阅读说明：本技术 旋转式压缩机 (Rotary compressor ) 是由 上田健史 泉泰幸 于 2018-04-17 设计创作，主要内容包括：旋转式压缩机(1)的压缩部(12)具有：中间隔板(140),其配置于上气缸(121T)与下气缸(121S)之间；上叶片(127T),其将形成于上气缸(121T)内的上气缸室(130T)划分为上吸入室(131T)与上压缩室(133T)；以及下叶片(127S),其将形成于下气缸(121S)内的下气缸室(130S)划分为下吸入室(131S)与下压缩室(133S)。中间隔板(140)形成有：注入孔(140b),其用于对上压缩室(133T)及下压缩室(133S)喷射液态制冷剂；以及注入通路(140a),其用于对注入孔(140b)供给液态制冷剂。注入通路(140a)沿着不与供旋转轴(15)插入的旋转轴插入孔(213)相交的直线(141)形成。(A compression unit (12) of a rotary compressor (1) comprises: an intermediate partition (140) disposed between the upper cylinder (121T) and the lower cylinder (121S); an upper vane (127T) that divides an upper cylinder chamber (130T) formed in the upper cylinder (121T) into an upper suction chamber (131T) and an upper compression chamber (133T); and a lower vane (127S) that divides a lower cylinder chamber (130S) formed in the lower cylinder (121S) into a lower suction chamber (131S) and a lower compression chamber (133S). The intermediate partition (140) is formed with: an injection hole (140b) for injecting a liquid refrigerant into the upper compression chamber (133T) and the lower compression chamber (133S); and an injection passage (140a) for supplying a liquid refrigerant to the injection hole (140 b). The injection passage (140a) is formed along a straight line (141) that does not intersect a rotary shaft insertion hole (213) into which the rotary shaft (15) is inserted.)

1. A rotary compressor having:

a compressor housing having a sealed vertically disposed cylindrical shape, a discharge pipe for discharging a refrigerant being provided at an upper portion thereof, and an upper suction pipe and a lower suction pipe for sucking a refrigerant being provided at a lower portion of a side surface thereof;

a liquid reservoir fixed to a side portion of the compressor housing and connected to the upper suction pipe and the lower suction pipe;

a motor disposed in the compressor housing; and

a compression unit that is disposed below the motor in the compressor housing, is driven by the motor, sucks the refrigerant from the accumulator through the upper suction pipe and the lower suction pipe, compresses the refrigerant, and discharges the refrigerant from the discharge pipe;

the compression section has:

an annular upper cylinder and a lower cylinder;

an upper end plate closing an upper side of the upper cylinder; and a lower end plate closing a lower side of the lower cylinder;

an intermediate partition plate disposed between the upper cylinder and the lower cylinder and closing a lower side of the upper cylinder and an upper side of the lower cylinder;

a rotating shaft supported by a main bearing portion provided in the upper end plate and a sub-bearing portion provided in the lower end plate and rotated by the motor;

an upper eccentric portion and a lower eccentric portion provided to the rotary shaft, and having a phase difference of 180 ° therebetween;

an upper piston fitted to the upper eccentric portion, revolving along an inner circumferential surface of the upper cylinder, and forming an upper cylinder chamber in the upper cylinder;

a lower piston fitted in the lower eccentric portion, revolving along an inner circumferential surface of the lower cylinder, and forming a lower cylinder chamber in the lower cylinder;

an upper vane protruding into the upper cylinder chamber from an upper vane groove provided in the upper cylinder, abutting against the upper piston, and dividing the upper cylinder chamber into an upper suction chamber and an upper compression chamber; and

a lower vane protruding into the lower cylinder chamber from a lower vane groove provided in the lower cylinder, abutting against the lower piston, and dividing the lower cylinder chamber into a lower suction chamber and a lower compression chamber;

the rotary compressor is characterized in that:

the intermediate partition is formed with:

an injection hole for injecting a liquid refrigerant into the upper compression chamber and the lower compression chamber; and

an injection passage for supplying the liquid refrigerant to the injection hole;

the injection passage is formed along a straight line not intersecting with a rotary shaft insertion hole of the intermediate partition into which the rotary shaft is inserted.

