JP2022055042A - Rotary compressor - Google Patents

Abstract

To inhibit a refrigerant suctioned into one cylinder from flowing back to the other cylinder to improve efficiency of a rotary compressor.SOLUTION: A rotary compressor includes: a compressor housing provided with a discharge pipe and a suction pipe of a refrigerant; a compression part which is disposed in the compressor housing and compresses the refrigerant suctioned from the suction pipe to discharge the refrigerant from the discharge pipe; and a motor which is disposed in the compressor housing and drives the compression part. An intermediate partition plate of the compression part has a connection hole with which the suction pipe is connected. The connection hole has: a suction passage extending from the suction pipe; an upper suction hole which is branched from the suction passage and penetrates to the upper cylinder side; and a lower suction hole which is branched from the suction passage and penetrates to the lower cylinder side. The upper suction hole is provided with a reed valve type upper suction valve which opens or closes the upper suction hole with its tip. The lower suction hole is provided with a reed valve type lower suction valve which opens or closes the lower suction hole with its tip.SELECTED DRAWING: Figure 5

Description

The present invention relates to a rotary compressor.

A so-called two-cylinder type rotary compressor having an upper cylinder and a lower cylinder for compressing a refrigerant is known. In the compression section of this type of two-cylinder rotary compressor, the upper cylinder and the lower cylinder are driven with a phase difference around the rotation axis, and the step of sucking the refrigerant into one cylinder and the other cylinder compressing the refrigerant. It is performed at the same time as the process, and two cylinders alternately perform suction and compression. As a two-cylinder type rotary compressor, for example, an upper suction pipe connected to the upper cylinder and a lower suction pipe connected to the lower cylinder are connected, and a refrigerant is used by using the upper suction pipe and the lower suction pipe. (Hereinafter referred to as a two-suction type rotary compressor).

As a two-cylinder rotary compressor of related technology, instead of using two suction pipes, one suction pipe provided on the intermediate partition plate that separates the upper cylinder and the lower cylinder is divided into two upper cylinders and a lower cylinder, respectively. A structure that sends a refrigerant (hereinafter referred to as a one-suction type rotary compressor) is known. The intermediate partition plate is provided with a connection hole to which the suction pipe is connected, and the connection hole is branched into an upper suction hole connected to the upper cylinder and a lower suction hole connected to the lower cylinder. In this rotary compressor, two suction pipes connected to the upper cylinder and the lower cylinder are omitted, and one suction pipe is provided on the intermediate partition plate so that the upper cylinder and the lower cylinder can be formed in the axial direction of the rotating shaft. Since it becomes smaller, leakage of the refrigerant compressed in the upper cylinder and the lower cylinder is reduced, and the compression efficiency is improved.

Japanese Patent No. 507007

In the two-cylinder rotary compressor, the refrigerant is continuously sucked into the upper cylinder and the lower cylinder while the rotating shaft makes one rotation, but the suction force generated during one rotation of the rotating shaft fluctuates. Therefore, of the upper cylinder and the lower cylinder driven with a phase difference around the rotation axis, when the suction force of one cylinder is small, the suction force of the other cylinder is large, so that the suction force is sucked into one cylinder. The refrigerant tends to flow back so that some of the refrigerant is sucked into the other cylinder. Due to the backflow of the refrigerant, there is a problem that the circulating flow rate of the refrigerant in the entire rotary compressor is lowered and the efficiency of the rotary compressor is lowered.

In the 2-suction type rotary compressor, the upper suction pipe connected to the upper cylinder and the lower suction pipe connected to the lower cylinder are provided independently, so that the path connecting the upper cylinder and the lower cylinder is separated. Therefore, the loss due to the backflow of the above-mentioned refrigerant is small. However, in the one-suction type rotary compressor, the upper cylinder and the lower cylinder are connected via the upper suction hole and the lower suction hole provided in the intermediate partition plate, so that one of the refrigerants sucked into one cylinder. The refrigerant tends to flow back so that the portion is sucked into the other cylinder through the upper suction hole and the lower suction hole, and the loss due to the backflow is large.

The disclosed technique has been made in view of the above, and is capable of suppressing the backflow of the refrigerant sucked into one cylinder toward the other cylinder and increasing the efficiency of the rotary compressor. The purpose is to provide an opportunity.

One aspect of the rotary compressor disclosed in the present application is a compressor housing provided with a refrigerant discharge pipe and a suction pipe, and a compressor disposed inside the compressor housing to compress and discharge the refrigerant sucked from the suction pipe. It includes a compression unit that discharges from a pipe and a motor that is arranged inside the compressor housing to drive the compression unit. The compression unit includes an annular upper cylinder, an annular lower cylinder, and an upper end that closes the upper side of the upper cylinder. It is supported by the lower end plate that closes the lower side of the plate and the lower cylinder, the intermediate partition plate that is placed between the upper cylinder and the lower cylinder and closes the lower side of the upper cylinder and the upper side of the lower cylinder, and the upper end plate and the lower end plate. The rotating shaft rotated by the motor, the upper eccentric part and the lower eccentric part provided on the rotating shaft with a phase difference from each other, and the upper eccentric part are fitted and rotate along the inner peripheral surface of the upper cylinder to be inside the upper cylinder. The upper piston that forms the upper cylinder chamber, the lower piston that is fitted into the lower eccentric part and rotates along the inner peripheral surface of the lower cylinder to form the lower cylinder chamber in the lower cylinder, and the upper vane provided on the upper cylinder. The upper vane that protrudes from the groove into the upper cylinder chamber and contacts the upper piston to divide the upper cylinder chamber into the upper suction chamber and the upper compression chamber, and the lower vane groove provided in the lower cylinder protrudes into the lower cylinder chamber and contacts the lower piston. In a rotary compressor having a lower vane that partitions the lower cylinder chamber into a lower suction chamber and a lower compression chamber, the intermediate partition plate has a connection hole to which the suction pipe is connected, and the connection hole extends from the suction pipe. It has a suction path, an upper suction hole that branches from the suction path and penetrates to the upper cylinder side, and a lower suction hole that branches from the suction path and penetrates to the lower cylinder side. Is provided with a lead valve type upper suction valve that opens and closes the upper suction hole, and the lower suction hole is provided with a lead valve type lower suction valve whose tip opens and closes the lower suction hole.

