JPS62108947A - Compressor control device of heat-pump type air conditioner - Google Patents

Abstract

PURPOSE:To protect a compressor with fine lubricating performance being maintained by converting the frequency of an ordinary commercial power source into necessitated frequency after each signal for bearing temp., rotating speed, etc. in addition to a detected room temp. is included. CONSTITUTION:Room temp. (t), compressor bearing temp. TS, compressor lubricating temp. TO, and a compressor rotating speed N are detected by a temp. sensor 9, a thermister 10, a thermister 11, a rotating speed sensor 12 respectively. When there is a difference between detected temp. t and the setting temp. tO, supplied frequency is selected to bring t near to tO. When t is nearly equal to tO, the previous frequency is kept. After TS/TO is compared with a setting value K, supplied frequency is the same as before in case of TS/TO<K. In case of TS/TO>=K, the case is considered to be just before seizure and after N is compared with the setting rotating speed NO, supplied frequency is determined to frequency corresponding to a rotating speed N+n (n: finely cut constant) in case of N<NO. In case of N>=NO, supplied frequency is fixed to frequency corresponding to a rotating speed N-n. A frequency conversion part receives said changes to convert the frequency of an ordinary power source into necessitated frequency and applies it to a compressor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides compressor control for a heat pump type air conditioner in which the rotational speed of the compressor is controlled by frequency conversion control according to the air conditioning load; It is related to the device.

2. Description of the Related Art A generally known variable capacity air conditioner using frequency conversion type compressor rotation speed control is disclosed in Utility Model Application Publication No. 57-14, for example.
As shown in Publication No. 4326, the rotation speed of the compressor is changed by converting the frequency of the compressor power supply,
At the start-up stage, high-speed rotation is used to quickly reach the set temperature, and the capacity required by the room temperature setting of the indoor unit is supplied at an appropriate rotation speed. This makes it possible to reduce overall power consumption and maintain required air conditioning conditions.

Problems to be Solved by the Invention However, with only such compressor rotational speed control, the compressor rotational speed ranges widely depending on the indoor heat load and the outside air condition. For example, in the high speed rotation range, oil Due to a lack of lubricating oil due to an increase in the discharge amount, an increase in the amount of frictional heat, etc., the temperature of the sliding parts of the compressor rises, making it more likely that the lubricating oil will deteriorate and seize. Furthermore, even in the low-speed rotation range, the lubricating oil supply ability decreases, resulting in a lubricating oil shortage, which is likely to cause seizure.

In view of the problem described in t, the present invention is a compressor control device for a heat pump type air conditioner, which aims to improve compressor control by frequency conversion control, maintain the lubrication performance of the compressor, and protect the compressor. It provides:

Means for Solving the Problems In order to solve the above problems, the compressor control device for a heat pump air conditioner according to the present invention includes a room temperature detection means for detecting room temperature and a room temperature setting device as shown in FIG. a room temperature setting means for inputting and comparing the sub-outputs of the room temperature detection means and the room temperature setting means, and a frequency for determining the deficient frequency amount to be supplied to the compressor drive motor based on the signal from the comparison calculation means. a determining means, a set value storage means (I) storing a set compressor rotation speed NO and a compressor rotation speed increment width n;
A compressor rotation speed detection means for detecting the compressor rotation speed N, a compressor bearing temperature detection means for detecting the compressor bearing temperature TS, and a compressor lubricating oil temperature detection means for detecting the compression 1finZ lubricating oil temperature T□. , an output TS from the compressor bearing temperature detection means and an output TO from the compressor lubricating oil temperature detection means.
a calculation means for calculating the ratio TS/TQ, a set value storage means (If) that stores the ratio TS/TO in advance as a setting MfK, and a set value storage means (II) for calculating the ratio TS/TO by the calculation means and the set value storage means (II). Comparison means for comparing the set value K ([
), a comparison means (I) for comparing the output NO from the set value storage means (I) and the output N from the compressor rotation speed detection means, output means (I
), and if TS/TO≧, the frequency f determined by the frequency determining means is ignored, and N<
When H□, a signal is output that makes the frequency supplied to the compressor drive motor a frequency corresponding to N + n in rotation speed,
an output means (II) for outputting a signal that makes the supplied frequency a frequency corresponding to N - n in rotational speed when NO; and a frequency converter for receiving the output signal of the output means (I) or (II). It is composed of converting means.

