JP2008163914A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor having a compact and inexpensive structure capable of having a rotation detecting mechanism, without requiring boring work for a machine body only for the rotation detecting mechanism. <P>SOLUTION: This compressor 1 has a plurality of housing members 3 to 5 forming the machine body 2, a drive shaft 8 connected to a motive power source via an electromagnetic clutch 7, a movable member 11 compressing fluid in cooperation with the drive shaft, a detected body 9 cooperating with the drive shaft, a drain bolt 32 equipped in the housing member 3 in the vicinity of the detected body and threadedly engaged with a drain bolt hole 31, and a detecting means for detecting a rotating state of the drive shaft by the detected body, and is characterized in that the drain bolt has a permanent magnet 33, and the detecting means is constituted of a magnetic sensor 20 having a magnetic impedance element, and the magnetic sensor is arranged in a head part of the drain bolt. Thus, the rotation detecting mechanism can be provided by using an existing drain bolt without requiring the boring work for the machine body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a compressor, and more particularly to a compressor for a car air conditioner. More specifically, the airframe has a compact and inexpensive structure that can be equipped with a rotation detection mechanism without requiring drilling for the rotation detection mechanism. Regarding compressors.

2. Description of the Related Art Conventionally, as a compressor for vehicle air conditioning, a compressor having a rotation detection mechanism for detecting a rotation failure state due to seizure or the like is known. For example, as shown in FIG. 19, this rotation detection mechanism is formed by forming a through hole 102 in a non-magnetic housing member 101 and mounting a detection sensor 104 via an O-ring 103 in the through hole 102. The detection sensor 104 detects a rotation state by converting a change in magnetic flux flowing from the magnet 106 to the iron core 107 into a voltage by the pickup coil 108 as the detection body 105 rotates.
However, in the conventional rotation detection mechanism, the housing member 101 needs to be drilled to form the through hole 102, which increases the production cost of the compressor. In addition, a seal structure using the O-ring 103 is necessary, which further increases the production cost. Further, there is a problem that foreign matter adhering to the detection sensor 104 enters the compressor and the compressor may be burned.

Therefore, as a conventional compressor that solves the above problem, there is known a compressor in which a detection sensor is provided outside the housing member and does not require drilling in the housing member (see, for example, Patent Documents 1 and 2).
In Patent Documents 1 and 2, a detector is provided outside the machine body, and leakage flux from the electromagnetic clutch is coupled to the drive shaft, a rotating base (detector body) that cooperates with the drive shaft, and the machine body. A circulating magnetic circuit is formed by sequentially conducting the bolts (fasteners), and a magnetic flux change is generated between the bolt and the bolt through the periodic motion of the rotating base, and the magnetic flux change is detected by a detector. Is configured to detect the rotational speed of the compressor based on the above. Thereby, there exists an advantage that a high detection capability can be exhibited with a simple structure.
In Patent Document 2, a permanent magnet for amplifying a change in magnetic flux is provided in a housing member near the detector. Thereby, there exists an advantage that the detection capability higher than patent document 1 can be exhibited.

However, in Patent Document 1, the magnetic sensor is provided on the stator side of the electromagnetic clutch facing the head of the fastener or the fastener, and the total length in the axial direction of the compressor increases due to the space for mounting the sensor. There was a problem such as.
Moreover, in the said patent document 2, while providing the permanent magnet, while changing the shape of a housing member, a new magnetic flux generation source is required. Furthermore, in order to amplify the magnetism composed of a large circulating magnetic circuit, a powerful and expensive magnet is required. For these reasons, there have been problems such as an increase in compressor production costs.

Japanese Patent Laid-Open No. 6-299960 JP-A-8-319944

  As described above, the present invention has been made in view of the above-described situation, and a compressor having a compact and inexpensive structure that can include a rotation detection mechanism without requiring drilling in the airframe only for the rotation detection mechanism. The purpose is to provide.