According to one aspect of the rotary compressor disclosed in the present application, it is possible to suppress the refrigerant sucked into one cylinder from flowing back toward the other cylinder, and to improve the efficiency of the rotary compressor.

FIG. 1 is a vertical sectional view showing a rotary compressor of an embodiment. FIG. 2 is an exploded perspective view showing a compressed portion of the rotary compressor of the embodiment. FIG. 3 is a plan view showing a main part of the rotary compressor of the embodiment. FIG. 4 is a plan view showing an intermediate partition plate of the rotary compressor of the embodiment. FIG. 5 is a vertical sectional view showing a main part of the rotary compressor of the embodiment. FIG. 6 is a perspective view showing the upper cylinder of the rotary compressor of the embodiment from above. FIG. 7 is a perspective view showing the upper cylinder of the rotary compressor of the embodiment from below. FIG. 8 is a vertical cross-sectional view showing the upper suction port and the lower suction port in the embodiment from the inside of the upper cylinder chamber and the lower cylinder chamber.

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

(Composition of rotary compressor)
FIG. 1 is a vertical sectional view showing a rotary compressor of an embodiment. FIG. 2 is an exploded perspective view showing a compressed portion of the rotary compressor of the embodiment.

As shown in FIG. 1, the rotary compressor 1 is arranged in a compression unit 12 arranged at the lower part in a sealed vertical cylindrical compressor housing 10 and at an upper part in the compressor housing 10. It includes a motor 11 that drives the compression unit 12 via a rotating shaft 15, and a vertically placed cylindrical accumulator 25 that is fixed to the outer peripheral surface of the compressor housing 10.

The accumulator 25 is connected to the connection hole 134 of the intermediate partition plate 140 described later of the compression unit 12 via the suction pipe 105 and the accumulator curved pipe 31. The rotary compressor 1 of this embodiment is a one-suction type rotary compressor that sends a refrigerant from one suction pipe 105 to the upper cylinder 121T and the lower cylinder 121S of the compression unit 12, respectively.

The motor 11 includes a stator 111 arranged on the outside and a rotor 112 arranged on the inside. The stator 111 is fixed to the inner peripheral surface of the compressor housing 10 in a shrink-fitted state, and the rotor 112 is fixed to the rotating shaft 15 in a shrink-fitted state.

In the rotary shaft 15, the lower sub-shaft portion 151 of the lower eccentric portion 152S is rotatably supported by the sub-bearing portion 161S provided on the lower end plate 160S, and the upper spindle portion 153 of the upper eccentric portion 152T is the upper end plate. The upper piston 125T and the lower piston 125S are rotatably supported by the main bearing portion 161T provided in the 160T, and the upper piston 125T and the lower piston 125S are supported by the upper eccentric portion 152T and the lower eccentric portion 152S provided with a phase difference of 180 degrees from each other. As a result, the upper piston 125T and the lower piston 125S are rotatably supported by the compression portion 12, and the upper piston 125T and the lower piston 125S revolve along the inner peripheral surface 137T of the upper cylinder 121T and the inner peripheral surface 137S of the lower cylinder 121S, respectively. Exercise.

Inside the compressor housing 10, the lubricity of the sliding portions such as the upper piston 125T and the lower piston 125S sliding in the compression portion 12 is ensured, and the upper compression chamber 133T (see FIG. 2) and the lower compression chamber 133S are secured. In order to seal (see FIG. 2), the lubricating oil 18 is sealed in an amount that substantially immerses the compression portion 12. A mounting leg 310 (see FIG. 1) for locking a plurality of elastic support members (not shown) that support the entire rotary compressor 1 is fixed to the lower side of the compressor housing 10.

As shown in FIG. 1, the compressor housing 10 is provided with a discharge pipe 107 for discharging the refrigerant at the upper portion, and a suction pipe 105 for sucking the refrigerant is provided at the side surface portion. The compression unit 12 compresses the refrigerant sucked from the suction pipe 105 and discharges it from the discharge pipe 107. As shown in FIG. 2, in order from the top, the compression portion 12 has an upper end plate cover 170T, an upper end plate 160T, an annular upper cylinder 121T, an intermediate partition plate 140, and an annular portion having a bulging portion having a hollow space formed inside. The lower cylinder 121S, the lower end plate 160S, and the flat plate-shaped lower end plate cover 170S are laminated. The entire compression unit 12 is fixed by a plurality of through bolts 174, 175 and auxiliary bolts 176 arranged on substantially concentric circles from above and below.

As shown in FIG. 2, a cylindrical inner peripheral surface 137T is formed on the upper cylinder 121T. Inside the inner peripheral surface 137T of the upper cylinder 121T, an upper piston 125T having an outer diameter smaller than the inner diameter of the inner peripheral surface 137 of the upper cylinder 121T is arranged, and the inner peripheral surface 137T and the outer peripheral surface 139T of the upper piston 125T are arranged. An upper compression chamber 133T that sucks in the refrigerant, compresses it, and discharges it is formed between the two. A cylindrical inner peripheral surface 137S is formed on the lower cylinder 121S. Inside the inner peripheral surface 137S of the lower cylinder 121S, a lower piston 125S having an outer diameter smaller than the inner diameter of the inner peripheral surface 137S of the lower cylinder 121S is arranged, and the inner peripheral surface 137S and the outer peripheral surface 139S of the lower piston 125S are arranged. A lower compression chamber 133S that sucks in the refrigerant, compresses it, and discharges it is formed between the two.

