CN1525066A

CN1525066A - Hermetic Electric Compressor

Info

Publication number: CN1525066A
Application number: CNA031067948A
Authority: CN
Inventors: 堀口隆文; 彦; 太田年彦; 规; 石田贵规; 正; 井出照正; 秀; 长尾崇秀; 片山诚
Original assignee: Matsushita Refrigeration Co
Current assignee: Panasonic Appliances Refrigeration Devices Singapore Pte Ltd
Priority date: 2003-02-28
Filing date: 2003-02-28
Publication date: 2004-09-01
Anticipated expiration: 2023-02-28
Also published as: CN1291157C

Abstract

The invention is a closed electric compressor, setting a concave oil supply tank on the outer circumference of the piston, and determined in the mode that at the time of bottom dead point, the oil supply tank comes out from the gap on the cylinder wall. Thus, it increases the supply quantity of lubricant between the piston and the cylinder and the leakage reduces at the time of compression, preventing the efficiency from reducing.

Description

Closed-type electrically-driven compressor

Technical field

The present invention relates to a kind of closed-type electrically-driven compressor that is used in the VFC mode that refrigerator and air regulator etc. locate, the high efficiency when relating in particular to low-speed running.

Background technique

In recent years, when using refrigerator and air conditioner etc., strong request reduces the consumption of electric power.Now, the closed-type electrically-driven compressor of VFC formula, the high efficiency when low speed rotation become a problem.

Motor compressor in the past, shown in for example the spy opens on the 2000-145637 communique.Below, the limit describes with reference to the closed-type electrically-driven compressor of accompanying drawing limit to above-mentioned conventional art.Also have, in the following description, relation up and down is a benchmark of closed-type electrically-driven compressor being arranged to normal state.

Fig. 6 is the sectional view of the closed-type electrically-driven compressor of conventional art, and Fig. 7 is the efficiency characteristic figure for the running rotating speed (operating frequency) of in the past closed-type electrically-driven compressor.

Closed container 61 in Fig. 6 is being taken in motor part 65 64 that form by stator 63 and rotor, that be rotated with the VFC mode and the press part 66 that is driven by motor part 65.Lubricant oil 62 is stored in the closed container 61.

Below, the detailed structure of press part 66 is described.Cylinder barrel unit 67 forms cylinder barrel 73.Bent axle 68 is made of main shaft 69 and eccentric shaft 70.Bent axle 68, in the oil pump 78 that is communicated with the upper end of eccentric shaft 70 by the fuel feeding path is housed, and its lower ending opening is in lubricant oil 62.Connecting rod 71 is connected with piston 74 with eccentric shaft 70 by wrist pin 72.Valve plate 75 has inlet hole, sucks valve, tap hole, discharge valve (all not shown).Cylinder cap 76, inside are divided into suction chamber, discharge chamber (all not shown).Attract baffler 77 to be communicated with the suction chamber of cylinder cap 76.Slightly becoming the breach 67a of U font, is the opening of upper wall on cylinder barrel 73 from cylinder barrel unit 67.Breach 67a is to use when the connecting rod 71 that the piston 74 that will insert in advance in the cylinder barrel 73 is connected with eccentric shaft 70 aligns mutually that wrist pin 72 is inserted in location back and both are assembled.

To closed-type electrically-driven compressor, its action is described below with above-mentioned formation.The rotor 64 of motor part 65 makes bent axle 68 rotations.The connecting rod 71 that moves through of eccentric shaft 70 passes to piston 74, and like this, piston 74 moves back and forth in cylinder barrel 73.Thus, import refrigerant gas in the closed containers 61, suck and in cylinder barrel 73, compressed continuously from the opening portion that attracts baffler 77 by suction pipe 82.In addition, follow the rotation of bent axle 68, oil pump 78 attracts lubricant oil, and from inclined path 81, spiral chute 79 guiding tops.Then, lubricant oil is sprayed to breach 67a through intercommunicating pore 80, the lubricant oil bleed hole 70b that is provided with from the upper end of eccentric shaft 70.Lubricant oil after injected like this, when be sprayed on piston 74 above the time just play between piston 74 and cylinder barrel 73 effect of lubricated and oil sealing.

Above-mentioned structure in the past slightly is U font breach 67a and assembles because utilized, and connecting rod 71 need not be cut apart.For this reason, it is good producing in batches on cost degradation.

But, in such structure, because on cylinder barrel 73, be provided with the breach 67a that slightly becomes the U font, so the sealing between piston 74 and the cylinder barrel 73 degenerates.In addition, at the fuel delivery in cylinder barrel 73 with when the lubricant oil bleed hole of eccentric shaft ejects the low-speed running that the amount of lubricant oil reduces, the oil seal between piston 74 and the cylinder barrel 73 becomes extremely bad, and efficient will descend.

Among Fig. 7, horizontal ordinate is represented the running rotating speed of compressor, and ordinate is represented the achievement coefficient COP (W/W) of the running efficiency of compressor.COP has maximum for the running rotating speed, just becomes maximum value in the time of 40-45 revolutions per second.In addition, when the slow-speed of revolution, especially when the slow-speed of revolution below 35 revolutions per seconds, the running efficiency of closed-type electrically-driven compressor significantly reduces.This will consider owing to cause refrigerating capacity to descend and produce the increase of slippage loss because oil pump capacity descends from the leakage of the pressurized gas of cylinder barrel 73.

On the other hand, as other the example in past, breach that the U font is not set is arranged and method that connecting rod is cut apart, assembled on cylinder barrel.In this method, because the sealing between piston and cylinder barrel is guaranteed, so when low-speed running, efficient is difficult for descending.But the assembling performance of this method is bad, because the part number of packages increases, so cost uprises.

Summary of the invention

Closed-type electrically-driven compressor of the present invention, the press part of in closed container, taking in motor part and driving by motor.Press part has: the 1) bent axle that is made of main shaft and eccentric shaft; 2) oil pump that is communicated with eccentric shaft by the fuel feeding path; 3) axle supporting crankshaft main shaft and have the cylinder barrel unit that has cylinder barrel.And drive crankshaft rotating by motor part, attract lubricant oil with this, and the notch part jet lubrication oil that is provided with to the cylinder barrel upper wall from eccentric shaft.The periphery of piston is provided with oil supply, and when piston was positioned at lower dead centre, the oil supply of ring-type came out from notch part.

Description of drawings

Fig. 1 is the sectional view of the closed-type electrically-driven compressor of the embodiment of the invention 1.

Fig. 2 is the sectional view of major component of the closed-type electrically-driven compressor of the embodiment of the invention 1.

Fig. 3 A be among Fig. 2 along V-V ' line to view.

The figure that Fig. 3 B describes the perforation direction of the lubricant oil bleed hole of the closed-type electrically-driven compressor of the embodiment of the invention 1.

Fig. 4 is the running rotating speed of closed-type electrically-driven compressor of the expression embodiment of the invention 1 and the performance plot of efficient.

Fig. 5 is the enlarged view of piston of the closed-type electrically-driven compressor of the embodiment of the invention 2.

Fig. 6 is the face that the connects figure of closed-type electrically-driven compressor in the past.

Fig. 7 represents the running rotating speed of closed-type electrically-driven compressor in the past and the performance plot of efficient.

Embodiment

Below, to the embodiment of closed-type electrically-driven compressor of the present invention, the limit describes with reference to the accompanying drawing limit.In addition, give same symbol, and omit its detailed description the key element that has with spline structure.

(embodiment 1)

Fig. 1 is the sectional view of the closed-type electrically-driven compressor of the embodiment of the invention 1, and Fig. 2 is the sectional view of major component, Fig. 3 A be among Fig. 2 along V-V ' line to view.

Among Fig. 1, closed container 1 is being taken in motor part of being made up of stator 3, rotor 45 and the press part 6a that is driven by motor part 5.

Below, the detailed structure of press part 6a is described in following.Cylinder barrel unit 7 forms cylinder barrel 13, and bent axle 8 is made of main shaft 9 and eccentric shaft 10.Bent axle 8, in the oil pump 18 that is communicated to eccentric shaft 10 upper ends by the fuel feeding path is housed, be provided with simultaneously the opening in lubricant oil 2 in its lower end, in addition, bent axle 8 is connected with rotor.Connecting rod 11 links together eccentric shaft 10 and piston 23 by wrist pin 12.The breach 7a that slightly is the U font is the upper wall in cylinder barrel unit 7, the opening that is provided with on cylinder barrel 13.Breach 7a is will insert the piston 23 in the cylinder barrel 13 in advance and be connected that connecting rod 11 on the eccentric shaft 10 aligns mutually that wrist pin 12 is inserted in the back, location and use when both are fitted together.

As shown in Fig. 2 and Fig. 3 A, eccentric shaft 10 on respect to the notch part that is arranged on the semicircular arc on the cylinder barrel 13 (to call notch part in the following text) 7c position, has lubricant oil bleed hole 10d.In addition, be arranged on the end of intercommunicating pore 20 of the inside of eccentric shaft 10, in the upper end open of eccentric shaft 10, and the other end is communicated with inclined path 21 and oil pump 18 by the swivelling chute 19 that forms on the periphery of main shaft 9.As shown in Figure 3A, piston 23 has oil supply (the to call groove in the following text) 23e of annular and the groove 26e of closed container 1 interior connection on its periphery, and at the lower dead centre of

piston

23,7c comes out from notch part.In addition, when near when compression (upper dead center), groove 23e enters in the cylinder barrel 13.

