JP2006118411A - Gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain miniaturization and weight reduction of the whole gas compressor by attaining miniaturization and weight reduction of a housing. <P>SOLUTION: The gas compressor is provided with a cylindrical housing 12 storing a gas compression mechanism 14 airtightly. The housing 12 is provided with a cylindrical housing body 12a opened at one end, and a cover member 12b closing the annular open end of the housing body. The cover member 12b has an annular abutting face 38a abutting on an end face 37 of the open end of the housing body 12a, and the abutting face is formed of an annular projecting part 41 rising from the abutting face along an inner peripheral wall 42 of the open end of the housing body 12a. An annular seal member 44 for airtightly sealing a clearance between the housing body 12a and the cover member 12b is disposed between the projecting part 41 and the inner peripheral wall 42 of the open end facing the projecting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a gas compressor suitable for incorporation as a refrigerant compressor in a refrigerator or an air conditioner.

  In the gas compressor, a gas compression mechanism is accommodated in a housing having a suction port and a discharge port, and the high pressure gas discharged from the low pressure suction chamber and the gas compression mechanism communicating with the suction port is contained in the housing. A high pressure chamber is formed to guide the discharge port. This housing can be divided into a plurality of housing members, and the housing is constituted by a combination of these housing members (for example, Patent Document 1).

  In order to maintain the airtightness in the housing, a sealing mechanism having a seal member is applied to the contact portions of these housing members. For example, as shown in FIG. 2, a housing 3 containing a gas compression mechanism 1 and an electric motor 2 for driving the gas compression mechanism is formed of a cylindrical member whose one end is open, and an open end of the housing body is closed. In the case of being divided into a rear housing member 3b that is a lid member, a sealing mechanism 4 is provided between the housing main body 3a and the rear housing member 3b.

  The seal member 4a of the sealing mechanism 4 is formed on the inner surface 4d of the flange between the open end surface 4b of the housing body 3a and the flat inner surface 4d of the annular flange 4c of the rear housing member 3b covering the end surface. Is accommodated in the annular groove 4e. The seal member 4a seals between the housing body 3a and the rear housing member 3b by being held in a compressed state between the groove surface of the annular groove 4e and the open end surface 4b of the housing body 3a.

When the gas compression mechanism 1 is operated by the operation of the electric motor 2, the gas sucked from the suction port 3c of the housing 3 is sucked into the gas compression mechanism 1 through the suction chamber 5a and is compressed by the gas compression mechanism. . The gas compressed by the gas compression mechanism 1 is discharged outside from the discharge port 3d of the housing 3 through the high pressure chamber 5b defined inside the rear housing member 3b. Since the space between the rear housing member 3b and the housing main body 3a is securely sealed by the seal member 4a accommodated in the annular groove 4e of the sealing mechanism 4, the compressed gas sucked into the suction chamber 5a. Is reliably guided to the gas compression mechanism 1 without leaking between the housing body 3a and the rear housing member 3b.
JP2003-254244 (paragraph 0010, FIG. 1)

  However, as shown in FIG. 2, when the seal member 4a is disposed between the open end surface 4b of the housing body 3a and the inner surface 4d of the flange 4c of the rear housing member 3b that contacts the open end surface, the inner surface of the flange 4c. Since it is necessary to form the annular groove 4e in 4d, it is necessary to increase the outer diameter and thickness of the flange 4c by at least the width dimension W and the depth dimension D of the annular groove, respectively. Further, it is necessary to increase the wall thickness at the open end of the housing body 3a as the outer diameter of the flange 4b increases. Therefore, the conventional gas compressor having the sealing mechanism 4 has a problem in reducing the size and weight of the housing.

  Therefore, an object of the present invention is to reduce the size and weight of the entire gas compressor by reducing the size and weight of the housing.