The upper cylinder 121T has an upper protruding portion 122T protruding in the radial direction of the cylindrical inner peripheral surface 137T from the outer peripheral portion of the circular shape. The upper protrusion 122T is provided with an upper vane groove 128T extending outward radially from the upper cylinder chamber 130T. The upper vane 127T is slidably arranged in the upper vane groove 128T. The lower cylinder 121S has a downward protruding portion 122S protruding in the radial direction of the cylindrical inner peripheral surface 137S from the outer peripheral portion of the circular shape. The lower protruding portion 122S is provided with a lower vane groove 128S extending outward radially from the lower cylinder chamber 130S. The lower vane 127S is slidably arranged in the lower vane groove 128S.

The upper cylinder 121T is provided with an upper spring hole 124T at a position overlapping the upper vane groove 128T from the outer surface at a depth that does not penetrate the upper cylinder chamber 130T. An upper spring 126T is arranged in the upper spring hole 124T. The lower cylinder 121S is provided with a lower spring hole 124S at a position overlapping the lower vane groove 128S from the outer surface at a depth that does not penetrate the lower cylinder chamber 130S. A lower spring 126S is arranged in the lower spring hole 124S.

Further, in the lower cylinder 121S, the compressed refrigerant in the compressor housing 10 is introduced by communicating the radial outside of the lower vane groove 128S and the inside of the compressor housing 10 at the opening, and the lower vane 127S is introduced. A lower pressure introduction path 129S is formed in which a back pressure is applied by the pressure of the refrigerant. The compressed refrigerant in the compressor housing 10 is also introduced from the lower spring hole 124S. Further, in the upper cylinder 121T, the compressed refrigerant in the compressor housing 10 is introduced by communicating the radial outside of the upper vane groove 128T and the inside of the compressor housing 10 at the opening, and the upper vane 127T. An upper pressure introduction path 129T is formed in which a back pressure is applied by the pressure of the refrigerant. The compressed refrigerant in the compressor housing 10 is also introduced from the upper spring hole 124T.

The upper cylinder chamber 130T is closed at the upper and lower ends by an upper end plate 160T and an intermediate partition plate 140, respectively. The upper and lower parts of the lower cylinder chamber 130S are closed by an intermediate partition plate 140 and a lower end plate 160S, respectively. The intermediate partition plate 140 has a lateral protrusion 141 protruding radially from the outer peripheral portion of the circular shape. The lateral protrusion 141 of the intermediate partition plate 140 is provided with a connection hole 134 into which the suction pipe 105 is fitted. As shown in FIG. 1, the connection hole 134 has an upper suction hole 135T connected to the upper cylinder chamber 130T and a lower suction hole 135S connected to the lower cylinder chamber 130S. The details of the connection hole 134, the upper suction valve 143T for opening and closing the upper suction hole 135T, and the lower suction valve 143S for opening and closing the lower suction hole 135S will be described later.

The upper cylinder chamber 130T is provided in the upper suction chamber 131T communicating with the upper suction hole 135T and the upper end plate 160T by the upper vane 127T being pressed by the upper spring 126T and abutting on the outer peripheral surface 139T of the upper piston 125T. It is partitioned into an upper compression chamber 133T communicating with the upper discharge hole 190T (see FIG. 3). The lower cylinder chamber 130S is provided in the lower suction chamber 131S communicating with the lower suction hole 135S and the lower end plate 160S by the lower vane 127S being pressed by the lower spring 126S and abutting on the outer peripheral surface 139S of the lower piston 125S. It is partitioned into a lower compression chamber 133S communicating with the lower discharge hole 190S (see FIG. 3).

As shown in FIG. 2, the upper end plate 160T is provided with an upper discharge hole 190T that penetrates the upper end plate 160T and communicates with the upper compression chamber 133T of the upper cylinder 121T, and an upper discharge hole 190T is provided on the outlet side of the upper discharge hole 190T. An upper valve seat (not shown) is formed around the discharge hole 190T. The upper end plate 160T is formed with an upper discharge valve accommodating recess 164T extending in a groove shape in the circumferential direction of the upper end plate 160T from the position of the upper discharge hole 190T.

In the upper discharge valve accommodating recess 164T, a lead valve type upper discharge valve 200T whose base end portion is fixed in the upper discharge valve accommodating recess 164T by an upper rivet 202T and whose tip portion opens and closes the upper discharge hole 190T, and a proximal end portion. Is overlapped with the upper discharge valve 200T and fixed in the upper discharge valve accommodating recess 164T by the upper rivet 202T, and the tip portion is curved (warped) to regulate the opening degree of the upper discharge valve 200T. Is housed.

The lower end plate 160S is provided with a lower discharge hole 190S that penetrates the lower end plate 160S and communicates with the lower compression chamber 133S of the lower cylinder 121S. The lower end plate 160S is formed with a lower discharge valve accommodating recess (not shown) extending in a groove shape in the circumferential direction of the lower end plate 160S from the position of the lower discharge hole 190S.

In the lower discharge valve accommodating recess, the base end portion is fixed in the lower discharge valve accommodating recess by the lower rivet 202S, and the tip portion opens and closes the lower discharge hole 190S. The entire lower discharge valve retainer 201S, which is overlapped with the discharge valve 200S and is fixed in the lower discharge valve accommodating recess by the lower rivet 202S and the tip portion is curved (warped) to regulate the opening degree of the lower discharge valve 200S, is accommodated. ing.

An upper end plate cover chamber 180T is formed between the upper end plate 160T which is closely fixed to each other and the upper end plate cover 170T having a bulging portion. A lower end plate cover chamber 180S (see FIG. 1) is formed between the lower end plate 160S fixed in close contact with each other and the flat end plate cover 170S. A refrigerant passage hole 136 is provided that penetrates the lower end plate 160S, the lower cylinder 121S, the intermediate partition plate 140, the upper end plate 160T, and the upper cylinder 121T and communicates the lower end plate cover chamber 180S and the upper end plate cover chamber 180T.