The present invention is as follows.
1. A plurality of housing members forming the fuselage, a drive shaft that is inserted through the fuselage and connected to a power source via an electromagnetic clutch, a movable member that cooperates with the drive shaft and compresses fluid,
A detection body that co-operates with the drive shaft, a drain bolt that is screwed into a drain bolt hole provided in the housing member in the vicinity of the detection body, and a detection means that detects the rotational state of the drive shaft by the detection body And the drain bolt includes a permanent magnet, and the detection means includes a magnetic sensor, and the magnetic sensor is provided on a head of the drain bolt.
2. The magnetic flux from the permanent magnet is conducted to the detection body and the drain bolt to form a circulating magnetic circuit. The compressor described.
3. The permanent magnet is provided at the tip of the drain bolt. Or 2. The compressor described.
4). The permanent magnet is provided at the head of the drain bolt. Or 2. The compressor described.
5. The detection means further includes a magnetic member that covers a head of the drain bolt. Thru 4. The compressor in any one of.
6). A plurality of housing members forming the fuselage, a drive shaft that is inserted through the fuselage and connected to a power source via an electromagnetic clutch, a movable member that cooperates with the drive shaft and compresses fluid,
A detection body that co-operates with the drive shaft, a drain bolt that is screwed into a drain bolt hole provided in the housing member in the vicinity of the detection body, and a detection means that detects the rotational state of the drive shaft by the detection body The detection body includes a permanent magnet at a peripheral portion thereof, and the detection means includes a magnetic sensor, and the magnetic sensor is provided on the head of the drain bolt. Compressor.
7). 5. The magnetic flux from the permanent magnet is conducted to the detection body and the drain bolt to form a circulating magnetic circuit. The compressor described.
8). 5. The detection unit further includes a magnetic member that covers a head of the drain bolt. Or 7. The compressor described.

According to the compressor of the present invention, a permanent magnet is provided on a drain bolt that is normally provided to form a circulating magnetic circuit via the drain bolt, and a magnetic sensor provided on the head of the drain bolt causes a magnetic flux of the circulating magnetic circuit to be formed. The change is detected from the outside of the housing member to detect the rotational state of the compressor. Accordingly, it is possible to provide a rotation detection mechanism by using an existing drain bolt without requiring drilling for detection means in the airframe, and to provide a compressor having a compact and inexpensive structure. it can. In addition, since the detection means is located outside the housing member, it is not necessary to protect the detection means from pressure, and foreign matter contamination due to the arrangement can be avoided, so that a compressor having a compact and inexpensive structure is provided. be able to.
Further, when the circulating magnetic circuit by the magnetic flux of the permanent magnet is conducted to the detection body and the drain bolt, a stronger circulating magnetic circuit can be formed, and the magnetic flux change of the circulating magnetic circuit can be detected more reliably. it can.
Furthermore, when the permanent magnet is provided at the tip of the drain bolt, a stronger circulating magnetic circuit can be formed, and the magnetic flux change of the circulating magnetic circuit can be detected more reliably.
Further, when the permanent magnet is provided at the head of the drain bolt, a stronger circulating magnetic circuit can be formed, and a change in magnetic flux of the circulating magnetic circuit can be detected more reliably.
Further, when the detecting means includes a magnetic member that covers the head of the drain bolt, a stronger circulating magnetic circuit can be formed, and a change in magnetic flux of the circulating magnetic circuit can be detected more reliably. it can.

According to the compressor of the present invention, the magnetic flux from the magnet provided on the detection body forms a circulating magnetic circuit via the drain bolt, and the magnetic sensor provided on the head of the drain bolt changes the magnetic flux of the circulating magnetic circuit. The rotation state of the compressor is detected from the outside of the housing member. Accordingly, it is possible to provide a rotation detection mechanism by using an existing drain bolt without requiring drilling for detection means in the airframe, and to provide a compressor having a compact and inexpensive structure. it can. In addition, since the detection means is located outside the housing member, it is not necessary to protect the detection means from high pressure, and foreign matter accompanying the arrangement can be avoided, so that a compressor having a compact and inexpensive structure is provided. be able to.
Further, when the circulating magnetic circuit by the magnetic flux of the permanent magnet is conducted to the detection body and the drain bolt, a stronger circulating magnetic circuit can be formed, and the magnetic flux change of the circulating magnetic circuit can be detected more reliably. it can.
Further, when the detecting means includes a magnetic member that covers the head of the drain bolt, a stronger circulating magnetic circuit can be formed, and a change in magnetic flux of the circulating magnetic circuit can be detected more reliably. it can.

