JP2004204734A - Gas compressor and air conditioning system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect an abnormal rise in temperature in a pulley bearing without delay. <P>SOLUTION: A temperature sensor 50 is attached in contact with the inner ring 43b of the bearing 43 so that the temperature of the ring 43b is transmitted to the sensor 50 speedily. The angular position for attaching the sensor 50 is located where a bearing load by belt tension becomes maximum. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gas compressor that receives compression power from outside via a belt and a pulley.
[0002]
[Prior art]
Many of vane rotary type gas compressors, scroll type gas compressors, swash plate type gas compressors and the like used for car air conditioners and gas heat pump systems receive driving power from outside via belts and pulleys.
[0003]
The pulley on the gas compressor side is normally rotatably supported by a pulley bearing mounted on a compressor frame or the like concentrically with the rotor shaft. The pulley is connected to the rotor shaft directly or via an electromagnetic clutch. A belt is stretched between the pulley on the prime mover side and the pulley on the gas compressor side. The rotational power of the prime mover is transmitted to the belt and the pulley on the gas compressor side to rotationally drive the rotor shaft.
[0004]
Here, the structure of the gas compressor will be outlined with respect to the vane rotary type gas compressor with an electromagnetic clutch shown in FIG. The vane rotary type gas compressor includes a compressor main body 1, a gas suction unit 2, a gas discharge unit 3, and a rotary power introduction unit 4.
[0005]
The compressor body 1 has a cylinder chamber 11 having a non-circular cross section, a rotor 12 rotatable in the cylinder chamber 11, and a rotor inserted and fixed in a center hole of the rotor 12, and both sides of the rotor supported by bearings 13 and 14. The shaft 15 has vanes 16 which are slidably inserted into a plurality of vane grooves substantially radially engraved on the rotor 12 to define the cylinder chamber 11 into a plurality of compression chambers.
[0006]
The gas suction section 2 has a suction chamber 22 that sucks a gas such as a refrigerant gas from a suction port 21 and sends the gas to the compression chamber.
[0007]
The gas discharge section 3 has a discharge chamber 32 that receives a compressed gas discharged from the compression chamber and discharges the compressed gas from a discharge port 31.
[0008]
The rotational power introducing section 4 includes an electromagnetic clutch driven section 41 attached to a projection 15a of the rotor shaft 15 projecting from the bearing 14, and a pulley bearing 43 attached to a boss inner ring mounting outer periphery 42a of the front head 42. And an electromagnetic clutch driving unit 44 fitted to the outer ring 43a of the bearing 43 and rotatable together with the outer ring 43a. The driving unit 44 is provided with a pulley 45. Reference numeral 46 denotes an annular core, in which an exciting coil 46a is provided. The core 46 is inserted into the annular cavity 45a of the pulley 45, and is fixed to the boss inner ring mounting step end face 42b of the front head 42 so as not to rotate.
[0009]
The inner ring 43b of the pulley bearing 43 is prevented from coming out of the front head 42 by a snap ring 47 fitted in an annular groove of the inner ring mounting outer periphery 42a. The pulley 45 is prevented from coming out of the pulley bearing 43 by a snap ring 48 fitted in an annular groove of the center hole 45b of the pulley 45.
[0010]
Although not shown, a belt is stretched between the pulley 45 and the pulley on the prime mover side.
[0011]
The driven portion 41 includes an amateur friction plate 41a and the like.
[0012]
Since the rotary power introducing section 4 is configured as described above, the pulley 45 on the gas compressor side is constantly rotating by the rotary power of the prime mover.
[0013]
When the exciting coil 46a is excited, the amateur friction plate 41a is attracted to the end face 45c of the pulley 45. By this suction, the electromagnetic clutch driving unit 44 and the driven unit 41 are integrated, and the rotor shaft 15 and the rotor 12 rotate together with the pulley 45.
[0014]
In the case of a gas compressor in which a pulley is directly connected to a rotor shaft, the rotor shaft and the rotor are constantly rotating.
