JP3330681B2 - Non-condensable gas fully automatic exhaust system for absorption chiller / heater / refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-condensable gas fully automatic discharge device capable of automatically discharging non-condensable gas without limitation in any operation mode in an absorption chiller / heater or an absorption refrigerator.

[0002]

2. Description of the Related Art A conventional non-condensable gas discharge device is configured to automatically store non-condensable gas in a collection chamber, artificially measure the pressure, and manually exhaust the pressure by an extraction pump. Things were the main.

In Japanese Patent Publication No. 61-25993, an uncondensable gas is introduced into a bleed chamber, and when a predetermined amount of the noncondensable gas is accumulated, a pressure detector detects this pressure and operates to exhaust the gas. A bleed device for operating a pump is described.

Further, Japanese Patent Publication No. 3-62987 discloses that
The non-condensable gas in the absorption refrigerator is bleed into the bleed chamber through the bleed path together with the refrigerant vapor, and the bleed refrigerant vapor is separated into the non-condensable gas while being absorbed by the absorbent, and the non-condensable gas is stored in the collection chamber. In a non-condensable gas discharge device that discharges non-condensable gas in the collection chamber to the outside of the apparatus by an exhaust pump via a discharge path, a pressure detector that detects a pressure in the collection chamber, and a signal from the pressure detector are input. A non-condensable gas discharge device for an absorption refrigerator including an arithmetic device for calculating the rate of increase in pressure and an alarm device for issuing a warning to a user based on a signal from the arithmetic device.

[0005]

In the above-mentioned conventional apparatus, the following problems occur, and the use of any of them is limited.
That is, automatic exhaust was possible only in the cooling operation mode, but was not possible in the heating operation mode. (1) When the temperature of the cooling water becomes higher than the specified value, the bleeding pump sucks the absorbing liquid together with the non-condensable gas, and the body is caused by reverse leakage of the non-condensable gas (air) due to breakage of the pump or reduction of the ultimate vacuum of the pump. Causes a corrosion accident in the interior. (2) Even if there is a large amount of non-condensable gas generated due to the leakage of air into the body or the decrease of the corrosion inhibitor (inhibitor) due to the occurrence of corrosion in the piping system, etc., the bleeding pump sucks the absorbing liquid. And the same accidents as in the preceding paragraph will occur.

(3) When the cooling load becomes abnormally high and the chilled water temperature rises above a predetermined value, the same accident as in (1) occurs. (4) While the chiller / heater is operating in the heating operation mode, the pressure balance between the ultimate vacuum degree of the extraction pump, the pressure in the collector, and the pressure of the non-condensable gas introduction portion in the body is out of a predetermined range,
The bleeding pump sucks the absorbing liquid, causing the same accident as in (1). (5) Although the automatic exhaust in the heating operation mode could not be performed for the reason of the above item (4), the operation was not hindered, and thus the non-condensable gas was not exhausted. As a result, vacuum management of the absorption chiller / heater is not performed, and it was conventionally impossible to prevent an accident due to progress of corrosion in the body due to leakage of air.

The present invention has been made in view of the above-mentioned problems, and solves the above-mentioned conventional problems. Further, the present invention is capable of automatically discharging non-condensable gas without any limitation in any operation mode. The purpose is to provide.

[0008]

In order to achieve the above object, a fully automatic non-condensable gas discharge device for an absorption chiller / heater / refrigerator according to the present invention, as shown in FIG. The non-condensable gas in the absorber 10 of the refrigerator is extracted into the extraction chamber 12 together with the refrigerant vapor, and the extracted refrigerant vapor is absorbed into the absorbing liquid and decomposed into the non-condensable gas to collect the non-condensable gas into the collection chamber 14.
In the non-condensable gas automatic discharge device, in which the non-condensable gas in the collection chamber is exhausted to the outside by operating the extraction pump 16 manually in a timely manner. , A pressure sensor Ps for detecting the pressure in the collection chamber 14,
Temperature sensor Tl for detecting the temperature in the inside, temperature sensor Ts for detecting the temperature of the cold water or hot water in the cold water outlet pipe or hot water outlet pipe 22 connected to the evaporator 20, and the pressure sensor P
s, a temperature sensor Tl, and a computing unit 24 for inputting signals from the temperature sensor Ts, and the signal from the computing unit 24 automatically operates the bleeding pump 16.

