JPH0395357A - Compressor for air conditioner - Google Patents

Abstract

PURPOSE:To make the cooling capacity variable by a method wherein a compressor with two or more cylinders is employed, and the refrigerant to be returned to two or more cylinders is controlled. CONSTITUTION:When the temperature is lower than Ts-2 deg.C, where Ts is the set temperature, a control valve 20 is kept open and a rotary compressor 10 compresses the refrigerant with two cylinders, so that a room is heated at the maximum heating capacity. A microcomputer 41 is brought in action by this operation to initialize a timer, and a sequence is repeated. When the temperature reaches Ts-2 deg.C, the control valve 20 is closed, and the rotary compressor 10 compresses the refrigerant with one cylinder, causing the heating capacity to be reduced by half. Therefore, a mild heating takes place, and the temperature gradually approaches the set temperature Ts. As this temperature control allows modulating the room temperature without stopping the rotary compressor 10, a comfortable heating control can be performed.

Description

[Detailed description of the invention] C shot 1! Purpose of I1] (Industrial Application Field) The present invention relates to a compressor for an air conditioner, and particularly relates to a compressor for an air conditioner whose heating capacity can be comfortably controlled.

(Prior art and problems to be solved by the invention) Generally, in order to comfortably control the cooling and heating capacity of an air conditioner, the compressor is controlled on and off depending on the room temperature.
j control is being carried out. This type of control is simple, but because cooling or heating is controlled in two stages based on the set temperature, temperature changes are large and comfortable air conditioning control cannot be performed. Therefore, as a method to continuously control the flow rate of refrigerant flowing through the refrigeration cycle, a variable speed inverter compressor using an inverter power supply that generates a variable frequency has been adopted to control the heating and cooling capacity.

However, with this inverter compressor, when the motor speed is increased to increase the refrigerant flow rate, the operating noise of the compressor increases, and when the motor speed is decreased to reduce the refrigerant flow rate, the compressor vibration increases. growing. Therefore, in order to control the refrigerant flow rate with this inverter compressor, the speed of the electric motor must be kept within a predetermined speed range. There was also the problem that flow rate control was limited to a certain range.

In addition, as a method of controlling the refrigerant flow rate in the pond, there is also a release method that returns part of the intermediate refrigerant compressed by the compressor to the low-pressure suction side, or this method does not use part of the compressed refrigerant. Because of this, there are problems such as loss of refrigerant flow and a decrease in efficiency, that is, a decrease in capacity.

In order to solve the above problem, the present invention uses a compressor having a plurality of cylinders, and by controlling the refrigerant that is returned to the plurality of cylinders of the compressor, the air conditioning capacity is made variable. The purpose is to seize the opportunity.

[Structure of four parts]

(Means for Solving the Problems) The present invention provides a compressor for an air conditioner that suctions and compresses refrigerant using a plurality of cylinders, including a suction pipe connected to each of the plurality of cylinders, and a suction pipe connected to each of the plurality of cylinders. a control valve provided in at least one of the control valves for controlling the amount of suction refrigerant;
It is equipped with a control device that controls this control valve according to the negative f'1:x of air, 77, ]+n.

Further, the control device is configured to perform control based on the indoor temperature or current detected by an indoor temperature detector, a negative f:f current detector of an air conditioner, or the like.

(Function) When the compressor is operated, the refrigerant is compressed by a plurality of cylinders, for example two cylinders, and this compressed refrigerant is transferred to the outdoor heat exchanger, the radial mechanism, the radial valve, the indoor heat exchanger, and the suction pipe atmosphere. The front guard is returned to the two cylinders via. Due to the circulation of this refrigerant, heat is exchanged with the room air in the room H,'IQ exchanger, and the room is heated back or heated.

When indoor heating is performed by such refrigerant action, when the indoor temperature becomes too high, the control valve is closed by the control device, and the refrigerant is compressed by one of the two cylinders. Therefore, in this refrigeration cycle, the amount of circulating refrigerant is halved and the heating capacity is reduced. Also,
When the temperature in the room reaches 1B degrees, the control valve is opened, the circulating refrigerant is returned to the normal condition, and the heating capacity is returned to the normal state.

