JP5646385B2 - Absorption refrigerator - Google Patents

Description

  The present invention relates to an absorption refrigerator that branches a rare absorbent from an absorber into a high-temperature regenerator and a low-temperature regenerator.

  2. Description of the Related Art Conventionally, absorption refrigerating machines that include a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, which are connected to each other by piping to form a circulation path for absorption liquid and refrigerant, are known (for example, , See Patent Document 1). In this absorption refrigerator, a diluted absorbent (hereinafter referred to as a rare absorbent) in which the refrigerant is absorbed by the absorbent is branched from the absorber into a high-temperature regenerator and a low-temperature regenerator. For example, by providing a resistance such as an orifice plate in the pipe connected to the pipe, the ratio of the rare absorbent flowing through the high temperature regenerator and the low temperature regenerator is set.

JP 2000-283668 A

However, in the above conventional configuration, since the orifice plate having a fixed resistance is used, the ratio of the rare absorbent distributed to the high-temperature regenerator and the low-temperature regenerator is shifted between the high load of cooling and the low load of cooling. Therefore, COP (Coefficient of Performance) at the time of cooling low load may be reduced. Therefore, in order to adjust the distribution of the absorption liquid to a ratio commensurate with the cooling load, a rare absorption liquid that electrically controls the valve opening degree in one of the pipe connected to the high temperature regenerator and the pipe connected to the low temperature regenerator. It is conceivable to provide a distribution valve (distribution valve).
By the way, in an absorption refrigerator, the absorbing liquid may contain a large amount of foreign matter such as iron due to long-term use or vacuum opening construction. If this foreign matter such as iron enters the rare absorbent dispensing valve, it may cause a failure that triggers the locking of the valve body.Therefore, it is required to maintain the performance by early detection and countermeasures for this failure. Yes. Furthermore, if the rare absorbent distribution valve breaks down, the absorption chiller cannot be operated during the replacement period. Therefore, even if it breaks down, it is required to continue the chiller as soon as possible.
The present invention has been made in view of the above-described circumstances, and provides an absorption refrigerator that can detect a failure that the rare absorption liquid distribution valve locks at an early stage and can continue operation even at the time of the failure. With the goal.

In order to achieve the above object, the present invention includes a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and the rare absorbent in the absorber is used as the high temperature regenerator and the low temperature regenerator. In the absorption chiller that branches and flows into each, a distribution valve that controls the ratio of the rare absorbent flowing through the high temperature regenerator and the low temperature regenerator by adjusting the valve opening and bypassing this distribution valve Based on the bypass valve and an index indicating the operating state, a determination means for determining whether or not the distribution valve tends to lock, and when the distribution valve tends to lock, the bypass valve is opened. e Bei and informing means for informing the prompting, acquires the coefficient of performance during operation as the index, the determination unit, when the deviation between the designed value and the coefficient of performance becomes greater than a predetermined value, the distribution this to determine that there is a tendency that the valve is locked The features.

  According to this configuration, it is determined whether or not the distribution valve has a tendency to lock based on the index indicating the operation state, and when the distribution valve has a tendency to lock, it is notified that the bypass valve is to be opened. Therefore, the failure of the distribution valve can be detected at an early stage, and a quick response to the failure is possible. Furthermore, by opening the bypass valve that bypasses the distribution valve, the operation of the absorption chiller can be continued even if the distribution valve is in a failed state.

The present invention includes a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, and absorbs a dilute absorption liquid in the absorber through the high-temperature regenerator and the low-temperature regenerator. In a type refrigerator, a distribution valve that controls the ratio of a rare absorbent flowing through the high-temperature regenerator and the low-temperature regenerator by adjusting the valve opening, a bypass valve that bypasses the distribution valve, and an operating state are shown. Discrimination means for discriminating whether or not the distribution valve has a tendency to lock based on an index; and notification means for notifying that the bypass valve is to be opened when the distribution valve has a tendency to lock; The absorption liquid concentration in the high temperature regenerator or the absorption liquid concentration in the low temperature regenerator is acquired as the index, and the discriminating means has a deviation between the absorption liquid concentration and a design value from a predetermined value. The distribution valve is Characterized by determining that tend to click.

The present invention also includes a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, and dilutes the rare absorbent in the absorber into the high-temperature regenerator and the low-temperature regenerator, respectively. In the absorption refrigerator that flows, a distribution valve that controls the ratio of a rare absorbent that flows to the high-temperature regenerator and the low-temperature regenerator by adjusting the valve opening, a bypass valve that bypasses the distribution valve, and an operating state And a notification means for instructing the opening of the bypass valve when the distribution valve tends to be locked, based on an index indicating that the distribution valve is likely to lock. Means for obtaining an absorption liquid temperature in the high-temperature regenerator as the index, and the determination means, when the deviation between the absorption liquid temperature and a design value is larger than a predetermined value, Determine that is prone to lock And features.

  Further, the distributing valve rotates a magnetic rotor disposed in a cylindrical valve driving portion fixed to the valve body by a stator, thereby contacting a valve body connected to the rotor with respect to a valve seat. It is configured to adjust the valve opening by separating the valve, and is configured to be attachable to the valve drive unit instead of the stator, and confirms whether the distribution valve is locked by manually rotating the rotor by magnetic force A confirmation jig may be provided.

  The present invention also includes a high-temperature regenerator, a low-temperature regenerator, a condenser, an evaporator, and an absorber, and dilutes the rare absorbent in the absorber into the high-temperature regenerator and the low-temperature regenerator, respectively. In the absorption refrigerator that flows, a first distribution valve that adjusts the valve opening degree to control the ratio of the rare absorbent that flows to the high temperature regenerator and the low temperature regenerator has the same configuration as the first distribution valve. A second distribution valve that bypasses the first distribution valve; a determination unit that determines whether or not the first distribution valve tends to lock based on an index indicating an operating state; and the first distribution valve And a valve opening adjusting means for controlling the valve opening of the second distribution valve when the valve tends to lock.