The problem to be solved in the present invention is to prevent the bleeding pump from sucking the absorbing liquid when automatically discharging the non-condensable gas, as described above. For this reason,
The present inventor has found that when the following relationship is established, the condition that the extraction pump does not suck the absorption liquid is understood, and the extraction pump does not suck the absorption liquid.

Pp ≦ Pt−Pd where Pp: degree of vacuum reached by the extraction pump Pt: storage pressure of the collection chamber Pd: pressure of the non-condensable gas inlet (inside cylinder pressure)

Here, since it is known that the pressure of the non-condensable gas introduction port (in-body pressure) Pd follows a certain transition in the operation mode and the operation conditions, setting these conditions makes it possible to perform the operation in any operation mode. Non-condensable gas can be automatically discharged without restriction.

Therefore, the determination of the operation mode is made in the operation mode of the machine in addition to providing the temperature sensor Ts on the cold water outlet pipe or the hot water outlet pipe 22. Further, the pressure Pd of the non-condensable gas inlet is provided by providing a temperature sensor Tl in the absorber 10 and noting that the pressure and the temperature are always in a proportional relationship.
It became possible to detect. Further, a temperature sensor Ts of the cold water outlet pipe or the hot water outlet pipe 22 is also used to correct the detection of the temperature sensor Tl. As a result, the non-condensable gas inlet pressure Pd is calculated by the calculator using the temperature sensors Tl and Ts, and the pressure sensor Ps provided in the collection chamber 14 is provided under the condition that the above-described bleeding pump does not suck the absorbing liquid. By operating the extraction pump 16, the non-condensable gas can be automatically exhausted under all conditions.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. However, the shapes of the components described in this embodiment, the relative arrangement thereof, and the like are not intended to limit the scope of the present invention to them only, unless otherwise specified, and are merely illustrative examples. It's just FIG. 1 shows an example of an absorption chiller / heater provided with a fully automatic noncondensable gas discharge device of the present invention. 10 is an absorber and 20 is an evaporator, which is provided in the same body. The non-condensable gas in the absorber 10 is introduced into the bleed chamber 12 through the bleed pipe 26 together with the refrigerant vapor.

A part of the absorption liquid in the absorber 10 is supplied to the bleed chamber 12 through the absorption liquid pipe 30 by the absorption liquid pump 28, and the non-condensable gas is absorbed together with the absorption liquid by the ejector action of the absorption liquid. Gas-liquid separator 1 through condensing gas pipe 32
8 is introduced. At this time, the refrigerant vapor is absorbed by the absorbing liquid. The absorption liquid separated by the gas-liquid separator 18 is circulated to the absorber 10 through the absorption liquid pipe 34, while the non-condensable gas is guided to the collection chamber 14 through the non-condensable gas pipe 36. The bleeding chamber 12 and the collection chamber 14 are partitioned by a partition member 38, and the two chambers 12 and 14 constitute an automatic bleeding device 40. Note that the bleeding chamber and the collection chamber may be provided separately.

The collection chamber 14 is connected to the bleed pump 16 via a bleed pipe 46 provided with bleed solenoid valves 42 and 44. The collection chamber 14 is provided with a pressure sensor Ps for detecting the pressure in the collection chamber. The absorber 10 is provided with a temperature sensor Tl for detecting the temperature in the absorber.
0 is connected to a cold water outlet pipe or a hot water outlet pipe 22, a temperature sensor Ts for detecting a cold water outlet temperature or a hot water outlet temperature.
Is provided.

Signals from the pressure sensor Ps, the temperature sensor Tl, and the temperature sensor Ts are input to a calculator 24, and the signal from the calculator causes the bleeding pump 16 to operate. 48 is an electric motor, 50 is a refrigerant pump, 5
2 is a condenser, 54 is a low temperature regenerator, 56 is a cooling / heating switching valve, 5
8 is a heat exchanger, 60 is a high temperature regenerator, 62 is a burner, 64
Is an absorption liquid pump, 66 is a heat recovery unit, and 68 is a gas-liquid separator.