Valve plate 15 has inlet hole, sucks valve, tap hole and discharge valve (all not shown), and the end face of cylinder barrel 13 is carried out shutoff.Cylinder cap 16, its inside are divided into suction chamber and discharge chamber (all not diagrammatic sketch), for valve plate 15, relative with piston 23 to a side fix.Attract baffler 17, be fixed and be positioned at the below of cylinder barrel unit 7 with the state that is clipped in 16 of valve plate 15 and cylinder caps.Attract an end of baffler 17, is communicated with cylinder barrel by valve plate 15, the other end is communicated with near the opening portions of suction pipe 22 settings on being arranged on closed container 1.Suction pipe 22 is fixed on the closed container 1, is connected to low pressure one side (not shown) of cooling cycle system simultaneously, and refrigerant gas (not shown) is imported in the closed container 1.

Closed-type electrically-driven compressor to constituting as described above describes its action below.The rotor 4 of motor part 5 makes bent axle 8 rotations.The motion of eccentric shaft 10 passes to piston 23 by connecting rod 11, and with this, piston 23 moves back and forth in cylinder barrel 13.Feed ingress pipe 22 thus and be directed to refrigerant gas in the closed container 1, be inhaled into, in cylinder barrel 13, be compressed continuously from the opening portion that attracts baffler 17.In addition, when bent axle 8 is rotated by motor part 5,, the rotation of oil pump 18 rises because of making lubricant oil 2.Then, rely on the effect of the pump of inclined path 21,, lubricant oil is directed at eccentric shaft 10 by spiral chute 19 and intercommunicating pore 20.Be directed at the lubricant oil in the eccentric shaft 10, because action of centrifugal force, the lubricant oil bleed hole 10d that is provided with in the eccentric shaft ejects.The lubricant oil that ejects from lubricant oil bleed hole 10d, with after the sidewall of notch part 7c on the upper wall that is arranged on cylinder barrel 13 contacts, fall and flow to piston 23 above, to being lubricated between piston 23 and the cylinder barrel 13.

In the present embodiment, on the periphery of piston 23 groove 23e is arranged.And piston 23 is when lower dead centre, and groove 23e comes out from the notch part 7c that cylinder barrel 13 is provided with.When compression, groove 23e carries out in the cylinder barrel 13.Owing to have such structure, thus the lubricant oil that ejects from the lubricant oil bleed hole 10b of eccentric shaft 10, with after notch part 7c contacts, always led piston 23 above.And at piston 23 at lower dead centre, lubricant oil is just stayed in the groove 23e that is provided with on the outer surface of piston 23.When compression, because groove 23e carries out among the notch part 7c, the sealing between piston 23 and the cylinder barrel 13 is improved, and the pressurized gas in the cylinder barrel 13 is prevented from being leaked to low pressure one side in the seal container 1.

In addition, shown in Fig. 2, Fig. 3 A, the lubricant oil bleed hole 10d of eccentric shaft 10 is arranged on the position relative with notch part 7c, and identical height is desirable.Do like this, from the lubricant oil that the oily bleed hole 10b of eccentric shaft 10 ejects, always the wall surface with notch part 72 contacts, and fall flow to piston 23 above.Thus, lubricant oil is trapped among the groove 23e, and the fuel delivery between piston 23 and the cylinder barrel 13 increases.And, in lubricant oil bleed hole 10d, be preferably with the angle rightabout 5 °-10 ° with sense of rotation.Promptly shown in Fig. 3 B like that, the penetration direction of described lubricant oil bleed hole with the rotating center and the line that the central authorities of notch part are connected of above-mentioned eccentric shaft, has and the rightabout angle below 10 ° more than 5 ° of sense of rotation.When not being with angle, eject lubricant oil from the lubricant oil bleed hole 10b of eccentric shaft 10, contact at the wall of piston upper dead center with notch part 7c.But with such structure, when piston 23 during at lower dead centre, lubricant oil is sprayed onto on the wall surface of notch part 7c, and fuel delivery further obtains increasing.

Fig. 4 is the running rotating speed and the efficiency characteristic figure of closed-type electrically-driven compressor in the embodiments of the invention 1.In Fig. 4, horizontal ordinate is represented the running rotating speed of closed-type electrically-driven compressor, and ordinate is that the running efficiency of closed-type electrically-driven compressor is represented with achievement coefficient COP (W/W).Dotted line, expression closed-type electrically-driven compressor in the past, solid line is represented the characteristic of the closed-type electrically-driven compressor of present embodiment.Both COP have maximum simultaneously for the running rotating speed, but on whole running rotating speed, the achievement coefficient of compressor of the present invention is better.Especially when the rotation number than 35 revolutions per seconds low, it is big that both characteristic differences become, and the characteristic of present embodiment is better when the slow-speed of revolution as can be known.