The compressor of the present invention will be described in detail below.
1. Compressor The compressor according to the present invention includes a housing member, a drive shaft, a movable member, a detection body, a drain bolt hole, a drain bolt, and detection means described below. Further, the compressor can further include, for example, a swash plate described later.
The compression form of the compressor can be arbitrarily selected, and examples thereof include a reciprocating type, a scroll type, a screw type, and a vane type.

  The material, shape, number, etc. of the “housing member” are not particularly limited as long as a plurality of “housing members” can be combined to form a compressor body. The housing member can be made of a nonmagnetic material, for example. Examples of the housing member include a front housing, a cylinder block, and a rear housing.

The “drive shaft” is not particularly limited in material, shape, length, etc. as long as it can be inserted into the airframe and connected to a power source via an electromagnetic clutch. This drive shaft is normally rotatably supported in the body. The drive shaft can be made of a magnetic material, for example.
The electromagnetic clutch is normally rotatably supported on the front end side of a front housing as a housing member. Examples of the power source include an internal combustion engine and an electric motor.

  The “movable member” is not particularly limited in its structure and moving form as long as it can cooperate with the drive shaft and compress the fluid. As this movable member, it can employ | adopt suitably according to the compression form etc. of a compressor, For example, a piston, a scroll, a screw, a vane etc. can be mentioned.

The “detection body” is not particularly limited in material, shape, movement form, and the like as long as it can co-operate with the drive shaft. For example, the detecting body causes a change in clearance with the drain bolt by co-operation with the drive shaft, thereby causing a circulating magnetic circuit A (see, for example, FIG. 2) and a circulating magnetic circuit B (see, for example, FIG. 15). ) Can cause a magnetic flux change. The circulating magnetic circuit A is usually formed by a magnetic flux from a permanent magnet provided on the drain bolt being conducted to the detection body and the drain bolt. In addition, the circulating magnetic circuit B is normally formed by a magnetic flux from a permanent magnet provided on the detection body being conducted to the detection body and the drain bolt.
The detection body can be attached to the drive shaft, for example, and can be rotated together with the drive shaft. Moreover, this detection body can consist of magnetic bodies, for example. In addition, the detection body may be formed in a disk shape, for example, and may have one or more reduced diameter portions or protrusions for generating a magnetic flux change on the outer peripheral side thereof.
For example, the detection body can be disposed between the electromagnetic clutch and the movable member. From the viewpoint of detection accuracy, it is preferable that the detection body is disposed at a position near the electromagnetic clutch in the front housing as the housing member.

  When the detection body includes a permanent magnet, for example, as illustrated in FIGS. 15 and 16, it is preferable to provide the permanent magnet 33 on the peripheral side of the detection body 9. Further, the “peripheral side” is not limited to the provision of permanent magnets along the periphery of the detection body 9 as illustrated in FIGS. 14 to 16, and the inner side of the periphery of the detection body as illustrated in FIGS. 17 and 18. It is also included to provide a permanent magnet.

The “drain bolt hole” is a threaded through hole provided in a housing (hereinafter referred to as a front housing) located in the vicinity of the detection body, and the liquid injected into or accumulated in the compressor It is a hole that is usually provided for discharging the water. The size of the drain bolt hole is not particularly limited as long as it is a size normally used. In addition, the position of the drain bolt hole only needs to detect a magnetic change due to the position of the detection body. As such a position, the front housing located in the periphery of a detection body can be illustrated.
The “drain bolt” is a bolt that is normally provided to seal the hole by screwing into the drain bolt hole. Further, the drain bolt is not particularly limited as long as it is a magnetic body.
The position and method of providing the permanent magnet 33 on the drain bolt are not particularly limited. For example, as a disposition position, the tip of the drain bolt 32 (for example, see FIG. 2) is provided with a bottomed hole at the tip of the drain bolt (see, for example, FIG. 2 or FIG. 9), fixing to the head (for example, see FIG. 10), etc., surrounding the drain bolt (for example, see FIG. 12), embedding in the drain bolt (not shown), etc. it can. Examples of the arrangement method include fitting, adhesion, and fixing by the magnetic force of the permanent magnet itself.
Furthermore, as illustrated in FIG. 13, a yoke material 34 made of a magnetic member that covers the head of the drain bolt may be provided, and a permanent magnet 33 may be provided on the yoke material 34.