  According to this configuration, it is determined whether or not the first distribution valve has a tendency to lock based on the index indicating the operation state, and when the first distribution valve has a tendency to lock, the valve of the second distribution valve is determined. Since the opening degree is controlled, the failure of the first distribution valve can be detected at an early stage, and the operation of the absorption chiller can be continued even if the first distribution valve is in a failed state. .

  According to the present invention, it is determined whether or not the distribution valve has a tendency to lock based on the index indicating the operating state, and when the distribution valve has a tendency to lock, it is notified that the bypass valve is to be opened. Therefore, the failure of the distribution valve can be detected at an early stage, and a quick response to the failure is possible. Furthermore, by opening the bypass valve that bypasses the distribution valve, the operation of the absorption chiller can be continued even if the distribution valve is in a failed state.

It is a schematic block diagram of the absorption refrigerator which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows a rare absorption liquid distribution valve. It is a graph which shows the change of the design value of the coefficient of performance with respect to cooling load. It is a figure for demonstrating attachment and operation of the confirmation jig | tool. It is a graph which shows the change of the design concentration of the absorption liquid in the high temperature regenerator and the design concentration of the absorption liquid in the low temperature regenerator with respect to the cooling load. It is a graph which shows the change of the design temperature (design value) of the absorption liquid in the high temperature regenerator with respect to the cooling load. It is a schematic block diagram of the absorption refrigerator which concerns on 4th Embodiment. It is a flowchart which shows the opening degree control operation | movement of a bypass distribution valve.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is a schematic configuration diagram of an absorption refrigerator according to the first embodiment.
The absorption refrigerator 100 is a double-effect absorption refrigerator that uses water as a refrigerant and a lithium bromide (LiBr) aqueous solution as an absorption liquid.
As shown in FIG. 1, the absorption refrigerator 100 includes an evaporator 1, an absorber 2 provided side by side with the evaporator 1, and an evaporator absorber body (which stores the evaporator 1 and the absorber 2). (Lower body) 3, a high-temperature regenerator 5 having a gas burner 4, a low-temperature regenerator 6, a condenser 7 juxtaposed to the low-temperature regenerator 6, and the low-temperature regenerator 6 and the condenser 7 were accommodated. Low temperature regenerator condenser cylinder (upper cylinder) 8, low temperature heat exchanger 12, high temperature heat exchanger 13, refrigerant drain heat recovery unit 16, rare absorption liquid pump P1, concentrated absorption liquid pump P2, and refrigerant A pump P3 is provided, and these devices are connected to each other through absorption liquid pipes 21 to 25, refrigerant pipes 31 to 35, and the like.

  Reference numeral 14 denotes a cold / hot water pipe for circulatingly supplying brine heat exchanged with the refrigerant in the evaporator 1 to a heat load (not shown) (for example, an air conditioner). A heat transfer tube 14 </ b> A formed in the section is arranged in the evaporator 1. On the upstream side and downstream side of the heat transfer tube 14A of the cold / hot water tube 14, temperature sensors 51 and 56 for measuring the inlet temperature and the outlet temperature of the brine flowing through the cold / hot water tube 14 are provided. Further, on the upstream side of the heat transfer tube 14 </ b> A of the cold / hot water tube 14, a flow meter 57 for measuring the flow rate of the brine flowing through the cold / hot water tube 14 is provided. Reference numeral 15 denotes a cooling water pipe for sequentially flowing the cooling water to the absorber 2 and the condenser 7, and the heat transfer pipes 15 </ b> A and 15 </ b> B formed in a part of the cooling water pipe 15 are respectively connected to the absorber 2 and the condenser. 7 is arranged. Reference numeral 50 denotes a control device that controls the entire absorption refrigerator 100, and a buzzer (notification unit) 65 that reports an abnormality when various abnormalities occur is connected to the control device 50. Instead of the buzzer 65 or in addition to the buzzer 65, a lamp may be turned on, or displayed on a screen provided on the operation panel to notify the abnormality.

  The absorber 2 has a function of absorbing the refrigerant vapor evaporated in the evaporator 1 into the absorption liquid and maintaining the pressure in the evaporator absorber body 3 in a high vacuum state. Below the absorber 2 is formed a dilute absorption liquid reservoir 2A in which a dilute absorption liquid diluted by absorbing refrigerant vapor is accumulated. The dilute absorption liquid reservoir 2A is controlled by an inverter 52 so as to be variable in frequency. One end of the rare absorbent pipe 21 provided with the rare absorbent pump P1 is connected. The rare absorbent pipe 21 is branched into a first rare absorbent pipe 21A and a second rare absorbent pipe 21B on the downstream side of the rare absorbent pump P1, and the first rare absorbent pipe 21A is connected to the refrigerant drain heat recovery unit 16. , The second dilute absorption liquid pipe 21 </ b> B joins again after passing through the low temperature heat exchanger 12. Then, the other end of the rare absorbent pipe 21 is branched into a third rare absorbent pipe 21C and a fourth rare absorbent pipe 21D, and the third rare absorbent pipe 21C passes through the high-temperature heat exchanger 13, Opening to the gas layer part 5B located above the heat exchanging part 5A formed in the high temperature regenerator 5, the fourth rare absorbent liquid pipe 21D is connected to the gas layer part 6A formed in the upper part in the low temperature regenerator 6. It is open.

