CN101592154A - Compressor - Google Patents

Abstract

The invention discloses a kind of compressor.A kind of technology that realizes the normal freezing formation of molten drop that provides is provided.Have housing 21 that is formed with welding hole 21a and the stator 31 that is fixed in the inner peripheral surface of housing 21 by the molten drop Y that in described welding hole 21a, solidifies.Welding hole 21a, the mode that enlarges with the interior all side direction outer circumferential sides from housing 21 extends to form.

Description

Compressor

Technical field

The present invention relates to have the drive unit that is disposed at seal container inside and the compressor of compression set.

Background technique

As this technology, in patent documentation 1, the technology of the welding that relates to seal container is disclosed.Promptly, in the refrigerant gas of the so-called high pressure that uses carbon dioxide coolant etc., from guaranteeing the viewpoint of withstand voltage properties, compare in the time of with use freon class refrigeration agent, must increase the thickness of the member that constitutes seal container as far as possible, consequently, the thermal capacitance of seal container increases, and it is difficult that welding becomes.Therefore,,, can locally reduce the thickness of the member of formation seal container in order to solve described problem according to the record in the described patent documentation 1, and, the path of heat diffusion dwindled.

Patent documentation 1: TOHKEMY 2007-303329 communique

For fixing as the seal container that constitutes compressor member and with the pipeline of cylindric formation be contained in the stator and the main body cylinder block of prime mover of this seal container inside; generally; wear welding hole at described pipeline; use for example metal utmost point metal active gas arc welding connection (MAG welding process) and MIG (metal intert gas) welding connection (MIG welding process), in welding hole, flow into molten drop.

But, as previously mentioned, in the refrigeration agent of the so-called high pressure that uses carbon dioxide coolant etc.,, the thickness of described pipeline is increased from guaranteeing the viewpoint of withstand voltage properties, produced variety of problems thereupon.That is, for example, under the situation of using gases, gas can not flow in welding hole smoothly when welding by MAG welding process and MIG welding process etc., and consequently, the welding hole inner peripheral surface forms pneumatosis (ガ ス ま り).In addition, utilize under the arc-welding process situation of (the Arc welding process comprises MAG welding process and MIG welding process), at welding wire (perhaps welding rod, down with) and stator (perhaps main body cylinder block, apply voltage down together), Arc Discharge is taken place, still, if described duct thickness is big, no matter whether molten drop touches pipeline, all can cause producing Arc Discharge between welding hole inner peripheral surface and the welding wire, molten drop solidifies in welding hole lopsidedly.This problem is in the long-pending increase of the counter surface of pipeline and welding wire, particularly more remarkable when there is thickness in pipeline.

Therefore, in order to solve described problem, the present invention provides a kind of technology that realizes that the molten drop normal freezing forms to containing the compressor of welding fixation arrangement (member that is fixed that comprises cylindrical member that has formed welding hole and the inner peripheral surface that is fixed in described cylindrical member in described welding hole by the molten drop that solidifies).

Summary of the invention

The problem that the present invention solves as mentioned above, solution and the implementation result to problem describes below.

The compressor that first aspect present invention is relevant has the member that is fixed of cylindrical member that is formed with welding hole and the inner peripheral surface that is fixed in described cylindrical member in described welding hole by the molten drop that solidifies.Welding hole extends to form in the mode that the interior all side direction outer circumferential sides from cylindrical member enlarge.

This compressor can realize that the normal freezing of molten drop forms.Specifically, when molten drop flowed into, molten drop was difficult to form uneven in welding hole.Therefore, can provide and have drop is difficult to form unbalanced suitable welding fixation arrangement in welding hole compressor.

The compressor that second aspect present invention is relevant, on the relevant compressor of first aspect, welding hole extends to form in the mode that taper enlarges.In addition, the compressor that third aspect present invention is relevant, on the relevant compressor of first aspect, welding hole extends to form in the mode of stepped expansion.

In these compressors, welding hole can cheaply form.

The compressor that fourth aspect present invention is relevant first to the relevant compressor of the third aspect, has and is contained in drive unit cylindrical member inside, that comprise rotor and be disposed at the stator in the rotor radial outside.And the member that is fixed is a stator.

In this compressor, imbalance does not take place in welding hole inside in molten drop, and stator can be welded on the cylindrical member suitably.

The compressor that fifth aspect present invention is relevant on compressor relevant aspect first to fourth, has the cylinder cap member that is contained in cylinder body cylindrical member inside, that have pressing chamber and is disposed at the cylinder body end face.And the member that is fixed is at least a of cylinder body and cylinder cap member.

In this compressor, imbalance does not take place in molten drop in welding hole, constitutes the cylinder body of compression set and at least a can being welded on the cylindrical member suitably in the cylinder cap member.

The compressor that sixth aspect present invention is relevant, on the basis of compressor relevant aspect first to fourth, has the support member that is contained in cylinder body cylindrical member inside, that have pressing chamber and the cylinder cap member that is disposed at the cylinder body end face and cylinder body and cylinder cap member are supported.And the member that is fixed is a support member.

In this compressor, imbalance does not take place in molten drop in welding hole, can will support the member of compression set to be welded on the cylindrical member.And, be not member other welding, but can compression set integral body be fixed suitably by this support member is welded on the cylindrical member to constituting compression set.

The compressor that seventh aspect present invention is relevant, on compressor relevant aspect first to the 6th, the thickness of cylindrical member that is formed with welding hole is more than 4mm.

In this compressor, can be suitably the cylindrical member of the above thickness of 4mm that is difficult to carry out suitable welding be traditionally welded, therefore, the refrigeration agent (for example carbonic acid gas) that can adopt the thickness thickening that need make seal container is as refrigeration agent.

The compressor that eighth aspect present invention is relevant on compressor relevant aspect first to the 7th, adopts carbonic acid gas as refrigeration agent.

When adopting carbonic acid gas, because the thickness of described cylindrical member increases, at this time the technical meaning of described weld fixture apparatus is more obvious.

As described above described, adopt the present invention, can obtain following effect.

In the 1st aspect, can realize that the normal freezing of molten drop forms.Specifically, when molten drop flowed into, molten drop was difficult to form uneven in welding hole.Therefore, can provide and have drop is difficult to form unbalanced suitable welding fixation arrangement in welding hole compressor.

In the 2nd and the 3rd aspect, can form welding hole at an easy rate.

In the 4th aspect, imbalance does not take place in welding hole inside in molten drop, and stator can be welded on the cylindrical member suitably.

In the 5th aspect, imbalance does not take place in molten drop in welding hole, and the cylinder body and the cylinder cap member that constitute compression set can be welded on the cylindrical member suitably.

In the 6th aspect, imbalance does not take place in molten drop in welding hole, can will support the member of compression set to be welded on the cylindrical member.And, be not member other welding, but can compression set integral body be fixed suitably by this support member is welded on the cylindrical member to constituting compression set.

In the 7th aspect, can be suitably the cylindrical member of the above thickness of 4mm that is difficult to carry out suitable welding be traditionally welded, therefore, the refrigeration agent (for example carbonic acid gas) that can adopt the thickness thickening that need make seal container is as refrigeration agent.

In the 8th aspect, provide a kind of compressor that adopts carbonic acid gas as refrigeration agent.When adopting carbonic acid gas, because the thickness of described cylindrical member increases, at this time the technical meaning of described weld fixture apparatus is more obvious.

Description of drawings

Fig. 1 is the sectional axonometric drawing of the relevant compressor of the 1st mode of execution of the present invention.

Fig. 2 is the enlarged view of the relevant welding fixation arrangement of the 1st mode of execution of the present invention.

Fig. 3 is the enlarged view of the relevant welding fixation arrangement of the 1st mode of execution of the present invention.

Fig. 4 is the schematic representation of the relation of expression thickness of cylindrical member and failure welding rate.

Fig. 5 is the enlarged view of the relevant welding fixation arrangement of the 2nd mode of execution of the present invention.

Fig. 6 is the enlarged view of the relevant welding fixation arrangement of the 3rd mode of execution of the present invention.

Fig. 7 is the sectional axonometric drawing of an example of the present invention's compressor of being correlated with.

Fig. 8 is the sectional axonometric drawing of an example of the present invention's compressor of being correlated with.

Symbol description

1 compressor

21 housings

The 21a welding hole

31 stators

41 cylinder bodies

43 front end housings

44 back cylinder covers

51 compression set support member

90 welding wires

100,110,120 welding fixation arrangements

Embodiment

Below, preferred implementation of the present invention is described.

(the 1st mode of execution)

Fig. 1 is the sectional axonometric drawing of the relevant compressor of the 1st mode of execution of the present invention.Compressor 1 is, for example, is assembled in the compressor of the freeze cycle (not having diagram) of aircondition etc., will compress the refrigeration agent discharge after will compress from the discharge tube 25 that is disposed at the upper end portion by absorbing silencer 2 from the refrigeration agent that freeze cycle imports.As shown in Figure 1, compressor 1 has casing 11, motor 12 and compression set 13.

(casing)

Casing 11 is made of housing 21 (cylindrical member), top 22 and bottom 23.Housing 21 is members roughly cylindraceous that above-below direction extends, its upper and lower end opening.In addition, in the side of housing 21, bottom righthand side among the figure forms the suction pipe 24 that imports refrigeration agent from freeze cycle.Top 22 is the members with the closure of openings of housing 21 upper ends.In addition, top 22 is provided with described discharge tube 25.Bottom 23 is the members with the closure of openings of housing 21 lower ends.Thus, at casing 11, form the confined space 26 that housing 21, top 22 and bottom 23 surround.

(motor)

Motor 12 is disposed at confined space 26 inside, has stator 31 (member is fixed) and rotor 32.Stator 31 is fixedly welded on the internal face of housing 21.Rotor 32 is disposed at the radially inner side of stator 31, at its substantial middle position, is fixed with the upper end portion of the axle 80 that above-below direction extends.In the motor 12, by the magnetic force that produces between stator 31 and the rotor 32, rotor 32 rotates with axle 80.Wherein, the formation of stator 31 and rotor 32 is identical with traditional motor, therefore omits its detailed explanation here.

(compression set)

Compression set 13 in confined space 26, is positioned at the below of motor 12.Compression set 13 is to have not have the what is called of the integrally formed piston of the blade of expression to shake piston type compressed device among roller 42 described later and the figure, as shown in Figure 1, have cylinder body 41 (member is fixed), roller 42 (piston), front end housing 43, back cylinder cover 44 and preceding baffler (マ Off ラ) 45.Described axle 80 extends downwards from motor 12, baffler 45, cylinder body 41, roller 42, front end housing 43 and back cylinder cover 44 before connecting.Wherein, compression set 13 is not limited by described form, can be the so-called twin-tub build compression set with 2 cylinder bodies, can be 2 grades of compression-types yet.In addition, compression set 13 is not limited by roller 42 and the integrally formed mode of blade, can be the two rotary-type compression set that separates yet.

Cylinder body 41 is fixedly welded on the housing 21, and at its substantial middle position, it is the cylinder body chamber 71 of circular that above-below direction connects cylinder body 41 formation plane views.On the cylinder body 41, form to connect cylinder body chamber 71, from cylinder body chamber 71 to the importing stream 72 of the right-hand extension of Fig. 1, suction pipe 24 is connected in and imports stream 72.Thus, import the refrigeration agent of compressor 1, flow in the cylinder body chamber 71 by importing stream 72.

Roller 42 has the plane shape of circular, is disposed at the inside of cylinder body chamber 71.In addition, the substantial middle position of roller 42 forms the through hole 42a of circular, and the eccentric part described later 81 of rotatingshaft embeds through hole 42a.Then, be accompanied by the rotation of axle 80 and eccentric part 81, roller 42 moves along the wall of cylinder body chamber 71, and thus, the refrigeration agents in the cylinder body chamber 71 are compressed.Then, the refrigeration agent after the compression, the discharge stream by there not being expression among the figure 71 are discharged confined spaces 26 from the cylinder body chamber.Wherein, identical by the mobile process that refrigeration agents in the cylinder body chamber 71 are compressed of roller 42 with traditional compressor, omit its detailed description here.

Front end housing 43 is engaged in the top of cylinder body 41, with the closure of openings of the upper surface of cylinder body chamber 71.Back cylinder cover 44 is engaged in the bottom of cylinder body 41, with the closure of openings of the lower surface of cylinder body chamber 71.

Preceding baffler 45 is bafflers of being located at the lid shape of the side that covers front end housing 43, and the refrigeration agent that spues from the hole that spues (not having diagram) of being located at front end housing 43 is carried out noise reduction.

(axle)

Below axle 80 is described in detail.Axle 80, as previously mentioned, rotor 32 is fixed in its upper end, and above-below direction extends the preceding baffler 45 of perforation, front end housing 43, cylinder body 41, roller 42 and back cylinder cover 44.In addition, in the position part (with cylinder body chamber 71 corresponding parts) contour of axle 80, be provided with the eccentric part 81 of the rotating shaft of central shaft off-axis 80 with cylinder body 41, roller 42.As mentioned above, eccentric part 81 embeds among the through hole 42a of roller 42.

(welding fixation arrangement)

Below, the welding stationary state of described housing 21 (cylindrical member), stator 31 (member is fixed) and cylinder body 41 (member is fixed) is described in detail.In the following description, the welding stationary state of housing 21 and cylinder body 41 is described, on the other hand, to the welding stationary state of housing 21 and stator 31, the explanation relevant with cylinder body 41 is the same, and it is omitted explanation.

Fig. 2 is the enlarged view of the relevant welding fixation arrangement of the present invention's the 1st mode of execution, (a) the relevant welding fixation arrangement of expression conventional example, (b) the relevant welding fixation arrangement of expression the 1st mode of execution.Wherein, the welding fixation arrangement that the 1st mode of execution is relevant is a dotted line institute area surrounded among Fig. 1, promptly is located between housing 21 and the cylinder body 41 and between housing 21 and the stator 31.

The welding fixation arrangement 100 that the 1st mode of execution is relevant, shown in Fig. 2 (b), by being fixed in the inner peripheral surface of housing 21 and constituting as the cylinder body 41 of the member that is fixed as the housing 21 of the cylindrical member that has formed welding hole 21a with by the molten drop Y that in welding hole 21a, solidifies.Welding hole 21a extends to form from interior all side direction outer circumferential side of housing 21 with enlarging.Be that welding hole 21a enlarges ground formation with taper.The section shape of this welding hole 21a is circular (also can be oval) in the present embodiment.On the other hand, shown in Fig. 2 (a), the welding hole 21a described in the conventional example forms straight circular port from interior all side direction outer circumferential sides of housing 21.

Under this state, welding wire 90 is inserted among the welding hole 21a, it is coaxial that welding wire 90 and welding hole 21a are formed, and makes welding wire 90 conducts+utmost point, and cylinder body 41 and housing 21 apply for example voltage about 5kV as a utmost point between welding wire 90 and cylinder body 41 and housing 21.Like this, Arc Discharge takes place between cylinder body 41 and welding wire 90 and produce local pyrexia, the front end fusing back of welding wire 90 is attached on the cylinder body 41 as molten drop Y and solidifies.That is to say that by the heating functioin that Arc Discharge causes, the fusing of the front end of welding wire 90 forms molten drop Y, molten drop Y flows in the welding hole 21a.

At this moment, in the conventional example shown in Fig. 2 (a), because the inner peripheral surface of welding hole 21a dwindles with the clearance G between the welding wire 90, cause and betiding between the inner peripheral surface and welding wire 90 of welding hole 21a at the Arc Discharge that freezes solidly on generation between molten drop Y on the cylinder body 41 and the welding wire 90.Therefore, the heating in the welding hole 21a distributes significantly imbalance takes place, and after this, molten drop Y imbalance takes place in welding hole 21a solidifies.Especially, with CO ₂In the compressor as refrigeration agent, the thickness setting of housing 21 gets bigger, and therefore, the surface area of housing 21 relative welding wires 90 increases, and the incidence rate of the Arc Discharge between housing 21 and the welding wire 90 significantly increases.

In the relevant welding fixation arrangement 100 of the 1st mode of execution, shown in Fig. 2 (b), owing to can fully guarantee the inner peripheral surface of welding hole 21a and the clearance G between the welding wire 90, can making, the Arc Discharge between molten drop Y that solidifies on the cylinder body 41 and welding wire 90 continues to take place.Therefore, in the present embodiment, in welding hole 21a, can realize the normal of molten drop Y, what just do not produce circumferencial direction unbalancedly solidifies formation.

Fig. 3 is the enlarged view of the relevant welding fixation arrangement of the 1st mode of execution of the present invention, (a) the relevant welding fixation arrangement of expression conventional example, (b) the relevant welding fixation arrangement of expression the 1st example.

In Fig. 2, pointed out general way to solve the problem when utilizing the Arc Discharge welding.With respect to this, peculiar problem and solution when the gas blowing that the welding part is carried out carbonic acid gas etc. causes, adopts so-called MAG welding and MIG welding among Fig. 3, have been pointed out in Arc Discharge.Conventional example shown in Fig. 3 (a), if the thickness of housing 21 is thick, gas was difficult to circulate in welding hole 21a when then molten drop Y flowed in the welding hole 21a, caused the instability of gas flow, and the so-called cavity of representing as symbol H takes place.

With respect to this, in the present embodiment, shown in Fig. 3 (b),, also can fully guarantee the free air space (passage) of gas even molten drop is to a certain degree solidification-stack shape on the cylinder body 41, therefore, gas can circulation successfully in welding hole 21a.Therefore, in welding hole 21a, can realize the normal freezing formation of molten drop Y.

Relation when Fig. 4 represents to adopt traditional welding fixation arrangement between the reject ratio of the thickness W of housing 21 and welding.In traditional welding fixation arrangement, as implied above, along with the thickness W of housing 21 thickens, in the time of Arc Discharge, Arc Discharge incidence rate between the inner peripheral surface of welding hole 21a and the welding wire 90 increases, in the time of MAG welding and MIG welding, instability takes place in the circulation of the gas that sprays in the welding part easily.Especially, when the thickness W of housing 21 reaches 4mm when above, shown in the dotted line of Fig. 4, failure welding takes place.On the other hand, in the welding fixation arrangement that present embodiment is correlated with, the discharge during Arc Discharge between molten drop Y and the welding wire 90 is kept, when MAG welding and MIG welding gas jet flow also keep stable, therefore, shown in the solid line of Fig. 4, failure welding reduces.Therefore, the welding fixation arrangement that present embodiment is relevant is effective when reaching more than the 4mm to the thickness W of housing 21.

(feature of the compressor that the 1st mode of execution is relevant)

The compressor that the 1st mode of execution is relevant has following feature:

In the welding fixation arrangement 100 that the 1st mode of execution is correlated with, owing to can fully guarantee the inner peripheral surface of welding hole 21a and the clearance G between the welding wire 90, the Arc Discharge that the generation between molten drop Y that solidifies on the cylinder body 41 and welding wire 90 continues.Therefore, in welding hole 21a, the unbalanced formation of solidifying can not take place at circumferencial direction in molten drop.

(the 2nd mode of execution)

In described the 1st mode of execution, described welding hole 21a enlarges with taper from interior all side direction outer circumferential sides of housing 21 and to form.With respect to this, in the present embodiment, welding hole 21a forms with stepped expansion from interior all side direction outer circumferential sides of housing.Fig. 5 is the enlarged view of the relevant welding fixation arrangement 110 of the 2nd mode of execution of the present invention.

Welding fixation arrangement 110 as shown in Figure 5, owing to be that interior all side direction outer circumferential sides from housing 21 form with stepped expansion, can fully guarantee the inner peripheral surface of welding hole 21a and the gap between the welding wire 90.Therefore, when molten drop Y grows up, do not produce Arc Discharge between the interior all sides of welding hole 21a and the welding wire 90, and between molten drop Y and the welding wire 90 lasting Arc Discharge takes place.

(feature of the compressor that the 2nd mode of execution is relevant)

The compressor that the 2nd mode of execution is relevant has following feature:

In the welding fixation arrangement 110 that the 2nd mode of execution is correlated with, the welding fixation arrangement 100 relevant with the 1st mode of execution is identical, owing to can fully guarantee the inner peripheral surface of welding hole 21a and the space between the welding wire 90, the Arc Discharge that the generation between molten drop Y that solidifies on the cylinder body 41 and welding wire 90 continues.Therefore, in welding hole 21a, the unbalanced formation of solidifying can not take place at circumferencial direction in molten drop.

(the 3rd mode of execution)

In the 1st mode of execution, described welding hole 21a enlarges with taper from interior all side direction outer circumferential sides of housing 21 and to form, and in addition, in the 2nd mode of execution, welding hole 21a forms with stepped expansion from interior all side direction outer circumferential sides of housing 21.The welding fixation arrangement 120 that present embodiment is relevant, composite construction with welding fixation arrangement of the described the 1st and the 2nd mode of execution, welding hole 21a, is a hole with certain diameter from interior all sides of welding hole 21a till the predetermined distance of outer circumferential side, and beginning to outer circumferential side from described predetermined distance then is a hole with the structure that enlarges with taper.

By having such structure, in Arc Discharge, welding hole 21a is owing to have the shape that enlarges to outer circumferential side, Arc Discharge does not take place between the inner peripheral surface of welding hole 21a and the welding wire 90, in MAG welding and MIG welding, gas jet is difficult to form cavity easily to the periphery side flow.Therefore, even the thickness W of housing 21 thickens the generation that also can suppress failure welding.

(feature of the welding fixed structure that the 3rd mode of execution is relevant)

The compressor that the 3rd mode of execution is relevant has following feature:

In the welding fixation arrangement 120 that the 3rd mode of execution is correlated with, owing to can fully guarantee the inner peripheral surface of welding hole 21a and the gap between the welding wire 90, lasting Arc Discharge has taken place between molten drop Y that solidifies on the cylinder body 41 and welding wire 90, cylinder body 41 can be fixed in housing 21 suitably.

In addition, in the time of MAG welding and MIG welding, because the outer circumferential side of welding hole 21a is tapered, gas jet is easy to the circulation of outer circumferential side, and so-called cavity does not take place, and cylinder body 41 can be fixed in housing 21 suitably.

More than, based on accompanying drawing embodiments of the present invention being had been described in detail, concrete formation can not be subjected to the qualification of these mode of executions.Scope of the present invention is not only the explanation of described mode of execution, has also comprised the meaning of scope equalization shown in claims and claim and the whole changes in the scope.

In described each example, as fixed part, but be not limited thereto with stator 31 and cylinder body 41, for example, as shown in Figure 7, contact with the inner circle wall face of housing 21 with back cylinder cover 44 by front end housing 43, also can be with front end housing 43 and back cylinder cover 44 as fixed part.At this moment, welding hole for example, is located at the dotted line institute area surrounded of Fig. 7.Wherein, baffler 45 is fixed in the upper surface of front end housing 43, is face (Off エ イ ス) shape.

In addition, as shown in Figure 8, also can be the compression set support member 51 of fixing compression set 13 as the member that is fixed.Compression set support member 51 has the diameter roughly the same with the internal face of housing 21, is the disc-shaped component that has in the chimeric hole of about central position and front end housing 43, and its edge erects upward.Compression set support member 51 is connected with bolt by front end housing 43, in the zone of the dotted line of Fig. 8, with housing 21 welding.Therefore, by with compression set support member 51 as the member that is fixed, compression set 13 is fixed in housing 21 by compression set support member 51.

In described each mode of execution, welding hole 21a cross section is circular, but is not limited, and the cross section also can be oval.

In addition, in described the 2nd mode of execution, the inner peripheral surface of welding hole 21a is provided with a step, also can be provided with the step more than 2 or 3.

Described compressor 1 adopts carbonic acid gas as refrigeration agent.Because when adopting carbonic acid gas, the thickness of housing 21 (cylindrical member) increases, described at this time welding fixation arrangement 100,110 and 120 meaning technically is more obvious.

The possibility of utilizing on the industry

Utilize the present invention, can realize that the normal freezing of molten drop Y forms. Specifically, molten drop Y When flowing into, molten drop Y is difficult to take place uneven in described welding hole 21a.

Claims (8)

1. a compressor is characterized in that, comprising:

Be formed with the cylindrical member of welding hole; With

Be fixed in the member that is fixed of the inner peripheral surface of described cylindrical member by the molten drop that in described welding hole, solidifies,

Described welding hole extends to form in the described mode that enlarges from interior all side direction outer circumferential sides of cylindrical member.

2. the compressor described in claim 1 is characterized in that:

Described welding hole extends to form in the mode that taper enlarges.

3. the compressor described in claim 1 is characterized in that:

Described welding hole extends to form in the mode of stepped expansion.

4. as each described compressor in the claim 1～3, it is characterized in that:

Have and be contained in driving mechanism in the described cylindrical member, that comprise rotor and be disposed at the stator in the described rotor radial outside,

The described member that is fixed is described stator.

5. compressor as claimed in claim 1 is characterized in that:

Have be contained in the described cylindrical member, the cylinder body that pressing chamber is arranged and the cylinder cap member that is disposed at described cylinder body end face,

The described member that is fixed is at least one of described cylinder body and described cylinder cap member.

6. compressor as claimed in claim 1 is characterized in that:

Have be contained in the described cylindrical member, the cylinder body that pressing chamber is arranged and the cylinder cap member that is disposed at described cylinder body end face and support member that described cylinder body or described cylinder cap member are supported,

The described member that is fixed is described support member.

7. compressor as claimed in claim 1 is characterized in that:

The thickness of described cylindrical member that is formed with welding hole is more than 4mm.

8. compressor as claimed in claim 1 is characterized in that:

Adopt carbonic acid gas as refrigeration agent.

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