JP3078743U - Compressor for hermetic cooling system with improved valve mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compressor provided with a valve mechanism capable of improving the volumetric efficiency of the compressor to improve the efficiency of the whole airtight device and simplifying the manufacturing process. SOLUTION: There is provided a valve plate interposed with flat first and second gaskets for sealing and held between a main body and a compressor tip. Further, a thin plate-shaped suction valve associated with a suction hole provided in the valve plate is provided. The entire suction valve is housed in a groove provided on the surface of the valve plate facing the main body.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates generally to compressors such as those used in household hermetic refrigeration systems and similar equipment, and more particularly to valve mechanisms used in such compressors.

[0002]

[Prior art]

 Numerous administrative regulations, such as the European Union Directive, impose increasingly severe constraints on the efficiency of household appliances. These regulations have become an even more important factor in designing cooling systems. The energy consumption of cooling appliances depends heavily on the efficiency of the entire cooling system. The efficiency of the entire cooling system depends not only on the efficiency of the electric motor that operates the cooling system and the mechanical efficiency of the compressor itself, but also on the volumetric efficiency of the compressor. The valve mechanism of the compressor plays a major role in determining the volumetric efficiency of the compressor.

[0003] It is already well known how to produce sheet or reed suction valves using a process in which steel ribbons are sheared and subsequently machined. By such a method, a valve flush with the valve plate of the compressor can be obtained. The mounting part of the valve is permanently fastened between the valve plate and the cylinder body by at least one flat sealing gasket.

[0004]

[Problems to be solved by the invention]

 However, the fastening method as described above is not effective in cost as compared with the conventional valve mechanism. This is because the high tolerance of the suction valve is required, which results in lower valve reliability and higher manufacturing costs.

[0005] A different method is to produce a suction valve whose installation part has a creased knob, as disclosed, for example, in WO 99/30037. Are known. Here, the edges of the creased knob are installed in corresponding recesses provided in the valve plate. In this case, considerations regarding valve resistance are less important. However, this method requires very precise machining of the compressor body to accommodate the valve installation (except for the knob edge), and wastes the compressor interior. The piston head needs to be machined very precisely to accommodate the main part of the valve so that the volume is minimized.

Therefore, in order to improve the volumetric efficiency of the compressor, and thus to improve the efficiency of the entire hermetic device, and to simplify the manufacturing process, an improved cooling compressor used as described above is used. It is desirable to devise a suction valve mechanism.

[0007]

[Means for Solving the Problems]

 In one aspect of the present invention, a cylinder main body, a compressor tip, a flat first gasket for sealing, and a flat second gasket for sealing are interposed, and Provided is a compressor for a hermetic cooling device, comprising: a valve plate held between the compressor plate and a thin plate-shaped suction valve associated with a suction hole provided in the valve plate. The entire suction valve is substantially housed in a groove provided on a surface of the valve plate facing the cylinder body.

According to another aspect of the present invention, the groove of the valve plate has a main region for accommodating a main portion of the suction valve and at least one separate region having a depth greater than the depth of the main region. Region. This separate area can accommodate the installation portion of the suction valve.

According to a further aspect of the present invention, the suction valve of the compressor does not substantially protrude into the cylinder. Therefore, the volume of the cylinder that can be used is increased, which leads to a possibility of improving the efficiency of the entire compressor.

According to still another aspect of the present invention, the suction valve is a generally T-shaped flat tongue-shaped member, and the tongue-shaped member can seal the suction hole of the valve plate. It has a longitudinally shaped main part with a rounded free end and a lateral mounting part with at least one creased tab.

[0011]

[Embodiment of the invention]

 1 to 6 show a part of the structure of a single-cylinder compressor in a hermetic cooling device. The compressor includes an electric motor (not shown), a cylinder body 10, a cylinder 20 containing a piston 25, a first flat gasket 30 for sealing, a valve plate 40, and a suction valve 50. , A compressor tip 60 and a flat second gasket 70 for sealing.

