valve, and 2 is a gas The liquid receivers 5 arranged above the liquid separator 3 are second check valves, 3, 7, 6, 8,
Reference numerals 9, 2, 5 constitute a refrigerant circulation circuit, and a pressure equalizing pipe 10 having an opening / closing valve 4 is arranged between the liquid receiver 2 and the gas-liquid separator 3. Further, 11 is a burner for heating the refrigerant heater 1,
Reference numeral 12 is a control device for controlling the opening / closing time of the opening / closing valve 4 according to the combustion amount of the burner.

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 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 opening / closing valve 4 is closed, the second check valve 5 is closed, and the condensed liquid refrigerant from the radiator 6 is pressure-fed to the liquid receiver 2 through the first check valve 9 and the inside of the liquid receiver 2 is closed. It is filled with the condensate from the radiator 6. 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 from the radiator 6 to the liquid receiver 2 again, the liquid receiver 2 is filled with the condensed liquid refrigerant, and the opening / closing valve 4 is opened. 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. If the combustion amount of the burner 11 is increased from small to large, the control device 12 shortens the opening / closing operation cycle of the on-off valve 4 and the liquid refrigerant supply amount from the liquid receiver 2 to the gas-liquid separator 3 per unit time increases. It is possible to prevent the refrigerant heater 1 from running out of refrigerant and prevent abnormal heating of the refrigerant in the refrigerant heater 1. Further, when the combustion amount of the burner 11 is changed from large to small, the opening / closing operation cycle of the on-off valve 4 is lengthened by the control device 12, and the amount of refrigerant sent from the gas-liquid separator 3 to the radiator 6 and the radiator 6 to the receiver 2 The amount of condensate refrigerant flowing into the chamber can be balanced, hunting of cycle pressure can be prevented, and stable heating operation can be performed. In addition, the time for supplying the condensed liquid refrigerant from the liquid receiver 2 to the gas-liquid separator 3 when changing the open / close operation cycle of the open / close valve 4, that is, the open time of the open / close valve 4 is constant regardless of the combustion amount of the burner 11, The open / close time period of the open / close 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 close time of the open / close valve 4.

As described above, according to the heating device of the present invention, the cycle of the on-off valve according to the combustion amount of the burner that heats the refrigerant in the refrigerant heater is short when the burner combustion amount is large, and the burner combustion amount is Since a control device is provided to control it to be long when it is small, regardless of the amount of combustion, it is possible to prevent abnormal heating of the refrigerant in the refrigerant heater and prevent hunting of the cycle pressure, thus providing a highly reliable heating device. effective.

[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 Takashi Sawada 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Kunihiro Suga, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Junichi Jundo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Masahiro Obama 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A refrigerant heater for heating a refrigerant with a burner is disposed below the gas-liquid separator, and the refrigerant heater and the gas-liquid separator are connected and connected in a loop shape while the liquid receiver is connected to the liquid receiver. The radiator, the first check valve, the liquid receiver, the second check valve, and the gas-liquid separator are arranged above the gas-liquid separator and are connected to the gas-liquid separator and the liquid-liquid separator and the liquid receiver. A pressure equalizing pipe having an opening / closing valve is provided between the control valve and the opening / closing valve so that the opening / closing operation cycle is short when the burner combustion amount is large and the opening / closing operation cycle is long when the burner combustion amount is small. A heating device equipped with a 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.