A gas burner 4 including an igniter 4A that ignites fuel such as city gas and a fuel control valve 4B that controls the amount of fuel to change the amount of heat source is accommodated in the lower portion of the high-temperature regenerator 5. When the gas burner 4 receives the combustion signal output from the control device 50, the gas burner 4 burns the gas, and the opening degree of the fuel control valve 4B is determined by the control device 50 according to the temperature measured by the temperature sensor 51 on the cold / hot water outlet side. It is controlled. A fuel flow meter (not shown) that measures the amount of fuel supplied is provided upstream of the fuel control valve 4B. The high-temperature regenerator 5 is formed with a heat exchanging unit 5 </ b> A that heats and regenerates the absorbing liquid using the flame of the gas burner 4 as a heat source above the gas burner 4.
An exhaust path 17 through which exhaust gas combusted by the gas burner 4 circulates is connected to the heat exchanging section 5A, and the heat exchanging section 5A is connected to the side of the heat exchanging section 5A after being regenerated by heating in the heat exchanging section 5A A concentrated absorbent reservoir 5C is formed in which the concentrated absorbent that has flowed out of the portion 5A accumulates. The concentrated absorbent pool 5C is provided with a liquid level sensor 53 for detecting the level of the absorbent stored in the concentrated absorbent pool 5C (in the high temperature regenerator 5). When the liquid level sensor 53 detects a specified high liquid level, the result is output to the control device 50, and the control device 50 is controlled to stop the operation of the rare absorbent pump P1. When the liquid level is lowered to a predetermined value, the operation of the rare absorbent pump P1 is started again.

  One end of the concentrated absorbent liquid pipe 22 is connected to the lower end of the concentrated absorbent pool 5C, and the other end of the concentrated absorbent liquid pipe 22 is an intermediate absorbent that extends from the low temperature regenerator 6 via the high temperature heat exchanger 13. Merge with tube 24. The high temperature heat exchanger 13 heats the absorption liquid flowing through the third rare absorption liquid pipe 21C with the high temperature of the high temperature absorption liquid flowing out from the concentrated absorption liquid reservoir 5C, and the fuel consumption of the gas burner 4 in the high temperature regenerator 5 The amount is reduced. Further, the upstream side of the high-temperature heat exchanger 13 of the concentrated absorbent pipe 22 and the absorber 2 are connected by an absorbent liquid pipe 23 with an on-off valve V1 interposed therebetween.

  The low-temperature regenerator 6 uses the refrigerant vapor separated by the high-temperature regenerator 5 as a heat source to heat and regenerate the absorption liquid stored in the absorption liquid reservoir 6B formed below the gas layer portion 6A. In 6B, a heat transfer tube 31A formed in a part of the refrigerant tube 31 extending from the upper end of the high temperature regenerator 5 to the bottom of the condenser 7 is disposed. By circulating the refrigerant vapor through the refrigerant pipe 31, the heat of the refrigerant vapor is transmitted to the absorption liquid stored in the absorption liquid reservoir 6B via the heat transfer pipe 31A, and the absorption liquid is concentrated. Reference numeral 58 denotes a temperature sensor for measuring the temperature of the absorbing liquid (temperature of the low temperature regenerator) accumulated in the absorbing liquid reservoir 6B of the low temperature regenerator 6, and reference numeral 59 is provided on the downstream side of the heat transfer tube 31A. The temperature sensor measures the refrigerant outlet temperature of the low-temperature regenerator 6.

  One end of an intermediate absorption liquid pipe 24 is connected to the absorption liquid reservoir 6B of the low-temperature regenerator 6, and the other end of the intermediate absorption liquid pipe 24 joins with the concentrated absorption liquid pipe 22 and the concentrated absorption liquid pipe 25. Become. The concentrated absorbent pipe 25 is connected to a concentrated sprayer 2C provided on the upper part of the gas layer 2B of the absorber 2 via the concentrated absorbent pump P2 and the low temperature heat exchanger 12. The low-temperature heat exchanger 12 is a second rare absorption liquid tube with the heat of the concentrated absorbent flowing out from the concentrated absorbent pool 5C of the high-temperature regenerator 5 and the intermediate absorbent flowing out of the absorbent pool 6B of the low-temperature regenerator 6. The rare absorption liquid flowing through 21B is heated. Further, on the upstream side of the concentrated absorbent pump P2, bypass pipes 25A and 25B for bypassing the concentrated absorbent pump P2 and the low-temperature heat exchanger 12 are provided, and the operation of the concentrated absorbent pump P2 is stopped. If so, the concentrated absorbent flowing out from the concentrated absorbent reservoir 5C of the high temperature regenerator 5 and the intermediate absorbent flowing out from the absorbent reservoir 6B of the low temperature regenerator 6 are heated at low temperature through the bypass pipes 25A and 25B. It is supplied into the absorber 2 without going through the exchanger 12.

As described above, the refrigerant liquid reservoir 7A formed at the gas layer portion 5B of the high temperature regenerator 5 and the bottom of the condenser 7 includes the heat transfer pipe 31A and the refrigerant drain piped to the absorption liquid reservoir 6B of the low temperature regenerator 6. The refrigerant pipe 31 is connected via the heat recovery unit 16, and the upstream side of the heat transfer pipe 31A of the refrigerant pipe 31 and the gas layer portion 2B of the absorber 2 are connected by a refrigerant pipe 32 having an on-off valve V2. Further, the refrigerant liquid reservoir 7A of the condenser 7 and the gas layer portion 1A of the evaporator 1 are connected by a refrigerant pipe 33 in which a U seal portion 33A is interposed. The refrigerant pipe 33 is provided with a temperature sensor 60 for measuring the temperature of the refrigerant liquefied by the condenser 7 (condenser outlet temperature).
A refrigerant liquid reservoir 1B in which liquefied refrigerant accumulates is formed below the evaporator 1, and the refrigerant liquid reservoir 1B and the spreader 1C disposed above the gas layer portion 1A of the evaporator 1 are refrigerant pumps P3. The refrigerant pipe 34 is connected. The refrigerant pipe 34 downstream side of the refrigerant pump P3 and the absorbing liquid reservoir 2A of the absorber 2 are connected by a refrigerant pipe 35 having an on-off valve V3 interposed therebetween. The outlet side of the heat transfer pipe 14A of the cold / hot water pipe 14 and the outlet side of the heat transfer pipe 15B of the cooling water pipe 15 are connected by a communication pipe 36 with an on-off valve V4 interposed therebetween.

