JPH0586542B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an operation data recording device for an absorption refrigerator, an absorption heat pump, an absorption chiller/heater, or the like (hereinafter referred to as an absorption refrigerator). The operating data herein refers to changes in physical quantities of predetermined portions of the absorption chiller, such as the temperature and pressure inside the generator or the temperature and flow rate of the cold water flow path, for each set time while the absorption chiller is in operation.

(b) Conventional technology Absorption chillers are often used as large-capacity cold/hot heat source machines for air conditioning in buildings, factories, etc., and are expensive, so they have traditionally been difficult to manage by operation managers. Daily operating data is recorded [Published by the Japan Refrigeration and Air Conditioning Industry Association (first edition revised in February 1981) "Correct operating method for gas absorption chiller/heaters and absorption chillers"
See pages 55-58].

By recording daily operating data in this way, it is possible to understand the state of the absorption chiller during normal operation, and it becomes possible to catch signs of abnormal phenomena and detect problems early.It also makes it possible to organize the records of daily operating data. This has various advantages, such as being able to see changes over time, making it easier to diagnose failure locations, and when a problem occurs, service personnel can easily determine the cause of the problem and take prompt action. Due to these advantages, expensive absorption chillers can be used at a lower total cost, which is why operating data is recorded manually.

(c) Problems to be solved by the invention Conventionally, the recording of driving data is done manually, so the recording is done at most several times a day [every 1 to 2 hours]. This is the actual situation, and further manual recording is not practical.

On the other hand, failures or abnormalities in absorption refrigerators often occur within a short period of time (for example, from several minutes to more than ten minutes). In such cases, simply manually recording operating data every 1 to 2 hours does not catch the signs of abnormality, and the true cause of the failure cannot be fully investigated, resulting in the same failure occurring again. .

In view of these problems, the present invention aims to provide a device that can automatically record operation data of an absorption chiller from start to stop at short intervals instead of manually. .

(d) Means for Solving the Problems The present invention, as a means for solving the above-mentioned problems, provides physical quantities of a predetermined portion of an absorption refrigerator (temperature and pressure inside the generator, heat source fluid flowing out from the generator). A sensor that detects temperature, flow rate of heat source fluid (or fuel), temperature of cold water at the entrance and exit of the evaporator, flow rate of cold water, etc.) and a cassette for storing data of the physical quantities upon receiving a signal from this sensor and a start signal for the absorption chiller. a data storage unit that starts storing the physical quantities in a data storage cassette at predetermined time intervals, and stops storing the physical quantities in response to a stop signal from the absorption chiller; It consists of a data display unit that prints out or displays the data stored in the cassette as a table or graph, and the data storage unit, data display unit, sensor, and absorption chiller control unit are connected via an interface. These are connected to form an operation data recording device for an absorption chiller.

(E) Effect In the apparatus of the present invention, the above-mentioned sensor and data storage unit store operating data of each part of the absorption chiller in the data storage cassette every short period of time (for example, every three times) instead of manually. It has the function of printing out or displaying the data stored in the data storage cassette as tables and graphs that are easy for humans to understand using the data display unit. At the same time, data storage is stopped at the stop signal of the absorption chiller, and by displaying the data, the physical quantities of each part of the absorption chiller during operation are recorded and recovered as data, and the data can be recovered while the operation is stopped. It has the function of automatically pausing data recording. This function allows operation managers and service personnel to grasp detailed trends in the absorption chiller's operating status at a glance, without having to perform complicated manual inspections, and also to identify signs of abnormalities and the true nature of failures. The device of the present invention can also be useful in correctly diagnosing the cause of.