Effects With the configuration described in 1, the compressor control device of the present invention can reduce the overall power consumption by supplying the capacity according to the required air conditioning conditions at an appropriate rotation speed, and can operate in the high speed rotation region or the low speed rotation region. It is possible to prevent the temperature rise of the sliding parts of the compressor due to lack of lubricating oil in Since the temperature change of the sliding part (which is referred to as the compressor bearing part in the present invention) in response to the change in oil temperature can be detected, the compressor can be protected from seizure.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows an example of a heat pump type air conditioner equipped with the compressor feed i1] device of the present invention.

In Fig. 2, 1 is a heat pump type air conditioner,
A compressor 2, an indoor heat exchanger 3, a throttle device 4, an outdoor heat exchanger 5, a four-way valve 6, an indoor fan 7, and an outdoor fan 8 constitute a refrigeration cycle. A temperature sensor 9 is disposed in the indoor heat exchanger 3 as a room temperature detection means. Reference numeral 10 denotes a bearing temperature detection means of the compressor 2, which has a thermistor built in near the bearing portion. Reference numeral 11 denotes lubricating oil temperature detection means for the compressor 2, and a thermistor is disposed at the inner bottom of the compressor casing. Further, reference numeral 12 is a rotation speed detection means of the compressor 2, which uses a rotation sensor. The signals of the room temperature, bearing temperature, and rotation speed detected by these detection means are taken into the compressor control device 13. The compressor control device converts general commercial power input from a power source (not shown) into a necessary frequency power, and applies it to the compressor 2 to operate according to the indoor load.

Next, the compressor control device will be explained in detail with reference to the flowchart shown in FIG. The set compressor rotation speed NO is used to determine whether the compressor in operation is in a high speed rotation range or a low speed rotation range, and is set in a medium speed rotation range. The compressor rotational speed increment width n is during the rotational speed change when the rotational speed is brought to the safe side to protect the compressor. , the set value is for determining whether the compressor sliding part is in the seizure area. When approaching the burn-in state, 'I! II
Since the temperature of the I receiving part rises rapidly compared to the lubricating oil temperature, the ratio T between the compressor bearing temperature TS and the compressor lubricating oil temperature TO
S/TO increases rapidly. Focusing on this point, for example, the value of T'S/TO at the safety limit may be determined as K. The set value NO, n is set in advance (step 1 in FIG. 3). The room temperature set value to is set at an arbitrary indoor temperature using the operating section (not shown) of the indoor unit (step 2 in FIG. 3).

Room temperature t, compressor bearing temperature TS, compressor lubricating oil temperature T□,
The compressor rotation speed N is determined by a temperature sensor 9 and a thermistor 10, respectively. It is detected by the thermistor 11 and rotation sensor 12 (step 3 in FIG. 3). The detected room temperature t is the room temperature set value t
o (step 4 in Figure 3), and the detected room temperature t
If there is a difference between the set room temperature tQ and the set room temperature tQ, the frequency of supply to the compressor 2 is selected so that the room temperature t approaches the set room temperature to.

Further, when the room temperature t is approximately equal to the set room temperature to, the previous supply frequency is maintained (step 5 in FIG. 3). next,
Ratio TS of compressor bearing temperature TS to compressor lubricating oil temperature TO
Compute TO (step 6 in FIG. 3). The ratio TS/
The value of TO is compared to the set value (step 7 in Figure 3).
). When TS/TOK is detected, it is determined that there is no risk of seizure, and a signal is output to set the frequency supplied to the compressor 2 to the frequency determined in step 5 above (step 8 in Fig. 3).
.

When TS/TO≧, it is determined that seizure is on the verge of occurring, and the frequency determined in step 5 is ignored and the compressor rotational speed is brought to the safe side. First, it is determined whether the compressor is in the high speed rotation range or the low speed rotation range by comparing the detected compressor rotation speed N and the set compressor rotation speed NO (step 9 in Fig. 3). . When N<H
Move it to the high speed side by that amount. Therefore, a signal is output that makes the frequency supplied to the compressor 2 a frequency corresponding to the rotational speed N + n. When N≧NO, it is determined that the rotation speed is in the high speed range, and conversely, in order to bring the rotation speed to the low speed side by n minutes, the frequency supplied to the compressor 2 is set to correspond to the rotation speed N - n, or to a '6 wave number. A signal is output (step 10 in FIG. 3). IJn
The signal output in step 8o is input to the frequency converter, converts the general commercial power source into a predetermined frequency, and applies it to the compressor 2 (step 11 in FIG. 3).

As described above, the compressor control device repeats a series of operations from the start of operation.

4C. In the above embodiment, a temperature sensor is used as the room temperature detection means, a thermistor is used as the compressor bearing temperature detection means and the compressor lubricating oil temperature detection means, and a rotation sensor is used as the compressor rotation speed detection means. However, it is clear that these types and their installation positions are not limited to this example.