  The absorption chiller 100 is subjected to a cooling operation in which cold water is taken out from the cold / hot water pipe 14 under the control of the control device 50. During the cooling operation, the evaporator 1 outlet side temperature (temperature measured by the temperature sensor 51) of brine (for example, cold water) circulated and supplied to a heat load (not shown) via the cold / hot water pipe 14 is a predetermined set temperature, For example, the amount of heat input to the absorption refrigeration machine 100 is controlled by the control device 50 so as to be 7 ° C. Specifically, the control device 50 starts all the pumps P1 to P3, burns the gas in the gas burner 4, and the gas burner 4 so that the temperature of the brine measured by the temperature sensor 51 becomes a predetermined 7 ° C. Control the firepower. During the cooling operation, the on-off valves V1 to V4 are closed.

The rare absorbent transported from the absorber 2 to the high temperature regenerator 5 by the rare absorbent pump P1 through the rare absorbent pipe 21 is heated by the flame by the gas burner 4 and the high temperature combustion gas in the high temperature regenerator 5. Therefore, the refrigerant in the rare absorbent is evaporated and separated. The concentrated absorbent whose concentration has been increased by evaporating and separating the refrigerant in the high-temperature regenerator 5 passes through the concentrated absorbent pipe 22 and the concentrated absorbent pump P2 of the concentrated absorbent pipe 25 via the high-temperature heat exchanger 13; It flows into the thick absorption liquid pipe 25.
The rare absorbent transported from the absorber 2 to the low temperature regenerator 6 by the rare absorbent pump P1 through the rare absorbent pipe 21 is supplied from the high temperature regenerator 5 through the refrigerant pipe 31 to the heat transfer pipe 31A. Heated by the flowing high-temperature refrigerant vapor, the refrigerant in the rare absorbent is evaporated and separated. The intermediate absorption liquid whose concentration has been increased by evaporating and separating the refrigerant in the low temperature regenerator 6 flows through the intermediate absorption liquid pipe 24, and joins in the concentrated absorption liquid pipe 25 and the concentrated absorption liquid pipe 25. The merged concentrated absorbent is sent to the absorber 2 via the low-temperature heat exchanger 12 and dispersed from above the concentrated liquid spreader 2C.

On the other hand, the refrigerant separated and generated by the low temperature regenerator 6 enters the condenser 7, condenses, and accumulates in the refrigerant liquid reservoir 7A. When a large amount of refrigerant liquid accumulates in the refrigerant liquid reservoir 7A, the refrigerant liquid flows out of the refrigerant liquid reservoir 7A, enters the evaporator 1 through the refrigerant pipe 33, and passes through the refrigerant pipe 34 by the operation of the refrigerant pump P3. The liquid is pumped and sprayed from the sprayer 1C onto the heat transfer tube 14A of the cold / hot water tube 14.
The refrigerant liquid sprayed on the heat transfer tube 14A evaporates by removing vaporization heat from the brine passing through the inside of the heat transfer tube 14A, so that the brine passing through the inside of the heat transfer tube 14A is cooled, and the brine thus lowered in temperature is A cooling operation such as cooling is performed by supplying the heat load from the cold / hot water pipe 14. Then, the refrigerant evaporated in the evaporator 1 enters the absorber 2, is absorbed by the concentrated absorbent supplied from the high temperature regenerator 5 and the low temperature regenerator 6 and sprayed from above, and is stored in the rare absorbent pool of the absorber 2. The circulation which accumulates in 2A and is conveyed to the high temperature regenerator 5 by the rare absorption liquid pump P1 is repeated. Note that the heat generated when the absorbing liquid absorbs the refrigerant is cooled by the heat transfer pipe 15 </ b> A of the cooling water pipe 15 disposed in the absorber 2.

During the cooling operation of the absorption chiller 100, when the heat load decreases and the amount of heat input to the high temperature regenerator 5 decreases, the pressure in the low temperature regenerator 6 greatly decreases.
Therefore, the amount of the rare absorbent flowing into the low temperature regenerator 6 is larger than that in the high temperature regenerator 5, and the balance of the ratio of the rare absorbent distributed to the high temperature regenerator 5 and the low temperature regenerator 6 is lost. May decrease.
The absorption refrigeration machine 100 according to the present embodiment is an electric valve that is provided in the fourth rare absorption liquid pipe 21D and that changes the ratio of the rare absorption liquid that branches and flows into the high temperature regenerator 5 and the low temperature regenerator 6. A rare absorbent distribution valve 40 is provided.

Further, the absorption refrigerator 100 of the present embodiment includes a temperature sensor 54 that is provided in the high temperature regenerator 5 and detects the temperature of the absorbing liquid in the high temperature regenerator 5 (the temperature of the high temperature regenerator 5), and a cooling water pipe. 15 is provided on the inlet side of the absorber 2 and includes a cooling water inlet temperature sensor 55 for detecting the cooling water inlet temperature. The rare absorbent pump P1 is configured such that the operating frequency is adjusted according to the temperature of the high-temperature regenerator 5 and the cooling water inlet temperature detected by the temperature sensors 54 and 55. In other words, the operating frequency of the rare absorbent pump P1 changes according to the load of the heat load, that is, the pressure in the low temperature regenerator 6. Specifically, the operating frequency of the rare absorbent pump P1 decreases as the pressure in the low temperature regenerator 6 decreases.
The control device 50 controls (adjusts) the opening degree of the rare absorbent distribution valve 40 according to the pressure in the low temperature regenerator 6, that is, the operating frequency of the rare absorbent pump P1.

