JPH02110268A - Operating status monitoring device for refrigeration and air conditioners - Google Patents

Abstract

PURPOSE:To alarm the leakage of gas correctly by a method wherein the degree of overcooling, the degree of overheating, a temperature difference between a discharged gas temperature and a condensing temperature and another temperature difference between the temperature of a cooled space and an evaporating temperature are compared with the reference set values thereof respectively. CONSTITUTION:A temperature difference between a condensing temperature and a refrigerant temperature at the outlet port of a condenser is operated by the inputs of detecting signals outputted from respective detecting means 31a-31d, 32a, 32b. When all of a first condition or (1) a temperature difference between the temperature of the condenser and the refrigerant temperature at the outlet port of the condenser < a reference set value of overcooling, a second condition or (2) a temperature difference between the suction gas temperature of a compressor and an evaporating temperature > a reference set value of overheating, a third condition or (3) a temperature difference between the discharging gas temperature of the compressor and a condensing temperature > the first reference set value of temperature difference and a fourth condition or (4) a temperature difference between the temperature of a cooled space and the evaporating temperature > the second reference set value of temperature difference are satisfied based on the output of an operating means effecting the comparison of said temperature difference with a preset reference value of the temperature difference, alarm for the leakage of gas is indicated. When either three conditions among said four conditions are satisfied, attention for the leakage of gas is indicated.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is a refrigeration/empty tA machine that monitors the operating status of a refrigeration/empty tA machine.
This invention relates to improvement of an operating state monitoring device for air conditioners.

[Conventional technology]

4 and 5 are block diagrams of a conventional operating state monitoring device for a refrigerator/air conditioner, and FIG. 6 is an example of a screen display of a CRT connected to a conventional central control device. In the figure,
(11 is a central control unit and a signal collection storage device (2
1) It manages the data from ~(2n) and outputs control signals to the signal collection storage devices (21) ~ (2n), and sends and receives data to and from the signal collection storage devices (21) ~ (2n). Transmission ■/F (6) that performs
(21, arithmetic unit (CPU) that calculates data +71
, means for storing data (5), a keyboard (3) for recalling analysis graphs and data, and a line printer (4) for outputting data are connected. (21),
(22), ..., (2n) is a signal collection storage device, and transmission lines αD, 0. ......, is connected to the central control unit +11 by (in), performs transmission with the central control unit (1), manages operating status signals of the refrigeration and air conditioners, and controls input/output signals. - A central processing unit (41) that performs calculations, a temperature detector (31) that detects the temperature of each part of the refrigeration and air conditioner, a pressure detector (32) that detects the pressure of each part, and a protective device (for example, a high pressure switch). Protective device differential detector (3
3), an input interface (43) that inputs data from a contact state detector (34) that detects whether the compressor is operating, etc., and an R A that stores the above input data.
M (44), a display unit (45) that displays abnormalities such as differential protection devices of refrigeration and air conditioners, operation display, etc., and a transmission ink face (4) that performs transmission with the central control unit (1).
6) Turn on the refrigeration/air conditioner control switch (35).
, an output interface (47) that outputs a control signal such as an OFF command, and an input 1/F.

It consisted of a clock pulse generator (48), etc., which took the timing of data transmission and reception to the output 1/F and the transmission 1/F. The central control device (1) controls each signal collection device (21) to (
Analyze and calculate the input data from 2n) and, for example, if the evaporation pressure of the refrigerator/air conditioner is below a predetermined value, CRT 12)
As shown in Figure 6 above, the screen was configured to display the occurrence of an abnormality (gas leak alarm) and report the abnormality.In the case of the screen display example shown in Figure 6, the system reports that there is an abnormality in Unit 2. Was.

[Problem to be solved by the invention]

Conventional equipment is configured as described above, and gas leaks are determined only by evaporation pressure. Therefore, if the outside temperature is low or the evaporation pressure decreases due to frost formation on the evaporator, it may be mistakenly detected. In some cases, a gas leak warning was displayed.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a refrigerator/air conditioner operating state monitoring device that can accurately issue a gas leak warning.