[0015]
Incidentally, a large radial load is applied to the pulley bearing 43 in one direction due to belt tension. When the pulley bearing 43 rotates under a large radial load, the temperature of the bearing increases.
[0016]
Conventionally, during the operation of the gas compressor, the electromagnetic clutch may be burnt or the belt may be broken. When pursuing the cause, the following phenomenon was found.
[0017]
When the pulley bearing 43 generates more heat than usual due to poor lubrication, wear, overload, etc., and becomes abnormally high in temperature, the heat is transmitted to the core 46 of the electromagnetic clutch surrounding and outside the bearing, and the core 46 is also heated to high temperature. As a result, the mold may melt and short-circuit of the wiring may occur. Also, the temperature near the coil 46a and the end surface 45c of the pulley 45 becomes high, and the magnetomotive force of the electromagnetic clutch decreases.
[0018]
When the magnetomotive force is reduced, the attraction force between the pulley 45 and the amateur friction plate 41a is weakened, a slip is generated between the pulley 45 and the amateur friction plate 41a, and a spark is generated. Destroy parts. In this state, the components in the driven portion 41 come into contact with each other, sparks are generated due to frictional heat, and the temperature of the core 46 is further increased. Further, the rotor shaft 15 does not rotate normally.
[0019]
If the temperature of the core 46 exceeds 200 ° C., the softening and melting of the mold occurs. Therefore, if the temperature rise is detected at a temperature lower than the temperature, this obstacle can be avoided in advance.
[0020]
In the case of a rotor shaft / pulley direct connection type that does not use an electromagnetic clutch, the above obstacle does not exist. However, the pulley bearing itself may be broken due to abnormal heat generation in any of the rotor shaft / pulley direct coupling type and the electromagnetic clutch coupling type.
[0021]
If the pulley bearing 43 is finally locked due to the destruction, slippage occurs between the pulley 45 and the belt, and the frictional heat causes the belt to be damaged and broken.
[0022]
Patent Literature 1 discloses an invention in which the operation of a compressor is stopped by detecting an abnormal increase in clutch abnormal temperature with an electromagnetic clutch at an early stage. Patent Literature 1 proposes mounting a temperature sensor near a bearing so that abnormal heat generation of a bearing can be detected early in addition to a rise in temperature of an electromagnetic clutch itself.
[0023]
[Patent Document 1]
JP-A-2002-61572 (paragraph number 0027, FIG. 2)
[0024]
However, in Patent Literature 1, the temperature sensor is installed at a core flange portion of an electromagnetic clutch or the like, and is slightly away from the bearing, so that even if the bearing temperature increases, it cannot be detected immediately. However, there is a problem that a time lag is inevitably generated until the temperature rise is detected.
[0025]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and provides a gas compressor and an air-conditioning system capable of detecting an abnormal rise in temperature of a pulley bearing that supports a pulley without delay.
[0026]
[Means for Solving the Problems]
In order to solve the above-described problems, a gas compressor of the present invention is a gas compressor that compresses gas by changing volume by rotating power, and a pulley that receives the rotating power from outside via a belt, The pulley bearing includes a pulley bearing that rotatably supports the pulley, and a temperature sensor mounted in contact with a fixed side of the pulley bearing.
[0027]
In the gas compressor of the present invention, the pulley bearing is a rolling bearing, a temperature sensor is in contact with the inner ring, and the temperature sensor is further fitted into a snap ring groove for mounting the inner ring, or The temperature sensor may be fitted and fixed at a predetermined angular position of the inner ring mounting snap ring groove, and the temperature sensor may be in contact with an end surface of the inner ring.
[0028]
The air conditioning system of the present invention is an air conditioning system having a gas compressor that compresses a gas by changing the volume by rotating power, the rising gas compressor includes a pulley that receives the rotating power from outside via a belt, A pulley bearing that rotatably supports the pulley, a temperature sensor mounted in contact with the fixed side of the pulley bearing, abnormal temperature determination means for determining an abnormal value of a detected temperature output of the temperature sensor, Emergency stop means for stopping the operation of the gas compressor or the system in response to the abnormality determination output of the abnormal temperature determination means.