  The “detecting means” detects a rotational state of the drive shaft by detecting a change in magnetic flux of the circulating magnetic circuits A and B by the detector. This detection means is constituted by a magnetic sensor.

As shown in FIGS. 1 and 2, the “magnetic sensor” is not particularly limited in shape, size, number, etc. as long as it is provided on the head of the drain bolt. The type of the magnetic sensor is not particularly limited, and examples thereof include a pickup coil and a hall element. Further, the magnetic sensor is arranged, for example, such that the magnetic sensing direction P is along a direction orthogonal to the axial direction of the aircraft (see FIGS. 2 and 3), or the magnetic sensitive direction P is in the axial direction of the aircraft. It can be arranged along (see FIG. 4).
When a pickup coil is used for the magnetic sensor, it is possible to detect the magnetosensitive direction P illustrated in FIG. Further, when a Hall element is used for the magnetic sensor, it is possible to detect the magnetosensitive direction P exemplified in FIGS.
Furthermore, the “vicinity” is a position where a change in magnetic flux caused by a change in the distance between the detection body and the drain bolt when the detection body rotates can be detected.

  The “swash plate” is not particularly limited in its material, shape, movement form, etc. as long as it can co-operate with the drive shaft. The swash plate is normally supported on the drive shaft so as to be tiltable, and tilts with respect to the drive shaft as the drive shaft rotates to move the movable member.

Hereinafter, the present invention will be specifically described with reference to the drawings.
In the first embodiment, as a compressor according to the present invention, there is provided a variable displacement compressor for vehicle air conditioning which has a detecting means at the head of a drain bolt and whose compression capacity changes according to a change in inclination of a swash plate, which will be described later. Illustrate.

(1) Configuration of Compressor As shown in FIG. 1, a compressor 1 according to the present embodiment is a cylindrical, aluminum (non-magnetic) front housing 3, cylinder block 4 and rear housing 5 (according to the present invention). It is exemplified as a “housing member”). The rear end of the front housing 3 is brought into contact with the front end of the cylinder block 4 and the rear end of the rear housing 5 is brought into contact with the rear end of the cylinder block 4 via the valve plate 12. Screw portions (not shown) of a plurality of bolt members 6 (magnetic body) are screwed into the rear housing 5, and the head portions 6 a of the respective bolt members 6 are locked to the outer end surface of the front housing 3. Thus, the front housing 3, the cylinder block 4 and the rear housing 5 are integrally coupled to each other.

  In the crank chamber 3a formed in the front housing 3, a ferrous metal drive shaft 8 connected to an engine (not shown) via an electromagnetic clutch 7 is inserted. The drive shaft 8 is rotatably supported through a bearing in the cylinder block 4 and the front housing 3. A detection body 9 made of a ferrous metal (magnetic material) is fixed to the drive shaft 8. The detection body 9 is disposed between the electromagnetic clutch 7 and a piston, which will be described later, and is located near the electromagnetic clutch 7 in the front housing 3. Further, on the outer peripheral side of the detection body 9, in order to cause a magnetic flux change due to rotation in a circulating magnetic circuit, which will be described later, there are enlarged diameter portions 9a and reduced diameter portions 9b at a predetermined interval (180 degrees) in the circumferential direction. It is formed (see FIG. 3). The drive shaft 8 is provided with a swash plate 10 so as to be tiltable. The swash plate 10 is guided by a guide portion 9c of a rotating detection body 9 and tilted within a predetermined angle range.