[Means to solve the problem]

In this invention, the condensation pressure of the refrigeration cycle is formed through a compressor, a condenser, an expansion device, an evaporator, etc.
Alternatively, a condensation state value detection means for detecting the condensation temperature, a condenser outlet refrigerant temperature detection means for detecting the refrigerant temperature at the outlet of the 41 condenser of the refrigeration cycle, and an evaporation state value detection means for detecting the evaporation pressure or evaporation temperature of the refrigeration cycle. value detection means, suction gas temperature detection means for detecting the compressor suction gas temperature of the refrigeration cycle, discharge gas temperature detection means for detecting the compressor discharge gas temperature of the refrigeration cycle, and a cooled space cooled by the evaporator. Temperature detection means, inputs the detection signals output from each of the above detection means, calculates the difference between the condensing temperature and the condenser outlet refrigerant temperature, and compares this temperature difference with a preset standard supercooling degree set value. , calculate the temperature difference between the suction gas temperature and the evaporation temperature, compare this temperature difference with a preset standard superheat degree set value, calculate the temperature difference between the compressor discharge gas temperature and the condensing temperature, and calculate the temperature The difference is compared with a preset first reference temperature difference set value, and the temperature difference between the cooled space temperature and the evaporation temperature is calculated, and this temperature difference is compared with a preset second reference temperature difference set value.
Based on the calculation means that performs a comparison with the reference temperature difference setting value, and the output from the calculation means, the first condition; [cooling degree set value], second condition; [temperature difference between the compressor intake gas temperature and the above evaporation temperature]] [the above reference superheat degree set value], third condition; [discharge gas temperature of the compressor and the condensing temperature]> (the above-mentioned first reference temperature difference setting value), and a fourth condition [the temperature difference between the above-mentioned cooled space temperature and the evaporation temperature]> [the above-mentioned second reference temperature difference setting] By providing a display means that displays a gas leak alarm when all the conditions of [value] are satisfied, and also displays a gas leak warning when any three of the above four conditions are satisfied, the refrigeration/air conditioner The above object is achieved by configuring a driving state AT vision device.

[Effect]

The refrigeration/air conditioner operating state monitoring device according to the present invention determines the degree of supercooling (the difference between the condensing temperature and the condenser outlet refrigerant temperature), the degree of superheating (the difference between the intake gas temperature and the evaporation temperature), based on the operation state data.
Gas leak status is determined based on the results of comparison between the temperature difference between the discharge gas temperature and the condensation temperature, the temperature difference between the cooled space temperature and the evaporation temperature, and the reference setting values set in advance corresponding to these values. It is something to detect.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (55) is a refrigerant circuit composed of a compressor (51), a condenser (52), an expansion valve (53), and an evaporator (54), and (31b) is a refrigerant circuit formed by the above refrigerant circuit. (31c) is a suction gas temperature detection means for detecting the compressor suction gas temperature in the refrigeration cycle; (31d) is the evaporator. (54), which detects the temperature inside the freezer in this embodiment.
32a) is evaporation state value detection means, and in this embodiment, a nuclear power plant pressure detector for detecting evaporation pressure is used. (32b) is a condensation state value detection means, and in this embodiment, a condensation pressure detector for detecting condensation pressure is used.

