JP2008069758A - Hermetic compressor and refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hermetic compressor increased in efficiency and reduced in vibration by reducing the fitting resistance of a flow passage resistance and the fitting resistance between a valve plate and a suction valve. <P>SOLUTION: A suction valve 125 installed in a compression mechanism part 120 is so installed on the compression chamber 121a of a valve plate 123 as to cover a suction hole 123a. The suction valve has a hole part 125a formed between the end part P of the suction valve 125 and the suction hole 123a of the valve plate 123. A recess 124 having a depth L in the radial direction and a depth H from the valve plate 123 is formed in the inner wall surface of a cylinder 121. The end part P of the suction valve 125 is disposed in the recess. When defining the area of the hole part 125a as S, the requirement of S≥L×H is satisfied. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hermetic compressor used in a household refrigerator and the like, and a refrigeration cycle apparatus incorporating the hermetic compressor, and particularly relates to a device that can improve efficiency and reduce noise.

For example, a hermetic reciprocating compressor is used in a refrigeration cycle apparatus such as a household refrigerator. Some hermetic reciprocating compressors have been devised in various ways to damage the suction valve and improve compression efficiency. For example, it is known that a recess is provided on the inner wall surface of a cylinder, a pin is provided between the recess and the valve plate, and this pin is inserted through a hole provided in a suction valve. As a result, the tip of the suction valve can be prevented from entering the cylinder, and the top dead center position of the piston can be brought closer to the suction valve. For this reason, compression efficiency can be improved (for example, refer patent document 1).
JP 2006-70746 A

  The above-described hermetic reciprocating compressor has the following problems. That is, since a hole is provided in the suction valve and is inserted through the pin, a sufficient flow path for the refrigerant is not formed on the tip side of the suction valve, resulting in an increase in flow path resistance. For this reason, the self-excited vibration of the suction valve is also likely to occur. Further, when the valve plate and the suction valve are in close contact with each other, a resistance force is generated at the time of opening and closing, and the efficiency may be reduced.

  Accordingly, an object of the present invention is to provide a refrigeration cycle apparatus that reduces the flow path resistance of the refrigerant, improves the efficiency by reducing the adhesion resistance between the valve plate and the suction valve, and further reduces vibration. Yes.

  In order to solve the above problems and achieve the object, the hermetic reciprocating compressor and the refrigeration cycle apparatus of the present invention are configured as follows.

  A sealed case, a motor part provided in the sealed case, a cylinder provided in the sealed case and driven by the motor part to form a compression chamber, and reciprocatingly movable in the cylinder by the motor part A piston provided, a valve plate provided on the end face of the cylinder and having a suction hole and a discharge hole, a suction mechanism and a compression mechanism having a suction valve provided to be able to open and close the suction hole and the discharge hole, A concave portion having a depth L in the radial direction of the cylinder and a depth H from the valve plate is formed on the inner peripheral surface of the cylinder on the end surface side of the cylinder, and the suction valve has a tip portion in the concave portion. In the hermetic compressor positioned in a state in which the amount of displacement is regulated, the suction valve is provided with a hole having an area S between the tip and a position corresponding to the suction hole. Area S facing the compression chamber of the hole portion, the depth L, a relationship between the distance H, characterized in that it is a S ≧ L × H.

  According to the present invention, it is possible to improve efficiency by reducing the flow resistance and reducing the adhesion resistance between the valve plate and the suction valve, and further reduce vibration.

  FIG. 1 is a longitudinal sectional view showing a configuration of a refrigeration cycle apparatus 1 and a hermetic reciprocating compressor 100 according to a first embodiment of the present invention, and FIG. 2 is a compression mechanism used for the hermetic reciprocating compressor 100. FIG. 3 is an explanatory view showing a suction valve 125 of the compression mechanism 120. In FIG. 1, R represents refrigeration oil, and F in FIG. 2 represents a refrigerant flow path.