[0029]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. The present invention is applicable to any type of gas compressor of a rotor shaft / pulley direct coupling type and an electromagnetic clutch coupling type. In the following embodiments, an electromagnetic clutch coupling type gas compressor will be described. Although the drawing does not show the entire gas compressor of the present invention, the gas compressor of the present invention has a compressor main body 1, a gas suction unit 2, a gas discharge unit 3, a rotary power introduction unit, as in FIG. 4. The compressor body 1, the gas suction part 2, and the gas discharge part 3 are not shown because they are not different from the conventional gas compressor, but the gas compressor is the compressor body 1 (see FIG. 8). ) Is operated by transmitting external power via a belt 49 (see FIG. 3) and a pulley 45 of an electromagnetic clutch to change the volume of a compression chamber of the compressor body 1 to compress gas.
[0030]
FIG. 1 is a longitudinal sectional view showing a rotary power introducing section 4 (see FIG. 8) according to an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1 with an electromagnetic clutch driven section removed, and FIG. FIG. 4 is an explanatory diagram illustrating a relationship between a load direction applied to the pulley bearing of FIG. 1 and a belt tension. FIG. 4 is a block diagram illustrating an abnormal temperature correspondence control system of the air conditioning system of the present invention having the gas compressor of FIG. FIG. 5 is a flowchart showing a flow of abnormal temperature correspondence control of the air conditioning system of the present invention. Regarding FIGS. 1 and 2, matters already described in the section of the related art are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0031]
The first embodiment of the present invention will be described below.
[0032]
1 and 2, the width w of the inner ring mounting snap ring (annular) groove 42c provided on the front head boss inner ring mounting outer periphery 42a is larger than the conventional annular groove of FIG. It is inserted into the pulley bearing inner ring 43b side. A temperature sensor (thermistor sensor in this embodiment) 50 is fitted and fixed at a predetermined angular position in the annular groove 42c. The temperature sensor 50 is in contact with the fixed side of the pulley bearing, that is, the inner ring 43b.
[0033]
Reference numeral 51 denotes a lead wire which is drawn from the temperature sensor 50 and sends temperature information to abnormality determination means described later. The lead wire 51 is embedded in the annular groove 42c and the axial groove 58 connected to the annular groove 42c and formed in the outer periphery 42a for attaching the boss inner ring. In adjusting the angular position of the temperature sensor 50, which will be described later, the lead wire 51 can be moved in these grooves 42c and 58.
[0034]
The axial fixing structure between the bearing outer ring 43a and the pulley 45 is such that a step 45d for contacting the shoulder of the outer ring 43a is arranged on the right side in the figure, and a snap ring 48 is arranged on the left side in the figure. And the arrangement is reversed.
[0035]
When attaching or detaching the temperature sensor 50, as shown in FIG. 2, the electromagnetic clutch follower 41 is detached from the rotor shaft 15, and then the snap ring 47 for fixing the inner ring is detached.
[0036]
As described above, the temperature rise of the pulley bearing 43 becomes remarkably large particularly at an angular position where a large radial load due to belt tension is applied. Therefore, it is desirable to mount the temperature sensor 50 at an angular position where a large radial load due to belt tension is applied, and to quickly detect the maximum temperature of the pulley bearing 43.
[0037]
The direction in which the belt tension is applied is not always the direction of the pulley shaft on the prime mover side. As shown in FIG. 3, the tension of the belt 49 is generally adjusted by a tension pulley 52. The position of the tension pulley 52 changes depending on the length of the belt 49, the distance D between the rotor shaft 15 of the gas compressor and the pulley shaft 53 on the prime mover side, and the magnitude of the tension applied to the belt 49. Therefore, the tension resultant force T applied to the pulley bearing 43 and the optimum mounting angle position P of the temperature sensor 50 on the axis of the resultant force T are determined by the mounting state of the belt 49, and are determined after the belt is mounted.