As described above, the condensing pressure detector (32b), the condenser outlet refrigerant temperature detecting means (31b), the evaporating pressure detector (32a), and the suction gas temperature detecting means (31c) installed in the refrigerant circuit or refrigeration equipment, etc. ), cooled space temperature detection means (
3] The detection data from d) is transferred to the signal collection storage device (21
) is collected and transmitted via the input I/F (43) ■/
F (46) to central control unit (11 transmissions 1/F
(Data is sent to 61. As shown in the Mollier diagram in Figure 2, the degree of supercooling (the temperature difference between the condensing temperature and the refrigerant temperature at the condenser outlet) decreases when there is a gas leak compared to during normal operation. (S C+ > S C *), degree of superheat (@temperature difference between large gas temperature and evaporation temperature), temperature difference between compressor discharge gas temperature and condensation temperature, and temperature between chamber temperature and evaporation temperature The difference increases (S H+ < S H□, S
D+ < S Dz , TDI < TDz ) This is because when the amount of refrigerant supplied to the evaporator is small, the amount of gas to evaporate is small, so the evaporation pressure decreases, and even after the evaporation is finished in the evaporator, the refrigerant gas still loses heat. This is because the suction gas into the compressor becomes superheated and the compression ratio increases (as a result, the discharge gas temperature rises.As shown in the flowchart in Figure 3, the central control unit (11 computing units 7) Convert the condensation pressure and evaporation pressure into condensation temperature and evaporation temperature, and calculate the degree of supercooling S
Calculate the C1 superheat degree SH, the temperature difference SD between the compressor discharge gas temperature and the condensation l1iI temperature, and the temperature difference TD between the internal temperature and the evaporation temperature, and find that the degree of supercooling sch<the standard supercooling degree setting value A or less and , the degree of superheating SH is greater than or equal to the reference superheat degree setting value B, the temperature difference between the discharge gas temperature and the a contraction temperature is greater than or equal to the first reference temperature difference setting value C, and the temperature difference TD between the internal temperature and the evaporation temperature is is greater than or equal to the second reference temperature difference set value, it is assumed that there is a high possibility of gas leakage, and the central controller (1) CRT (
Gas leak alarm is displayed on 21. Also ■ Supercooling degree SC
is below the standard supercooling degree setting value A.

■The degree of superheating SH is more than the reference superheat degree setting value B, ■The temperature difference SD between the discharge gas temperature and the condensing temperature is more than the first reference temperature difference setting value C, ■The temperature difference TD between the internal temperature and the evaporation temperature is the first 2. The reference temperature difference is greater than or equal to the set value.

When any three or more of the conditions (1), (2), and (2) are satisfied, it is assumed that there is a possibility of gas leakage, and a gas leak warning is displayed on the CRT f21 of the central control unit (1).

(Effect of the invention) In this invention, the condensation pressure of the refrigeration cycle formed through the compressor, condenser, expansion device 2, evaporator, etc.
Or stiff! a$1 state value detection means for detecting l1lA degree;
condenser outlet refrigerant temperature detection means for detecting the condenser outlet refrigerant temperature of the refrigeration cycle; evaporation state value detection means for detecting the evaporation pressure or evaporation temperature of the refrigeration cycle; An intake gas temperature detection means for detecting, a discharge gas temperature detection means for detecting the compressor discharge gas temperature of the refrigeration cycle, a temperature detection means for the cooled space cooled by the evaporator, and a detection signal output from each of the above detection means. is input, calculates the difference between the condensing temperature and the condenser outlet refrigerant temperature, compares this temperature difference with a preset standard supercooling degree setting value, and calculates the temperature difference between the intake gas temperature and the evaporation temperature. , Compare this temperature difference with a preset reference superheat degree setting value, calculate the temperature difference between the compressor discharge gas temperature and the 4th condensation temperature, and compare this temperature difference with the preset first superheat degree setting value.
The basis of f1! a calculation means for calculating the temperature difference between the temperature difference set value and the temperature difference between the temperature of the space to be cooled and the evaporation temperature, and comparing this temperature difference with a second reference temperature difference set value set in advance; Based on the output from the calculation means, the first condition; [Temperature difference between the above condensing temperature and the condenser outlet refrigerant temperature]
[The above standard supercooling degree set value], second condition; [the temperature difference between the compressor intake gas temperature and the evaporation temperature]] [the above standard superheating degree set value], the third condition; [the above compression the temperature difference between the discharge gas temperature of the machine and the condensing temperature] [the above-mentioned first reference temperature difference setting value], and the fourth condition [the temperature difference between the above-mentioned cooled space temperature and the evaporation temperature]] [the above-mentioned second Provide a display means that displays a gas leak alarm when all the conditions of the reference temperature difference set value] are satisfied, and also displays a gas leak warning when any three of the above four conditions are satisfied. Since we have constructed an operating condition monitoring device for refrigeration and air conditioners, we can determine the degree of subcooling, degree of superheating, and pressure of one unit from the operating condition data.

