JP3384111B2 - Absorption refrigerator - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorption type refrigerator in which a highly corrosive solution such as an aqueous solution of lithium bromide which absorbs a refrigerant such as water is enclosed in a system.

[0002]

2. Description of the Related Art Conventionally, an extremely small amount of oxygen mixed in the system causes corrosion on the inner surfaces of various devices and pipes, and this corrosion produces hydrogen gas in the system, which accumulates and reduces the refrigerating capacity. Therefore, this hydrogen gas is discharged to the outside of the system, that is, to the atmosphere.

As this type, Japanese Patent Laid-Open No. 2-2752 is known.
No. 62 publication is known, and as shown in FIG. 5, an exhaust pipe extending from the inside of an absorber D is provided with a bleed device C having a gas-liquid separator A and a purge tank B. E
A branch pipe G branched from the downstream side of the solution pump F is connected via an ejector H, and a confluent pipe J is opened to a gas-liquid separator A, and the separated absorption liquid is passed to a absorber D via a return pipe K. The hydrogen gas is returned to the atmosphere through the purge tank B and the palladium cell L.

A trap T is connected to the purge tank B via a pipe M and a valve N, and a hydrogen concentration detector S composed of an ultrasonic gas concentration detector is inserted inside the trap T. And during regular maintenance,
The amount of hydrogen gas generated in the system is measured by the hydrogen concentration detector S to grasp the degree of corrosion, and the residual amount of the corrosion inhibitor consumed by forming a film on the corroded portion by adding it to the solution in advance is calculated. When it is determined that the corrosion inhibitor is insufficient, a control such as additionally filling the system with a new corrosion inhibitor can be performed.

[0005]

However, in the above, in detecting hydrogen gas, the trap T is purposely provided through the pipe M and the valve N, so that the hydrogen gas detecting structure is complicated and The hydrogen concentration detector S, which is an ultrasonic gas concentration detector, is inserted inside the trap T to detect hydrogen gas in the system, so that a portion penetrating the inside and outside of the system is formed and There is also a problem that it is difficult to maintain a completely sealed state, and an extremely small amount of air may invade from the sealed portion or the like to increase corrosion.

In the present invention, by detecting hydrogen gas generated in the system outside the system, an absorption refrigerator having a simple structure and capable of detecting hydrogen gas while maintaining a good sealed state in the system. The main purpose is to provide.

[0007]

In order to achieve the above main object, the invention according to claim 1 is, as shown in FIG. 2, an evaporator 1, an absorber 2, generators 3, 4 and a condenser. Bowl 5
As shown in FIG. 1, in an absorption refrigerating machine in which hydrogen gas generated in the system is discharged to the atmosphere via the palladium cell 101, in an atmosphere located on the outlet side of the palladium cell 101, A hydrogen gas detecting means 8 for detecting the discharged hydrogen gas is provided.

The invention according to claim 2 is, in the invention according to claim 1, in order to improve the detection accuracy of hydrogen gas, a ventilation tube 104 having a blower fan 105 arranged on the cross section of the passage on the outlet side of the palladium cell 101. This ventilation tube 10 is provided with
The hydrogen gas detection means 8 was disposed on the secondary side of the blower fan 105 in the No. 4 air conditioner.

According to the invention of claim 3, in each of the inventions of claim 1 or 2, the deterioration of the palladium cell 101 due to permeation of hydrogen gas can be detected.
The pressure detecting means 92c for detecting the pressure on the inlet side of the palladium cell 101 is provided, and the rising rate of the internal pressure detected by the pressure detecting means 92c is higher than a predetermined rate with respect to the discharge rate of hydrogen gas detected by the hydrogen gas detecting means 8. When it is large, the deterioration determining means 108 for determining that the palladium cell 101 is abnormal is provided.

According to the invention of claim 4, in the invention of claim 3, in order to know the replacement time of the palladium cell 101, when the deterioration judging means 108 judges an abnormality, an alarm is issued. Means 109 were provided.

[0011]

According to the first aspect of the invention, the hydrogen gas generated in the system passes through the palladium cell 101 and is discharged to the atmosphere outside the system, and the hydrogen gas discharged to the atmosphere is discharged from the outlet of the palladium cell 101. The hydrogen gas generated in the system can be detected by the hydrogen gas detecting means 8 provided on the side. Thus, since the hydrogen gas detecting means 8 is provided on the atmosphere side, the structure is simple, and moreover, the portion penetrating the inside and outside of the system can be eliminated, and the hermetically sealed state in the system can be maintained.

According to the second aspect of the present invention, since the amount of passing gas per unit time inside the ventilation tube 104 is substantially constant by the forced air blowing by the ventilation fan 105, the secondary of the ventilation fan 105 in the ventilation tube 104 is secondary. By disposing the hydrogen gas detecting means 8 on the side, the accuracy of detecting hydrogen gas can be improved.