  Therefore, the present invention provides a gas compressor provided with a housing that hermetically accommodates a gas compression mechanism for compressing gas, the housing having a cylindrical housing body that is open at one end and an annular shape of the housing body. A lid member that closes the open end, and the lid member has an annular butting surface that abuts on an end surface of the open end of the housing body, and the butting surface is formed on the butting surface from the butting surface. An annular projecting portion that rises along the inner peripheral wall of the opening edge portion of the open end is formed, and the housing body is disposed between the projecting portion and the inner peripheral wall of the open end portion facing the projecting portion. An annular sealing member for hermetically sealing between the lid member and the lid member is disposed.

  In the gas compressor according to the present invention, the lid member has an annular abutting surface that abuts the end surface of the open end of the housing body, and extends from the abutting surface along the inner peripheral wall at the edge of the open end of the housing body. An annular projecting portion that rises is formed. Since the overhanging portion extends inward of the housing body along the inner peripheral wall of the opening edge of the housing body, the overhanging portion has an increase in the outer diameter of the lid member or a thickness dimension as in the conventional case. Accordingly, an increase in the size of the housing and the accompanying increase in weight can be achieved by disposing an annular seal member between the overhanging portion and the inner peripheral wall of the housing body facing the overhanging portion. Without incurring, a reliable sealing between the housing body and the lid member is possible.

  A support member for holding the gas compression mechanism is fitted to the open end of the housing body so that the support member traverses the open end and faces the lid member, and the support member A step portion defining an annular recess for receiving the overhang portion may be formed on the outer edge of the surface facing the lid member in cooperation with the inner peripheral wall of the housing body.

  An annular groove that opens to the inner peripheral surface is formed on a surface of the overhanging portion that is received in the annular recess and faces the inner peripheral wall of the housing body, and the seal member can be accommodated in the annular groove. .

  According to the present invention, the lid member that closes the open end of the housing main body is provided with the overhanging portion that rises along the inner peripheral wall of the open end of the housing main body, and faces the overhanging portion and the overhanging portion. By disposing the seal member between the inner peripheral wall of the open end of the housing body, it is possible to reliably seal between the housing body and the lid member without incurring the overall size and weight of the housing. Thus, the gas compressor can be reduced in size and weight.

  The present invention will be described in detail below with reference to illustrated embodiments.

  The gas compressor according to the present invention is applied to, for example, an air conditioner mounted on an automobile and is used for a cooling cycle together with conventionally well-known condensers, expansion valves, evaporators, and the like that are components of the air conditioner. The refrigerant circulation path is configured.

  In the example shown in FIG. 1, the gas compressor 10 according to the present invention includes a cylindrical front housing member 12a having an open end formed with a suction port 11 connected to the evaporator (not shown), and the condensation. A discharge port 13 connected to a container (not shown) is formed, and a two-part housing 12 comprising a rear housing member 12b for closing the open end of the front housing member 12a is provided, and a gas compression mechanism 14 is provided in the housing. An electric motor 15 for driving the gas compression mechanism is housed in an airtight manner. The front housing member 12a constitutes a housing body that is open at one end, and the rear housing member 12b that closes the open end constitutes a lid member.

  The electric motor 15 is accommodated in a cylindrical portion 16a of the front housing member 12a, and a cylindrical electrical connector portion 17 is formed on the cylindrical portion so as to rise radially outward and open at the tip. . An electric plug 19 having a connection terminal 18 for supplying power to the electric motor 15 is airtightly fitted to the open end of the electric connector portion 17.

  The electric motor 15 is disposed around a rotor 15a provided on a rotating shaft 21 supported at one end by a bearing 20 provided on a closed end portion 16b of the front housing member 12a, and accommodated in the cylindrical portion 16a. And a cylindrical stator 15b. In the illustrated example, the electric motor 15 is a well-known multi-phase brushless DC motor, and the rotor 15a has alternating magnetic pole surfaces alternately in the circumferential direction of a cylindrical body made of a laminated body of silicon steel plates (not shown). The rotor is well known in the art and can be rotated integrally with the rotary shaft 21.

  In the illustrated example, the rotating shaft 21 has a large diameter portion 21 a where the gas compression mechanism 14 is provided, and a small diameter portion 21 c which is connected to the large diameter portion via a step portion 21 b and where the electric motor 15 is provided. The rotor 15a is fitted to the small diameter portion 21c so as to abut one end of the annular reinforcing member 23 fitted to the small diameter portion 21c in contact with the stepped portion 21b. A screw groove 21d is formed at the end of the small diameter portion 21c, and the rotor 15a is connected to the nut member 24 and the reinforcing member 23 of the step portion 21b by tightening the nut member 24 screwed into the screw groove 21d. Thus, the rotary shaft 21 is detachably coupled to each other. The reinforcing member 23 prevents the rotor 15a from receiving a localized concentrated load from the stepped portion 21b by tightening the nut member 24, thereby protecting the end surface of the rotor 15a. A key groove 25 for receiving a rotation prevention key (not shown) is formed in the small diameter portion 21c of the rotation shaft 21, and the rotation prevention key is applied between the rotation shaft 21 and the rotor 15a. And the relative rotation of both 15a and 21 can be prevented reliably.

  The stator 15b is composed of, for example, a cylindrical yoke 26 formed of a laminated body of silicon steel plates, and a field coil 27 wound around the yoke. The stator 15b is detached from the cylindrical portion 16a by a positioning mechanism 28. Fixed as possible.

  The positioning mechanism 28 includes a screw hole 28a that passes through the cylindrical portion from the inner peripheral wall 17a of the electrical connector portion 17 toward the inner peripheral wall 16c of the cylindrical portion 16a, and a hexagon socket set screw that is screwed into the screw hole. Alternatively, the groove 26a has a set screw 28b such as a slotted set screw, and the tip of the set screw 28b protruding into the cylindrical portion 16a from the screw hole 28a is formed on the outer peripheral surface of the yoke 26 of the stator 15b. Engage with. Since the screw hole 28a is angularly formed with respect to the rotating shaft 21, the set screw 28b is angularly engaged with the concave groove 26a formed in the axial direction of the yoke 26 from the oblique direction. By tightening the set screw 28b, the stator 15b can be removed to a predetermined position where one end of the yoke 26 is in contact with the step portion 16d formed in the cylindrical portion 16a in a state where rotation and axial movement are prevented. It is fixed to.

  The field coil 27 of the stator 15b receives a supply of multiphase pulse current through the connection terminal 18 of the electric plug 19 to generate a field, and the rotor is driven by the magnetic action between the field and the magnetic pole of the rotor 15a. When 15a rotates, the rotating shaft 21 rotates integrally with the rotation of the rotor 15a. Therefore, the rotating shaft 21 functions as an output shaft of the electric motor 15.

  The output shaft of the electric motor 15, that is, the rotary shaft 21 extends toward the open end of the front housing member 12a, and the large diameter portion 21a of the rotary shaft 21 has a support member 29 arranged across the open end of the front housing member 12a. To penetrate. A gas compression mechanism 14 is provided at the tip of the rotating shaft 21 that penetrates the support member 29.

  In the illustrated example, the gas compression mechanism 14 is a well-known vane rotary type gas compression mechanism. The vane rotary type gas compression mechanism 14 includes a cylinder 14a that defines a cylinder chamber, and a rotor 14b that is provided in the large-diameter portion 21a of the rotary shaft 21 and is rotatably disposed in the cylinder chamber. In the illustrated example, the cylinder 14a includes a cylindrical cylinder member 30a that defines a hollow portion having an elliptical cross section, and a front side block 30b and a rear side block 30c that are a pair of side blocks that close both ends of the cylinder member. The cylinder 14a defines a cylinder chamber whose cross section is not shown in the figure but is well known in the art.

  The cylinder 14a is received in a recess 29a formed on one side of the support member 29, whereby the gas compression mechanism 14 is held on the open end side of the front housing member 12a. A suction chamber 31 that communicates with the suction port 11 is formed on the other side of the support member 29, and a suction passage 32 that communicates the suction chamber 31 with the cylinder chamber is formed in the support member 29.