Since such refrigerant control is performed without supporting the speed of the compressor, the compressor does not generate noise or is accompanied by vibration.

The control valve can also be controlled by the negative GI current of the air conditioner.

(Embodiment) An embodiment of the compressor for an air conditioner according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a rotary compressor 10 having two cylinders, which is an example of the compressor for an air conditioner according to the present invention. This rotary compressor 10 includes a compressor motor 14 which has a factor 12 and a rotor 13 inside a sealed metal container 11, and a compressor driven by a crank puller 1+15 attached to the rotor 13 of the electric motor 14. Mechanism 16 is housed there. This compression mechanism 16 is provided with two cylinders 17a and 17b, and these cylinders 1. 7
Inside a17b, there is a roller 1.8a1 with a phase of 180° rotated by the crankshaft 15.
8b is provided. The two cylinders 17a17b have suction pipes 19a, 19 which are branched from each other in the refrigeration cycle.
b is connected, and the refrigerant from the refrigeration cycle is sucked in by the rotation of the rollers 18a18b. Further, valves (not shown) are attached to the cylinders 17a and 17b, and the refrigerant compressed by the rotation of the rollers 18a and 18b is discharged into the closed container 11 at a phase interval of 180'.

In such a compressor 10, a control valve 20 such as a solenoid valve for opening and closing the suction pipe is attached to one of the suction pipes 19a, and the opening and closing of the control valve 20 is controlled depending on the room temperature, the load current of the air conditioner, and the like.

Note that 21 is a discharge pipe that is attached to the upper part of the closed container 11 and discharges the refrigerant to the heat exchanger of the refrigeration cycle.
22 is a terminal for supplying electric power to the stator winding 23 of the electric motor 14, and 24 and 25 are the Nakayama receivers of the crankshaft 15.

FIG. 2 shows a refrigeration cycle in which the rotary compressor 10 of FIG. 1 is replaced.

In this thawing cycle, the refrigerant compressed by the rotary compressor 10 is transferred to a four-way valve 30, an outdoor heat exchanger 31, a throttle side 32 such as a capillary tube, a throttle valve 35 equipped with a capillary tube 34, and an indoor heat exchanger. The air is circulated to the rotary compressor 10 via the four-way valve 30, suction pipes 19a and 19b.

The rotary compressor 10 and control valve 20 of such a refrigeration cycle are connected in parallel with each other as shown in FIG. 42a. 42b is controlled to open and close by a control device consisting of a microcomputer 41. The microcomputer 41 includes a temperature setting device 43 for setting the indoor temperature, a temperature detector 44 for detecting the indoor temperature, a current detector (not shown) for detecting the load current of the air conditioner, and a device for operating the air conditioner. An operation switch 45 and the like are connected. The microcomputer 41 is operated by the setting signal of the temperature setting device 43, the detection signal of the room temperature detector 44, etc., and the control output signal causes the switch 42a. The rotary compressor 10 and control valve 20 are controlled by opening and closing 42b.

The control operation of the rotary compressor 10 and the control valve 20 by the microcombinator 41 is performed according to the flowchart shown in FIG.

The case where the air conditioner is used as a heater will be explained with reference to this flowchart.

To operate the air conditioner, the operation switch 45 is turned on (S1). If the operation switch 45 is not turned on, the air conditioner is in a standby state, and if the operation switch 45 is turned on, the microcomputer 41 is activated to initialize the timer device (S2), and the suction pipe 19a is activated. Control valve 21 is opened (S3).

By starting the microcomputer 41, the microcomputer 41 adjusts the room temperature Ta detected by the room temperature alarm device 44.
(!: The set temperature Ts of the temperature setting device 43 is read (
S4). Based on this reading, it is determined whether the room temperature Ta to be heated is lower than the set temperature Ts (S5
). When the room (c) temperature Ta is lower than the set temperature Ts, the rotary compressor 10 is operated (S6), and the refrigeration cycle, that is, the air conditioner is operated for heating.