FIG. 2 is a cross-sectional view showing the rare absorbent liquid distribution valve 40.
The rare absorbent distribution valve 40 includes a valve body 41, a seat (valve seat) 42 disposed in the valve body 41, a valve body 43 that contacts and separates from the seat 42 and adjusts a flow rate of fluid, and a valve body 43. , A cylindrical can (valve drive portion) 45 fixed to the valve body 41, and an inner peripheral portion of the can 45, which is rotatably supported and formed of a magnetic material such as a permanent magnet. A rotor 46, a feed screw 47 that converts the rotation of the rotor 46 into a contact / separation operation of the valve body 43 with respect to the seat 42, and a sleeve 48 that connects the feed screw 47 to the rotor 46 are provided. Reference numeral 146 denotes a stator. By sequentially passing current through a plurality of coils (not shown) wound around the stator 146, when the rotor 46 rotates in cooperation with the stator 146, the feed screw 47 rotates. The valve shaft 44 moves up and down, and the valve body 43 contacts and separates from the seat 42. The valve body 41 is a circular tube formed in a substantially L shape in a side view, and in the valve body 41, a rare absorbing liquid flows in the direction of the arrow B from the arrow A in FIG. In this case, since there is a small gap δ in the valve shaft penetrating portion 141 of the valve main body 41, entry of the rare absorbent into the inside of the can 45 is allowed through the gap δ.

  By the way, in the absorption refrigerator 100, the absorption liquid may contain a large amount of foreign matter such as iron (hereinafter simply referred to as foreign matter) adhering to the magnetic material due to long-term use or vacuum opening construction. If foreign matter enters the inside of the can 45 together with the absorbing liquid through the gap δ, it may cause a failure that causes the rare absorbing liquid distribution valve 40 to lock. When the rare absorbing liquid distribution valve 40 is locked, the balance of the ratio of the rare absorbing liquid distributed to the high temperature regenerator 5 and the low temperature regenerator 6 is lost and the performance is deteriorated. For this reason, it is required to maintain the performance by finding and dealing with the failure of the rare absorbent distribution valve 40 at an early stage. Further, if the rare absorbent distribution valve 40 fails, the absorption chiller 100 cannot be operated during the replacement period. Therefore, even if a failure occurs, it is required to operate the refrigerator as an emergency.

  Therefore, in the present embodiment, a bypass pipe 61 that bypasses the rare absorbent distribution valve 40 is provided in the fourth rare absorbent pipe 21D, and a damper (bypass valve) 62 is provided in the bypass pipe 61. The damper 62 is a valve device that can be manually adjusted in opening, and the damper 62 is closed during normal operation so that the absorbent does not flow through the bypass pipe 61. According to this, even if the rare absorbent distribution valve 40 is locked, it is distributed to the high temperature regenerator 5 and the low temperature regenerator 6 by manually adjusting the valve opening of the damper 62 appropriately. The ratio of the rare absorbent can be adjusted, and the operation of the absorption refrigerator 100 can be continued urgently without significantly reducing the performance. The user's comfort is not impaired by repairing the rare absorbent distributor valve 40 at night when the operation of the absorption refrigerator 100 is stopped or on a holiday.

Further, in the present configuration, the control device 50 serves as a determination unit that determines whether or not the rare absorbent liquid distribution valve 40 tends to be locked based on the index indicating the operation state during the operation of the absorption refrigerator 100. By functioning and recognizing in advance a failure sign of the rare absorbent dispensing valve 40, it is possible to detect the failure early and to quickly cope with the failure.
Specifically, the control device 50 acquires a coefficient of performance (COP) during operation, and determines whether or not the rare absorbent distribution valve 40 tends to lock based on the acquired coefficient of performance. In the first place, the rare absorbent distribution valve 40 adjusts the balance of the ratio of the rare absorbent distributed to the high temperature regenerator 5 and the low temperature regenerator 6 so that the absorption refrigerator 100 approaches the design value of the coefficient of performance. ing. For this reason, paying attention to the coefficient of performance during operation, if the deviation between the coefficient of performance and the design value becomes large, it is determined that the rare absorbent liquid distribution valve 40 tends to lock.

FIG. 3 is a graph showing a change in the design value of the coefficient of performance with respect to the cooling load, and data of this design value is stored in the storage unit of the control device 50.
The coefficient of performance is calculated based on the inlet and outlet temperatures of the brine measured by the temperature sensors 51 and 56, the brine flow rate measured by the flow meter 57, and the fuel flow rate measured by the fuel flow meter (not shown). Information indicating the relationship between the brine temperature, the brine flow rate, the fuel flow rate, and the coefficient of performance has been acquired in advance by experiments or the like, and the control device 50 performs the performance at the load during operation (cooling load) based on this information. Get the coefficient.
Then, the control device 50 determines whether or not the deviation between the acquired coefficient of performance and the design value is equal to or greater than a predetermined value (10% in the present embodiment). It is judged that the valve 40 has a tendency to lock, and a buzzer 65 is sounded. This buzzer 65 notifies that the rare absorbent liquid distribution valve 40 tends to lock and prompts the opening of the damper 62, and may make a predetermined sound or “open the damper. Please report "
As a result, the worker who heard this buzzer sound can directly operate the operation of the absorption refrigerator 100 without greatly degrading the performance by opening the damper 62 to a predetermined opening degree by contacting a maintenance company. Can continue as soon as possible.

As described above, the rare absorbent distribution valve 40 adjusts the opening degree by rotating the rotor 46 disposed in the can 45 with the stator 146 so that the valve body 43 is brought into contact with and separated from the seat 42. Yes. For this reason, in this structure, the confirmation jig | tool 70 which confirms whether the rare absorption liquid distribution valve 40 is locked is provided. As shown in FIG. 4A, the confirmation jig 70 is formed in a donut shape that fits in the outer peripheral portion of the can 45 from which the stator 146 has been removed, and an S pole and an N pole are sandwiched inside with an opening 70A that fits in the can 45. Are provided with permanent magnets (not shown). Therefore, for example, when the operation is stopped, the stator 146 is removed from the rare absorbent distribution valve 40 as shown in FIG. 4B, and a confirmation jig 70 is attached instead of the stator 146 as shown in FIG. 4A. . If the diluting liquid distribution valve 40 is not locked, the confirmation jig 70 is rotated in the direction A in the drawing, so that the rotor 46 in the can 45 is also rotated to contact the valve element 43 with the seat 42. Closed. In this case, when the valve element 43 comes into contact with the seat 42, they are rubbed and a sound is generated. Therefore, it can be easily confirmed whether or not the rare absorbing liquid distribution valve 40 is locked by making this sound. .
As a result, when the control device 50 determines that the rare absorbent dispensing valve 40 tends to lock, it can be easily confirmed whether this tendency is in the initial stage or has actually been locked. Can take the best measures against failure.