[0038]
Therefore, when attaching the temperature sensor 50, the belt 49 is set, the point P is confirmed thereafter, the snap ring 47 is removed as described above, and the temperature sensor 50 is fixed to the point P. Thereafter, the snap ring 47 is fitted, and the electromagnetic clutch follower 41 is attached to the rotor shaft 15.
[0039]
In FIG. 4 showing the air conditioning system of the present invention, since the relationship between the air conditioning system 200 and the gas compressor 100 is well known, a detailed description is omitted here.
[0040]
In FIG. 4, the detected temperature output of the temperature sensor 50 that detects the temperature on the fixed side of the pulley bearing 43 is transmitted to the abnormal temperature determination unit 55 via the lead wire 51. When the detected temperature output is determined to be an abnormal value by the abnormal temperature determining means 55, the abnormal temperature determining means 55 sends an abnormal determination output to the emergency stop means 56 of the air conditioning system 200.
[0041]
Upon receiving the abnormality determination output, the emergency stop unit 56 sends a stop signal to the air conditioning system 200 to stop the air conditioning system 200. In the case of a gas compressor of a rotor shaft / pulley direct connection type such as a gas heat pump system, the power of the entire system 200 is turned off. However, in this embodiment, the excitation of the electromagnetic clutch is turned off because an electromagnetic clutch is used. I do. Thereby, damage to the electromagnetic clutch due to abnormal temperature rise of the electromagnetic clutch can be avoided.
[0042]
FIG. 5 is a flowchart showing a flow of abnormal temperature correspondence control of the air conditioning system of the present invention. In step 501, the temperature of the temperature sensor 50 is detected and the detected temperature output is constantly sent to the abnormal temperature determining means 55. Then, the abnormal temperature determination means 55 determines whether the detected temperature output of the temperature sensor 50 is equal to or lower than a preset temperature, for example, 90 ° C. If the temperature is equal to or lower than the set temperature (Yes), the process returns to step 501, and if the temperature exceeds the set temperature (No), an abnormality determination output is sent to the emergency stop means 56, and in step 503, the electromagnetic clutch is turned off or the air conditioning system 200 is turned off.
[0043]
Instead of the thermistor, another temperature sensor suitable for measurement at around 100 ° C., for example, a thermocouple, a resistance temperature detector (thermistor), or the like can be used as the temperature sensor. If a thermal protector or a thermal fuse is used as the temperature sensor, the sensor itself doubles as a switch of the emergency stop means.
[0044]
Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view showing a rotary power introduction unit 4 (see FIG. 8) according to another embodiment of the present invention, and FIG. 7 is an enlarged view of a main part of FIG. 6 with an electromagnetic clutch follower removed. 6 and 7, the same reference numerals are given to the items described in FIGS. 1 and 2, and the detailed description thereof will be omitted.
[0045]
In this embodiment, the temperature sensor 50 that is in contact with the fixed side of the pulley bearing is attached at a predetermined angular position in contact with the end face on the far side of the inner ring 43b. That is, instead of determining the angular position of the temperature sensor 50 after adjusting the belt tension, the temperature sensor 50 is mounted at an angular position at which the temperature sensor 50 can be easily mounted. Since the inner ring 43b is made of metal and has good heat conduction, even if the angle position where the maximum radial load is applied is different from the angle position of the sensor, the time lag until abnormal temperature detection is not so large. In this embodiment, the adjustment of the angular position of the temperature sensor 50 after the adjustment of the belt tension is omitted by setting the set temperature of the abnormal temperature determination means 55 to be slightly lower.
[0046]
6 and 7, reference numeral 57 denotes a snap ring that fixes the core 46 to the front head 42. A groove 59 is formed in the axial direction in the core fixing outer periphery 42d to which the snap ring 57 is attached, and the temperature sensor 50 and the lead wire 51 are embedded in the groove 59, and the temperature sensor 50 is attached in contact with the inner ring end surface of the pulley bearing 43. It is. The width of the inner ring mounting snap ring groove 42e is the conventional groove width of FIG.