2. The rotary compressor of claim 1, wherein:

the upper blade and the lower blade are arranged along a plane coinciding with a rotation center line of the rotation shaft;

a center angle formed by a perpendicular line drawn from the injection port to the rotation center line and a straight line perpendicular to the rotation center line among straight lines parallel to the plane, from an injection port for injecting the liquid refrigerant into the upper compression chamber and the lower compression chamber through the injection hole, is 40 ° or less.

3. The rotary compressor of claim 1, wherein:

the compression section further has:

an upper end plate cover covering the upper end plate, forming an upper end plate cover chamber between the upper end plate cover and the upper end plate, and having an upper end plate cover discharge hole communicating the upper end plate cover chamber with the interior of the compressor housing; and

a lower end plate cover covering the lower end plate and forming a lower end plate cover chamber between the lower end plate and the lower end plate;

the upper end plate is provided with an upper discharge hole which enables the upper compression chamber to be communicated with the upper end plate cover chamber;

the lower end plate is provided with a lower discharge hole which enables the lower compression chamber to be communicated with the lower end plate cover chamber;

a refrigerant passage formed by a plurality of refrigerant passage holes that respectively pass through the lower end plate, the lower cylinder, the intermediate partition plate, the upper end plate, and the upper cylinder, and that communicates the lower end plate cover chamber with the upper end plate cover chamber;

the injection hole is disposed between the rotary shaft insertion hole and a refrigerant passage hole that penetrates the intermediate separator among the plurality of refrigerant passage holes.

4. The rotary compressor of claim 1, wherein:

the middle partition plate is provided with a plurality of bolt holes;

the compression part further includes a plurality of bolts inserted into the plurality of bolt holes, respectively, to fix the lower end plate, the lower cylinder, the intermediate partition plate, the upper end plate, and the upper cylinder;

the injection hole is disposed between the rotary shaft insertion hole and 1 of the plurality of bolt holes.

5. The rotary compressor of claim 4, wherein:

the injection passage is disposed between the 1 bolt hole and another bolt hole, which is a different bolt hole from the 1 bolt hole, of the plurality of bolt holes;

the other bolt holes are disposed on the upper compression chamber and the lower compression chamber side than the upper vane and the lower vane.

6. The rotary compressor of claim 1, wherein:

the intermediate partition plate is also provided with other injection passages connected with the injection passages;

the compression unit further includes an injection pipe inserted into the other injection passage and supplied with the liquid refrigerant from outside the compressor housing;

the other injection passage is formed along another straight line intersecting the rotary shaft insertion hole.

7. The rotary compressor of claim 6, wherein:

the compression portion further includes a seal member that seals an open end of the injection passage, which is connected to the outer peripheral surface of the intermediate partition plate.

Technical Field

The present invention relates to a rotary compressor.

Background

Rotary compressors are known which: the compression efficiency of the refrigerant is improved by injecting the liquid refrigerant into the cylinder chamber for compressing the refrigerant (see patent document 1). The compression section of a double-cylinder rotary compressor comprises: an upper end plate for closing the upper side of the upper cylinder chamber; a lower end plate closing a lower side of the lower cylinder chamber; and an intermediate partition plate that partitions the upper cylinder chamber from the lower cylinder chamber. The upper end plate is provided with an upper discharge hole for communicating the upper compression chamber in the upper cylinder chamber with the upper end plate cover chamber, and a reed valve type upper discharge valve for opening and closing the upper discharge hole. The lower end plate is provided with a lower discharge hole for communicating the lower compression chamber in the lower cylinder chamber with the lower end plate housing chamber, and a reed valve type lower discharge valve for opening and closing the lower discharge hole. The intermediate partition plate is provided with an injection hole and an injection passage for supplying a liquid refrigerant to the injection hole. The rotary compressor can improve efficiency by injecting liquid refrigerant into the lower compression chamber and the lower compression chamber through the injection hole at a predetermined time.