The flow of the refrigerant due to the rotation of the rotating shaft 15 will be described below. In the upper cylinder chamber 130T, the upper piston 125T fitted to the upper eccentric portion 152T of the rotating shaft 15 by the rotation of the rotating shaft 15 is along the inner peripheral surface 137T (outer peripheral surface of the upper cylinder chamber 130T) of the upper cylinder 121T. The upper suction chamber 131T sucks the refrigerant from the suction pipe 105 while expanding the volume, the upper compression chamber 133T compresses the refrigerant while reducing the volume, and the pressure of the compressed refrigerant is the upper discharge valve 200T. When the pressure becomes higher than the pressure of the upper end plate cover chamber 180T on the outer side of the above, the upper discharge valve 200T opens and the refrigerant is discharged from the upper compression chamber 133T to the upper end plate cover chamber 180T. The refrigerant discharged to the upper end plate cover chamber 180T is discharged into the compressor housing 10 from the upper end plate cover discharge hole 172T (see FIG. 1) provided in the upper end plate cover 170T.

Further, in the lower cylinder chamber 130S, the lower piston 125S fitted into the lower eccentric portion 152S of the rotating shaft 15 due to the rotation of the rotating shaft 15 is the inner peripheral surface 137S of the lower cylinder 121S (the outer peripheral surface of the lower cylinder chamber 130S). By revolving along, the lower suction chamber 131S sucks the refrigerant from the suction pipe 105 while expanding the volume, the lower compression chamber 133S compresses the refrigerant while reducing the volume, and the pressure of the compressed refrigerant is discharged downward. When the pressure becomes higher than the pressure of the lower end plate cover chamber 180S on the outer side of the valve 200S, the lower discharge valve 200S opens and the refrigerant is discharged from the lower compression chamber 133S to the lower end plate cover chamber 180S. The refrigerant discharged to the lower end plate cover chamber 180S is discharged into the compressor housing 10 from the upper end plate cover discharge hole 172T provided in the upper end plate cover 170T through the refrigerant passage hole 136 and the upper end plate cover chamber 180T. ..

The refrigerant discharged into the compressor housing 10 is a notch (not shown) that communicates with the upper and lower sides provided on the outer periphery of the stator 111, a gap in the winding portion of the stator 111 (not shown), or the stator 111. It is guided above the motor 11 through the gap 115 (see FIG. 1) between the compressor and the rotor 112, and is discharged from the discharge pipe 107 arranged at the upper part of the compressor housing 10.

(Characteristic configuration of rotary compressor)
Next, the characteristic configuration of the rotary compressor 1 of the embodiment will be described. The features of the embodiment include an upper suction valve 143T that opens and closes the upper suction hole 135T of the compression unit 12, and a lower suction valve 143S that opens and closes the lower suction hole 135S.

(Structure of the main part in the example)
FIG. 3 is a plan view showing a main part of the rotary compressor 1 of the embodiment. FIG. 4 is a plan view showing the upper end surface 140a side of the intermediate partition plate 140 of the rotary compressor 1 of the embodiment. FIG. 5 is a vertical sectional view showing a main part of the rotary compressor 1 of the embodiment.

As shown in FIGS. 1 and 5, the connection hole 134 provided in the lateral protrusion 141 of the intermediate partition plate 140 has a suction passage 135A extending from the suction pipe 105 and a branch from the suction passage 135A to the upper cylinder 121T side. It has an upper suction hole 135T penetrating into the lower suction hole 135T and a lower suction hole 135S branching from the suction path 135A and penetrating to the lower cylinder 121S side.

The upper suction hole 135T is inclined with respect to the thickness direction of the intermediate partition plate 140 (the axial direction of the rotating shaft 15) and extends toward the upper cylinder chamber 130T. The lower suction hole 135S is inclined with respect to the thickness direction of the intermediate partition plate 140 and extends toward the lower cylinder chamber 130S. Therefore, the upper suction hole 135T and the lower suction hole 135S are branched from the suction path 135A so as to form a V shape. The upper suction hole 135T and the lower suction hole 135S are set, for example, to have an inclination angle of about 45 degrees with respect to the thickness direction of the intermediate partition plate 140. On the upper end surface 140a and the lower end surface 140b of the intermediate partition plate 140, the upper suction hole 135T and the lower suction hole 135S have, for example, an elliptical opening. Although not shown, the upper suction hole 135T and the lower suction hole 135S are branched from the suction path 135A so as to form a T shape by penetrating the intermediate partition plate 140 along the thickness direction of the intermediate partition plate 140. May be good.

As shown in FIGS. 3, 4 and 5, the upper suction hole 135T is provided with a lead valve type upper suction valve 143T whose tip portion 143a opens and closes the upper suction hole 135T. The lower suction hole 135S is provided with a lead valve type lower suction valve 143S whose tip portion 143a opens and closes the lower suction hole 135S.

The upper suction valve 143T is formed in a circular shape such that the tip portion 143a closes the upper suction hole 135T, and is formed so as to extend from the circular tip portion 143a to the base end portion 143b in a strip shape. The lower suction valve 143S is formed in a circular shape such that the tip portion 143a closes the lower suction hole 135S, and is formed so as to extend from the circular tip portion 143a to the base end portion 143b in a band shape.

In this embodiment, as shown in FIGS. 4 and 5, the base end portions 143b of the upper suction valve 143T and the lower suction valve 143S are fixed to the intermediate partition plate 140. As a result, the positions of the tip portions 143a of the upper suction valve 143T and the lower suction valve 143S can be easily positioned with respect to the upper suction hole 135T and the lower suction hole 135S, so that the accuracy and stability of the opening / closing operation of the tip portion 143a can be improved. Be enhanced.

The upper suction valve 143T is arranged outside the upper cylinder chamber 130T in the radial direction of the upper cylinder 121T. The upper suction valve 143T is provided on a concave valve seat (not shown) formed on the upper end surface 140a of the intermediate partition plate 140. The lower suction valve 143S is arranged outside the lower cylinder chamber 130S in the radial direction of the lower cylinder 121S. The lower suction valve 143S is provided on a concave valve seat (not shown) formed on the lower end surface 140b of the intermediate partition plate 140.