(F) Embodiment FIG. 1 is a schematic structural explanatory diagram showing an embodiment of a recording device for operation data of an absorption refrigerator according to the present invention. In Fig. 1, A is an absorption refrigerator, which includes a high temperature generator 1, a low temperature generator 2, a condenser 3, an evaporator 4, an absorber 5, a low temperature solution heat exchanger 6, and a high temperature solution heat exchanger. Exchanger 7, pump P _R for refrigerant liquid
and pump P _A for absorption liquid, pipes 8 and 9 through which the refrigerant flows, pipe 10 through which the refrigerant liquid flows, pipes 11 and 12 through which the refrigerant liquid flows back, and pipe 1 through which the absorption liquid is sent.
3, 14, 15, 16 and the pipes 17, 18, 19, 20 through which the absorption liquid flows, thereby creating a circulation path for the refrigerant [water] and absorption liquid [lithium bromide aqueous solution] similar to the conventional absorption refrigerator. It consists of
21 is a combustion heating chamber of the high temperature generator 1, 22, 22...
A heating pipe through which combustion gas flows, 23 a flue for combustion exhaust gas, 24 a heater for the low temperature generator 2, 25, 26
are the condenser 3 and absorber 5 coolers, respectively,
27 is a heat exchanger built into the evaporator 4. 29
is a fuel supply path that leads fuel to the combustion heating chamber 21 of the high temperature generator 1, and a flow control valve V _F is installed in this fuel supply path.
is provided. 30, 31, 32 are coolers 26,
25 are connected in series for cooling water, and 3
3 and 34 are cold water or hot water pipes connecting the heat exchanger 27 and a load-side heat exchange unit (not shown). When a plurality of load-side heat exchange units are installed, the pipes 33 and 34 serve as main pipes. Further, 35 is a pipe connecting the bodies of the evaporator 4 and absorber 5 to the pipe 8, and this pipe has a cold/hot switching valve.
V ₁ is provided. Further, 36 is a pipe connecting the discharge side pipe 14 of the pump P _A and the liquid reservoir of the evaporator 4, and 37 is a pipe connecting the pipe 17 and the lower part of the absorber 5. The passages 36 and 37 are also provided with cold/hot switching valves V ₂ and V ₃ , respectively. and,
When switching from cold water supply to hot water supply to the load side heat exchange unit, refrigerant vapor from high temperature generator 1 is transferred to evaporator 4 by switching these cold/hot switching valves V ₁ , V ₂ , V ₃ from closed to open. Sink heat exchanger 27
The water in the heat exchanger 27 is heated by the latent heat of condensation of the refrigerant vapor, and the absorption liquid is diluted with the refrigerant liquid to lower its boiling temperature and increase the thermal efficiency of the high temperature generator 1. Note that 38 is a non-condensable gas extraction device, and 39 is a refrigerant blowing conduit with a valve _V4 . S _PG is a sensor for detecting vapor pressure provided in the gas phase part of the high temperature generator 1, S _TG is a sensor provided on the wall or inside the liquid reservoir of the high temperature generator 1 as a temperature detection means, S _TA is pipe line 1 for absorption liquid
S _TWG is a temperature detection sensor provided in the flue 23 or on its outer wall (hereinafter referred to as provided in the pipe), S _FF is a flow rate sensor provided in the fuel supply path 29 sensor for detection,
S _TENR and S _TEXR are sensors for detecting temperature provided in conduits 30 and 32, respectively, S _FR is a sensor for detecting flow rate provided in conduit 32, and S _TENX and S _TEXX are provided in conduits 33 and 34, respectively. SFX is a sensor for detecting temperature, and _SFX is a sensor for detecting flow rate provided in the pipe line 33.

DCB is the operation panel that is the control part of the absorption chiller.
DDR is a unit for storing driving data which is a data storage means, and PR is a printer which is a data display means.

The above-mentioned sensors S _PG , S _TG , S _TA , S _TWG , S _FF , S _TENR , S _TEXR ,
S _FR , S _TENX , S _TEXX , S _FX , operation panel DCB,
The driving data recording unit DDR and the printer PR, which is one of the interfaces, are electrically connected (or connected together using an optical communication cable) to constitute the driving data recording device.
Although not shown in Fig. 1, an absorption refrigerator A
There is a heating control device that adjusts the heating amount of the high temperature generator 1 based on the signal from the cold and hot water temperature detector (or a load detector that detects the amount of heat), as well as a heating control device that prevents cold water from freezing, prevents crystallization of the absorption liquid, and overheats the high temperature generator 1. It goes without saying that a protection device for temporarily stopping the operation and a device for diluting the absorption liquid are provided in the same manner as conventional absorption refrigerators in order to prevent or prevent an excessive rise in internal pressure.

