JPS62218684A - Discharge valve device of enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To reduce compression loss due to the re-expansion of compressed refrigerant gas by providing a thin discharge plate provided with a discharge port between a cylinder and the end plate of discharge side bearing to reduce a top clearance formed by the discharge port. CONSTITUTION:Since a thin steel discharge plate 14 has a discharge port 6 provided between a cylinder 13 and a bearing end plate 4a, a top clearance 10 formed in the discharge port 6 disposed in this discharge plate 14 is rendered very small. Thus, compression loss due to the re-expansion of compressed refrigerant gas is substantially reduced to provide a compressor with high efficiency. Further, a guide section 16 for regulating the degree of bending a discharge valve 7 is formed integrally with the discharge port 6 side portion in the bearing end plate 4a. And the discharge valve 7 is sandwiched between the discharge plate 14 and the bearing end plate 4d and said bearing end plate 4a is fixedly fastened integrally with the cylinder 13 by bolts 9 so that the number of parts is reduced to provide an more economical compressor with high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a discharge valve device for a hermetic rotary compressor constituting a refrigeration cycle.

2. Description of the Related Art Heretofore, as a hermetic rotary compressor of this type, there is one disclosed, for example, in Japanese Utility Model Application Laid-Open No. 59-189968@.

As shown in FIG. 4, this is an electric a
The compressor element 2 was provided with a compressor element 3 driven by the electric element 2, and a discharge valve device 5 was provided on a bearing end plate 4 constituting the compressor element 3.

As shown in FIG. 5, this discharge valve device 5 includes a discharge port 6, a discharge valve 7 that opens and closes this discharge 06, and a valve holder that regulates the degree of bending of this discharge valve 7, as shown in FIG. Board 8
The valve holding plate 8 was fixed to the bearing end plate 4 by hanging from the discharge valve 7 with bolts 9.

Problems to be Solved by the Invention In the conventional configuration, since the discharge port 6 is formed integrally with the bearing end plate 4, the top clearance 10 of the discharge port portion is made small to prevent re-expansion of the compressed refrigerant. In order to reduce the compression loss due to
Alternatively, the thickness of the discharge port 6 must be reduced. However, if the hole diameter of the discharge port 6 is made smaller, the passage resistance of the refrigerant gas will increase, which will conversely cause a problem that the efficiency will deteriorate.

On the other hand, if the thickness of the discharge port 6 is made thinner, a problem will arise in terms of reliability due to insufficient strength. Generally, the bearing end plate 4 equipped with the discharge port 6 has a complicated shape, so an integrally molded product made of sintered metal is mainly used, but the properties of this sintered metal are brittle compared to steel, making it less reliable. Since the thickness of the discharge port 6 cannot be reduced in terms of the thickness, it has not been possible to realize a highly efficient compressor.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a discharge valve device capable of achieving highly efficient closed rotary compression.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides an electrical outlet in a sealed container.
The pressure l driven by the llJ machine element and this electric vJ machine element
A type element is provided to constitute a closed type rotary compressor, and between the cylinder constituting the compression V1 element and the bearing end plate on the discharge side, the cylinder end face is closed and compressed by the compression Iil element. A thin discharge plate having a discharge port for discharging a refrigerant is provided, and a proximal end of a tongue-shaped discharge valve that opens and closes the discharge port by the refrigerant is sandwiched between the bearing end plate and the discharge plate. A guide portion fixed to the bearing end plate with a bolt and regulating the degree of bending of the discharge valve is integrally formed in a portion of the bearing end plate on the discharge port side.

action The effect of this means is as follows.

That is, by using a material with high toughness such as a steel plate for the discharge port, even if the discharge port is made thin, reliability will not be impaired, and the top clearance of the discharge port portion can be reduced.

Thereby, compression loss due to re-expansion of the compressed refrigerant gas can be reduced, and a highly efficient compressor can be realized.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIGS. 1, 2, and 3.