  Further, the front housing 3 is in a crank chamber 3 a formed therein, and has a drain bolt hole 31 and a drain bolt 32 screwed into the drain bolt hole 31. The axial position of the drain bolt hole 31 relative to the machine body 2 is provided at a position facing the radial direction of the detection body 9. A permanent magnet 33 is provided at the tip of the drain bolt 32. The position of the permanent magnet 33 is a position that can detect a change in magnetic flux caused by the rotation of the detection body 9 and the change in the distance between the peripheral edge and the drain bolt.

  In a plurality of cylinder chambers 4 a formed in the cylinder block 4, pistons 11 (illustrated as “movable members” according to the present invention) are supported so as to be movable in the axial direction of the machine body 2. The outer peripheral end portion of the swash plate 10 is connected to a connecting portion 11 a formed on the front side of the piston 11. Therefore, the swash plate 10 is tilted by the rotation of the drive shaft 8 and the detection body 9, and the piston 11 is reciprocated in the cylinder chamber 4a. Then, the reciprocating motion of the piston 11 compresses the refrigerant gas sucked into the cylinder chamber 4 a from the suction chamber 5 a formed in the rear housing 5, and the compressed gas enters the discharge chamber 5 b formed in the rear housing 5. Discharged.

  The electromagnetic clutch 7 is rotatably supported on the boss 3b of the front housing 3 via a bearing. The electromagnetic clutch 7 is fixed to a pulley 13 connected to a crank pulley of an engine (exemplified as a “power source” according to the present invention) via a V-belt (not shown), and an inner peripheral side of the pulley 13. A rotor 14, a stator 16 fixed to the rotor 14 and including an electromagnetic coil 15, a disk-shaped armature 17 disposed opposite to a conductive friction surface of the rotor 14, and the armature 17 are coupled to the drive shaft 8. And a hub 18.

  A magnetic sensor 20 (illustrated as “detection means” according to the present invention) capable of detecting a change in magnetic flux is provided on the outer side surface of the front housing 3 and on the head of the drain bolt 32. The magnetic sensor 20 has an element 21 composed of a pickup coil or the like. Further, the magnetic sensor 20 is arranged such that the magnetic sensing direction P is orthogonal to the axial direction of the body 2.

  Here, as shown in FIG. 2, the magnetic flux from the permanent magnet 33 is conducted to the detection body 9 and the drain bolt 32 to form a circulating magnetic circuit A (indicated by a one-dot chain line in the figure).

(2) Operation of Compressor Next, the operation of the compressor 1 having the above configuration will be described.
When a voltage is applied to the electromagnetic coil 15 in the electromagnetic clutch 7, a magnetic field is generated and the pulley 13 and the hub 18 are coupled. And since the hub 18, the drive shaft 8, and the detection body 9 are joined, the motive power of an engine is transmitted to the pulley 13, and the pulley 13, the drive shaft 8, and the detection body 9 rotate simultaneously. Then, the rotation of the detection body 9 causes the swash plate 10 to tilt, and the piston 11 reciprocates in the cylinder chamber 4a, and the refrigerant gas sucked into the cylinder chamber 4a from the suction chamber 5a of the rear housing 5 is compressed, The compressed gas is discharged into the discharge chamber 5 b of the rear housing 5.

  Further, the circulating magnetic circuit A (see FIG. 2) is formed by the magnetic flux of the permanent magnet 33. And the detection body 9 is provided with the part from which a diameter differs (refer FIG. 3), and if this detection body 9 rotates, the clearance gap (air gap) between the permanent magnet 33 and the detection body 9 will change, and the circulation magnetic circuit A The magnetic flux density changes. Among these, since the output voltage of the magnetic sensor 20 that detects the magnetic flux change of the circulating magnetic circuit A changes, the rotation state of the compressor 1 can be detected based on the change.