Gas leaks are determined based on multiple pieces of data such as the temperature difference between the discharge gas temperature and the condensation temperature, and the temperature difference between the cooled space temperature and the evaporation temperature, so gas leaks can be detected accurately and gas leaks can be detected. This allows you to discover failures before the system goes down.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the temperature and pressure detection position of a refrigerator or air conditioner, Figure 2 is a Mollier diagram showing gas leak conditions, and Figure 3
Fig. 4 is a calculation flowchart of a central control unit showing an embodiment of the present invention, Figs. 4 and 5 are block diagrams of a conventional operating state monitoring device for refrigeration and air conditioners, and Fig. 6 is a CRT display in the conventional device. It is an explanatory diagram. In these figures, (51) is a compressor, (52) is a condenser, (53) is an expansion device, (54) is an evaporator, and (32) is an expansion device.
b) is a condensation state 4ti detection means, (31b) is a condenser outlet refrigerant temperature detection means, (32a) is an evaporation state value detection means, (31c) is an intake gas temperature detection means, and (31a) is a discharge gas temperature detection means. , (31d) cooling space temperature detection means, (7) calculation means, and (2) display means. Note that the same reference numerals in each figure indicate the same or corresponding parts. 314 Rokami Hiropusu 5 twice-sai history hand history 31b; step number # length ro; to 楳; Formula P Temperature O History Hand j History 3h He Repulsion F
Inflammation device J2b: ;i's fall IE "guarashi; Jinmi device agent Masuo Oiwa 2nd figure 7 too

Claims (1)

[Claims] A condensation state value detection means for detecting condensation pressure or condensation temperature of a refrigeration cycle formed through a compressor, a condenser, an expansion device, and an evaporator, and a condenser outlet of the refrigeration cycle. condenser outlet refrigerant temperature detection means for detecting refrigerant temperature; evaporation state value detection means for detecting the evaporation pressure or evaporation temperature of the refrigeration cycle; suction gas temperature detection means for detecting the compressor intake gas temperature of the refrigeration cycle. , discharge gas temperature detection means for detecting the compressor discharge gas temperature of the refrigeration cycle;
Cooled space temperature detection means cooled by the evaporator;
Using the detection signals output from each of the detection means as input, calculating the temperature difference between the condensing temperature and the condenser outlet refrigerant temperature, and comparing this temperature difference with a preset standard supercooling degree set value,
Calculate the temperature difference between the suction gas temperature and the evaporation temperature, compare this temperature difference with a preset standard superheat degree setting value, calculate the temperature difference between the compressor discharge gas temperature and the condensing temperature, and calculate the temperature difference. and a preset first reference temperature difference set value,
Also, calculate the temperature difference between the cooled space temperature and the evaporation temperature,
Based on the calculation means that compares this temperature difference with a preset second reference temperature difference setting value, and the output from the calculation means, the first condition; [the above condenser temperature and the condenser outlet refrigerant temperature [Temperature difference between the above-mentioned compressor suction gas temperature and evaporation temperature]> [The above-mentioned reference superheat degree set value], the second condition ; [Temperature difference between the discharge gas temperature of the compressor and the condensing temperature]> [The above-mentioned first reference temperature difference set value], and the fourth condition; [The temperature difference between the above-mentioned cooled space temperature and the evaporation temperature] >When all the conditions of [second reference temperature difference set value] are satisfied, a gas leak alarm is displayed, and when any three of the above four conditions are satisfied, a gas leak warning is displayed. 1. An operating state monitoring device for a refrigeration/air conditioner, characterized in that it is equipped with a display means for displaying.