By the VFC of compressor, when being lower than the slow-speed of revolution below 35 revolutions per seconds and turning round, the supply capability of oil pump descends, and the amount of the lubricant oil that ejects from the lubricant oil bleed hole 10d of eccentric shaft 10 also reduces.Therefore, the oil seal between piston and the cylinder barrel can worsen.In addition, the leakage rate of elongated owing to the cycle time of reciprocating motion of the pistons, as to compress the time lengthening of wanting, cylinder barrel pressurized gas also just increases, and is caused the decline of compressor efficiency by the decline of refrigerating capacity.But, as present embodiment, accomplish reliably toward the notch part fuel feeding, and be provided with oil supply in the piston periphery, even thereby when low speed, the fuel delivery between piston and cylinder barrel also can obtain increasing.Therefore, the running efficiency of compressor is improved.

In addition, in the present embodiment, 23e is defined as ring-type with groove.But, as lubricant oil can being supplied with between piston 23 and the cylinder barrel 13, even then groove 23e does not form the whole week and is fine yet on piston.In addition, also can be piston 23 when lower dead centre, with one one of groove 23e with the shape exposed from notch part 7c, along the shape of the periphery of piston 23.

In addition, the shape of notch part 7c is formed the semicircle arcuation.Yet,, also can form triangle or square etc. polygon shape as long as lubricant oil can be supplied with between piston 23 and the cylinder barrel 13.

In addition, in the present embodiment, oil pump 18 is arranged on main shaft 9 inside of bent axle 8.Motor compressor becomes compact thus, even oil pump is arranged on the main shaft outside, also is purpose of the present invention, even can provide low-speed running also to have high efficiency motor compressor.

In addition, in the present embodiment, formed lubricant oil bleed hole 10d on the top of eccentric shaft 10.But if there is not hole 10d, as shown in Figure 2, because the upper end of lubricant oil 2 from connecting tube 20 emitted, so lubricant oil 2 can be supplied with between cylinder barrel 13 and the piston 23.

(embodiment 2)

Fig. 5 is the enlarged view of piston of the closed-type electrically-driven compressor of embodiments of the invention 2.On near the periphery the piston 23a end face, many oil supply (following title groove) 23e is arranged, and to set when the piston 23a mode that many groove 23e stretch out during at lower dead centre.Therefore, the lubricant oil from eccentric shaft 10 ejects behind the wall of the notch part 72 of running into the semicircle arcuation, is trapped among many groove 23e at lower dead centre.Thus, the fuel delivery of past piston 23a and cylinder barrel 13 can increase, and more can improve the sealing of cylinder barrel 13.

Claims

1. A hermetic electric compressor, characterized in that it has:

Comprising: a crankshaft having a main shaft and an eccentric shaft, an oil pump communicating with the eccentric shaft through an oil supply passage, a cylinder unit supporting the main shaft in a freely rotatable manner and having a cylinder, reciprocating in the cylinder the piston, the compression part of the connecting rod that transmits the rotational movement of the eccentric shaft to the piston, and

a motor portion that drives the compression portion, and

a closed container for receiving the compression part, the motor part and lubricating oil;

The upper wall of the cylinder has a notch,

When the piston is at the bottom dead center of the piston, the oil supply groove communicating with the closed container is located on the outer periphery of the piston through the notch.

2. The hermetic electric compressor according to claim 1, characterized in that:

It also has a lubricating oil discharge hole formed on the upper part of the eccentric shaft.

3. The hermetic electric compressor according to claim 2, characterized in that:

The lubrication release hole is provided at a position higher than the notch.

4. The hermetic electric compressor according to claim 2, characterized in that:

The penetrating direction of the lubricating oil discharge hole forms an angle of not less than 5° and not more than 10° in a direction opposite to the direction of rotation to a connecting line connecting the center of rotation of the eccentric shaft and the center of the notch.

5. The hermetic electric compressor according to claim 1, characterized in that:

The notch is in the shape of a semicircle.

6. The hermetic electric compressor according to claim 1, characterized in that:

The oil supply groove is annular.

7. The hermetic electric compressor according to claim 1, characterized in that:

The oil pump is built into the crankshaft.

8. The hermetic electric compressor according to claim 1, characterized in that:

The piston has multiple oil supply grooves.

9. The hermetic electric compressor according to claim 1, characterized in that:

The rotational speed of 35 revolutions/second or less is included in the operating rotational speed.