JPH09144659A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the shock when an intake reed valve collides with a valve seat plate at the time of closing of an intake hole so as to reduce shock noise produced at that time by arranging a coil spring penetrated on the intake hole of the valve seat plate on the opening of a passage pipe. SOLUTION: In a cylinder head 27, a penetrating hole on which the end part of a passage pipe 18 is penetrated is arranged on a position corresponding to an intake hole 22. A coil spring 28 which extends from an opening 18a is appropriately fixed to the opening 18a of a passage pipe 18 end part. The passage pipe 18 end part is arranged so that the opening 18a is opposed to the intake hole 22, the coil spring 28 is penetrated on the intake hole 22, and the top end part of the coil spring 28 is projected from the surface of a valve seat plate 15 toward a cylinder 12 side by a constant rate. When the intake hole 22 is closed by the intake reed valve 24 in association with that a piston is faced to a top dead point in a cylinder 12, cover part 24a abuts on the top end part of the coil spring 28, the coil spring 28 is contracted, and it is sit on the valve seat plate 15. It is thus possible to alleviate shock caused when the intake reed valve 24 collides with the valve seat plate 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor used in a refrigerator or the like, and more particularly to an improved valve device in a reciprocating refrigerant compressor.

[0002]

2. Description of the Related Art A conventional reciprocating type refrigerant compressor is disclosed in, for example, Japanese Patent Laid-Open No. 5-149256. In this compressor, a compression element that sucks and compresses a refrigerant from an external refrigerant circuit and an electric element that drives a piston thereof are housed in a closed container. The compression element is constructed by mounting a valve seat plate having suction holes and discharge holes at the end of the cylinder and further mounting a cylinder head. A suction reed valve is provided on the cylinder side of the valve seat plate, and a discharge reed valve is provided on the opposite side. The suction reed valve and the discharge reed valve open and close the openings of the suction hole and the discharge hole of the valve seat plate, respectively, according to the reciprocating movement of the piston in the cylinder. The suction reed valve is formed by providing a reed valve-shaped slit on a valve plate made of a thin metal plate.

A passage pipe communicating with the suction muffler is arranged so that its opening faces the suction hole of the valve seat plate. The refrigerant from the external refrigeration circuit is sucked through the suction pipe provided in the closed container and then introduced into the cylinder through the suction muffler, the passage pipe, and the suction hole.

[0004]

In the above-described refrigerant compressor, since the valve seat plate and the suction reed valve are both made of metal, the suction reed valve collides with the valve seat plate during operation and an impact noise is generated. However, there is a problem that a high frequency sound is emitted from the refrigerant compressor.

As a solution to this problem, for example, as disclosed in Japanese Patent Publication No. 54-85 (F16K15 / 16), a reed valve provided with an upwardly curved tongue piece and a downwardly curved tongue piece. Is known. This reed valve absorbs the impact when it collides with the valve seat plate by the buffering action of the tongue piece and suppresses the impact noise. However, since the reed valve itself is provided with a tongue piece for providing a cushioning function, the shape of the reed valve becomes complicated and a manufacturing process for forming the reed valve is required.

Therefore, the present invention does not improve the suction reed valve itself, but uses a conventional flat plate-shaped suction reed valve.
An object of the present invention is to provide a refrigerant compressor having a cushioning function for mitigating an impact on a valve seat plate of an intake reed valve without making a great improvement.

[0007]

DISCLOSURE OF THE INVENTION The present invention is provided in an airtight container having an electric element provided in the airtight container and a cylinder in which a piston driven by the electric element to reciprocate is arranged. A compression element, a valve seat plate having a suction hole formed at the end of the cylinder, a suction reed valve disposed between the end of the cylinder and the valve seat plate to open and close the suction hole, and a suction of the valve seat plate. In a refrigerant compressor provided with a passage pipe having an end opening facing the hole and communicating with the suction muffler, a coil spring inserted into the suction hole of the valve seat plate is provided at the opening of the passage pipe.

The coil spring provided at the opening of the passage tube is
The suction reed valve absorbs shock when closing the suction hole of the valve seat plate.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a refrigerant compressor according to the present invention, and FIG. 2 is a plan view with its upper container removed. In the figure,
Reference numeral 1 denotes a closed container composed of an upper container 1A and a lower container 1B, and frame bodies 2 and 3 composed of two parts, and this frame body 2,
A compression element 4 arranged on the upper side of 3 and an electric element 5 arranged on the lower side are housed. The compression element 4 and the electric element 5 are elastically attached to the inner wall of the closed container 1 via a support device 6.