  The refrigeration cycle apparatus 1 is connected to the hermetic reciprocating compressor 100, the condenser 200 connected to the discharge side of the hermetic reciprocating compressor 100, the expansion device 300 connected to the condenser 200, and the expansion device 300. The evaporator 400 is connected and configured.

  The hermetic reciprocating compressor 100 includes a frame 110 that is elastically supported in a hermetic case 101 by a spring 102 via a stator 132 of an electric motor unit 130, and a compression mechanism unit 120 that is disposed above the frame 110. And the above-described electric motor unit 130 disposed below the frame 110. The sealed case 101 includes an upper lid 101a for sealing the sealed case 101. The compression mechanism unit 120 and the electric motor unit 130 are connected by a rotating shaft 140 that is fitted and supported by a pivot hole 111 provided in the frame 110, and the compression mechanism unit 120 is driven by the electric motor unit 130. .

  The compression mechanism 120 is placed on the upper surface of the frame 110 and is connected to a cylinder 121 forming a compression chamber 121a from a crank pin 141 described later via a ball joint mechanism 150 so as to be freely reciprocated in the compression chamber. And a piston 122. The ball joint mechanism 150 includes a large end 151 that is rotatably fitted to the crank pin 141 of the rotating shaft 140, a connecting member 152 that is coupled to the large end 151, and a ball provided on the connecting member 152. 153, and the ball 153 and the piston 122 are fitted by a fitting portion 154 integrally formed with the piston 122 so that the ball 153 and the piston 122 can be freely rotated.

  The electric motor unit 130 includes a rotor 131 fixed to the rotating shaft 140 and a stator 132 fixed to the frame 110. The rotor 131 has a permanent magnet, and the stator 132 has a coil wound by a concentrated winding method.

  The rotating shaft 140 is provided with a crank pin 141 having a central shaft that rotates eccentrically by a predetermined amount when the rotating shaft 140 rotates via a flange 142 on the upper surface of the frame 110.

  The end surface of the cylinder 121 is closed by a valve plate 123, and a recess 124 is provided on the inner wall surface of the cylinder 121.

  The valve plate 123 has a suction hole 123a and a discharge hole 123b, and a suction valve 125 and a discharge valve 126 are provided corresponding to the suction hole 123a and the discharge hole 123b. The surface of the valve plate 123 opposite to the cylinder 121 is covered with a valve cover 127, and the valve cover 127 further has a partition portion that bisects the inside. One of the partition portions of the valve cover 127 is formed with a suction chamber 127 a provided so as to cover the suction hole 123 a, and the other is formed with a discharge chamber 127 b provided so as to cover the discharge valve 126. The suction chamber 127 a is communicated with the evaporator 400 through the space inside the sealed case, and the discharge chamber 127 b is connected to the condenser 200 through the discharge pipe 128.

As shown in FIGS. 2 and 3, the suction valve 125 is provided such that the front end portion P side is swingable, and the front end portion P is provided so as to be located outside the inner diameter of the cylinder 121 and accommodated in the recess 124. It has become. Furthermore, the suction valve 125 is provided on the compression chamber 121a side of the valve plate 123 so as to cover the suction hole 123a. A hole 125 a is provided between the tip P of the suction valve 125 and the suction hole 123 a of the valve plate 123. In a state where the suction hole 123a is closed by the suction valve 125 (the suction valve 125 is closed), the area of the hole 125a facing the compression chamber 121a is S, and the bore length of the recess 124 described above (in the radial direction of the cylinder 121). S = L × H (1) where L is the depth and H is the depth of the recess 124 (the depth from the valve plate 123).
The relationship is established.