FIG. 2 is an explanatory diagram showing an overview of the system configuration of the driving data recording device shown in FIG. 1. Second
In the figure, C is RAM, which is a data storage element.
[Random access memory] cassette (hereinafter referred to as
This cassette is removably attached to the driving data recording unit DDR. SW _DDR , E ₂ , and O.D.P are a power switch, an insertion slot for RAM cassette C, and an operation/display section, respectively, provided on the front panel side of the driving data recording unit DDR. C _a1 is a cable connecting the driving data recording unit DDR and printer PR, C _ODDR and C _OPR are power cords, and TR is a power transformer. OP, PL, and P are the printer PR's operating section and plotter section, respectively. [The printer paper is built into this plotter section. ]. Further, a is an analog signal from various sensors (see Figure 1), and d is a pulse signal (digital signal) from the operation control panel DCB of absorption chiller A.The unit for recording operation data DDR is , upon receiving the data accumulation start signal from the operation panel DCB, for a predetermined period of time (for example, 3 minutes)
Each time, the physical quantities sensed by various sensors are stored as data in RAM cassette C, and the operation panel
When it receives a data storage stop signal from the DCB, it ends the storage, and when it receives a data collection signal from the operation panel DCB, the RAM
Printer PR with data accumulated in cassette C
Plot as tables or graphs on paper (printer)
PR printouts].

FIG. 3 is an explanatory diagram of a system configuration in which a personal computer with a display function (hereinafter referred to as a personal computer) is connected to the system shown in FIG. In Figure 3, PCOM) is a personal computer, and C _a2 and C _a3 are cables. Also, D.P.
KB and FDE are the display section, keyboard, and floppy disk insertion slot of the personal computer PCOM, respectively. The system shown in Fig. 3 may be used separately from various sensors and the operation panel DCB, and used exclusively for data display and printout. For example, the RAM cassette C in which data is stored by the operation manager of the absorption chiller A may be used as a system for a service person to take back to a service station and use for data analysis.

FIG. 4 is an explanatory diagram showing the front panel of the driving data recording unit DDR. In Figure 4, SW _DDR is the power switch, E ₁ and E ₂ are the insertion slots for RAM cassette C, LCD・P is the liquid crystal display section, and O・
SW, O, SW… are touch-type operation switches, L _a
is a flashing lamp. Then, by appropriately operating the operation switches O・SW, O・SW...
Various conditions such as data accumulation interval [every 2 seconds to every 60 minutes and 59 seconds] and display format are set. The liquid crystal display section LCD・P is operated by the operation switch O・
Conditions set by SW, O, SW, etc. and part of the data are displayed in 16-digit alphabets, numbers, and symbols. In addition, a flashing lamp
L _a lights up when data is being written to or read from the RAM cassette.

FIG. 5 is a block diagram showing an example of the system configuration of the driving data recording device of the present invention. In FIG. 5, 101 is a CPU as a central process unit, 102 is an analog input terminal as an interface for inputting analog signals, 103 is a multiplexer, and 104 is an analog input terminal as an interface for inputting analog signals.
105 is an A/D converter, 105 is a digital signal input interface, 106 is a programmable controller, and 107 is an operating data recording unit.
Internal RAM 108 is a random access memory built into the DDR, and ROM is a read-only memory. 109 corresponds to the operation switches O.SW, O.SW, etc. shown in FIG. Delete the data [hereinafter referred to as
This is a setting section that determines whether or not to clear the RAM cassette. 110 is a display section corresponding to the liquid crystal display section LCD-P and the blinking lamp _La shown in FIG. 4, and 111 is a clock. 112 is a PC modem I/F as a PC PCOM and modem interface, 113 is a printer I/F as a printer PR interface, 114 is a parallel BUS I/F as an expansion BUS interface, 115
is used as an interface for RAM cassette C.
This is an I/F for RAM cassette. Also, 116 is
DC power supply, 117 is an AC power supply unit, 118 is a time relay connected to the operation control panel DCB of absorption chiller A,
119 is a relay switch with a noise filter connected to the power source 120 side, and this switch is designed to operate in response to the time relay 119. The digital signal input interface 105 receives a data accumulation start signal [for example, a start signal for absorption chiller A], a data accumulation stop signal, and a data collection signal [for example, a stop signal for absorption chiller A] from the operation panel DCB. It is now possible to input various digital signals such as Although not shown, the digital signal input interface 105 is also equipped with a photocoupler. Furthermore, various analog signals such as signals from various sensors can be input to the analog input terminal 102. Note that it is also possible to connect a sensor that emits a pulse signal to the digital signal input interface 105.

6 and 7 are flowcharts showing operation examples of the driving data recording device according to the present invention, respectively. FIG. 6 is a flowchart in a data storage operation, and FIG. 7 is a flowchart in a data collection operation. be.