  As is well known, a rotor 14b of the gas compression mechanism 14 holds a vane 14c slidable on the peripheral wall of the cylinder chamber so as to advance and retreat. Each vane 14c defines a compression chamber (not shown) in the cylinder chamber by partitioning the cylinder chamber in the circumferential direction. When the rotor 14b of the gas compression mechanism 14 is rotated by driving rotation of the rotary shaft 21 that is an output shaft of the electric motor 15, each vane 14c slides on the cylinder peripheral wall as the rotor rotates. As the vanes 14c slide, the volumes of the compression chambers partitioned by the vanes 14c increase or decrease, as is well known.

  In the suction stroke in which the volume of the compression chamber increases, a refrigerant such as HFC134a is sucked into the cylinder chamber from the evaporator through the suction port 11, the suction chamber 31 and the suction passage 32 connected to the evaporator. The In the discharge stroke in which the volume of the compression chamber is reduced, compression is performed from the cylinder chamber to the condenser connected to the discharge port through the high pressure chamber 33 and the discharge port 13 formed inward of the rear housing member 12b. The received refrigerant gas is sent out.

  The high pressure chamber 33 is provided with an oil separator 34 for separating the lubricating oil contained in the refrigerant gas discharged from the gas compression mechanism 14 into the high pressure chamber 33 from the refrigerant gas. An oil reservoir 35 is provided for retaining the lubricating oil separated by the separator 34. In addition, a flange 36 is formed on the inner wall of the rear housing member 12 b for suppressing the lubricating oil in the oil reservoir 35 from being entrained in the refrigerant gas flow toward the discharge port 13. The lubricating oil in the oil reservoir 35 passes through a lubricating oil guide path which is omitted for simplification of the drawings, and each bearing portion 14d which receives the rotary shaft 21 of the gas compression mechanism 14 as is well known. , 14e to reduce friction, or to the rotor 14b for use as a back pressure of the vane 14c.

  In the gas compressor 10 according to the present invention, together with the front housing member 12a, the rear housing member 12b that constitutes the housing 12 that houses the gas compression mechanism 14 and the electric motor 15 should close the open end of the front housing member 12a. And an annular flange 38 that contacts the open end surface 37 of the front housing member 12a, and the flange contacts the open end surface 37 of the front housing member 12a at its butting surface 38a. The abutting surface 38 a is disposed so as to face the one side surface of the support member 29 and abut against the one side surface. A notch step 40 defining an annular recess 39 is formed on the outer edge of the surface 29b of the support member 29 facing the rear housing member 12b in cooperation with the opening edge of the front housing member 12a. . The annular recess 39 opens toward the rear housing member 12b on the open end surface 37 side of the front housing member 12a.

  On the other hand, a protruding portion 41 that is received in the annular recess 39 is formed on the abutting surface 38a formed on the flange 38 of the rear housing member 12b. The overhanging portion 41 extends along the inner peripheral wall 42 of the opening edge portion of the front housing member 12 a in the recess 39. An annular groove 43 that opens to the inner peripheral wall 42 is formed on the peripheral surface of the overhanging portion 41 facing the inner peripheral wall 42, and the annular groove 43 has a gap between the overhanging portion 41 and the inner peripheral wall 42. An annular seal member 44 that receives a compressive force is disposed.

  The rear housing member 12b is fastened to the front housing member 12a with a bolt that is not shown but is the same as the conventional one, with the seal member 44 provided on the overhanging portion 41 pressed against the inner peripheral wall 42 of the front housing member 12a. Is done. Thereby, the front housing member 12a and the rear housing member 12b are sealed, and the airtightness of the suction chamber 31 formed inside the front housing member 12a is ensured.