  In the refrigeration cycle apparatus 1 configured as described above, first, by supplying external energy (for example, a commercial power source) to the motor unit 130 of the hermetic reciprocating compressor 100, the rotor 131 rotates and is fixed to the rotor 131. The rotation shaft 140 thus rotated rotates. Due to the rotation of the rotating shaft 140, the crank pin 141 formed integrally with the rotating shaft 140 rotates eccentrically. The eccentric rotation of the crank pin 141 is converted into a reciprocating motion of the piston 122 by the ball joint mechanism 150, and the piston 122 reciprocates in the compression chamber 121a. The refrigerant is compressed by the reciprocating motion of the piston 122. The compressed refrigerant passes from the discharge hole 123b through the discharge valve 126, passes through the discharge chamber 127b, and is discharged from the hermetic reciprocating compressor 100 to the condenser 200 through the discharge pipe 128. Further, the expansion device 300 and the evaporator 400 are discharged. Pass through sequentially. The refrigerant that has passed through the evaporator 400 is guided to the space in the sealed case of the hermetic reciprocating compressor 100 through the refrigerant pipe, further passes through the suction chamber 127a, and from the suction hole 123a to the compression chamber 121a through the suction valve 125. Return to.

  Here, when the refrigerant passes through the suction valve 125, the refrigerant flows from the suction hole 123a toward the compression chamber 121a, and in the compression chamber 121a, the piston 122 is opposite to the valve plate 123 (away from the valve plate 123). Move in the direction. For this reason, the inside of the compression chamber 121a is in a low pressure state, whereby the opened discharge valve 126 is closed and the suction valve 125 is opened (see the two-dot chain line suction valve 125 shown in FIG. 2). When the suction valve 125 is opened, the recess 124 receives the suction valve 125 and restricts the displacement of the suction valve 125, thereby preventing the suction valve 125 from being damaged.

  When the suction valve 125 is opened as described above, the refrigerant flow path is formed between the side of the suction valve 125 and the hole 125a (the refrigerant flow path by the hole 125a) by the hole 125a provided in the opened suction valve 125. F) and the refrigerant is filled in the compression chamber 121a.

  As described above, according to the refrigeration cycle apparatus 1 according to the present embodiment, by providing the hole 125a in the suction valve 125, it is possible to ensure a sufficient flow path, the flow path resistance is reduced, Efficiency is improved. That is, when the hole 125a is not provided, the flow path is cut off at the concave portion 124 and the tip portion P of the suction valve 125, so that the flow path can be secured only in the side surface direction of the suction valve 125. Such a problem can be solved by the suction valve 125 according to the embodiment. Further, since the self-excited vibration of the suction valve 125 is suppressed as the flow path resistance decreases, noise is reduced.

  Furthermore, since the area of the suction valve 125 is reduced by the area S of the hole 125a by providing the hole 125a in the suction valve 125, the contact area between the valve plate 123 and the suction valve 125 due to the surface tension of the refrigerator oil R is reduced. Decrease. If the contact area decreases, the contact resistance decreases, so that the delay in opening the suction valve 125 decreases, and the efficiency of the suction valve 125 portion is improved by the smooth opening and closing of the suction valve 125.

  It should be noted that a sufficient flow path can be obtained by satisfying the relationship of S ≧ L × H among the area S of the hole 125a, the bore length L of the recess 124, and the depth H of the recess 124. Can be secured.

  FIG. 4 is a cross-sectional view showing a compression mechanism 120A used in the hermetic reciprocating compressor 100A of the refrigeration cycle apparatus 1A according to the second embodiment of the present invention, and FIG. 5 is a suction valve 125A of the compression mechanism 120A. It is explanatory drawing which shows. 4 and 5, the same functional parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 4 and 5, the valve plate 123A has two suction holes 123c and a discharge hole 123b, and a suction valve 125A and a discharge valve 126 are provided corresponding to the suction hole 123c and the discharge hole 123b. It has been.

  The suction valve 125A is provided on the compression chamber 121a side of the valve plate 123A so as to cover the suction hole 123c, and the tip portion P of the suction valve 125A is formed to be located outside the inner diameter of the cylinder 121. A hole 125a is provided between the tip P of the suction valve 125A and the suction hole 123c of the valve plate 123A. The two suction holes 123c of the valve plate 123A are provided at positions symmetrical with respect to the center line X passing through the distal end portion P and the proximal end portion side K of the suction valve 125A.