  As described above, according to the present embodiment, the high temperature regenerator 5, the low temperature regenerator 6, the condenser 7, the evaporator 1 and the absorber 2 are provided, and the rare absorbent in the absorber 2 is regenerated at high temperature. In the absorption chiller 100 that branches and flows into the regenerator 5 and the low temperature regenerator 6, the rare absorption that controls the ratio of the rare absorbent flowing through the high temperature regenerator 5 and the low temperature regenerator 6 by adjusting the valve opening degree. As discriminating means for discriminating whether or not the rare absorption liquid distribution valve 40 tends to lock on the basis of the liquid distribution valve 40, the damper 62 that bypasses the rare absorption liquid distribution valve 40, and the index indicating the operation state. Control device 50 and a buzzer 65 for notifying the opening of the damper 62 when the rare absorbent liquid distribution valve 40 tends to lock, so that the malfunction of the rare absorbent liquid distribution valve 40 is detected early. Can quickly respond to failures. . Furthermore, by opening the damper 62 that bypasses the rare absorbent distribution valve 40, the operation of the absorption chiller 100 can be continued even if the rare absorbent distribution valve 40 is in a malfunctioning state.

In addition, according to the present embodiment, the coefficient of performance at the time of driving is acquired as an index indicating the driving state, and the control device 50 is rare when the deviation between the coefficient of performance and the design value is larger than 10%. Since it is determined that the absorption liquid distribution valve 40 tends to be locked, it is possible to recognize in advance a sign that the rare absorption liquid distribution valve 40 has failed with a simple configuration.
In the first embodiment, as an index indicating the operation state, the inlet and outlet temperatures of the brine measured by the temperature sensors 51 and 56, the brine flow rate measured by the flow meter 57, and the fuel flow meter (illustrated) (Abbreviated)), the coefficient of performance calculated based on the fuel flow rate is used. However, the absorption refrigerator is determined based on the brine inlet temperature and outlet temperature measured by the temperature sensors 51 and 56 and the brine flow rate measured by the flow meter 57. You may acquire 100 performances (driving capability).

  Further, according to the present embodiment, the rare absorbing liquid distribution valve 40 includes the stator 46 disposed outside the can 45 with the magnetic rotor 46 disposed in the cylindrical can 45 fixed to the valve body 41. By rotating at 146, the valve body 43 connected to the rotor 46 is brought into contact with and separated from the seat 42 to adjust the valve opening, and can be attached to the can 45 instead of the stator 146. Since the confirmation jig 70 for confirming whether or not the rare absorption liquid distribution valve 40 is locked by manually rotating the rotor 46 by magnetic force, whether or not the rare absorption liquid distribution valve 40 is really locked or not is provided. Can be easily confirmed without removing the diluted absorbent distribution valve 40.

[Second Embodiment]
Next, a second embodiment will be described.
In the second embodiment, the absorption liquid concentration in the high temperature regenerator 5 or the absorption liquid concentration in the low temperature regenerator 6 is obtained instead of the coefficient of performance as an index indicating the operating state. Since the configuration of the absorption refrigerator 100 is the same as that of the first embodiment described above, the description thereof is omitted.
FIG. 5 is a graph showing changes in the design concentration (design value) of the absorbent in the high-temperature regenerator 5 and the design concentration (design value) of the absorbent in the low-temperature regenerator 6 with respect to the cooling load. The data is stored in the storage unit of the control device 50.
When the balance of the distribution ratio of the rare absorbent distribution valve 40 is lost, one of the absorption liquid concentration in the high temperature regenerator 5 and the absorption liquid concentration in the low temperature regenerator 6 becomes high and the other becomes low.
For this reason, it can be determined whether or not the rare absorbent distribution valve 40 tends to lock by paying attention to the absorbent concentration.

The absorption liquid concentration in the high temperature regenerator 5 is calculated based on the absorption liquid temperature in the high temperature regenerator 5 measured by the temperature sensor 54 and the refrigerant outlet temperature of the low temperature regenerator 6 measured by the temperature sensor 59. The absorption liquid temperature in the low temperature regenerator 6 is calculated based on the absorption liquid temperature in the low temperature regenerator 6 measured by the temperature sensor 58 and the refrigerant temperature at the outlet of the condenser 7 measured by the temperature sensor 60. Information indicating the relationship between the temperature and the concentration is acquired in advance by experiments or the like, and the control device 50 acquires the concentration of the absorbing liquid at the load during operation (cooling load) based on this information.
And the control apparatus 50 discriminate | determines whether the deviation of the acquired absorption liquid density | concentration and design value is more than predetermined value (2% in this embodiment), and when it is 2% or more, it is a rare absorption liquid. It is determined that the distribution valve 40 tends to lock. Since the operation after the determination is the same as that in the first embodiment described above, the description thereof is omitted.
In this embodiment, the absorption liquid concentration is acquired from the measured temperature. However, a concentration meter may be provided in each of the high temperature regenerator 5 and the low temperature regenerator 6 to directly acquire the absorption liquid concentration.

  According to the present embodiment, the absorption liquid concentration in the high temperature regenerator 5 or the absorption liquid concentration in the low temperature regenerator 6 is acquired as an index, and the control device 50 has a deviation between the absorption liquid concentration and the design value. When it becomes larger than 2%, it is determined that the rare absorbent liquid distribution valve 40 tends to be locked. Therefore, it is possible to recognize in advance a sign of failure of the rare absorbent liquid distribution valve 40 with a simple configuration.