  In the gas compressor 10 according to the present invention, as a sealing mechanism that seals between a rear housing member 12b that is a lid member and a front housing member 12a that is a housing body, the gas compressor 10 contacts the open end surface 37 of the housing body 12a. An annular projecting portion 41 is formed on the annular butting surface 38a of the flange 38 of the lid member 12b so as to rise from the butting surface along the inner peripheral wall 42 of the opening edge of the housing body 12a. A seal member 44 is held in an annular groove 43 formed on the peripheral surface facing the inner peripheral wall 42.

  The seal member 44 reliably seals the space between the inner peripheral wall 42 at the opening edge of the front housing member 12a and the overhanging portion 41 of the rear housing member 12b that faces the inner peripheral wall. The airtightness between the members 12b is maintained.

  The protruding portion 41 of the rear housing member 12b that receives the seal member 44 with the front housing member 12a extends from the abutting surface 38a of the flange 38 of the rear housing member 12b along the inner peripheral wall 42 of the opening edge portion of the front housing member 12a. Therefore, there is no increase in the outer diameter or overall thickness of the flange 38 as in the prior art, and this overhanging portion 41 increases the size of the housing and increases the weight associated with the conventional housing. Will not be invited.

  Therefore, according to the gas compressor 10 according to the present invention, it is possible to reliably seal between the housing main body 12a and the lid member 12b without causing an overall increase in size and weight of the housing 12. Thus, the gas compressor 10 can be reduced in size and weight.

  The annular groove 43 of the overhanging portion 41 is not required, and the seal member 44 can be sandwiched between the overhanging portion 41 and the inner peripheral wall 42 of the front housing member 12a facing the overhanging portion. However, in order to hold the sealing member 44 at an appropriate predetermined position and thereby obtain a reliable airtightness, as shown in the illustrated embodiment, the annular groove 43 is formed on the surface of the projecting portion 41 facing the inner peripheral wall 29b. It is desirable to form and place the seal member 44 in the annular groove.

  The seal member 44 can be held on the inner peripheral wall 29b of the front housing member 12a instead of the overhanging portion 41.

  Although the example of the vane rotary type gas compression mechanism was shown as the gas compression mechanism 14 as described above, a scroll type and other compression mechanisms can be adopted as the gas compression mechanism. Moreover, although the present invention has been described with respect to the electric gas compressor in which the electric motor 15 is incorporated, it can be applied to a gas compressor that does not incorporate a drive source, and carbon dioxide gas can be used as a refrigerant.

It is sectional drawing of the gas compressor which concerns on this invention. It is sectional drawing of the conventional gas compressor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gas compressor 12 Housing 12a (Housing main body) Front housing member 12b (Lid member) Rear housing member 37 End surface of the open end of the housing main body 38a Butting surface of the lid member 39 Annular recess 41 Overhang portion 42 Opening edge of the housing main body Inner peripheral wall 43 annular groove 44 sealing member

Claims (3)

  A gas compressor provided with a housing that hermetically accommodates a gas compression mechanism for compressing gas, wherein the housing is a cylindrical housing body that is open at one end and a lid member that closes an annular open end of the housing body. And the lid member has an annular butting surface that abuts the end surface of the open end of the housing body, and the butting surface has an opening edge portion of the open end of the housing body from the butting surface. An annular projecting portion rising along the inner peripheral wall is formed, and between the housing main body and the lid member between the projecting portion and the inner peripheral wall of the open end facing the projecting portion. A gas compression mechanism comprising an annular seal member for hermetically sealing.   A support member for holding the gas compression mechanism is fitted to the open end of the housing body so as to cross the open end and face the lid member, and face the lid member of the support member. 2. The gas according to claim 1, wherein a stepped portion defining an annular recess for receiving the overhanging portion is formed in cooperation with the inner peripheral wall of the housing body at an outer edge of the surface to be formed. Compression mechanism.   The projecting portion is received in the annular recess, and an annular groove that opens to the inner peripheral surface is formed on a surface of the projecting portion that faces the inner peripheral wall of the housing body. The gas compression mechanism according to claim 2, wherein the seal member is accommodated.

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