According to the third aspect of the present invention, when the palladium cell 101 deteriorates along with the permeation of hydrogen gas, the permeation power of hydrogen gas decreases and the hydrogen gas cannot be discharged smoothly. Therefore, on the outlet side of the palladium cell 101, the rate of increase of the internal pressure detected by the pressure detecting means 92c on the inlet side becomes higher than a predetermined rate with respect to the discharge rate of hydrogen gas detected by the hydrogen gas detecting means 8. .
Then, by determining this by the deterioration determining means 108, it is possible to determine the abnormality of the palladium cell 101.

According to a fourth aspect of the invention, the deterioration determining means 10 is provided.
When the abnormality is determined in 8, an alarm is issued from the alarm means 109, so that the replacement time of the palladium cell 101 can be known.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The absorption refrigerator shown in FIG. 4 has an evaporator 1 for spraying a refrigerant liquid and a refrigerant pump 13, and an evaporator 1 for evaporating the refrigerant to take out cold water for cooling to a cold water pipe 11, and the evaporator. 1 is provided adjacent to each other in the same container 20 with an eliminator 21 sandwiched therebetween, and a concentrated solution sprayer 22 and a cooling water pipe 2 are provided.
3, an absorber 2 for absorbing the refrigerant evaporated in the evaporator 1 into a solution, the absorber 2 is connected to the solution pump 25, a low temperature heat exchanger 26 and a high temperature heat exchanger 27, and a burner 31 is used. High temperature side generator 3 for generating a refrigerant from a dilute solution in which a large amount of the refrigerant is absorbed by the absorber 2, and the generator 3
The low-temperature generator 4 which has a heater 41 for flowing the refrigerant vapor generated in 1) and which is regenerated by the high-temperature side generator 3 to generate the refrigerant from the intermediate concentration solution after passing through the high-temperature heat exchanger 27.
And provided in the same container 50 as the low temperature side generator 4,
The condenser 2 is provided with a condenser 5 for condensing the refrigerant vapor generated in each of the generators 3 and 4 by a cooling water pipe 24 continuously provided after the cooling water pipe 23 of the absorber 2.

Further, there is provided a bleeding device 90 in which a gas-liquid separator 91 and a purge tank 92 are connected by a pipe 93, and an exhaust pipe 94 extending from the inside of the absorber 2 is connected to the solution pump 25.
Is connected to the branch pipe 95a of the branch pipe 95 branching from the downstream side of the pipe via the ejector 96a, and the joining pipe 96b is opened to the gas-liquid separator 91, and the evaporator 1 and the condenser 5 are connected.
The exhaust pipes 97a and 97b extending from the inside of the pipe are integrated and connected to each other via the branch pipe 95b of the branch pipe 95 and the ejector 98a, and the joining pipe 98b is opened to the gas-liquid separator 91. The absorption liquid separated by the gas-liquid separator 91 is returned to the absorber 2 via the return pipe 99, and the hydrogen gas is released from the palladium cell portion 100 to the atmosphere through the pipe 93, the purge tank 92 and the connecting pipe 92a. There is.
In addition, in FIG. 2, 95c is a heat exchanger which lets cooling water pass.

As shown in FIG. 1, the palladium cell portion 100 is provided with a plate-shaped palladium cell 101 which allows hydrogen gas to pass through and is discharged.
No. 1 is attached to one side opening of a closed chamber 92b connected to the purge tank 92 via a connection pipe 92a. The closed chamber 92b is housed inside main body casings 102 and 103 having a halved structure, and a palladium cell heater 106 composed of an electric heater is fitted in the central portion of the closed chamber 92b. The cell 101 is heated to about 400 ° C.,
The discharge of hydrogen gas from the palladium cell 101 can be promoted.

In the above structure, as shown in FIGS. 1 and 2, hydrogen gas detecting means comprising a hydrogen concentration detector for detecting the concentration of hydrogen gas discharged into the atmosphere located on the outlet side of the palladium cell 101. 8 is provided.

Specifically, on the outlet side of the palladium cell 101, there is provided a ventilation pipe 104 having a rectangular tube shape in which a ventilation fan 105 is arranged in the cross section of the passage, and the ventilation pipe 104 has a secondary side of the ventilation fan 105. The hydrogen gas detection means 8 is provided in the. The blower fan 105 is rotationally driven by a fan motor 107 at a predetermined rotation speed.

Then, the pressure detecting means 92 for detecting the pressure on the inlet side of the palladium cell 101 in the purge tank 92.
c is provided (see FIG. 4), and when the increase rate of the internal pressure detected by the pressure detection means 92c is higher than a predetermined rate with respect to the discharge rate of hydrogen gas detected by the hydrogen gas detection means 8, it is determined that the palladium cell 101 is abnormal. Deterioration determination means 108 for determination
In addition to the above, an alarm unit 109 is provided for issuing an alarm by an alarm buzzer, an alarm lamp, or the like when the deterioration determining unit 108 determines an abnormality.

The deterioration determining means 108 is constituted by using a microcomputer, and performs processing according to the procedure shown in FIG.

First, in step a, the hydrogen gas detecting means 8
The hydrogen concentration is detected by the pressure detecting means 92c, and the pressure in the purge tank 92 is detected by the pressure detecting means 92c in step b.

