KR20170140605A - Method for counting low pressure of compressor - Google Patents

Abstract

The present invention relates to a method for counting a low pressure of a compressor and, specifically, to a device for preventing unnecessary repetition of driving and stopping when the pressure of a compressor is temporarily decreased due to driving environment and at the beginning of driving the compressor. The method for counting a low pressure of a compressor comprises: an initial delay step (S20); a detection step (S30) detecting a refrigerant pressure (RP) in a pipe connected to the compressor; a pressure determining step (S40); a count step (S50) of counting a total error number (TEN); an error number determining step (S60) of determining whether the TEN is less than a standard total error number (STEN); a repetition delay step (S70) of returning to the detection step (S30) after delaying a predetermined repetition delay time (RDT) in a case that the TEN is less than the STEN; a warning step (S80) driving a warning unit in a case that the TEN is equal to or is greater than the STEN; and a reset step (S90) of returning to the detection step (S30) after resetting the TEN when the pressure of a refrigerant is equal to or is greater than the SRP.

Description

[0001] The present invention relates to a method for counting low pressure of a compressor,

The present invention relates to a low pressure counting method for a compressor, and more particularly, to a method for forcibly stopping a compressor in order to prevent damages due to pressure drop of a refrigerant in a piping connected to the compressor, The present invention relates to an apparatus for effectively preventing damage to a compressor as well as a market competitiveness and ease of use for a compressor.

BACKGROUND ART Generally, a compressor is a mechanical element that converts a fluid or gas into a high pressure, and is widely used in a cooling cycle or a heat pump that compresses and circulates refrigerant.

Such a compressor is provided in a duct through which refrigerant circulates. However, if the pressure of the refrigerant in the duct is lowered due to a fatal cause such as leakage of refrigerant or clogging of the duct, A system for detecting and monitoring the pressure of the refrigerant in the pipeline has been widely used in order to prevent the compressor from being damaged.

Such a compressor protection system automatically stops the operation of the compressor when the refrigerant pressure in the duct is lower than the reference value for the above reasons, and drives the compressor again when it is recovered above the reference value.

However, in such a case, it is necessary to stop the compressor to stop the compressor in order to prevent damage to the compressor. However, in case of temporary environmental factors that do not affect the damage of the compressor, for example, The pressure of the refrigerant temporarily falls below the reference value as in the case where the temperature around the outdoor unit is relatively low.

In this case, since the stopping and driving of the compressor is repeatedly performed within a short time, it is not a protection of the compressor but rather a severe problem of the compressor, which is a major cause of damaging the compressor and shortening the life span. there was.

Korean Patent Registration No. 10-1545625

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a compressor capable of detecting a refrigerant pressure after a predetermined initial delay time at the time of initial operation of the compressor, It is possible to prevent the compressor from being unnecessarily driven and stopped by operating the warning or stopping the driving of the compressor only when the pressure drop is detected repeatedly for more than the reference value so that the market competitiveness and ease of use It is, of course, an object of the present invention to provide a low-pressure counting method of a compressor that can effectively prevent damage to a compressor.

The low pressure counting method of the compressor of the present invention includes an initial delaying step of delaying a predetermined initial delay time after driving the compressor; A detecting step of detecting a refrigerant pressure in a pipe connected to the compressor after the initial delaying step; A pressure determining step of determining whether the pressure of the refrigerant detected in the detecting step is equal to or higher than a predetermined reference value; A counting step of counting the cumulative number of error iterations when the pressure of the refrigerant in the pressure determining step is less than a predetermined reference value; An error repetition number determination step of determining, after the counting step, whether the cumulative error repetition number is less than a reference cumulative error repetition number; A repetition delay step of returning to the detection step after a predetermined repetition delay time delay if the cumulative error repetition number is less than the reference cumulative error repetition number in the error repetition number determination step; A warning step of driving the warning means when the number of cumulative error repetitions is equal to or greater than the reference cumulative error repetition number in the error repetition number determination step; And a resetting step of returning to the detecting step after resetting the accumulated number of error iterations when the pressure of the refrigerant in the pressure judging step is equal to or higher than a predetermined reference value.

Here, it is preferable that the user further includes a setting step of setting the initial delay time, the reference value of the refrigerant pressure, the number of reference cumulative error iterations, and the repeat delay time before the initial delay step.