(3) Effects of Example As described above, in this example, the compressor 1 is configured by providing the magnetic sensor 20 on the head of the drain bolt 32 that is the outer side surface of the front housing 3 that forms the machine body 2. The magnetic flux from the magnet 33 is conducted to the detection body 9 and the drain bolt 32 to form the circulating magnetic circuit A, and the magnetic sensor 20 detects the magnetic flux change of the circulating magnetic circuit A from the outer side surface of the front housing 3. The rotation state of the compressor 1 is detected. This eliminates the need for drilling for the magnetic sensor 20 in the airframe 2 of the compressor 1. As a result, the production cost of the compressor can be reduced as compared with a conventional machine that has been drilled. In addition, it is not necessary to protect the magnetic sensor 20 from a high pressure by providing an O-ring seal structure or the like, and the production cost can be further reduced. Furthermore, foreign matter adhering to the magnetic sensor does not enter the compressor and cause seizure or the like. Further, as compared with the conventional one in which the detection means is provided on the stator side of the electromagnetic clutch facing the head of the bolt member or the head, the sensor is mounted between the electromagnetic clutch 7 and the front end surface of the front housing 3. Since there is no need to provide a space, the overall length of the compressor in the body axis direction can be shortened.

  In the second embodiment, as a compressor according to the present invention, a variable displacement compressor for vehicle air conditioning that includes a magnetic member that covers the head of a drain bolt and whose compression capacity changes due to a change in inclination of a swash plate, which will be described later, is illustrated. To do.

As shown in FIGS. 5 and 6, the compressor 1 according to the second embodiment further includes the same configuration as that of the first embodiment except that the yoke member 34 is a magnetic member according to the present invention. The yoke material 34 is provided on the head of the drain bolt 32 together with the magnetic sensor 20 and has a shape that comes into contact with a portion of the head of the drain bolt 32 that is not covered by the magnetic sensor 20. The yoke material 34 is made of a ferrous metal that is a magnetic material.
As shown in FIG. 6, such a yoke member 34 enhances the coupling between the magnetic sensor 20 and the drain bolt 32 that are part of the circulating magnetic circuit A, thereby further improving the magnetic sensor 20's ability to detect magnetic flux changes. Can do. For this reason, even if a permanent magnet having a weaker magnetic force and less expensive is used, a change in magnetic flux due to the rotation of the detection body 9 can be detected, and the production cost can be further controlled.

In the third embodiment, as a compressor according to the present invention, a variable displacement compressor for vehicle air conditioning in which a permanent magnet is provided at the head of a drain bolt and the compression capacity changes due to a change in inclination of a swash plate, which will be described later, will be exemplified.
As shown in FIGS. 7 and 8, the compressor 1 according to the third embodiment has the same configuration as that of the first embodiment except that the arrangement position of the permanent magnet 33 is embedded in the head of the drain bolt 32.
As described above, even in the third embodiment in which the permanent magnet 33 is disposed in the head of the drain bolt 32, the magnetic flux change due to the rotation of the detection body 9 is detected as in the first embodiment. be able to.

In the fourth embodiment, as a compressor according to the present invention, a variable displacement compressor for vehicle air conditioning in which a permanent magnet is provided on the peripheral side of the detection body 9 and the compression capacity is changed by a change in inclination of a swash plate, which will be described later. .
As shown in FIGS. 14 to 16, the compressor 1 according to the fourth embodiment has the same configuration as that of the first embodiment except that the arrangement position of the permanent magnet 33 is embedded on the peripheral side of the detection body 9.
In this way, in Example 4 in which the permanent magnet 33 is disposed on the peripheral side of the detection body 9, as shown in FIG. 15, the magnetic flux from the permanent magnet 33 is applied to the detection body 9 and the drain bolt 32. To form a circulating magnetic circuit B (indicated by a one-dot chain line in the figure). For this reason, the magnetic flux change by rotation of the detection body 9 is detectable similarly to Example 1 and 3. FIG.

In the present invention, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention depending on the purpose and application. In other words, in the above-described embodiment, the magnetic sensor 20 is arranged so that the magnetic sensing direction P faces the axial direction of the body 2 of the compressor 1, but the present invention is not limited to this. For example, as shown in FIG. The element 21 in the sensor 20 may be arranged such that the magnetic sensing direction P faces a direction substantially orthogonal to the axial direction of the body 2 of the compressor 1 or has a predetermined angle.
Moreover, in the said Example, although the detection body 9 which has a pair of enlarged diameter part 9a and the reduced diameter part 9b was illustrated, it is not limited to this, For example, it is predetermined along the circumferential direction on the outer peripheral side of the detection body 9 A plurality of concave portions (reduced diameter portions) may be formed at intervals.