In this case, if the indoor temperature Ta is higher than the set temperature Ts, the rotary compressor 10 is not operated and the indoor heating operation is not performed (S7).

When the mouth-to-tally compressor 10 is operated, the total load of the air conditioner including this mouth-to-tally compressor 10 is read (S8). In other words, in a general household air conditioner, when the indoor temperature increases, the total load current I of the air conditioner increases, and when the indoor temperature decreases, the total load current I increases.
decreases. If this total load current I becomes, for example, 15 A or more, the indoor lM degree will increase, but on the other hand, the rotary compressor 1
0 becomes overloaded.

Therefore, it is first determined whether the total load current I is within 13A (S9), and then it is determined whether the total load current I is within 15A (S10). If it is 13 A or less in this judgment, temperature control is performed based on the indoor temperature Ta and the set temperature Ts. If the current exceeds 13A and falls within 15A, in order to prevent a drop in indoor temperature and overload of the rotary compressor 10,
The control valve 20 of the rotary compressor 10 is closed so that refrigerant is compressed in one cylinder 19b (S 1 1).
. When the control valve 20 is closed, the microcomputer 41 is activated, the timer device is initialized (S 1 2), and the above sequence is repeated.

Further, if the load exceeds 15A, the rotary compressor 10 becomes overloaded, and if the load exceeds 16A, the rotary compressor 10 becomes unable to maintain the deep overload state.This is determined (513), and the rotary compressor 10 is will be stopped (
Sl4).

In this way, the control valve 20 is controlled from the load current of the air conditioner, the refrigerant flowing through the refrigeration cycle is controlled, and the indoor temperature is comfortably controlled (see current characteristics in FIG. 5(b)).

Next, when the load current I is 13 A or less, timer control is performed so that the air conditioner, that is, the rotary compressor 10 is not started and stopped frequently.

This timer control is provided with a duration time period Tm of, for example, 3 minutes, and it is determined whether or not the rotary compressor 10 has passed this duration time period Tm (S 1 5). If this time Tm has not elapsed, the control valve 20 is held open (S16), the rotary compressor 10 is operated with two cylinders, and the air conditioner is heated. By opening the control valve 20, the reading operation of the indoor temperature Ta, etc. in the sequence described above is performed, and the operation is repeated.

When the predetermined time Tm has elapsed, the indoor temperature Ta or the set temperature T
For example, Ts-2°C, which is 2°C lower than 24°C, is compared with 22°C (S 1 7). The purpose of comparing the set temperature Ts at a lower temperature Ts-2° C. is to control the amount of refrigerant circulation without stopping the rotary compressor 10.

That is, when the temperature is below Ts-2°C, the control valve 20 remains open (S18), and the rotary pressure 11a10 is used to compress the refrigerant by the two cylinders. Therefore, the room is heated with maximum heating capacity. This operation causes the microcomputer 41 to operate and initialize the timer device (S19), and the sequence is repeated.

When the temperature exceeds Ts-2℃ (S 1 7), the control valve 2
0 is closed (S20), the rotary compressor 10 compresses the refrigerant using one cylinder, and the heating capacity is halved. Therefore, heating is performed slowly, and the indoor temperature gradually approaches the set temperature Ts.

When such temperature control is performed, the indoor temperature is controlled without stopping the rotary compressor 10, so that suitable heating control can be performed.

When the control valve 20 is closed (S20), the microcomputer 41 is activated and the timer device is activated (S21).
The following operation is repeated (see the characteristic diagram in FIG. 5(a)). By repeating this sequence, suitable heating control is performed that gradually brings the temperature closer to the set temperature Ts.

Although the above-mentioned air conditioner has been described as being used as a heater, the same operation can be performed when the air conditioner is operated as a cooler.

Furthermore, we used a solenoid valve that controls the opening and closing of the suction pipe as a control valve, but if we use a control valve that is continuously throttled depending on the room temperature and current, we can finely control its control characteristics. This allows for more comfortable temperature control.

