KR20040026915A - Driving control method for dual reciprocating compressor - Google Patents

Abstract

PURPOSE: A method for controlling operation of a dual reciprocating compressor is provided to install two compressing units different in capacity in one compressor, thereby selectively operating the two compressing units to vary refrigerating power. CONSTITUTION: A temperature set by a user is compared with a current temperature of a refrigerator. If the current temperature requires low refrigerating power, a first motor and a first compressing unit of small capacity are operated. If the current temperature requires intermediate refrigerating power larger than the first refrigerating power, a second motor and a second compressing unit of large capacity are operated. If the current temperature requires high refrigerating power, the first and second motors, and the first and second compressing units are operated at the same time.

Description

Operation control method of dual reciprocating compressors {DRIVING CONTROL METHOD FOR DUAL RECIPROCATING COMPRESSOR}

The present invention relates to an operation control method of a dual reciprocating compressor, and in particular, by configuring two motors and two compression units in one compressor to operate both when a large cooling force is required, only one of the two when a small cooling force is required. The present invention relates to the operation control method of dual reciprocating compressors that can reduce the dead volume by changing the driving force.

In general, a reciprocating compressor using a reciprocating motor generates a moving excitation force by interrupting power supplied to a coil wound around a multi-phase stator by using a switching element. By sequentially changing the excitation state between the motor and the stator, Exercise excitation can be generated by magnetic suction.

In particular, the reciprocating compressor used in the refrigerator or the air conditioner can vary the compression ratio to the voltage applied to the motor, and thus has the advantage of controlling the cooling power according to the user's intention, It will be described in detail with reference to the drawings.

1 is a circuit diagram showing a configuration of an operation control apparatus of a general reciprocating compressor. As shown in FIG. 1, a piston is varied in a vertical motion by a voltage applied to an internal motor M according to a stroke command value. A reciprocating compressor (L.COMP) for adjusting cooling force and a voltage detector (300) for detecting a voltage generated in the reciprocating compressor (L.COMP) as the stroke is increased by an applied voltage; A current detector (200) for detecting a current applied to the reciprocating compressor (L.COMP) as the stroke is increased by an applied voltage; A microcomputer 400 for calculating a stroke from the voltage and current detected by the voltage detector 300 and the current detector 200, comparing the stroke with a stroke command value, and outputting a switching control signal according to the stroke command value; In accordance with the switching control signal of the microcomputer 400, it is composed of an electric circuit unit 100 for interrupting the AC power to the triac (Tr1) to apply a voltage to the reciprocating compression section (L.COMP), as described above. The operation of the configured conventional device will be described.

First, the reciprocating compression section (L.COMP), the piston is moved up and down by the applied voltage according to the stroke command value set by the user, thereby the stroke is variable to adjust the cooling force.

On the other hand, the triac Tr1 of the electric circuit unit 100 has an increased stroke due to a longer turn-on period due to the switching control signal of the microcomputer 400, wherein the motor M of the reciprocating compression unit L.COMP is increased. The voltage detection unit 300 and the current detection unit 200 detect the applied voltage and current applied to the microcomputer 400, respectively.

Then, the microcomputer 400 calculates a stroke using the applied voltage and current detected by the voltage detector 300 and the current detector 200, and then compares the stroke with the stroke command value and accordingly switches the control signal. Will print

That is, when the calculated stroke is smaller than the stroke command value, the microcomputer 400 outputs a switching control signal for lengthening the on-cycle of the triac Tr1 to apply the voltage to the reciprocating compressor L.COMP. To increase.

Unlike the above description, when the calculated stroke is larger than the stroke command value, the microcomputer 400 outputs a switching control signal for shortening the on-cycle of the triac Tr1 and applies it to the reciprocating compressor L.COMP. To reduce the voltage.

As a result, the stroke stroke of the reciprocating compressor L.COMP is changed by the above process, and thus the cooling force is controlled.

Figure 2 is an exemplary view showing an example of a reciprocating compressor of a conventional reciprocating compressor, the compressor mechanism of the conventional reciprocating compressor is formed in a predetermined shape and penetrates through a predetermined inner diameter therein; A piston 20 inserted into the cylinder 10 to linearly reciprocate in response to the driving force of the motor; A discharge cover 30 coupled to one side of the cylinder 10 to cover the end face of the piston 20 inserted into the cylinder 10 and the compression space P formed by the interior of the cylinder 10. )Wow; A discharge valve 40 inserted into the discharge cover 30 to open and close the compression space P of the cylinder 10; And a valve spring 50 which is supported on the inner side of the discharge cover 30 and the discharge valve 40 to elastically support the discharge valve 40, so that the top dead center of the piston 20 does not escape the inside of the cylinder. By controlling the turn-on time of the triac so as to control the stroke of the piston 20 to the desired position.

However, in the prior art operating as described above, even if the stroke length of the stroke is slightly reduced, the cold power is rapidly decreased. Therefore, when the cold force is changed by reducing the stroke distance, the cold power is reduced without greatly reducing the stroke, and thus the cold power is changed. There is a problem in that the friction loss ratio is large, and the dead volume increases, thereby decreasing the efficiency.