In addition, after the warning step, it is preferable to additionally configure a stopping step for stopping the driving of the compressor after a predetermined stop delay time delay.

In addition, it is preferable that the user can further set a stop delay time in the setting step.

The present invention as described above detects the pressure of the refrigerant after a predetermined initial delay time at the time of initial operation of the compressor, repeatedly detects the pressure with a predetermined repetitive delay time at a temporary pressure drop according to the driving environment, It is possible to prevent the unnecessary driving and stopping of the compressor from being repeated by activating the warning or stopping the driving of the compressor only when the pressure drop is detected so that the market competitiveness and ease of use for the compressor as well as the damage to the compressor It can be effectively prevented.

1 is a flow chart illustrating a low pressure counting method of a compressor of the present invention,
2 is a flow chart showing a modification of the low-pressure counting method of the compressor of the present invention,
3 is a flow chart illustrating another variation of the low pressure counting method of the compressor of the present invention.

FIG. 1 is a flow chart showing a low pressure counting method of the compressor of the present invention, FIG. 2 is a flowchart showing a modified example of the low pressure counting method of the compressor of the present invention, and FIG. 3 is a flowchart Fig. 8 is a flowchart showing another modification of the embodiment.

The specific structure or functional description presented in the embodiment of the present invention is merely illustrative for the purpose of illustrating an embodiment according to the concept of the present invention, and embodiments according to the concept of the present invention can be implemented in various forms. And should not be construed as limited to the embodiments described herein, but should be understood to include all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Meanwhile, in the present invention, the terms first and / or second etc. may be used to describe various components, but the components are not limited to the terms. The terms may be referred to as a second element only for the purpose of distinguishing one element from another, for example, to the extent that it does not depart from the scope of the invention in accordance with the concept of the present invention, Similarly, the second component may also be referred to as the first component.

Whenever an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but it should be understood that other elements may be present in between something to do. On the other hand, when it is mentioned that an element is "directly connected" or "directly contacted" to another element, it should be understood that there are no other elements in between. Other expressions for describing the relationship between components, such as "between" and "between" or "adjacent to" and "directly adjacent to" should also be interpreted.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. It will be further understood that the terms " comprises ", or "having ", and the like in the specification are intended to specify the presence of stated features, integers, But do not preclude the presence or addition of steps, operations, elements, parts, or combinations thereof.

The low pressure counting method of a compressor of the present invention detects a pressure of a refrigerant after a predetermined initial delay time at the time of initial operation of the compressor and repeatedly detects a pressure at a predetermined repetitive delay time at a temporary pressure drop according to a driving environment It is possible to prevent the compressor from being unnecessarily driven and stopped repeatedly by activating the warning or stopping the driving of the compressor only when the pressure drop is detected repeatedly over the reference value, It is possible to effectively prevent damage to the substrate.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the low pressure counting method of the compressor of the present invention includes an initial delay step (S20) in which a predetermined initial delay time (IDT) is delayed after the compressor is driven; A detecting step S30 of detecting a refrigerant pressure RP in a pipe connected to the compressor after the initial delaying step S20; A pressure determining step (S40) of determining whether the pressure RP of the refrigerant detected in the detecting step S30 is equal to or higher than a predetermined reference value SRP; A count step (S50) of counting a cumulative error number (TEN) when the pressure RP of the refrigerant is less than a predetermined reference value (SRP) in the pressure determination step (S40); An error repetition number determination step (S60) of determining, after the counting step (S50), whether the cumulative error repeat number (TEN) is less than a reference cumulative error repeat number (STEN); After a predetermined repetition delay time (RDT) is delayed when the cumulative error iteration number TEN is less than the reference cumulative error iteration number STEN in the error repeat number determination step S60, the detection step S30 (S70); A warning step (S80) for driving the warning means when the cumulative number of error iterations (TEN) is equal to or greater than the reference cumulative error iteration number (STEN) in the error repeat number determination step (S60); If the pressure RP of the refrigerant is equal to or higher than the predetermined reference value SRP in the pressure determining step S40, the reset step S90 is performed after resetting the cumulative error iteration number TEN and then returning to the detecting step S30 .

First, the low-pressure counting method of a compressor of the present invention basically comprises a pressure detecting means which is a pressure sensor capable of detecting a pressure against refrigerant in a pipeline, based on a cooling cycle or a heat pump, A microcomputer as an arithmetic unit for performing various calculations while determining elapsed time, and an input / output device connected to the microcomputer.