Further, as shown in FIG. 4, the upper suction valve 143T and the lower suction valve 143S are arranged so that their contours overlap when viewed from the axial direction of the rotary shaft 15. In other words, as shown in FIG. 5, the tip portion 143a of the upper suction valve 143T and the tip portion 143a of the lower suction valve 143S face each other with the intermediate partition plate 140 interposed therebetween, and are opposed to the base end portion 143b of the upper suction valve 143T. The base end portion 143b of the lower suction valve 143S faces the intermediate partition plate 140 with the intermediate partition plate 140 interposed therebetween. As a result, the upper suction valve 143T and the lower suction valve 143S are compactly arranged in the lateral protrusion 141 of the intermediate partition plate 140, and the upper protrusion 122T of the upper cylinder 121T to which the upper suction recess 146T described later is formed, and the upper protrusion 122T. It is possible to prevent the downward protrusion 122S of the lower cylinder 121S on which the lower suction recess 146S, which will be described later, is formed from becoming large.

Further, the position of the tip portion 143a of the upper suction valve 143T is arranged inside the position of the base end portion 143b in the radial direction of the upper cylinder 121T. The position of the tip portion 143a of the lower suction valve 143S is arranged inside the position of the base end portion 143b in the radial direction of the lower cylinder 121S. Further, as described above, the upper suction hole 135T is extended toward the upper cylinder chamber 130T, and the lower suction hole 135S is extended toward the lower cylinder chamber 130S. As a result, the position of the base end portion 143b of the upper suction valve 143T when the upper suction hole 135T is opened is arranged so that the refrigerant sucked from the upper suction hole 135T is retracted from the direction in which the refrigerant sucked from the upper suction hole 135T flows toward the upper cylinder chamber 130T. The position of the base end portion 143b of the lower suction valve 143S when the lower suction hole 135S is opened is arranged so that the refrigerant sucked from the lower suction hole 135S is retracted from the direction in which the refrigerant sucked from the lower suction hole 135S flows toward the lower cylinder chamber 130S. .. Therefore, it is possible to prevent the refrigerant sucked from the upper suction hole 135T and the lower suction hole 135S from being sprayed onto the upper suction valve 143T and the lower suction valve 143S. It is possible to prevent the flow of the refrigerant sucked from the 135T and the lower suction hole 135S from being obstructed.

Further, the compression portion 12 of the rotary compressor 1 has an upper rivet 155T for fixing the base end portion 143b of the upper suction valve 143T in the upper suction recess 146T and an upper suction valve retainer 156T for regulating the opening degree of the upper suction valve 143T. A lower rivet 155S for fixing the base end portion 143b of the lower suction valve 143S in the lower suction recess 146S, and a lower suction valve retainer 156S for regulating the opening degree of the lower suction valve 143S are provided.

The upper rivet 155T is passed through a fixing hole (not shown) of the base end portion 143b of the upper suction valve 143T and a fixing hole (not shown) of the base end portion 156b of the upper suction valve retainer 156T, and is passed through the upper suction valve 143T. And the upper suction valve retainer 156T is fixed to the upper end surface 140a side of the intermediate partition plate 140. The lower rivet 155S is passed through a fixing hole (not shown) of the base end portion 143b of the lower suction valve 143S and a fixing hole (not shown) of the base end portion 156b of the lower suction valve retainer 156S, and is passed through the lower suction valve 143S. And the lower suction valve retainer 156S is fixed to the lower end surface 140b side of the intermediate partition plate 140.

The upper suction valve retainer 156T is housed in the upper suction recess 146T and is arranged above the upper suction valve 143T. In the upper suction valve retainer 156T, the tip portion 156a is warped in the direction of opening the upper suction valve 143T, and the base end portion 156b is overlapped with the base end portion 143b of the upper suction valve 143T and the upper rivet 155T is formed in the upper suction recess 146T. Fixed by.

The lower suction valve retainer 156S is housed in the lower suction recess 146S and is arranged below the lower suction valve 143S. In the lower suction valve retainer 156S, the tip portion 156a is warped in the direction of opening the lower suction valve 143S, and the base end portion 156b is overlapped with the base end portion 143b of the lower suction valve 143S and the lower rivet 155S is formed in the lower suction recess 146S. Fixed by.

By providing the upper suction valve retainer 156T and the lower suction valve retainer 156S in this way, it is possible to prevent the upper suction valve 143T from coming into contact with the upper cylinder 121T when the upper suction hole 135T is opened, and the lower suction hole 135S is opened. At this time, it is possible to prevent the lower suction valve 143S from coming into contact with the lower cylinder 121S. Therefore, the upper suction valve 143T and the lower suction valve 143S can be appropriately opened and closed with respect to the upper suction hole 135T and the lower suction hole 135S.

In this embodiment, the upper suction valve 143T and the upper suction valve retainer 150T are fixed to the intermediate partition plate 140 side by the upper rivet 155T, but the structure is not limited to this, and the upper suction valve retainer 150T may be fixed to the upper cylinder 121T side. good. Similarly, the lower suction valve 143S and the lower suction valve retainer 150S are fixed to the intermediate partition plate 140 side by the lower rivet 155S, but are not limited to this structure. It may be fixed to the lower cylinder 121S side.

FIG. 6 is a perspective view showing the upper cylinder 121T of the rotary compressor 1 of the embodiment from above. FIG. 7 is a perspective view showing the upper cylinder 121T of the rotary compressor 1 of the embodiment from below.

As shown in FIGS. 6 and 7, the upper cylinder 121T has an upper suction recess 146T extending from the upper suction hole 135T to the upper cylinder chamber 130T, and an upper suction recess 146T having an upper suction recess 146T opening to an inner peripheral surface 137T of the upper cylinder 121T. It has a mouth 147T and. The lower cylinder 121S has a lower suction recess 146S extending from the lower suction hole 135S to the lower cylinder chamber 130S, and a lower suction port 147S in which the lower suction recess 146S opens to the inner peripheral surface 137S of the lower cylinder 121S.