Next, a fifth example of the operation of the driving data recording device of the present invention explained in FIGS. 1 to 5 will be explained.
This will be briefly explained with reference to the drawings and FIG. Note that a detailed explanation of signal exchange between the CPU, ROM, RAM, various interfaces, etc. will be omitted here.

When a start signal is sent from the operation panel DCB, absorption chiller A starts operating, and then the operation data recording unit DDR that receives the start signal (digital signal such as a pulse signal) determines whether or not to clear the RAM cassette. to judge. This determination is made by the setting unit 109, CPU 101, ROM 108, and
This is done by exchanging signals between the programmable controller 106 and the like. Judgment
If YES (that is, RAM cassette clear is required), the data stored in RAM cassette C is erased by the driving data recording unit DDR (RAM cassette clear operation). And, with this unit DDR, the sensor S _PG ,
S _TG , S _TA , S _TWG , S _FF , S _TENR , S _TEXR , S _FR , S _TENX ,
The sensing object quantities of S _TEXX and S _FX [see Figure 1] are stored as new data in the RAM cassette C based on the conditions [data storage interval and other conditions] set in the setting section 109. be remembered. Moreover, if the determination is NO, data storage is performed without the RAM cassette clear operation. In this way, changes in the physical quantities of predetermined parts during operation of the absorption refrigerator A are automatically accumulated as data. Note that data storage is performed by the setting unit 109.
By appropriately changing the settings, it is also possible to arbitrarily select the target, for example, to target only the liquid temperature of the high temperature generator 1.

Then, when an operation stop signal (digital signal such as a pulse signal) is transmitted from the operation panel DCB, the heating of the high temperature generator 1 of the absorption refrigerator A is stopped and the dilution operation of the absorption liquid is started. On the other hand, the operation data recording unit DDR, which receives the operation stop signal from the operation panel DCB, reads out the data stored in the RAM cassette C and sets the conditions set in the setting section 109 [such as the type of data to be read and output]. Based on the conditions such as display format, data is output as a table or graph from the printer PR (data collection). In this operation example, the operation stop signal serves as both the data accumulation signal and the data collection signal shown in FIG. Then,
After a certain period of time (approximately 20 minutes), the operation panel DCB
A built-in time relay (not shown) is activated, and the signal from this time relay (pulse signal) stops the absorption liquid pump P _A and completes the dilution operation (completely stops the absorption refrigerator). . On the other hand, on the unit DDR side, after the time required for printout has elapsed (after data collection is completed), the power supply to the unit DDR and printer PR is stopped by the signal [pulse signal] from the time relay 118 shown in FIG. It is cut off, and these also stop [the unit stops]. Note that the timer for the time relay 118 is reset by a start signal or an operation stop signal of the absorption refrigerator A. Furthermore, instead of providing the relay switch 118 on the power supply 120 side, an appropriate noise filter is provided on the unit DDR side and the pulse signal of the time relay 118 is transferred to the digital signal input interface 10.
5 may be input. In this way, the operation data of each predetermined part of the absorption refrigerator A is printed out (data collected) in the form of a table or a graph. Note that data collection is performed by the setting unit 10.
By appropriately changing the settings of 9, it is possible to arbitrarily select the target as required, such as to target only a specific piece of data stored in the RAM cassette C.

FIG. 8 is a chart printed out by printer PR as an example of data collection.
In this chart, July 29, 1985 16:13:42
Operation data from the time of the second to the time of 17:13:42 is printed every three minutes. Furthermore, five data collection targets (five channels) have been selected. i.e. 1CH, 2CH, 3CH and
4CH represents the cold water inlet temperature, cold water outlet temperature, cooling water inlet temperature, and cooling water outlet temperature of the absorption refrigerator, respectively, and 5CH represents the temperature of the absorption liquid in the high temperature generator 1 of the absorption refrigerator.

Figure 9 is a trend graph of the data shown in Figure 8 and printed out using a PR printer.
Operation data from 16:13:42 to 19:13:42 is plotted every 3 minutes.
In FIG. 9, the vertical axis represents temperature [° C.], and the horizontal axis represents time. Also, broken lines 1, 2, 3,
4 shows the changes in the cold water inlet temperature, cold water outlet temperature, cooling water inlet temperature, and cooling water outlet temperature, respectively, and the broken line 5
shows the change in the temperature of the absorption liquid in the high-temperature generator.