For example, there is a control valve 50 of this type as shown in FIG. That is, the valve casing 51 has the suction pipe 5.
An operating valve 55 that controls the opening degree of the refrigerant passages 4a and 54b.
is provided so as to be movable only in the axial direction, and is screwed into a driving lever 53 of an electric motor 52 provided at the upper part of the valve casing 51 and the operating valve 55 . However, the l of Electric Iso 52! "I'Fl:" causes the operating valve 55 to move up and down, and the passage of refrigerant flowing from the suction pipe 54a to the suction pipe 54b is controlled to increase or decrease sequentially.Such a control valve 5
When 0 is used, the refrigerant is continuously controlled and air conditioning control is performed appropriately.

In addition, when controlling the control valve, if you simultaneously control the throttle valve installed in parallel with the throttle valve of the refrigeration cycle, the hunting phenomenon will not occur when switching the control valve, so refrigerant control will be smooth. It can be carried out.

In the above embodiment, a rotary compressor having two cylinders is used, but if the product permits, the number of cylinders may be increased to three or four, and these cylinders may be controlled individually.

Further, although the above embodiment is applied to a rotary compressor, the present invention can be similarly applied to a multi-cylinder reciprocating compressor.

[Effects of the Invention] The compressor for air conditioners of the present invention is provided with suction pipes connected to each of a plurality of cylinders, and at least one of the suction pipes is connected to a plurality of cylinders.
Since the two suction pipes are provided with control valves that are controlled by temperature, load current of the air conditioner, refrigerant flow rate, etc., the air conditioner can be controlled appropriately according to the load.

Further, since the temperature, the load current of the air conditioner, the refrigerant flow m, etc. are controlled by the control device of the microcomputer, it is possible to set the temperature close to the indoor set temperature.

In addition, since the compressor for an air conditioner of the present invention is combined with an inverter compressor and the speed is constant, no noise or vibration is generated when controlling the refrigerant.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a rotary compressor shown as an embodiment of the air conditioner compressor of the present invention, FIG. 2 is a general refrigeration cycle including the rotary compressor shown in FIG.
The figure is an electrical control circuit diagram for controlling the rotary compressor shown in Figure 1, Figure 4 is a flowchart showing the operation of the air conditioner compressor of the present invention, and Figures 5 (a) and (b). 6 is a four-line diagram of control characteristics when the control valve is controlled by temperature and current, and FIG. 6 is a sectional view of the electric control valve used in the rotary compressor shown in FIG. 1. 10... Rotary compressor, 11... Container, 12.
... Stator, 13... Rotor, 14... Electric motor, 1
5... Crankshaft, 16... Compression mechanism, 17a. 1
7b...Cylinder, 18a, 18b-o-ra, 1.9
a, 19b... Suction pipe, 20... Control valve, 21...
・Discharge pipe, 22...terminal, 23...stator winding, 2
4, 25...bearing, 30...four-way valve, 31...outdoor heat exchanger, 32...throttle mechanism, 33...throttle valve, 34
- Indoor heat exchanger, 40... AC power supply, 41... Microcomputer, 42a, 42b... Contacts, 43.
...Temperature setting device, 44...Room temperature detector, 45...Operation switch, 50...Control valve, 51...Valve casing, 52...Electric motor, 53...Driver, 54a, 5
4b... Suction pipe, 55... Operating valve. Let's go, acquaintance agent Kazuo Sato Figure 2 Figure 3 flash (α) (b) Figure 5

Claims (1)

[Scope of Claims] 1. A compressor for an air conditioner that suctions and compresses refrigerant using a plurality of cylinders, including a suction pipe connected to each of the plurality of cylinders, and a suction pipe provided in at least one of these suction pipes. A compressor for an air conditioner, comprising a control valve that controls the amount of refrigerant, and a control device that controls the control valve according to the load of the air conditioner. 2. The compressor for an air conditioner according to claim 1, wherein an indoor temperature detector is connected to the control device, and the control valve is controlled based on the indoor temperature. 3. The air conditioner according to claim 1, wherein a current detector for detecting a load current of the air conditioner is connected to the control device, and the control valve is controlled by the load current. compressor. 4. The compressor for an air conditioner according to claim 1, wherein the control valve is linked to control of the refrigerant flow rate of a refrigeration cycle.