The upper suction recess 146T has an upper connecting path 148T connected to the upper cylinder chamber 130T via the upper suction port 147T, and an upper suction valve accommodating recess 149T in which the upper suction valve 143T and the upper suction valve retainer 156T are accommodated. The lower suction recess 146S has a lower connecting path 148S connected to the lower cylinder chamber 130S via the lower suction port 147S, and a lower suction valve accommodating recess 149S in which the lower suction valve 143S and the lower suction valve retainer 156S are accommodated.

The upper connecting path 148T and the upper suction valve accommodating recess 149T are continuously provided, and are formed on the lower end surface 121b side of the upper cylinder 121T in contact with the intermediate partition plate 140. As shown in FIGS. 3, 6 and 7, the upper connecting path 148T extends linearly along the radial direction of the upper cylinder 121T from the upper suction hole 135T toward the upper cylinder chamber 130T, and is upper. It is formed so as to gradually approach the upper vane groove 128T toward the suction port 147T side. The upper suction valve accommodating recess 149T extends linearly from the upper suction hole 135T toward the outside in the radial direction of the upper cylinder 121T, and is on the opposite side of the upper vane groove 128T with respect to the upper connecting path 148T. It is formed by bending.

Similarly, the lower connecting path 148S and the lower suction valve accommodating recess 149S are continuously provided, and are formed on the upper end surface 121a side of the lower cylinder 121S in contact with the intermediate partition plate 140. The lower connecting path 148S extends linearly from the lower suction hole 135S toward the lower cylinder chamber 130S along the radial direction of the lower cylinder 121S, and gradually extends into the lower vane groove 128S toward the lower suction port 147S side. It is formed to approach. The lower suction valve accommodating recess 149S extends linearly from the lower suction hole 135S toward the outside in the radial direction of the lower cylinder 121S, and is on the side opposite to the lower vane groove 128S with respect to the lower connecting path 148S. It is formed by bending.

FIG. 8 is a vertical sectional view showing the upper suction port 147T and the lower suction port 147S in the embodiment from the inside of the upper cylinder chamber 130T and the lower cylinder chamber 130S.

As shown in FIGS. 6, 7 and 8, the upper suction port 147T is arranged at a position adjacent to the upper vane groove 128T in the circumferential direction of the inner peripheral surface 137T of the upper cylinder 121T. The upper suction port 147T is formed as a square opening by being partitioned by the upper end surface 140a of the intermediate partition plate 140, and is the axial direction of the rotating shaft 15 in the height direction of the inner peripheral surface 137T of the upper cylinder 121T. It is spread to. Similarly, the lower suction port 147S is arranged at a position adjacent to the lower vane groove 128S in the circumferential direction of the inner peripheral surface 137S of the lower cylinder 121S. The lower suction port 147S is formed as a square opening by being partitioned by the lower end surface 140b of the intermediate partition plate 140, and is the axial direction of the rotating shaft 15 in the height direction of the inner peripheral surface 137S of the lower cylinder 121S. It is spread to.

In this embodiment, the upper suction recess 146T is formed in the upper cylinder 121T, and the lower suction recess 146S is formed in the lower cylinder 121S, so that a large opening area of the upper suction port 147T and the lower suction port 147S can be secured. Since it becomes easy, the flow resistance of the refrigerant sucked into the upper cylinder chamber 130T and the lower cylinder chamber 130S can be suppressed to a small value, and the compression efficiency of the refrigerant can be improved.

(Opening and closing operation of upper suction valve and lower suction valve)
In the compression section 12, the upper suction valve 143T elastically deforms and opens when the refrigerant sucked from the suction pipe 105 passes through the suction path 135A of the connection hole 134 and the refrigerant passes through the upper suction hole 135T, and the refrigerant sucks downward. When the lower suction valve 143S is elastically deformed and opened when passing through the hole 135S, the refrigerant is sent from the upper suction hole 135T and the lower suction hole 135S to the upper suction recess 146T and the lower suction recess 146S. The refrigerant sent to the upper suction recess 146T flows through the upper connecting path 148T, passes through the upper suction port 147T, and is supplied to the upper suction chamber 131T (see FIG. 2) of the upper cylinder chamber 130T. The refrigerant sent to the lower suction recess 146S flows through the lower connecting path 148S, passes through the lower suction port 147S, and is supplied to the lower suction chamber 131S (see FIG. 2) of the lower cylinder chamber 130S. Further, when the refrigerant does not pass through the upper suction hole 135T, the upper suction hole 135T is closed by the upper suction valve 143T, and when the refrigerant does not pass through the lower suction hole 135S, the lower suction hole 135S is closed by the lower suction valve 143S.

In this embodiment, of the upper cylinder 121T and the lower cylinder 121S, which are driven with a phase difference of 180 degrees around the rotating shaft 15 when the refrigerant is sucked from the suction pipe 105 into the upper cylinder 121T and the lower cylinder 121S. When the suction force of one cylinder is small, the suction force of the other cylinder is large, so that a part of the refrigerant sucked into one cylinder may flow back so that it is sucked into the other cylinder. be. Even when the refrigerant flows backward in this way, the upper suction hole 135T is closed by the upper suction valve 143T, and the lower suction hole 135S is closed by the lower suction valve 143S. It can be suppressed from passing through the suction hole 135S.

Further, when the refrigerant sucked into one cylinder flows backward from one cylinder toward the other cylinder, the refrigerant flowing into the upper suction recess 146T through the upper suction port 147T flows into the upper connecting path 148T and The refrigerant that stays in the upper suction valve accommodating recess 149T and flows into the lower suction recess 146S through the lower suction port 147S stays in the lower connecting path 148S and the lower suction valve accommodating recess 149S. As described above, in the embodiment, in particular, the volume in the upper connecting path 148T in the upper suction recess 146T and the volume in the lower connecting path 148S in the lower suction recess 146S flow back from the upper cylinder chamber 130T through the upper suction port 147T. Since the refrigerant acts as a so-called buffer space for temporarily holding the refrigerant flowing back from the lower cylinder chamber 130S through the lower suction port 147S, it is possible to prevent the backflowing refrigerant from passing through the upper suction hole 135T and the lower suction hole 135S. ..