[Third Embodiment]
Next, a third embodiment will be described.
In the third embodiment, the absorption liquid temperature in the high-temperature regenerator 5 is obtained instead of the coefficient of performance as an index indicating the operating state. Since the configuration of the absorption refrigerator 100 is the same as that of the first embodiment described above, the description thereof is omitted.
FIG. 6 is a graph showing changes in the design temperature (design value) of the absorbent in the high-temperature regenerator 5 with respect to the cooling load, and data on these design values is stored in the storage unit of the control device 50.
If the balance of the distribution ratio of the rare absorbent distribution valve 40 is lost, the amount of the absorbent in the high-temperature regenerator 5 fluctuates. Therefore, if the amount of the absorbent is increased, the heating becomes slow and the temperature of the absorbent is lowered. If it decreases, heating will become excess and absorption liquid temperature will rise. For this reason, it can be determined whether or not the rare absorbent distribution valve 40 tends to lock by paying attention to the temperature of the absorbent in the high-temperature regenerator 5.
The control device 50 determines whether or not the deviation between the measured absorption liquid temperature in the high-temperature regenerator 5 and the design value is equal to or greater than a predetermined value (5 ° C. in the present embodiment). Then, it is determined that the rare absorbent distribution valve 40 tends to lock. Since the operation after the determination is the same as that in the first embodiment described above, the description thereof is omitted.
According to the present embodiment, the absorption liquid temperature in the high-temperature regenerator 5 is acquired as an index, and the control device 50 rarely absorbs when the deviation between the absorption liquid temperature and the design value is larger than 5 ° C. Since it is determined that the liquid distribution valve 40 tends to lock, it is possible to recognize in advance a sign that the rare absorbent liquid distribution valve 40 will fail with a simple configuration.

[Fourth Embodiment]
Next, a fourth embodiment will be described.
FIG. 7 is a schematic configuration diagram of an absorption refrigerator 200 according to the fourth embodiment. The absorption chiller 200 is the same as that of the first embodiment except that it includes a rare absorbent distribution valve (first distribution valve) 40 and a bypass distribution valve (second distribution valve) 140 having the same configuration instead of the damper 62. Since it is configured in the same manner as the absorption refrigerator 100, the same parts as those in the absorption refrigerator 100 shown in FIG. Moreover, what was demonstrated in the said 2nd and 3rd embodiment can be combined as a parameter | index which shows a driving | running state.

As described above, the bypass distribution valve 140 has the same configuration as the rare absorbent distribution valve 40. However, during normal operation, the bypass distribution valve 140 has a control device (valve opening adjusting means) with a valve opening of 50. % Is controlled to be held.
In this state, when the control device 50 determines that the rare absorbent distribution valve 40 tends to lock, the control device 50 executes the opening degree control of the bypass distribution valve 140.

FIG. 8 is a flowchart showing the opening degree control operation of the bypass distribution valve 140.
First, when receiving a signal that the rare absorbent liquid distribution valve 40 tends to lock, the control device 50 acquires the absorbent concentration in the high temperature regenerator 5 (step S1). As described above, the concentration of the absorbing liquid in the high-temperature regenerator 5 is calculated from the absorbing liquid temperature in the high-temperature regenerator 5 and the refrigerant outlet temperature of the low-temperature regenerator 6, and thus the description thereof is omitted here. .
Subsequently, the control device 50 compares the deviation between the obtained absorption liquid concentration and the design concentration (design value) with a predetermined threshold (2% in the present embodiment) (step S2), and the deviation is ± (plus or minus). If it is within the range of 2%, the process is terminated because the opening is adjusted to an appropriate operation.
If the deviation is larger than-(minus) 2%, the control device 50 opens the opening of the bypass distribution valve 140 by α in the opening direction (step S3), and returns the process to step S1. Accordingly, the amount of the absorbing liquid in the high-temperature regenerator 5 is relatively decreased by the increase in the flow rate of the rare absorbing liquid flowing in the low-temperature regenerator 6, and the concentration of the absorbing liquid is increased. When the deviation is larger than + (plus) 2%, the control device 50 closes the opening of the bypass distribution valve 140 by α in the closing direction (step S4), and returns the process to step S1. As a result, the amount of the absorbing liquid in the high temperature regenerator 5 is relatively increased and the concentration of the absorbing liquid is decreased by the amount of the rare absorbing liquid flowing through the low temperature regenerator 6 being decreased. By repeatedly executing the control of these steps S1 to S4, the distribution ratio of the rare absorbent flowing through the high temperature regenerator 5 and the low temperature regenerator 6 can be properly maintained.

  According to this embodiment, the high-temperature regenerator 5, the low-temperature regenerator 6, and the absorber 2 are provided, and the dilute absorbent in the absorber 2 is branched into the high-temperature regenerator 5 and the low-temperature regenerator 6. In the absorption chiller 200, a rare absorbent distribution valve 40 that controls the ratio of the rare absorbent flowing through the high temperature regenerator 5 and the low temperature regenerator 6 by adjusting the valve opening, and the rare absorbent distribution valve 40 Discrimination having the same configuration and determining whether or not the rare absorbent liquid distribution valve 40 tends to lock based on the bypass distribution valve 140 that bypasses the rare absorbent liquid distribution valve 40 and the index indicating the operating state Since the control device 50 as a means and the control device 50 as a valve opening adjusting means for controlling the valve opening degree of the bypass distribution valve 140 when the rare absorbing liquid distribution valve 40 tends to be locked, the control device 50 is rare. Early detection of failure of absorbent distributor valve 40 Preparative it is, it can also be properly continue the operation of the absorption refrigerator 200 as the diluted absorption fluid dispensing valve 40 was in the failed state.

  In this embodiment, when adjusting the opening degree of the bypass distribution valve 140, the absorption liquid concentration of the high temperature regenerator 5 is acquired, but this is not a limitation, and the absorption liquid concentration of the low temperature regenerator 6 is acquired. The absorption liquid temperature of the high-temperature regenerator 5, the performance of the absorption refrigerator 100, and the coefficient of performance may be acquired. In this case, the configuration can be simplified by using the same index that is obtained when determining whether or not the rare absorbent liquid distribution valve 40 tends to lock.