  The compressor of the present invention is used as a compressor for vehicles. In particular, it is preferably used as a compressor for vehicle air conditioning.

1 is a cross-sectional view illustrating a compressor according to a first embodiment. FIG. 3 is an enlarged view of a main part of the compressor according to the first embodiment. It is a front view which shows a detection body. It is explanatory drawing for demonstrating the other arrangement | positioning form of a magnetic sensor. It is sectional drawing which shows the compressor which concerns on the present Example 2. FIG. 6 is an enlarged view of a main part of a compressor according to a second embodiment. It is sectional drawing which shows the compressor which concerns on the present Example 3. FIG. 6 is an enlarged view of a main part of a compressor according to a third embodiment. It is explanatory drawing for demonstrating the other arrangement | positioning form of a permanent magnet. It is explanatory drawing for demonstrating the other arrangement | positioning form of a permanent magnet. It is explanatory drawing for demonstrating the other arrangement | positioning form of a permanent magnet. It is explanatory drawing for demonstrating the other arrangement | positioning form of a permanent magnet. It is explanatory drawing for demonstrating the other arrangement | positioning form of a permanent magnet. It is sectional drawing which shows the compressor which concerns on the present Example 4. FIG. 10 is an enlarged view of a main part of a compressor according to a fourth embodiment. It is a front view which shows the detection body which concerns on the present Example 4. FIG. It is sectional drawing which shows the compressor of another aspect. It is a front view which shows the detection body of another aspect. It is sectional drawing which shows the conventional compressor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Compressor, 2; Airframe, 3; Front housing, 4; Cylinder block, 5; Rear housing, 6; Bolt member, 7: Electromagnetic clutch, 8; Drive shaft, 9; Sensor, 31; drain bolt hole, 32; drain bolt, 33; permanent magnet, 34; yoke material.

Claims (8)

A plurality of housing members forming the fuselage;
A drive shaft inserted through the airframe and connected to a power source via an electromagnetic clutch;
A movable member that cooperates with the drive shaft to compress the fluid;
A detection body that co-acts with the drive shaft;
A drain bolt screwed into a drain bolt hole provided in the housing member in the vicinity of the detection body;
In a compressor comprising: detecting means for detecting a rotation state of the drive shaft by the detection body;
The drain bolt comprises a permanent magnet, the detection means is constituted by a magnetic sensor, and the magnetic sensor is provided at the head of the drain bolt.   The compressor according to claim 1, wherein the magnetic flux from the permanent magnet is conducted to the detection body and the drain bolt to form a circulating magnetic circuit.   The compressor according to claim 1, wherein the permanent magnet is provided at a tip of the drain bolt.   The compressor according to claim 1, wherein the permanent magnet is provided on a head of the drain bolt.   The compressor according to any one of claims 1 to 4, wherein the detection unit further includes a magnetic member that covers a head of the drain bolt. A plurality of housing members forming the fuselage;
A drive shaft inserted through the airframe and connected to a power source via an electromagnetic clutch;
A movable member that cooperates with the drive shaft to compress the fluid;
A detection body that co-acts with the drive shaft;
A drain bolt screwed into a drain bolt hole provided in the housing member in the vicinity of the detection body;
In a compressor comprising: detecting means for detecting a rotation state of the drive shaft by the detection body;
The detection body includes a permanent magnet at a peripheral portion thereof, and the detection means includes a magnetic sensor, and the magnetic sensor is provided on a head of the drain bolt.   The compressor according to claim 6, wherein magnetic flux from the permanent magnet is conducted to the detection body and the drain bolt to form a circulating magnetic circuit.   The compressor according to claim 6 or 7, wherein the detection means further includes a magnetic member that covers a head of the drain bolt.

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