Then, in step c, the discharge amount of hydrogen gas, that is, the amount of hydrogen gas generated in the system is obtained from the concentration detected by the hydrogen gas detecting means 8, and is sequentially added to the previous amount of hydrogen gas. The discharge rate of the hydrogen gas is calculated from the hydrogen gas amount and the current hydrogen gas amount. The amount of gas passing through the ventilation tube 104 per unit time is determined by the blower fan 105.
Since it is constant by forced air blowing by, the amount of hydrogen gas in the amount of passing gas can be accurately obtained from the detected concentration.

Next, in step d, the pressure detecting means 92c
The pressure rise rate in the purge tank 92 is calculated from the pressure detected by.

Then, in step e, when the rate of pressure increase is greater than a predetermined rate with respect to the discharge rate of hydrogen gas, an alarm is issued from the alarm means 109 by an alarm buzzer or an alarm lamp in step f, and a refrigerator is operated in step g. Stop the operation of.

As a result, the deterioration of the palladium cell 101 can be detected, and by exchanging the palladium cell 101 with a new one, the hydrogen gas can be properly discharged again.

If the integrated amount of hydrogen gas discharged in step c exceeds a predetermined amount, an alarm is also issued by the alarm means 109 from step h to step i, and the refrigerator is operated in step j. Has stopped the operation of. This is because the progress of corrosion in the system is large,
This is because a large amount of hydrogen is generated to prevent an unrecoverable failure.

Further, in the above, as shown in FIG.
A refill tank 6 having a filling valve 61 and a liquid level detector 62 and storing a corrosion inhibitor inside, and an opening / closing valve 7 comprising an electromagnetic valve for supplying the corrosion inhibitor into the system from the tank 6.
1 and a feed pump 7 having a liquid feed pump 72, and an opening / closing valve 71 and a liquid feed pump 72 are operated based on the detection result by the hydrogen gas detection device 8 to automatically feed the corrosion inhibitor from the feed pipe 70 into the system. The control means 9 is provided so that the corrosion inhibitor consumed by the generation of hydrogen gas can be automatically supplied into the system.

[0029]

According to the invention described in claim 1, since the hydrogen gas detecting means 8 is provided in the atmosphere on the outlet side of the palladium cell 101, the structure is simple and the sealed state in the system is kept good. While being able to do so, the hydrogen gas generated in the system can be detected.

According to the second aspect of the invention, the ventilation tube 10
Since the amount of passing gas per unit time inside 4 is almost constant due to forced air blowing by the blower fan 105, by providing the hydrogen gas detecting means 8 on the secondary side of the blower fan 105 in this ventilation tube 104. Therefore, the detection accuracy of hydrogen gas can be improved.

According to the third aspect of the invention, the deterioration determining means 108 can determine the deterioration of the palladium cell 101 due to the permeation of hydrogen gas.

According to the invention described in claim 4, the alarm means 1
From the announcement of 09, it is possible to know when to replace the palladium cell 101.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of an absorption refrigerator according to the present invention.

FIG. 2 is a plan view of relevant parts in FIG.

FIG. 3 is a control flowchart of the same.

FIG. 4 is a piping diagram showing the entire refrigerator.

FIG. 5 is a piping diagram of a conventional example.

[Explanation of symbols]

1; evaporator, 2; absorber, 3, 4; generator, 5; condenser, 8; hydrogen gas detecting means, 101; palladium cell,
104; Ventilation tube, 105; Blower fan, 92c; Pressure detecting means, 108; Degradation judging means, 109; Warning means

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-1058 (JP, A) JP-A-6-288890 (JP, A) JP-A-3-51681 (JP, A) JP-A-5- 87421 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 49/04 F25B 43/04 F25B 15/06 F25B 15/00 306

Claims (4)

(57) [Claims] 1. An evaporator (1), an absorber (2), a generator (3, 4), and a condenser (5) are provided, and hydrogen gas generated in the system is passed through a palladium cell (101). An absorption refrigerator that discharges to the atmosphere is characterized in that hydrogen gas detection means (8) for detecting hydrogen gas to be discharged is provided in the atmosphere located on the outlet side of the palladium cell (101). Absorption refrigerator. 2. The outlet side of the palladium cell (101),
A ventilation tube (104) in which a ventilation fan (105) is arranged is provided in the cross section of the passage, and a hydrogen gas detection means (8) is disposed on the secondary side of the ventilation fan (105) in the ventilation tube (104). The absorption refrigerator according to claim 1. 3. A pressure detection means (92c) for detecting the pressure on the inlet side of the palladium cell (101) is provided, and the discharge rate of hydrogen gas detected by the hydrogen gas detection means (8) is
The absorption according to claim 1 or claim 2, further comprising deterioration determining means (108) for determining that the palladium cell (101) is abnormal when the rising speed of the internal pressure detected by the pressure detecting means (92c) is higher than a predetermined value. Refrigerator. 4. The absorption refrigerator according to claim 3, further comprising alarm means (109) for issuing an alarm when the deterioration determining means (108) determines an abnormality.