When the non-condensable gas is automatically exhausted in the heating operation mode, the temperature of the temperature sensor Tl at the non-condensable gas inlet is set to 40 ° C. or less, and the hot water temperature sensor Ts simultaneously satisfies this condition. Make sure that This condition is mainly satisfied during the stop of the heating operation or at the start of the operation. However, in the case of the low-load operation, the operation can be performed immediately after the stop of the operation. Under this condition, the collection chamber 14 is automatically operated during operation.
If the non-condensable gas stored in the tank reaches a predetermined pressure of 90 mmHg, the gas is automatically exhausted when the above condition is reached, and if the predetermined exhaust completion pressure becomes 50 mmHg or less, the automatic exhaust is completed. .

Under the above conditions, if the pressure of the pressure sensor Ps is 90 mmHgA or more, the non-condensable gas is automatically exhausted. If the pressure of the pressure sensor Ps becomes 50 mmHgA or less,
Complete automatic evacuation. The value of 90 mmHgA is a pressure at which the non-condensable gas inlet pressure (inside pressure) Pd and the storage pressure Pt of the collecting chamber have been confirmed to always maintain the U seal in all operation modes, and the expression Pt ≦ Pd + 90 is established. The value of 50 mmHgA is the pressure of the non-condensable gas inlet (body pressure) Pd and the storage pressure P of the collection chamber.
It suffices if it can be confirmed that t is an in-body pressure that does not affect performance in all operation modes. Therefore, the above Pt ≦
If Pd + 90 is established, the U-seal will not be broken and the inside of the body can be maintained in an optimal state. Therefore, an appropriate pressure of 80 mmHg at which the bleeding pump does not hunt will be determined.

[0019]

As described above, the present invention has the following effects. (1) In both the cooling operation mode and the heating operation mode, the non-condensable gas can be automatically discharged.

[Brief description of the drawings]

FIG. 1 is equipped with a fully automatic non-condensable gas discharge device of the present invention.
It is a systematic explanatory drawing showing an example of an absorption chiller / heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Absorber 12 Extraction chamber 14 Collection chamber 16 Extraction pump 18 Gas-liquid separator 20 Evaporator 22 Cold water outlet pipe or hot water outlet pipe 24 Computing device Ps Pressure sensor Tl Temperature sensor Ts Temperature sensor

────────────────────────────────────────────────── ─── Continuation of the front page Examiner Eiji Shoji (56) References JP-A-1-234767 (JP, A) JP-A-63-21459 (JP, A) JP-B 3-62987 (JP, B2) JP-A-61-25993 (JP, B1) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 43/04

Claims (1)

(57) [Claims] An absorber for an absorption chiller / heater / refrigerator (10)
The non-condensable gas inside is extracted into the bleed chamber (12) together with the refrigerant vapor, and the extracted refrigerant vapor is separated from the non-condensable gas while being absorbed by the absorbing liquid, and the non-condensable gas is stored in the collection chamber (14). In an automatic non-condensable gas discharge device in which non-condensable gas in the collection chamber is exhausted to the outside by operating the bleeding pump (16) in a timely manner, an absorbent and a non-condensable gas that have absorbed refrigerant vapor are used. Gas-liquid separator (18) for separating pressure, and a pressure sensor (Ps) for detecting the pressure in the collection chamber (14)
And a temperature sensor (Tl) for detecting the temperature in the absorber (10).
A temperature sensor (Ts) for detecting the temperature of cold water or hot water in the cold water outlet pipe or the hot water outlet pipe (22) connected to the evaporator (20); a pressure sensor (Ps); a temperature sensor (Tl); An arithmetic unit (24) for inputting a signal from the temperature sensor (Ts), wherein the bleeding pump (16) is automatically operated by a signal from the arithmetic unit (24). Fully automatic discharge device for non-condensable gas in chiller / heater and refrigerator.