The electric element 5 includes a stator 8 having a winding 7 wound therein, and a rotor 9 arranged inside the stator 8.
The rotor 9 is attached to the center of the rotor 9 and is constituted by a rotary shaft 11 rotatably supported by a bearing 10 of the frame body 2.

The compression element 4 includes a cylinder 12 and a rotary shaft 11.
The piston 14 reciprocates in the cylinder 12 by the eccentric rotation of the crank pin 13, the valve seat plate 15 made of sintered metal provided on the end surface of the cylinder 12, and the piston 14 is attached to the cylinder 12 via the valve seat plate 15. And a cylinder head 16 that is formed. The cylinder head 16 has a passage pipe 18 communicating with a suction muffler 17, and a discharge muffler 1.
9 are provided. Intake muffler 17 and discharge muffler 19
Are respectively connected to the suction pipe 20 and the discharge pipe 21, and the compressor R12, R1 through the suction pipe 20 and the discharge pipe 21.
It is connected in a refrigeration cycle in which a refrigerant such as 34a is circulated.

FIG. 3 is a cross-sectional view of an essential part showing a valve device formed at the end of the cylinder 12. The valve seat plate 15 has a suction hole 2
2 and a discharge hole 23 are formed, and a suction reed valve 24 and a discharge reed valve 25 for opening and closing the respective openings are provided. The suction reed valve 24 and the discharge reed valve 25 are configured by forming a thin metal plate having the same size as the outer shape of the valve seat plate 15 into a tongue shape by slits. At the end portion of the cylinder 12, the intake reed valve 24, the valve seat plate 15, the discharge reed valve 25, and the cylinder head 27 are attached in order by bolts.

The cylinder head 27 is provided with an insertion hole through which the end of the passage tube 18 is inserted at a position corresponding to the suction hole 22. A coil spring 28 extending from the opening 18a is appropriately fixed and provided in the opening 18a at the end of the passage tube 18. The end of the passage pipe 18 is arranged so that its opening 18a faces the suction hole 22, the coil spring 28 is inserted into the suction hole 22, and the tip of the coil spring 28 moves toward the cylinder 12 from the surface of the valve seat plate 15. It projects about 1 to 0.2 mm.

During the compression stroke of the compression element 4, that is, when the suction reed valve 24 closes the suction hole 22 as the piston 14 moves toward the top dead center in the cylinder 12, the suction hole 2
The lid portion 24a that closes the opening 2 first comes into contact with the tip end portion of the coil spring 28, and the coil spring 28 contracts and seats on the valve seat plate 15. Due to the elastic force of the coil spring 28, the suction reed valve 2
The impact when 4 collides with the valve seat plate 15 is mitigated, and the generation of impact noise is suppressed.

Further, when the lid portion 24a of the suction reed valve 24 is in contact with the coil spring 28, elastic force is received from the coil spring 28, so that the valve seat plate 15 of the suction reed valve 24 is received.
To prevent oil from sticking to the suction reed valve 24
Delay of opening can be prevented.

[0017]

As described above, according to the present invention, since the coil spring is provided at the opening of the passage pipe facing the suction hole of the valve seat plate and communicating with the suction muffler, the coil spring is inserted into the suction hole.
When the suction reed valve closes the suction hole, the impact that collides with the valve seat plate can be alleviated, and the impact noise generated at that time can be reduced.
As a result, a refrigerant compressor in which generation of high-frequency noise that has been generated in the conventional refrigerant compressor is reduced is realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a refrigerant compressor of the present invention.

FIG. 2 is a plan view showing a refrigerant compressor of the present invention.

FIG. 3 is a cross-sectional view of a main part of the refrigerant compressor of the present invention.

[Explanation of symbols]

 1 Airtight Container 4 Compression Element 5 Electric Element 12 Cylinder 14 Piston 15 Valve Seat Plate 17 Intake Muffler 18 Passage Pipe 22 Intake Hole 24 Intake Reed Valve 28 Coil Spring

Claims (1)

[Claims] 1. A compression element provided in the airtight container, having a cylinder in which an electric element provided in the airtight container and a piston driven by the electric element to reciprocate are arranged, and a suction hole. A valve seat plate formed and attached to the end of the cylinder; an intake reed valve disposed between the end of the cylinder and the valve seat plate to open and close the intake hole; and a suction hole of the valve seat plate. A refrigerant compressor provided with a passage pipe having end openings facing each other and communicating with an intake muffler, characterized in that a coil spring inserted into an intake hole of the valve seat plate is provided at the opening of the passage pipe. Machine.