  According to the refrigeration cycle apparatus 1A according to the present embodiment described above, more holes can be secured by providing the suction valve 125A with the hole 125a and the valve plate 123A with the two suction holes 123c. The flow resistance is reduced and the efficiency is improved. Further, since the flow path resistance is reduced, the self-excited vibration of the suction valve 125A due to the flow path resistance is suppressed, so that noise is reduced.

  The present invention is not limited to the above embodiment. For example, in the above-described example, it has been described that the compression mechanism unit 120 is disposed above the sealed case 101 and the motor unit 130 is disposed below, but the compression mechanism unit 120 is disposed below the sealed case 101 and the motor unit 130 is disposed above. But it can be applied. In the above-described example, the frame 110 and the cylinder 121 are provided separately, but the frame 110 and the cylinder 121 can also be applied integrally. In addition, although one or two suction holes 123a and 123c are provided as described above, a plurality of suction holes 123a and 123c are also applicable. In addition, various modifications can be made without departing from the scope of the present invention.

The longitudinal cross-sectional view which shows the structure of the refrigerating-cycle apparatus which concerns on the 1st Embodiment of this invention, and a hermetic reciprocating compressor. Sectional drawing which shows the compression mechanism part used for the sealed reciprocating compressor. Explanatory drawing which shows the suction valve of the compression mechanism part. Sectional drawing which shows the compression mechanism part used for the closed type reciprocating compressor of the refrigerating-cycle apparatus which concerns on the 2nd Embodiment of this invention. It is explanatory drawing which shows the suction valve of the compression mechanism part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Refrigeration cycle apparatus, 100, 100A ... Sealing type reciprocating compressor, 101 ... Sealing case, 102 ... Spring, 110 ... Frame, 111 ... Pivoting hole, 120 ... Compression mechanism part, 121 ... Cylinder, 121a DESCRIPTION OF SYMBOLS ... Compression chamber, 122 ... Piston, 130 ... Electric motor part, 123 ... Valve plate, 123a ... Suction hole, 123b ... Discharge hole, 127 ... Valve cover, 128 ... Refrigerant pipe, 140 ... Rotating shaft, 141 ... Crank pin, 150 ... Ball joint mechanism 151, large end, 152 connecting member, 153 ball joint, 154 fitting part, 200 condenser, 300 expansion device, 400 evaporator, P tip, K base End side.

Claims (3)

A sealed case;
An electric motor provided in the sealed case;
A cylinder that is provided in the sealed case and is driven by the electric motor unit to form a compression chamber, a piston that is reciprocally movable in the cylinder by the electric motor unit, a suction hole and a discharge port that are provided on an end surface of the cylinder. A valve plate having a hole, a suction valve provided so as to be able to open and close the suction hole and the discharge hole, and a compression mechanism having a discharge valve,
A concave portion having a depth L in the radial direction of the cylinder and a depth H from the valve plate is formed on the inner peripheral surface of the cylinder on the end face side of the cylinder,
In the hermetic compressor, the suction valve is located in a state where the tip portion thereof is regulated in the displacement amount in the recess.
The suction valve is provided with a hole having an area S between the tip and a position corresponding to the suction hole, and the area S facing the compression chamber of the hole has the depth L and the distance. The relationship with H
S ≧ L × H
A hermetic compressor characterized by being   The said valve plate is equipped with two suction holes, These two suction holes are arrange | positioned in the symmetrical position with respect to the centerline which passes along the said front-end | tip part from the base end part of the said suction valve. The hermetic compressor according to 1. A hermetic compressor according to any one of claims 1 and 2,
A condenser connected to the hermetic compressor;
An expansion device connected to the condenser;
A refrigeration cycle apparatus comprising: an evaporator connected to the expansion device.

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