However, the above embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the performance of the absorption refrigeration machine 100, the coefficient of performance, the absorption liquid concentration of the high temperature regenerator 5, the absorption liquid concentration of the low temperature regenerator 6, the absorption of the high temperature regenerator 5 are used as indices indicating the operating state. Although what acquired liquid temperature was demonstrated, it is not restricted to this, For example, the frequency | count that the liquid level sensor 53 of the high temperature regenerator 5 detects the high water level of absorption liquid, and the frequency | count that the rare absorption liquid pump P1 stopped the operation | movement. When the predetermined number of times (for example, 10 times) or more is reached within a predetermined time, it can be determined that the rare absorbent liquid distribution valve 40 tends to lock based on this.
Moreover, in the said embodiment, although the rare absorption liquid distribution valve 40, the damper 62, and the bypass distribution valve 140 were provided in the 4th rare absorption liquid pipe | tube 21D connected to the low temperature regenerator 6, these are connected to the high temperature regenerator 5. You may provide in the 3rd rare absorption liquid pipe | tube 21C connected to.

Moreover, although the said embodiment demonstrated the structure provided with the gas burner 4 which burns and burns fuel gas as a heating means which heats absorption liquid in the high temperature regenerator 5, it is not restricted to this, Kerosene or It is good also as a structure provided with the burner which burns A heavy oil, or the structure heated using warm heat, such as a vapor | steam and exhaust gas.
In the above embodiment, the absorption chiller / heater is a double-effect type, but this is not limited to single-effect type, single-double-effect type and triple-effect type absorption chiller / heater and absorption heat pump devices. Of course, the invention is applicable.

DESCRIPTION OF SYMBOLS 1 Evaporator 2 Absorber 5 High temperature regenerator 6 Low temperature regenerator 7 Condenser 21D 4th rare absorption liquid pipe 40 Rare absorption liquid distribution valve (distribution valve, 1st distribution valve)
41 Valve body 42 Seat (valve seat)
43 Valve body 45 Can (valve drive part)
46 Rotor 50 Control device (discriminating means, valve opening adjusting means)
61 Bypass pipe 62 Damper (Bypass valve)
65 Buzzer (notification means)
70 Confirmation jig 100, 200 Absorption refrigerator 140 Bypass distribution valve (second distribution valve)

Claims (5)

In an absorption refrigerating machine comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and diluting the rare absorbent in the absorber into the high temperature regenerator and the low temperature regenerator. ,
Based on the distribution valve that controls the ratio of the rare absorbent flowing through the high temperature regenerator and the low temperature regenerator by adjusting the valve opening, the bypass valve that bypasses the distribution valve, and the indicator that indicates the operating state, discriminating means for discriminating whether or not there is a tendency that the distribution valve is locked, if there is a tendency that the distribution valve is locked, Bei example and informing means for informing a prompting the opening of the bypass valve,
A coefficient of performance during operation is acquired as the index, and the determination means determines that the distribution valve tends to lock when a deviation between the coefficient of performance and a design value is greater than a predetermined value. Absorption type refrigerator that features. In an absorption refrigerating machine comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and diluting the rare absorbent in the absorber into the high temperature regenerator and the low temperature regenerator. ,
  Based on the distribution valve that controls the ratio of the rare absorbent flowing through the high temperature regenerator and the low temperature regenerator by adjusting the valve opening, the bypass valve that bypasses the distribution valve, and the indicator that indicates the operating state, Determining means for determining whether or not the distribution valve tends to lock, and notification means for notifying that the bypass valve is to be opened when the distribution valve tends to lock,
The absorption liquid concentration in the high temperature regenerator or the absorption liquid concentration in the low temperature regenerator is acquired as the index, and the discriminating means has a deviation between the absorption liquid concentration and a design value larger than a predetermined value. In the case of the absorption refrigeration machine, it is determined that the distribution valve tends to lock. In an absorption refrigerating machine comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and diluting the rare absorbent in the absorber into the high temperature regenerator and the low temperature regenerator. ,
  Based on the distribution valve that controls the ratio of the rare absorbent flowing through the high temperature regenerator and the low temperature regenerator by adjusting the valve opening, the bypass valve that bypasses the distribution valve, and the indicator that indicates the operating state, Determining means for determining whether or not the distribution valve tends to lock, and notification means for notifying that the bypass valve is to be opened when the distribution valve tends to lock,
The absorption liquid temperature in the high-temperature regenerator is acquired as the index, and the determination means tends to lock the distribution valve when the deviation between the absorption liquid temperature and a design value becomes larger than a predetermined value. Absorption refrigerator characterized by determining that there is. The distributing valve causes a valve body connected to the rotor to contact and separate from a valve seat by rotating a magnetic rotor disposed in a cylindrical valve driving unit fixed to the valve body with a stator. In order to check whether the distribution valve is locked by rotating the rotor manually by magnetic force, which is configured to be adjustable to the valve drive unit instead of the stator. An absorption refrigerator according to any one of claims 1 to 3, further comprising a confirmation jig . In an absorption refrigerating machine comprising a high temperature regenerator, a low temperature regenerator, a condenser, an evaporator, and an absorber, and diluting the rare absorbent in the absorber into the high temperature regenerator and the low temperature regenerator. ,
  A first distribution valve that controls a ratio of a rare absorbent flowing through the high temperature regenerator and the low temperature regenerator by adjusting a valve opening, and has the same configuration as the first distribution valve; A second distribution valve that bypasses the first distribution valve, a determination unit that determines whether or not the first distribution valve tends to lock based on an index that indicates an operating state, and the first distribution valve tends to lock In this case, the absorption refrigeration machine includes valve opening degree adjusting means for controlling the valve opening degree of the second distribution valve.

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