Therefore, the upper suction valve 143T and the lower suction valve 143S act as a so-called check valve, and the upper suction recess 146T and the lower suction recess 146S act as a buffer space, so that one of the upper cylinder 121T and the lower cylinder 121S It is possible to effectively suppress the backflow of the refrigerant from one cylinder to the other cylinder.

Although not shown, in a two-suction type rotary compressor provided with an upper suction pipe and a lower suction pipe, the height of the rotation axis in the axial direction of the upper cylinder to which the upper suction pipe is connected and the lower cylinder to which the lower suction pipe is connected is high. There is an inconvenience that the cylinder becomes large. On the other hand, in the rotary compressor 1 of the embodiment, as described above, the upper suction port is suppressed from increasing the heights of the upper cylinder 121T and the lower cylinder 121S without reducing the pipe diameter of the suction pipe 105. The compression efficiency is enhanced by ensuring a large opening area of the 147T and the lower suction port 147S. Further, according to the embodiment, in the one suction type rotary compressor 1 in which the refrigerant is sucked into the upper cylinder 121T and the lower cylinder 121S by one suction pipe 105, the refrigerant that is likely to occur between the upper cylinder 121T and the lower cylinder 121S. Backflow can be suppressed.

(Effect of Examples)
As described above, in the rotary compressor 1 of the embodiment, the connection hole 134 of the intermediate partition plate 140 has a suction passage 135A extending from the suction pipe 105 and an upper suction hole branching from the suction passage 135A and penetrating to the upper cylinder 121T side. It has a 135T and a lower suction hole 135S that branches from the suction path 135A and penetrates to the lower cylinder 121S side. The upper suction valve 143T is provided, and the lower suction hole 135S is provided with a lead valve type lower suction valve 143S whose tip portion 143a opens and closes the lower suction hole 135S. Therefore, the upper suction valve 143T and the lower suction valve 143S can prevent the refrigerant sucked into one of the upper cylinder 121T and the lower cylinder 121S from flowing back toward the other cylinder. As a result, it is possible to suppress a decrease in the circulation flow rate of the refrigerant in the entire rotary compressor 1 and improve the efficiency of the rotary compressor 1.

Further, in the rotary compressor 1 of the embodiment, the upper cylinder 121T opens the upper suction recess 146T extending from the upper suction hole 135T to the upper cylinder chamber 130T and the upper suction recess 146T opens to the inner peripheral surface 137T of the upper cylinder 121T. A lower suction port having a suction port 147T, the lower cylinder 121S extending from the lower suction hole 135S to the lower cylinder chamber 130S, and a lower suction recess 146S opening to the inner peripheral surface 137S of the lower cylinder 121S. The upper suction valve 143T is arranged outside the upper cylinder chamber 130T in the radial direction of the upper cylinder 121T, and the lower suction valve 143S is arranged in the radial direction of the lower cylinder chamber 130S of the lower cylinder chamber 130S. It is located on the outside. As a result, the volume in the upper suction recess 146T and the volume in the lower suction recess 146S flow back from the upper cylinder chamber 130T through the upper suction port 147T, and from the lower cylinder chamber 130S through the lower suction port 147S. It works as a so-called buffer space that temporarily retains the generated refrigerant. Therefore, it is possible to further suppress the refrigerant flowing back from one cylinder toward the other cylinder from passing through the upper suction hole 135T and the lower suction hole 135S.

Further, the rotary compressor 1 of the embodiment includes an upper suction valve retainer 156T that regulates the opening degree of the upper suction valve 143T and a lower suction valve retainer 157T that regulates the opening degree of the lower suction valve 143S. As a result, it is possible to prevent the upper suction valve 143T from coming into contact with the upper cylinder 121T when the upper suction hole 135T is opened, and to prevent the lower suction valve 143S from coming into contact with the lower cylinder 121S when the lower suction hole 135S is opened. .. Therefore, the upper suction valve 143T and the lower suction valve 143S can be appropriately opened and closed with respect to the upper suction hole 135T and the lower suction hole 135S.

Further, in the rotary compressor 1 of the embodiment, the upper suction valve 143T and the lower suction valve 143S are arranged so that their contours overlap when viewed from the axial direction of the rotary shaft 15. This makes it possible to compactly arrange the upper suction valve 143T and the lower suction valve 143S on the intermediate partition plate 140, and the upper cylinder 121T on which the upper suction recess 146T is formed and the lower cylinder 121T on which the lower suction recess 146S is formed are formed. It is possible to prevent the cylinder 121S from becoming large.

Further, in the rotary compressor 1 of the embodiment, the upper suction hole 135T is inclined with respect to the thickness direction of the intermediate partition plate 140 and is extended toward the upper cylinder chamber 130T, and the tip portion 143a of the upper suction valve 143T is formed. Arranged inside the upper cylinder 121T in the radial direction from the base end portion 143b, the lower suction hole 135S is inclined with respect to the thickness direction of the intermediate partition plate 140 and extended toward the lower cylinder chamber 130S, and lower suction is performed. The tip portion 143a of the valve 143S is arranged inside the base end portion 143b in the radial direction of the lower cylinder 121S. As a result, it is possible to prevent the refrigerant sucked from the upper suction hole 135T and the lower suction hole 135S from being sprayed onto the upper suction valve 143T and the lower suction valve 143S. It is possible to prevent the flow of the refrigerant sucked from the 135T and the lower suction hole 135S from being obstructed.