In the operating data shown in FIGS. 8 and 9, there are no significant changes in the chilled water temperature, cooling water temperature, or absorption liquid temperature, which are approximately within the predetermined temperature range. This allows you to see at a glance that the absorption refrigerator is operating normally. For example, if the temperature of the absorption liquid in the high temperature generator 1 is plotted outside the predetermined temperature range even though the chilled water temperature and the cooling water temperature are approximately within the predetermined temperature range, there is a sign of an abnormality. This will be expressed as data. In such a case, the operation manager should print out other data such as the internal pressure of the high temperature generator 1 and the temperature of the combustion exhaust gas, provide this data to the service engineer, and have the service engineer immediately begin investigating the cause of the abnormality. You can also do it.

As described above, by using the operation data recording device of the present invention, the operation manager does not have to measure the physical quantities of each part of the absorption chiller A and record the data himself, and moreover, he can record the operation data every short period of time. Records can also be easily obtained. By obtaining records of detailed operation data for each short period of time, the operation manager can know at a glance whether absorption chiller A is operating normally or not.
Signs of abnormality can be seen at a glance, and service personnel can immediately begin investigating the cause. Therefore, it becomes possible to prevent serious failures of the absorption refrigerator, and it becomes possible to perform maintenance of the absorption refrigerator even better. Moreover, since the operation recording device of the present invention stops its operation after a predetermined period of time in response to the operation stop signal of the absorption chiller A, it also has the advantage of automatically stopping wasteful power consumption of the device. Furthermore, in the driving recording device of the present invention, a
Since the RAM cassette C is detachably provided in the unit DDR, there is an advantage that the data stored in the RAM cassette C can be analyzed in detail at a service center, for example.

(g) Effects of the Invention As described above, the absorption chiller operation data recording device of the present invention eliminates the need for the operation manager to measure the physical quantities of each part of the absorption chiller and store the data himself, and also saves time. Detailed hourly operation data records are presented to operation managers and service personnel in easy-to-understand tables and graphs, so they can tell them whether the absorption chiller is operating normally or not. Signs of abnormalities can be seen at a glance, making it possible to prevent serious malfunctions of the absorption chiller before they occur, and making it possible to perform better maintenance of the absorption chiller. The practical effect is that it can help reduce the repair and maintenance costs of the refrigerator, and as a result, it can help save the total cost to a large extent.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration explanatory diagram showing an embodiment of an operation data recording device for an absorption chiller according to the present invention, and FIG. 2 is an explanatory diagram showing an overview of the system configuration of the operation data recording device shown in FIG. 1. , Fig. 3 is an explanatory diagram of the system configuration in which a personal computer with a display function is connected to the system shown in Fig. 2, and Fig. 4 shows the front panel of the operating data recording unit shown in Figs. 1 to 3. 5 is a block diagram showing an example of the system configuration of the driving data recording device of the present invention, and FIG. 6 is a flowchart showing an example of the operation of the data storage operation of the driving data recording device of the present invention. Fig. 7 is a flowchart showing an example of the data collection operation of the device, Fig. 8 is a chart printed out or displayed as an example of operating data, and Fig. 9 is a chart printed out or displayed as an example of operating data. This is a trend graph of displayed data. A...Absorption chiller, DSB...operation panel,
DDR...Operation data recording unit, PR...Printer, S _PG , S _TG , S _TA , S _TWG , S _FF , S _TENR ,
S _TEXR , S _FR , S _TENX , S _TEXX , S _FX ...Sensor, C
...RAM cassette, E ₁ , E ₂ ... RAM cassette insertion slot, O/D/P... operation/display section,
PCOM...Personal computer, O/SW
...Operation switch, 101...CPU, 102...
... Analog input terminal, 105 ... Digital signal input interface, 109 ... Setting section, 11
1...Clock, 112...PC modem I/
F, 113...Printer I/F, 115...
RAM cassette I/F, 118...Time relay, 119...Relay switch, 120...Power supply.

Claims (1)

[Claims] 1. A detection means for sensing the temperature or pressure of a predetermined part such as a generator or a chilled water flow path, or a physical quantity such as a fluid flow rate, and receiving a signal from this detection means and detecting the a data storage means that starts storing a physical quantity in a data storage element, stores the physical quantity in the data storage element at predetermined time intervals, and stops storing the physical quantity in response to a stop signal of an absorption refrigerator; and a data display means for printing out or displaying data stored in a data storage element by the means as a table or graph, and the data storage means, the data display means, the detection means, and the control section of the absorption chiller interface with each other. An operation data recording device for an absorption chiller characterized by being connected via a.