Patent document 1: japanese patent laid-open publication No. 2003-343467

Disclosure of Invention

In the rotary compressor, the intermediate partition plate is formed so that the injection hole is disposed in the vicinity of the upper discharge hole and the lower discharge hole when the compression part is assembled, whereby the liquid refrigerant can be accurately injected into the lower compression chamber and the lower compression chamber, and the efficiency can be improved. The intermediate partition plate is further formed with bolt holes for fixing a plurality of members constituting the compression portion to each other, and through holes such as a refrigerant passage through which refrigerant passes, and these through holes are arranged in the vicinity of the upper discharge hole and the lower discharge hole when the compression portion is assembled. In this case, the injection passage needs to be disposed so as to avoid these through holes, and therefore, there is a problem that the injection hole is difficult to be disposed in the vicinity of the upper discharge hole and the lower discharge hole.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a rotary compressor in which an injection hole is disposed in the vicinity of an upper discharge hole and a lower discharge hole.

One aspect of the rotary compressor disclosed in the present application includes: the compressor includes a vertically arranged cylindrical compressor housing, a reservoir, a motor, and a compressor. The compressor casing is sealed, and has a discharge pipe for discharging the refrigerant at the upper part and upper and lower suction pipes for sucking the refrigerant at the lower part of the side surface. The reservoir is fixed to a side portion of the compressor housing and connected to the upper suction pipe and the lower suction pipe. The motor is disposed in the compressor housing. The compression unit is disposed below the motor in the compressor housing, is driven by the motor, sucks the refrigerant from the accumulator through the upper suction pipe and the lower suction pipe, compresses the refrigerant, and discharges the refrigerant from the discharge pipe. The compression part comprises: the device comprises an annular upper cylinder, an annular lower cylinder, an upper end plate, a lower end plate, a middle partition plate, a rotating shaft, an upper eccentric part, a lower eccentric part, an upper piston, a lower piston, an upper blade and a lower blade. The upper end plate closes the upper side of the upper cylinder. The lower end plate closes the lower side of the lower cylinder. The intermediate partition plate is disposed between the upper cylinder and the lower cylinder, and seals a lower side of the upper cylinder and an upper side of the lower cylinder. The rotating shaft is supported by a main bearing portion provided in the upper end plate and a sub-bearing portion provided in the lower end plate, and is rotated by the motor. The upper eccentric part and the lower eccentric part are arranged on the rotating shaft and have a phase difference of 180 degrees. The upper piston forms an upper cylinder chamber in the upper cylinder, is fitted to the upper eccentric portion, and revolves along the inner circumferential surface of the upper cylinder. The lower piston forms a lower cylinder chamber in the lower cylinder, is fitted into the lower eccentric portion, and revolves along the inner circumferential surface of the lower cylinder. The upper vane projects into the upper cylinder chamber from an upper vane groove provided in the upper cylinder, and abuts against the upper piston to divide the upper cylinder chamber into an upper suction chamber and an upper compression chamber. The lower vane protrudes into the lower cylinder chamber from a lower vane groove provided in the lower cylinder, abuts against the lower piston, and divides the lower cylinder chamber into a lower suction chamber and a lower compression chamber. The intermediate partition plate is provided with: an injection hole for injecting a liquid refrigerant into the upper compression chamber and the lower compression chamber; and an injection passage for supplying the liquid refrigerant to the injection hole. The injection passage is formed along a straight line not intersecting with the rotary shaft insertion hole of the intermediate partition plate into which the rotary shaft is inserted.

According to an aspect of the rotary compressor disclosed in the present application, the injection hole can be disposed in the vicinity of the upper discharge hole and the lower discharge hole.

Drawings

Fig. 1 is a longitudinal sectional view showing a rotary compressor according to embodiment 1.

Fig. 2 is an exploded perspective view illustrating a compression part of the rotary compressor according to embodiment 1.

Fig. 3 is a cross-sectional view of a compression part of the rotary compressor of embodiment 1 as viewed from below.

Fig. 4 is a bottom view showing an intermediate partition plate of the rotary compressor of embodiment 1.

Fig. 5 is a bottom view showing a lower end plate of the rotary compressor of embodiment 1.

Fig. 6 is a bottom view showing an intermediate partition plate of a rotary compressor according to a comparative example.

Fig. 7 is a bottom view showing a middle partition plate of the rotary compressor of embodiment 2.

Detailed Description

Hereinafter, embodiments of the rotary compressor disclosed in the present application will be described in detail with reference to the accompanying drawings. The rotary compressor disclosed in the present application is not limited to the following embodiments.