Further, the upper suction valve 143T and the lower suction valve 143S in the rotary compressor 1 of the embodiment are fixed to the intermediate partition plate 140. As a result, the positions of the tip portions 143a of the upper suction valve 143T and the lower suction valve 143S can be easily positioned with respect to the upper suction hole 135T and the lower suction hole 135S, so that the accuracy and stability of the opening / closing operation of the tip portion 143a can be improved. Be enhanced.

1 Rotary compressor 11 Motor 12 Compressor 15 Rotating shaft 105 Suction pipe 121T Upper cylinder 121S Lower cylinder 125T Upper piston 125S Lower piston 127T Upper vane 127S Lower vane 128T Upper vane groove 128S Lower vane groove 130T Upper cylinder chamber 130S Lower cylinder chamber 131T Upper suction chamber 131S Lower suction chamber 133T Upper compression chamber 133S Lower compression chamber 134 Connection hole 135A Suction path 135T Upper suction hole 135S Lower suction hole 137T Inner peripheral surface 137S Inner peripheral surface 140 Intermediate partition plate 143T Upper suction valve 143S Lower suction valve 143a Tip 143b Base end 146T Upper suction recess 146S Lower suction recess 147T Upper suction port 147S Lower suction port 148T Upper connecting path 148S Lower connecting path 149T Upper suction valve accommodating recess 149S Lower suction valve accommodating recess 152T Upper eccentric part 152S Lower eccentric part 155T Upper rivet 155S Lower rivet 156T Upper suction valve retainer 156S Lower suction valve retainer 156a Tip 156b Base end 160T Top plate 160S Bottom plate

Claims (6)

A compressor housing provided with a refrigerant discharge pipe and a suction pipe, a compression unit arranged inside the compressor housing, compressing the refrigerant sucked from the suction pipe, and discharging the refrigerant from the discharge pipe. A motor, which is arranged in the compressor housing and drives the compressor, is provided.
The compression unit is
An annular upper cylinder and an annular lower cylinder,
An upper end plate that closes the upper side of the upper cylinder and a lower end plate that closes the lower side of the lower cylinder,
An intermediate partition plate arranged between the upper cylinder and the lower cylinder and closing the lower side of the upper cylinder and the upper side of the lower cylinder,
A rotating shaft supported by the upper end plate and the lower end plate and rotated by the motor,
An upper eccentric portion and a lower eccentric portion provided on the rotating shaft with a phase difference from each other,
An upper piston that is fitted into the upper eccentric portion and rotates along the inner peripheral surface of the upper cylinder to form an upper cylinder chamber in the upper cylinder.
A lower piston that is fitted into the lower eccentric portion and rotates along the inner peripheral surface of the lower cylinder to form a lower cylinder chamber in the lower cylinder.
An upper vane that protrudes into the upper cylinder chamber from the upper vane groove provided in the upper cylinder and is in contact with the upper piston to partition the upper cylinder chamber into an upper suction chamber and an upper compression chamber.
A lower vane that protrudes into the lower cylinder chamber from the lower vane groove provided in the lower cylinder and is in contact with the lower piston to partition the lower cylinder chamber into a lower suction chamber and a lower compression chamber.
In a rotary compressor with
The intermediate partition plate has a connection hole to which the suction pipe is connected.
The connection holes are a suction path extending from the suction pipe, an upper suction hole branching from the suction path and penetrating the upper cylinder side, and a lower suction hole branching from the suction path and penetrating the lower cylinder side. And have
The upper suction hole is provided with a lead valve type upper suction valve whose tip opens and closes the upper suction hole.
A rotary compressor in which a lead valve type lower suction valve whose tip portion opens and closes the lower suction hole is provided in the lower suction hole. The upper cylinder has an upper suction recess extending from the upper suction hole to the upper cylinder chamber, and an upper suction port at which the upper suction recess opens to the inner peripheral surface of the upper cylinder.
The lower cylinder has a lower suction recess extending from the lower suction hole to the lower cylinder chamber, and a lower suction port in which the lower suction recess opens to the inner peripheral surface of the lower cylinder.
The upper suction valve is arranged outside the upper cylinder chamber in the radial direction of the upper cylinder.
The lower suction valve is arranged outside the lower cylinder chamber in the radial direction of the lower cylinder.
The rotary compressor according to claim 1. An upper rivet that fixes the base end of the upper suction valve into the upper suction recess,
The tip portion is warped in the direction of opening the upper suction valve to regulate the opening degree of the upper suction valve, and the base end portion is overlapped with the upper suction valve and fixed in the upper suction recess by the upper rivet. Upper suction valve retainer and
A lower rivet that fixes the base end of the lower suction valve into the lower suction recess,
The tip portion is warped in the direction of opening the lower suction valve to regulate the opening degree of the lower suction valve, and the base end portion is overlapped with the lower suction valve and fixed in the lower suction recess by the lower rivet. Lower suction valve retainer and
Further prepare
The upper suction recess has an upper suction valve accommodating recess in which the upper suction valve and the upper suction valve retainer are accommodated.
The lower suction recess has a lower suction valve accommodating recess in which the lower suction valve and the lower suction valve retainer are accommodated.
The rotary compressor according to claim 2. When viewed from the axial direction of the rotating shaft, the upper suction valve and the lower suction valve are arranged so that their contours overlap.
The rotary compressor according to any one of claims 1 to 3. The upper suction hole is inclined with respect to the thickness direction of the intermediate partition plate and is extended toward the upper cylinder chamber.
The tip portion of the upper suction valve is arranged inside the base end portion of the upper suction valve in the radial direction of the upper cylinder.
The lower suction hole is inclined with respect to the thickness direction of the intermediate partition plate and is extended toward the lower cylinder chamber.
The tip portion of the lower suction valve is arranged inside the base end portion of the lower suction valve in the radial direction of the lower cylinder.
The rotary compressor according to any one of claims 1 to 4. The upper suction valve and the lower suction valve are fixed to the intermediate partition plate.
The rotary compressor according to any one of claims 1 to 5.

Images