Effects of the Invention As described above, the heat pump type air conditioner of the present invention
The compressor control device of the C machine includes a room temperature detection means for detecting the room temperature, a room temperature setting means for setting the room temperature, and a ratio 1 time difference by inputting the outputs of both the room temperature detection means and the room temperature setting means. a frequency determining means for determining the frequency f to be supplied to the compressor drive motor based on the signal from the ratio throttle calculating means; and a set value memory storing a set compressor rotation speed NO and a compressor rotation speed increment width n. means (I), a compressor rotation speed detection means for detecting the compressor rotation speed N, and a compressor bearing temperature 'r3.
compressor bearing temperature detection means for detecting compressor lubricant temperature TO; compressor lubricant temperature detection means for detecting compressor lubricant temperature TO; a calculation means for calculating the ratio TS/TQ of the output T□, a set value storage means (It) that stores the ratio TS/TO as a set value in advance, and a ratio TS/TO and set value stored by the calculation means. Comparison means (I) for comparing the set value K of the means (It) and the output NO from the set value storage means (I), ! : Comparing means (II) for comparing the output N from the compressor rotation speed detecting means; and comparing means (I) for comparing the output frequency N from the compressor rotation speed detecting means; output means (I) for outputting a signal with the determined frequency from the determining means; and TS/T.
If O≧, the frequency f determined by the frequency determination means is ignored, and the ratio control means (I1) sets the frequency supplied to the compressor drive motor to a frequency corresponding to N+n in terms of rotational speed. an output means (I1) that outputs a signal that makes the supplied frequency a frequency corresponding to N - n in rotational speed when N≧H□; and the output means (I)
It is equipped with a frequency conversion means that converts the frequency by receiving the output signal of (It), which reduces overall power consumption, maintains the required air conditioning conditions, and maintains the lubrication performance of the compressor. This has the effect of protecting the compressor from seizure.

[Brief explanation of drawings]

Fig. 1 is a complaint correspondence diagram showing the compressor control device for a heat pump type air conditioner according to the present invention as a function realizing means;
The figure is a refrigerant circuit diagram showing an example of a heat pump type air conditioner realizing the same device, and FIG. 3 is a flow chart diagram explaining the same device in detail. 1...Heat pump type air conditioner, 2...
... Compressor, 9 ... Temperature sensor (room temperature detection means), 10 ... Thermistor (compressor bearing temperature detection means), 11 ... Thermistor (compressor lubrication oil temperature detection means), 12... rotation sensor (compressor rotation speed detection means), 13... compressor control device. Name of agent: Patent attorney Toshio Nakao and one other name
1 Diagram No-- Beat Pon f to T 1 question Waiso 2 ---i pain base 9-11 love;
1 Figure 3 of Aircraft A stabilization system

Claims (1)

[Claims] A room temperature detection means for detecting the room temperature, a room temperature setting means for setting the room temperature, a comparison calculation means for inputting and comparing the outputs of both the room temperature detection means and the room temperature setting means, and a signal from the comparison calculation means to control the compressor. A frequency determining means for determining the frequency f to be supplied to the drive motor, and a set value storage means (for storing the set compressor rotation speed N_O and the compressor rotation speed increment width n)
I), a compressor rotation speed detection means for detecting the compressor rotation speed N, a compressor bearing temperature detection means for detecting the compressor bearing temperature T_S, and a compressor lubricating oil temperature for detecting the compressor lubricating oil temperature T_O. a detection means, a calculation means for calculating a ratio T_S/T_O of the output T_S from the compressor bearing temperature detection means and the output T_O from the compressor lubricating oil temperature detection means;
A set value storage means (II) which stores the ratio T_S/T_O in advance as a set value K, and a ratio T by the arithmetic means.
Comparing means (I) for comparing _S/T_O and the set value K of the set value storage means (II), and an output N_O from the set value storage means (I) and an output N from the compressor rotation speed detection means. Comparison means for comparison (II) and said comparison means (I)
output means (I) for outputting a signal that sets the frequency supplied to the compressor drive motor to the frequency f determined by the frequency determination means when T_S/T_O<K; and T_S/T_O≧
If K, the frequency f determined by the frequency determining means is ignored, and the comparing means (II) generates a signal that sets the frequency supplied to the compressor drive motor to a frequency corresponding to N+n in terms of rotational speed when N<N_O. an output means (II) for outputting a signal that makes the supplied frequency a frequency corresponding to N-n in rotational speed when N≧N_O; and an output means (II) for receiving an output signal from the output means (I) or (II). A compressor control device for a heat pump air conditioner, comprising a frequency conversion means for converting a frequency.