Reference numeral 1 denotes a closed container, in which a motor element 2 and a compressor element 3 are respectively arranged. Said compression! i element 3
These include a piston 12 integrated with the crankshaft 11, a cylindrical cylinder 13 housing the piston 12, and bearing end plates 4a and 4b that close openings at both ends of the cylinder 13.
and a discharge plate 14. These bearing end plates 4a and 4b each form a pair, and the crankshaft 11
It also serves as a bearing support. 15 is a cover that constitutes a refrigerant discharge chamber of the compressor element 3.

Next, the configuration of the discharge valve device 5 will be explained with reference to FIG. In the figure, the discharge port 6 is provided on a discharge plate 14 made of a thin steel plate, and includes a discharge valve 7 that opens and closes the discharge port 6, and a guide portion 16 that regulates the degree of bending of the discharge valve 7. have. The guide portion 16 is integrally formed with a smoothly curved shape at a position overlapping with the discharge valve 7 of the bearing end plate 4a. It is formed of four parts, and these are fixed to the cylinder 13 with bolts 9.

In the above configuration, when the electric motor element 2 is operated, the compression element lA3 is also driven, and the refrigerant is compressed by the piston 12 in the cylinder 13, discharged from the discharge port 6, and flows out from the refrigerant discharge chamber into the inside of the closed container 1. Then, it flows from the discharge pipe to the refrigeration cycle (not shown).

Here, since the discharge plate 14 is made of a thin steel plate, the top clearance 10 formed by the discharge ports 6 disposed on the discharge plate 14 is extremely small. This significantly reduces compression loss due to re-expansion of compressed refrigerant gas, resulting in a highly efficient compressor. Furthermore, the function of the valve holding plate 8 for regulating the degree of bending of the discharge valve 7 shown in the conventional example is achieved by integrally forming a guide portion 16 having a similar function at the discharge port portion of the bearing end plate 4a. This is achieved by forming Further, in the conventional example, the bolts 9 that fix the discharge valve 7 are connected to the discharge valve 7 and the valve holding plate 8.
However, in the present invention, the bearing end plate 4a also serves as a fastening element for fixing the bearing end plate 4a to the cylinder 13, thereby reducing the number of parts.

Effects of the Invention As described above, according to the present invention, by providing an auxiliary discharge plate having a discharge port between the cylinder and the bearing end plate on the discharge side, the top clearance formed by the discharge port can be reduced. It is possible to reduce the compression loss due to re-expansion of the compressed refrigerant gas, and realize a highly efficient compressor.

Furthermore, a guide portion for regulating the degree of bending of the discharge valve is integrally formed in the portion of the bearing end plate on the discharge port side, and
The discharge valve is sandwiched between the discharge plate and the bearing end plate, and the bolts that secure the bearing end plate to the cylinder are used to tighten them in one piece, reducing the number of parts and creating a cheaper and more efficient compressor. can be realized.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part of a discharge valve device for a closed type electric compression coil according to an embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same, Fig. 3 is a perspective view showing the configuration of the same parts, and Fig. 4 is a vertical cross-sectional view showing a conventional example,
FIG. 5 is a sectional view of the main part. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Electric motor element, 3... Compression V1 element, 4a... Bearing end plate, 6... Discharge port, 7...
...Discharge valve, 9...Bolt, 13...Cylinder, 1
4... Discharge plate, 16... Guide department representative Yoshihiro Morimoto Figure 1 Δ-9DL mouth Figure 2 7- Discharge γ - Sai Cj Reto Figure 3

Claims (1)

[Claims] 1. An electric motor element and a compressor element driven by the electric motor element are provided in a closed container to constitute a hermetic rotary compressor, and between a cylinder constituting the compressor element and a bearing end plate on the discharge side. A thin plate discharge plate is provided to close the cylinder end face and include a discharge port for discharging the refrigerant compressed by the compressor element. , a guide portion that is sandwiched between the bearing end plate and the discharge plate and fixed to the cylinder with bolts to regulate the degree of bending of the discharge valve is integrally formed in a portion of the bearing end plate on the discharge port side. A discharge valve device for a closed rotary compressor, characterized in that: