CN1071003C

CN1071003C - Piston type compressor

Info

Publication number: CN1071003C
Application number: CN96113311A
Authority: CN
Inventors: 池田勇人; 横井雅宣; 川村尚登; 道行广美
Original assignee: Toyoda Automatic Loom Works Ltd
Current assignee: Toyota Industries Corp
Priority date: 1995-08-21
Filing date: 1996-08-20
Publication date: 2001-09-12
Anticipated expiration: 2016-08-20
Also published as: KR970011389A; JPH0960588A; KR100203974B1; CN1150619A

Abstract

To miniaturize the whole compressor and to decrease the weight in a cam plate-type compressor provided with a relief valve. A relief valve 38 is attached to a rear housing 14 in which a suction chamber 27 and a delivery chamber 28 are formed by being sectioned, so as to be housed in the thickness. A pressure receiving port 42 of the relief valve 38 is communicated with the delivery chamber 28. When gas pressure in the discharging chamber 28 is abnormally increased beyond the prescribed value, the relief valve 38 is released, and gas pressure is decreased.

Description

Piston compressor

The present invention relates to swash plate class piston compressor.Particularly relate to and the sort ofly have relief valve so that from the piston compressor of output cavity release pressure.

In vehicle, compressor is generally used for the air-conditioning in main cabin.Compressor compresses is aspirated the cooling gas of returning from the external refrigeration loop, and then compressed refrigerant gas is sent back to outer refrigeration loop.

Fig. 5 represents known oblique tray type compressor.Periphery top at cylinder body 51 is provided with output flow silencing apparatus 52, has anechoic room 52a anechoic room 52a to link to each other with a pair of output flow chamber that forms on front case 53 and rear case (not shown) respectively in the output flow silencing apparatus 52.On the sidewall of output flow silencing apparatus 52, be provided with Pressure relief valve 54, relief valve 54 has an inlet 54a who is exposed among the anechoic room 52a, when the gas pressure among the anechoic room 52a surpasses predetermined value and becomes too high, the 54a that then enters the mouth opens the cooling gas that discharges in the anechoic room 52a, and this has just laid down the pressure among the anechoic room 52a and has made pressure get back to suitable numerical value.

Yet relief valve 54 is arranged in from the sidewall of the silencing apparatus 52 outside output flow silencing apparatuss of giving prominence to 52, the overall weight that this has just strengthened the size of compressor and has increased compressor.

The purpose of this invention is to provide a kind of compact structure, lightweight piston compressor.

To achieve these goals, compressor of the present invention comprises a cylinder body with cylinder hole, a rotatingshaft that is rotatably supported in the cylinder body, and a drive plate that is installed on the rotatingshaft and is connected with drive plate and places piston in the cylinder hole.One is connected to the housing that forms the output chamber on the cylinder body.Drive plate converts rotatablely moving of rotating shaft the to-and-fro motion of piston in the cylinder hole to, with compression be input in the cylinder hole gas and with compressed gas drain into output the chamber.Housing has an outer surface, and relief valve discharges the pressure of output chamber so that export indoor pressure and remain in the prespecified range, and relief valve is contained in the housing outer surface, and relief valve has an inlet of also therefrom accepting its pressure that communicates with the output chamber.

The feature of novelty of the present invention has been done elaboration in the claims in detail.Purpose of the present invention and advantage thereof are by being better understood with reference to the most preferred embodiment of hereinafter describing in conjunction with respective drawings.

Fig. 1 is the longitudinal section of first embodiment of the invention oblique tray type compressor;

Fig. 2 is the sectional elevation along 2-2 line intercepting among Fig. 1;

Fig. 3 is the local amplification view of relief valve fixed structure;

Fig. 4 is the local amplification view of second embodiment of the invention relief valve fixed structure;

Fig. 5 is the front view of known oblique tray type compressor.

Hereinafter describe the oblique tray type compressor of first embodiment of the invention in detail referring to figs. 1 through Fig. 3.

As shown in Figure 1, a pair of cylinder body 11 interconnects.A pair of cylinder body 11 constitutes main casing, and front case 12 links to each other with the front end of a pair of cylinder body 11 that valve plate 13 wherein is housed; Rear case 14 links to each other with the rear end of a pair of cylinder body 11 that another valve plate 13 wherein is housed.Crankshaft room 23 extends between a pair of cylinder body 11 and decides.

A plurality of bolts 15 pass front case 12, and cylinder body 11 and valve plate 13 back lemons are gone in the corresponding tapped hole 16 that forms on rear case 14, and bolt 15 is fastened on the front end and back end that is linked to be a pair of cylinder body 11 forward and backward housing 12,14.

The center of front case 12 and cylinder body 11 is passed in rotating shaft 17, a pair of radial bearing 18 rotatably supports of axle 17 usefulness, Sealing 19 is contained between the front end and front case 12 of axle 17, prevent that gas from spilling from crankcase 23, axle 17 controllably links to each other with the outer driving source (not shown) of motor class and drives its rotation by driving source.

Extend in cylinder body 11 with axle 17 with paralleling in the cylinder hole 20 of a pair of aligning, the axis shadow in a plurality of cylinders hole 20 becomes an imaginary circumference, its axis coincides with the axis of axle 17, leave certain interval between the cylinder hole 20 of a pair of centering that each is adjacent, double-head piston 21 is contained in each cylinder hole 20 to centering.In each cylinder hole 20, between the end face of piston 21 and relative valve plate 13, form pressing chamber 22.

Swash plate 24 is fixed on the axle 17 in the crankshaft room 23, and swash plate 24 links to each other with the middle part of each piston 21 by a pair of half slot 25, and therefore, swash plate 24 changes rotatablely moving of axle 17 linear reciprocating motion of each piston 21 in its cylinder hole 20 separately into.Be shaped on hole 24a in the center portion of swash plate 24, thrust-bearing 26 is installed between the inwall of the side of boss 24a and corresponding cylinder body 11, and the fixed-site that thrust-bearing 26 remains between the cylinder body 11 swash plate 24 is constant.

As depicted in figs. 1 and 2, be shaped on ring-type suction chamber 27 on the excircle part of front case 12 and rear case 14, each suction chamber 27 all passes through the inlet hole (not shown) and links to each other with external refrigeration loop (not shown).Form annular output chamber 28 in the inside of forward and backward housing 12,14, upper limb at cylinder body 11 is provided with output flow silencing apparatus 29, in output flow silencing apparatus 29, be shaped on anechoic room 29a, anechoic room 29a links to each other with each output chamber 28 by output channel 30, and output channel 30 is passed relevant cylinder body 11 and valve plate 13.The delivery outlet of making on output flow anechoic room 29 tops 31 make anechoic room 29a with outside refrigerating circuit be connected.

Each valve plate 13 comprises several suction ports 13a, suction valve 13b, delivery outlet 13c and delivery valve 13d, and they are corresponding with a cylinder hole 20 separately.At suction stroke, when the piston head of each piston 21 when top dead center moves to bottom dead center, refrigerant gas in the corresponding suction chamber 27 is opened corresponding suction valve 13b, and through in the corresponding suction port 13a inflow corresponding compression chambers 22, in compression stroke, when the piston of this piston 21 altogether when lower dead centre moves to upper dead center, the refrigerant gas in the pressing chamber 22 is at first by compression, subsequently, compressed gas is opened corresponding delivery valve 13d and is flowed into output chamber 28 by corresponding delivery outlet 13c.

As shown in Figures 1 to 3, fixed hole 34 passes the center of rear case 14 along the axis of axle 17, and fixed hole 34 is included in its inboard helical thread portion 35 that forms, and is arranged with bypass channel 36 in the lower edge of fixed hole 34.At the rear case 14 inboard passages 37 that form fixed hole 34 is linked to each other with corresponding output chamber 28.

Relief valve 38 is used to discharge too high delivery pressure.Relief valve 38 comprises the main casing of being made by metallic material, for example aluminium 40, and the shape of main casing 40 is as bolt, and the one end is shaped on screw thread 41, and the screw thread 41 of main casing 40 is screwed in the helical thread portion 35 of fixed hole 34, and main casing 40 is connected on the back cover 14.Lip ring 39 is installed between fixed hole 34 and the main casing 40.

As shown in Figure 3, the length of relief valve 38 less than the width H of rear case 14, therefore, whole relief valve 38 is positioned within the width H of rear case 14.In addition, as shown in Figure 2, relief valve 38 is fixed on the center of rear case 14, and the annular output chamber 28 in the rear case 14 is around relief valve 38.This structure makes that outputing to cooling gas in the corresponding output chamber 28 in the pressing chamber 22 can flow to output channel 30 reposefully and be not subjected to stopping of relief valve 38.In other words, in the position that relief valve 38 is connected with rear case 14, valve 38 does not hinder cooling gas and flows to output channel 30.

As shown in Figure 3, main body 40 is hollow, forms inner chamber 40a in it, the inlet 42 that is positioned at main body 40 tail end places makes inner chamber 40a link to each other with passage 37, middle part at the outer wall of main body 40 is shaped on pressure overflow hole 43, and overflow hole 43 communicates with chamber 40a, and its outlet is opened wide to bypass channel 36.

Valve body 44 is installed among the 40a of chamber movably.As shown in Figure 3, rubber seal 46 is fixed on the end of valve body 44, and pad 46 is close on the valve seat 45 of main body 40, and pad 46 is by 42 pressure that bear in the passage 37 that enter the mouth.Just fill up 46 pressure that bear in the corresponding output chamber 28, spring seat 48 is fixed on the outer end of main body 40 in the mode of enclosed cavity 40a, and helical spring 47 is arranged between valve seat 48 and the valve body 44, and helical spring 47 is pressed to valve seat 45 with valve body 44.

When compressor quits work, maybe when the pressure of the refrigerant gas in the output chamber 28 was lower than predetermined value, valve body 44 interior pads 46 were pressed towards valve seat 45, state promptly shown in Figure 3.At this state, the path that valve body 44 cuts off between inlet 42 and the overflow hole 43.When compressor operating and when exporting pressure in the chamber 28 and surpassing predetermined value and become too high, valve body 44 overcomes the thrust of helical spring 47 and moves well from valve seat 45, and inlet 42 passages by chamber 40a are communicated with overflow hole 43.

The work of oblique tray type compressor mentioned above hereinafter will be described.

The outer driving source live axle 17 that is made of analogs such as motors rotates with swash plate 24, the rotation of swash plate 24 is converted to the linear reciprocating motion of the piston 21 that is positioned at cylinder body 20 by corresponding guide groove 25, the to-and-fro motion of piston 21 by suction chamber 27 is drawn into the pressing chamber 22 that cylinder hole 20 in limit from outer refrigeration loop cooling gas, cooling gas pressurized in pressing chamber 22 contracts and delivers to output chamber 28, and cooling gas is delivered to anechoic room 29a and is input to outer refrigeration loop by delivery outlet 31 by output channel 30 then.

When with output chamber 28 that relief valve 38 links to each other in pressure when surpassing predetermined value and becoming too high, the valve bodies 44 in the relief valve 38 overcome the thrust of helical spring 47 to be removed from valve seat 45, and inlet 42 is connected with overflow hole 43.Refrigerant gas in the output chamber 28 flows through passage 37 like this, inlet 42, and cavity 40a, overflow hole 43 and bypass channel 36 release in compressor, and lay down the pressure in the output chamber 28 and make it to get back to suitable force value.Therefore, this structure can be avoided the overpressure of compressor.

The fixed hole 34 that forms in rear case 14 makes relief valve 38 be connected with housing 14, and whole relief valve 38 remains in the scope of width H of rear case 14.Like this, different with the compressor of known technology, relief valve 38 does not stretch out the outside of output flow silencing apparatus 29, does not promptly give prominence to the outer surface of rear case 14, and this spline structure diminishes the compressor product, lightens.

The mode that relief valve 38 flows with the cooling gas that does not stop in the output chamber 28 is installed in the center of rear case 14, particularly, relief valve 38 is not exposed in the output chamber 28, but be exposed to and export the passage 37 that chamber 28 links to each other, therefore, the cooling gas of output steadily flow to output channel 30 and are not subjected to the obstruction of relief valve 38 in output chamber 28 in the relevant pressing chamber 22.

The overflow hole 43 that forms in main body 40 walls extends along the downward direction of Fig. 3, like this, as shown in Figure 3, from output chamber 28 several cold air after it disengages, at first flow downward by overflow hole 43, flow along the bottom surface of bypass channel 36 on (right side of Fig. 1) then backward, and cooling gas is discharged from the rear side of rear case 14.When rear case 14 discharges cooling gas backward, this structure decrease the active force of cooling gas.Therefore, the part that the is arranged in rear case 14 back lubricated wet goods that can not be suspended in the cooling gas that is discharged from is made dirty.

Fig. 4 represents the second embodiment of the present invention, and in this embodiment, the helical thread portion 35 in fixed installation 34 inboards, hole passes rear case 14 and valve plate 13.In valve plate 13, be shaped on passage 37 and be used to be communicated with corresponding output chamber 28 and fixed installation hole 34.Be screwed into by the helical thread portion 41 with main body 40 and make main body 40 be fixed to this spline structure in the mounting hole 34 in the helical thread portion 35 that runs through rear case 14 and valve plate 13 to make outer surface that the relief valves 38 that are placed in the fixed installation hole 34 do not stretch out rear case 14 therefore, the beneficial effect that is had in first embodiment has in this embodiment equally.

Although this paper has only described two embodiments of the invention, those people that know this technology understand: the present invention can be implemented and not broken away from the spirit and scope of the present invention with other many concrete modes.For example, embodiments of the invention can be made following remodeling:

(a) relief valve 38 can be fixedly mounted in the rear case 14 with its 42 modes that are directly exposed in the output chamber 28 that enter the mouth.In this case, shown in Fig. 2 double dotted line, relief valve 38 preferably places the position of P1 or P2 as far as possible away from output channel 30 ground, the position of relief valve is equivalent to the position between the adjacent cylinder hole 20, whether this structure can avoid relief valve 38 to hinder flowing of cooling gas in the output chambers 28 substantially, be exposed in the output chamber 28 irrelevant with valve 38.

(b) overflow hole 43 in the relief valve 38 can be produced in the spring seat 48.

(c) in the above-described embodiments, relief valve is to be provided in the oblique tray type compressor that adopts double-head piston.But the present invention also can be provided in by changing swashplate angle and change in the positive displacement compressor of discharge capacity, adopts in the oblique tray type compressor of single head pison, perhaps adopts the cam with waved surface to replace in the sort of waveform cam compressor of swash plate.

Therefore, it is indicative rather than restrictive that example that is proposed and embodiment only should regard as, and the present invention should not be limited to the given details of this paper, and it can be retrofited in the scope of the claim of being applied for.

Claims

1. compressor, comprise cylinder body (11) with cylinder hole (20), be rotatably supported in the rotation moving axis (17) in the cylinder body (11), be installed in the drive plate (24) on the rotatingshaft (17), link to each other with drive plate (24) and place piston (21) in the cylinder hole (20), form the housing (14) of output chamber (28) with linking to each other with cylinder body (11), wherein said drive plate (24) converts rotatablely moving of rotatingshaft (17) to-and-fro motion of piston (21) in cylinder hole (20) to, the gas that is input in the cylinder hole (20) with compression also enters output chamber (28) to compressed gas, and described compressor comprises:

Described housing (14) has an outer surface;

A relief valve (38) is used for discharging the pressure of exporting chamber (28) to be made it to remain in the predetermined scope, and described relief valve (38) is installed in the outer surface of housing (14); With

Described relief valve (38) have one with described output chamber (28) inlet that communicate, that accept its pressure (42).

2. according to the described compressor of claim 1, wherein said housing (14) has a predetermined width (H), and the length of wherein said relief valve (38) is less than the width (H) of housing (14).

3. also comprise according to claim 1 or 2 described compressors:

An output channel (30) that is used for discharging the gas of exporting chamber (28), described output channel (30) have an inlet that opens wide towards output chamber (28), wherein are drained into the inlet of the gas flow output channel (30) of output chamber (28) by cylinder hole (20); With

Described relief valve (38) is arranged in the outside of the gas flow in the output chamber (28).

4. be installed in the center of housing (14) substantially according to the wherein said relief valve of the described compressor of claim 3 (38), make around the loop configuration of relief valve (38) described output chamber (28).

5. have one according to the wherein said housing of the described compressor of claim 4 (14) and be used to connect the inlet (42) of relief valve (38) and the passage (37) of output chamber (28).

6. according to the described compressor of claim 3, the inlet of wherein said relief valve (38) is exposed in the output chamber (28), described relief valve (38) be arranged in away from output channel (30) import and on the position of face outside cylinder hole (20).

7. according to the wherein said housing of the described compressor of claim 1 (14) tapped hole (35) is arranged, wherein said relief valve (38) is screwed in the described tapped hole (35).

8. also comprise according to the described compressor of claim 7:

Place the valve plate (13) between described cylinder body (11) and the described housing (14); With

Described tapped hole (35) passes housing (14) and valve plate (13).

9. have one to be used to connect the inlet of relief valve (38) and the connecting passage (37) of output chamber (28) according to the wherein said valve plate of the described compressor of claim 8 (13).

10. according to claim 1 or 2 described compressors, wherein said relief valve (38) has a peripheral wall, and described relief valve (38) has and one is located at overflow hole (43) on this perisporium, is used for discharging the gas in the output chamber (28).

11. also comprise according to the described compressor of claim 10:

Described housing (14) has a mounting hole (34) to be used to install relief valve (38), and described mounting hole (34) has an inner peripheral surface;

Described inner peripheral surface has a groove (36); With

Described overflow hole (43) opens wide to groove (36), therefore, flows to the outside of housing (14) along groove (36) by the gas of overflow hole (43) release.

12. according to the described compressor of claim 11, wherein said groove (36) has to be accepted air-flow and makes the bottom surface of air-flow along groove (36) water conservancy diversion.