Therefore, the present invention was devised to solve the above problems, and when two compressors having different capacities in one compressor are configured and a large cooling force is required, both of them are operated, and a small cooling force, a small cooling force and a large cooling force are operated. This invention relates to the operation control method of a dual reciprocating compressor that allows the variable cold power to be changed by reducing the friction loss ratio and the dead volume when the cold power is changed by operating only one of the two when cold power is required.

1 is a circuit diagram showing a configuration for the operation control device of a conventional reciprocating compressor.

2 is an exemplary view showing an example of a reciprocating compression unit of a general reciprocating compressor.

Figure 3 is a flow chart showing the operation control method of the dual reciprocating compressor of the present invention.

Figure 4 is an exemplary view showing the configuration of the present invention dual reciprocating compressor.

*** Explanation of symbols for main parts of drawing ***

4a and 4b: first and second compressors 41a and 41b: first and second motors

51a and 51b: first and second discharge valves 52a and 52b: first and second cylinders

53a, 53b: 1st, 2nd piston 401a, 401b: 1st, 2nd compression mechanism part

In order to achieve the above object, the present invention provides a dual reciprocating compressor comprising dual motors and compression mechanisms having different capacities in one compressor. A first step of driving the first motor and the first compression unit having less capacity if the first cooling force is less than the temperature; A second step of operating a second motor and a second compression unit having a large capacity when a second cooling force in which the current temperature in the refrigerator is greater than the first cooling force is required as a result of the comparison; As a result of the comparison, when the current temperature in the refrigerator is greater than the second cooling force and a third cooling force greater than the set temperature is required, a third step of simultaneously operating the first and second motors and the first and second compression units may be used. do.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 3 is a flow chart showing the operation control method of the dual reciprocating compressor of the present invention, as shown in the dual reciprocating compressor having a dual capacity of the motor and the compression mechanism having a different capacity in one compressor, the user's set temperature and A first step of operating a first motor and a first compression unit having a small capacity when a first cooling force in which the current temperature in the refrigerator is less than the set temperature is required as a result of comparing the current temperature; A second step of operating a second motor and a second compression unit having a large capacity when a second cooling force in which the current temperature in the refrigerator is greater than the first cooling force is required as a result of the comparison; As a result of the comparison, when the current temperature in the refrigerator is greater than the second cooling force and a third cooling force greater than the set temperature is required, the third step of simultaneously operating the first and second motors and the first and second compression units is performed. Referring to the operation and operation of the present invention configured as described in detail as follows.

Referring to the operation and operation of the present invention through an exemplary view showing the configuration of the apparatus to which the operation control method of the dual reciprocating compressor is applied as follows.

Figure 4 is an exemplary view showing the configuration of the dual reciprocating compressor of the present invention, as shown in the first motor 41a and the first compression mechanism 401a having a small capacity, the second motor 41b having a large capacity and The second compression mechanism portion 401b is configured in one compressor.

First, in maintaining the temperature in the refrigerator at a temperature set by the user, the temperature sensor detects the temperature in the refrigerator and compares it with the user's set temperature.

At this time, when the temperature in the refrigerator is higher than the set temperature of the user and requires less cooling power, the temperature in the refrigerator is set to the set temperature by driving the first compressor 4a having a smaller capacity with the first motor 41a and 11. Keep it.

As a result of sensing the temperature in the refrigerator, when the temperature in the refrigerator is greater than the cold power less than the user's set temperature and requires less cooling power than the large constant cold power, the second motor 41b is driven to operate the second cylinder 52b. The temperature in the refrigerator is maintained at the set temperature due to the constant stroke distance of the second piston 53b inserted into the linear reciprocating motion.

As a result of sensing the temperature in the refrigerator, when the temperature in the refrigerator is higher than the set temperature of the user by a certain temperature and a large cooling force is required, that is, when the user selects the quenching mode, the first and second compressors 4a and 4b may be used. The cooling force is varied by driving the second motors 41a and 41b.

Here, since the capacities of the first compressor 4a and the second compressor 4b are different, the stroke stroke distances of the first and second pistons 53a and 53b may vary the cooling force in a constant state.

Therefore, the present invention repeats the process as described above to maintain the temperature in the refrigerator at a user set temperature.

As described in detail above, in the present invention, two stroke compressors of different capacities are provided in a state where the stroke length is constant, and when both of them have a large cooling force (quick cooling), both of them are operated. In the case of the need for medium to high cold power, it is possible to increase the efficiency by reducing the friction loss ratio and the dead volume when the cold power is changed by selecting only one of the two.

Claims (1)

In a dual reciprocating compressor comprising dual motors and compression mechanisms having different capacities in one compressor, when the user's set temperature is compared with the present temperature, the capacity of the first refrigerator when the temperature in the refrigerator is lower than the set temperature is required. A first step of driving the small first motor and the first compression section; A second step of operating a second motor and a second compression unit having a large capacity when a second cooling force in which the current temperature in the refrigerator is greater than the first cooling force is required as a result of the comparison; As a result of the comparison, when the current temperature in the refrigerator is greater than the second cooling force and a third cooling force greater than the set temperature is required, a third step of simultaneously operating the first and second motors and the first and second compression units may be used. Operation control method of a dual reciprocating compressor.