[0047]
Also in this embodiment, the abnormal temperature control system of the air conditioning system of FIG. 4 is used, and is controlled according to the flowchart of FIG.
[0048]
【The invention's effect】
As described above, according to the present invention, since the temperature sensor is mounted on the fixed side of the pulley bearing, for example, in contact with the inner ring of the rolling bearing, when abnormal heat generation occurs in the pulley bearing, this abnormal Heat generation can be detected, and damage to the electromagnetic clutch of the gas compressor, the gas compressor itself, or the air conditioning system based on abnormal heat generation of the pulley bearing can be avoided in advance.
[0049]
Furthermore, if the temperature sensor is fitted in a predetermined angular position of the snap ring groove for mounting the inner ring of the roller bearing type pulley bearing and is fixed by the snap ring, the largest pulley bearing after the gas compressor is installed. The temperature sensor can be arranged at an angular position where a load is applied, and abnormal heat generation of the pulley bearing can be detected earlier.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 2 is an enlarged sectional view of a main part of FIG.
FIG. 3 is an explanatory diagram illustrating a relationship between a load direction applied to a pulley bearing and a belt tension.
FIG. 4 is a block diagram showing a control system corresponding to an abnormal temperature of a pulley bearing of the air conditioning system of the present invention.
FIG. 5 is a flowchart showing a flow of pulley bearing abnormal temperature correspondence control of the air conditioning system of the present invention.
FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention.
FIG. 7 is an enlarged sectional view of a main part of FIG. 4;
FIG. 8 is a longitudinal sectional view showing an example of a gas compressor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor main body 2 Gas suction part 3 Gas discharge part 4 Rotary power introduction part 11 Cylinder chamber 12 Rotor 15 Rotor shaft 21 Suction port 31 Discharge port 41 Electromagnetic clutch driven part 41a Amateur friction plate 42 Front head 42a Boss inner ring mounting outer periphery 42b Boss inner ring mounting step end surface 42c Inner ring mounting snap ring groove (annular groove)
42d Core fixing outer periphery 43 Pulley bearing 43a Outer ring 43b Inner ring 44 Electromagnetic clutch driving part 45 Pulley 45a Annular cavity part 45b Center hole 45c End face 46 Core 46a Exciting coils 47, 48 Snap ring 49 Belt 50 Temperature sensor 52 Tension pulley 53 Motor side Pulley shaft 55 Abnormal temperature determination means 56 Emergency stop means 58, 59 Groove 100 Gas compressor 200 Air conditioning system

Claims (6)

A gas compressor that compresses a gas by changing its volume by rotational power,
A pulley that receives the rotational power from outside via a belt,
A pulley bearing that rotatably supports the pulley,
And a temperature sensor mounted in contact with the fixed side of the pulley bearing. The gas compressor according to claim 1, wherein the pulley bearing is a rolling bearing, and the temperature sensor is in contact with the inner ring. 3. The gas compressor according to claim 2, wherein the temperature sensor is fitted in a snap ring groove for attaching an inner ring. The gas compressor according to claim 3, wherein the temperature sensor is fitted and fixed at a predetermined angular position of the snap ring groove for attaching the inner ring. The gas compressor according to claim 2, wherein the temperature sensor is in contact with an end surface of the inner ring. An air conditioning system having a gas compressor that compresses a gas by changing a volume by rotating power,
The rising gas compressor has a pulley that receives rotational power from outside via a belt, and a pulley bearing that rotatably supports the pulley,
A temperature sensor mounted in contact with the fixed side of the pulley bearing,
Abnormal temperature determining means for determining an abnormal value of the detected temperature output of the temperature sensor;
An air-conditioning system comprising: emergency stop means for stopping the operation of the gas compressor or the system upon receiving the abnormality determination output of the abnormal temperature determination means.

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