Here, the pressure detecting means is provided at a proper position in the piping of the cooling cycle or the heat pump and connected to the microcomputer by wired / wireless lines. After detecting the pressure of the refrigerant under the control of the microcomputer, To the microcomputer.

The microcomputer is connected to a power supply for supplying power to the compressor, and the microcomputer may supply power to the compressor according to the control of the microcomputer, or may stop the driving by shutting off the power.

In addition, the input / output device inputs a command to the microcomputer, or displays a current state of the microcomputer. In particular, the output device preferably includes a display window. Alternatively, Various configurations are possible to recognize the current abnormal compressor operation state.

First, the initial delay step S20 is provided for a relatively long piping to cope with a phenomenon in which the pressure in the piping temporarily drops during the initial driving. That is, without immediately detecting the refrigerant pressure in the piping immediately after the compressor is driven, (IDT) after driving, and then detects the pressure of the refrigerant.

After the initial delaying step S20, the microcomputer detects the refrigerant pressure (RP) in the piping connected to the compressor through the pressure detecting means in the detecting step S30.

The pressure of the refrigerant detected by the pressure detecting means is transmitted to the microcomputer through an electrical signal.

Then, in the pressure judgment step S40, the microcomputer compares the pressure RP of the refrigerant detected by the pressure detecting means and the standard refrigerant pressure SRP with respect to the refrigerant pressure in the normal operating state.

In this pressure determination step S40, the pressure RP of the refrigerant generally detected should be equal to or higher than the reference refrigerant pressure SRP in the normal operating state, but if the temperature around the outdoor unit constituting the cooling cycle or the heat pump is relatively low The pressure of the refrigerant temporarily drops below the reference value.

Conventionally, when the pressure RP of the refrigerant is temporarily lower than the reference refrigerant pressure SRP in the normal operation state, the warning means immediately operates or the compressor is stopped.

However, in the present invention, in order to clearly distinguish whether it is a temporary pressure drop state or a state in which repair is necessarily required such as leakage of a refrigerant or clogging of a pipeline, an error count is counted at predetermined time intervals, Can be prevented.

For this, in the counting step S50, when the pressure RP of the refrigerant is lower than the predetermined reference value SRP in the pressure determining step S40, the microcomputer adds 1 to the accumulated error number TEN, That is, it counts.

Thereafter, in step S60 of determining the number of error iterations, it is determined whether the cumulative error iteration number TEN is less than a standard cumulative error number (STEN).

If it is determined in step S60 that the cumulative number of error iterations TEN is less than the cumulative number of error iterations STEN, a predetermined repetition delay time RDT (Repetition Delay) Time, and then returns to the detecting step S30.

However, if it is determined in step S60 that the number of error iterations TEN is equal to or greater than the reference cumulative error iteration number STEN, it is determined that repair is necessarily required, such as leakage of refrigerant or clogging of the channel And the warning means is driven through the warning step S80.

At this time, the warning means may consist of a display panel, a warning message that can be displayed, a warning light that can be turned on, or a speaker that can generate a warning sound.

If the pressure RP of the refrigerant is equal to or greater than the predetermined reference value SRP in the pressure determination step S40, the reset step S90 resets the cumulative error iteration number TEN, and then the detection step S30 Return.

In the reset step S90, when the pressure of the refrigerant is temporarily reduced to the error state and then the pressure returns to a pressure at which the normal operation is performed again, the cumulative error repeat number TEN is reset, .

2, prior to the initial delay step S20, the user sets the initial delay time IDT, the reference value SRP of the refrigerant pressure, the reference cumulative error repeat number STEN, And a setting step S10 for setting the repeat delay time RDT.

That is, a separate setting step S10 is initially performed and the user inputs the initial delay time IDT, the reference value SRP of the refrigerant pressure in the normal operation state, STEN), and the repeat delay time (RDT), or to change the set values that have already been set.

3, after the warning step S80, a stop step S100 for stopping the operation of the compressor after a predetermined delay time (SDT) Most preferably, it is further configured.

In the stopping step S100, the user attempts to recognize that the pressure of the refrigerant has decreased through the warning step S80. However, in order to prevent the compressor from being damaged due to the user's failure to recognize the pressure,

That is, when the compressor is automatically stopped within a predetermined stop delay time (SDT) although the user informs the user that the pressure of the refrigerant has decreased through the warning step S80, the compressor is automatically stopped .

When the stop step S100 is added, it is preferable that the user can additionally set the stop delay time SDT in the setting step S10.

Hereinafter, the operation of the present invention will be described with reference to FIG.

In the low-pressure counting method of the compressor of the present invention, the first setting step S10 is started.

In the setting step S10, the user sets the initial delay time IDT, the refrigerant pressure reference value SRP in the normal operation state, the reference cumulative error repeat number STEN, the repeat delay time RDT, and the stop delay time SDT, To the microcomputer.

For example, it is assumed that the initial delay time IDT is 15 seconds, the refrigerant pressure reference value SRP in the normal operation state is 1 kg / cm2, the reference cumulative error repetition number (STEN) is 3 times, (RDT) is set to 5 minutes, and the stop delay time (SDT) is set to 1 minute.

These setting values are for illustrative purposes only, and the present invention is not limited thereto. It is obvious that the user can change the setting values to desired values.

After the setting step S10, the initial delay time (IDT) is delayed for 15 seconds in the initial delay step S20. This is because the pressure of the refrigerant at the time of initial operation of the compressor in the relatively long piping is temporarily low, So that the pressure is not detected.

After the initial delaying step S20, the refrigerant pressure RP in the piping connected to the compressor is detected through the pressure detecting means in the detecting step S30.

The pressure of the refrigerant detected in the detecting step S30 may be in the following three cases.

(State 1) If the refrigerant pressure is equal to or higher than the normal refrigerant pressure reference value (normally RP = SRP)

(Status 2) If the temperature around the outdoor unit is relatively low and the pressure of the refrigerant is temporarily lowered and the repair is not required because the refrigerant pressure is lower than the normal operating refrigerant pressure reference value (temporarily RP <SRP but then switched to RP? SRP)

(State 3) If the refrigerant pressure is below the refrigerant pressure reference value under normal operation due to leakage of the refrigerant or clogging of the pipeline, and repairs are required (continuously RP <SRP)

- State 1

In the pressure determination step S40, since the pressure RP of the refrigerant detected in the detecting step S30 is equal to or greater than 1 kg / cm2 which is the predetermined reference value SRP, the accumulated error repeat number TEN is reset through the reset step S90 After resetting, the process returns to the detecting step S30.

Accordingly, the low pressure counting method of the compressor of the present invention repeatedly detects the pressure of the refrigerant and monitors the pressure state of the refrigerant in real time.

- State 2

In the pressure determining step S40, since the pressure RP of the refrigerant detected in the detecting step S30 is less than 1 kg / cm2, which is the predetermined reference value SRP, the accumulated error repeat number TEN is calculated through the counting step S50 1 is added, and the count is counted from zero to one.

Thereafter, in the error repetition number determination step S60, it is determined whether the cumulative error repetition number TEN is less than three times the reference cumulative error repetition number STEN.

If it is determined in step S60 that the cumulative number of error iterations TEN is less than the cumulative number of error iterations STEN, it is determined that the repeated delay time RDT is delayed by 5 minutes through the repeated delay step S70 Then, the process returns to the detection step S30.

That is, after 5 minutes, which is the repeat delay time (RDT), the pressure of the refrigerant is detected again through the detecting step S30, but the pressure RP of the refrigerant detected in the detecting step S30 continues to be lower than the predetermined reference value SRP ), The cumulative error repeat number TEN is incremented by 1 in the count step (S50), and counted from one to two times.

Thereafter, in the error repetition number determination step S60, it is determined whether the cumulative error repetition number TEN is less than three times the reference cumulative error repetition number STEN.

Since the cumulative error iteration number TEN is less than the reference cumulative error iteration number STEN in the error repeat number determination step S60, the repeat delay time RDT 5 minutes is delayed again through the repeat delay step S70 , The process returns to the detection step S30.

The refrigerant pressure detected again in the detecting step S30 after 5 minutes which is the repetitive delay time RDT but the pressure RP of the refrigerant detected in the detecting step S30 is 1 kg / Cm2, the accumulated error repeat number TEN is reset through the reset step S90, and then the process returns to the detection step S30.

Thereafter, the pressure of the refrigerant is monitored by repeating the detection of the pressure of the refrigerant in real time.

That is, in the present invention, when the temporary pressure is decreased according to the driving environment and the pressure is repeatedly detected at a predetermined repetitive delay time and is switched to a normal state without stopping the compressor immediately, , It is possible to prevent repeated unnecessary driving and stopping of the compressor.

- State 3

In the state 3, the cumulative error repetition number TEN is accumulated twice in the state 2 described above, and after repeating the repetitive delay time RDT again for 5 minutes through the repetitive delay step S70, S30) are the same, so that redundant description thereof will be omitted.

However, if the pressure of the refrigerant detected in the detecting step S30 is detected again after the repeating delay time RDT of 5 minutes, the pressure RP of the refrigerant detected in the detecting step S30 is the predetermined reference value SRP If less than 1 kg / cm2 is maintained, 1 is added to the accumulated error repeat number TEN through the count step (S50) to count three times from two times.

Thereafter, in the error repetition number determination step S60, it is determined whether the cumulative error repetition number TEN is less than three times the reference cumulative error repetition number STEN.

At this time, since the cumulative number of error iterations TEN is equal to or more than three times the reference cumulative error iterations STEN in the error repeat number determination step S60, the warning means is driven through the warning step S80.

After the warning step S80, if the driving of the compressor is not stopped after one minute delayed by the predetermined stop delay time SDT, the driving of the compressor is forcibly stopped through the stopping step S100, .

That is, in the present invention, when the pressure is repeatedly detected with a predetermined repetition delay time and the pressure drop is detected repeatedly over the reference value, it is determined that repair is required, such as leakage of refrigerant or clogging of the channel, Or the compressor is forcibly stopped after a predetermined time elapses.

Therefore, the low-pressure counting method of the compressor of the present invention is an invention having the following excellent advantages.

First, by detecting the pressure of the refrigerant after a predetermined initial delay time at the time of initial operation of the compressor, it is possible to drive the compressor irrespective of the decrease in refrigerant pressure at the initial stage of driving, which may occur in a relatively long piping.

Secondly, when the pressure is temporarily deteriorated according to the driving environment, the pressure is repeatedly detected with a predetermined repetition delay time, and only when the pressure drop is detected repeatedly over the reference value, the alarm is activated or the compressor is stopped, And it is possible to prevent the stoppage from being repeated.

Third, by detecting the pressure of the refrigerant repeatedly in real time in the normal operating state, it is possible to quickly cope with the pressure drop of the refrigerant, which may occur at any time.

The above embodiment is an example for explaining the technical idea of the present invention specifically, and the scope of the present invention is not limited to the above-mentioned drawings or embodiments.

S10: Setting step S20: Initial delay step
S30: Detecting step S40: Pressure judging step
S50: Count step S60: Error repeat number judgment step
S70: Repeat delay step S80: Warning step
S90: Reset step S100: Stop step

Claims (4)

An initial delay step of delaying a predetermined initial delay time after driving the compressor;
A detecting step of detecting a refrigerant pressure in a pipe connected to the compressor after the initial delaying step;
A pressure determining step of determining whether the pressure of the refrigerant detected in the detecting step is equal to or higher than a predetermined reference value;
A counting step of counting the cumulative number of error iterations when the pressure of the refrigerant in the pressure determining step is less than a predetermined reference value;
An error repetition number determination step of determining, after the counting step, whether the cumulative error repetition number is less than a reference cumulative error repetition number;
A repetition delay step of returning to the detection step after a predetermined repetition delay time delay if the cumulative error repetition number is less than the reference cumulative error repetition number in the error repetition number determination step;
A warning step of driving the warning means when the number of cumulative error repetitions is equal to or greater than the reference cumulative error repetition number in the error repetition number determination step;
And a resetting step of resetting the cumulative number of error iterations and returning to the detecting step when the pressure of the refrigerant in the pressure determining step is equal to or higher than a predetermined reference value.
2. The method according to claim 1, further comprising a step of setting a user's initial delay time, a reference value of a refrigerant pressure, a reference cumulative error repeat number, and a repeat delay time before the initial delay step. Way.
3. The low-pressure counting method of a compressor according to claim 2, further comprising a stop step of stopping the operation of the compressor after a predetermined stop delay time delay after the warning step.
The low-pressure counting method of a compressor according to claim 3, wherein the setting step further sets a stop delay time by a user.

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