The sealing first gasket 30 has an upper surface 30A and a lower surface 30B. The shape of the gasket 30 is substantially circular, and its inner diameter is almost equal to the outer diameter of the cylinder 20.

The valve plate 40 has a top surface 40A (or 4A) and a bottom surface 40B (or 4B). The valve plate 40 includes discharge holes 41 and 42 that form a part of a discharge path of the compressor, a suction hole 43, and a groove 44. The groove 44 is recessed in the bottom surface 4B of the valve plate 40, as described in more detail below. Further, the valve plate 40 is provided with four holes 49 for receiving bolts (not shown) for mounting each component of the compressor.

The suction valve 50 in the present embodiment is a flat tongue piece designed to be substantially T-shaped, as best shown in FIG. The suction valve 50 includes a main portion 51 formed in a longitudinal direction, and a mounting portion 54 formed in a lateral direction. The main portion 51 has a narrow portion 52 provided at the center thereof to expose the discharge hole 41, and a free end portion 53 having a round shape capable of sealing the suction hole 43. (See FIG. 5). The mounting portion 54 has two creased knobs 55 and 56 (see FIG. 6).

The compressor tip 60 is attached to the cylinder body 10 by the above-mentioned four bolts passing through the holes 49 of the valve plate 40.

The flat second gasket 70 for sealing has an upper surface 70A and a lower surface 70B. The second gasket 70 has a plurality of openings. These openings include openings 71 corresponding to the suction holes 43 of the valve plate 40 (see FIG. 1). Further, the second gasket 70 provides a suitable seal between the valve plate 40 and the compressor tip 60.

As can be seen from the above description and FIGS. 2 to 6, the groove 44 on the bottom surface 4 B of the valve plate 40 can accommodate the entire suction valve 50. As a result, the suction valve 50 does not substantially protrude into the cylinder 20, and the piston 25 can be raised to a position where the upper surface 25A is substantially the same height as the upper surface 10A of the cylinder body 10. This leads to the possibility of improving the volumetric efficiency of the compressor.

In particular, as best shown in FIGS. 2 and 3, the groove 44 comprises two recesses 45 and 46. These recesses are provided in a shape and arrangement capable of accommodating the creased knobs 55 and 56 of the mounting portion 54 of the suction valve 50 with corresponding calibrated interference (see FIG. 6). Further, as best shown in FIGS. 2 and 4, the groove 44 includes a main recess 47 for accommodating a longitudinally formed main portion 51 of the suction valve 50 (see FIG. 2). The depth P1 (see FIG. 3) of the recesses 45 and 46 is larger than the depth P2 (see FIG. 4) of the main recess 47 in the groove 44. With such a feature, centering of the suction valve 50 is naturally realized, and play between the suction valve 50 and the valve plate 40 can be minimized. As a result, the risk that the cooling gas escapes from around the suction valve 50 can be minimized.

The free end 53 of the suction valve 50 is designed to have a shape and size suitable for completely sealing the suction hole 43 of the valve plate 40 (see FIG. 5). This seal is the only fitting part that requires strictness when assembling the compressor. Therefore, after casting the valve plate 40, only the circular edge surrounding the suction hole 43 need be machined. This simplifies the manufacturing process.

Although the specific embodiments of the present invention have been described in detail, the present invention is not limited in scope to the above-described embodiments, and is not limited to the scope of the appended claims. It will be understood that it includes all modifications and alterations that fall within the scope of God and of expression. That is, the present invention includes a suction valve having a different shape, and a valve plate having a suction hole having a different shape and arrangement.

[0021]

[Effect of the invention]

 According to the present invention, since the entire suction valve of the compressor is housed in the groove on the bottom surface of the valve plate, the suction valve hardly projects into the cylinder. Therefore, the upper surface of the piston can rise to substantially the same height as the upper surface of the cylinder body, so that the capacity efficiency of the compressor can be improved.

The free end of the suction valve is designed in a shape and a size suitable for completely sealing the suction hole of the valve plate. Therefore, after the valve plate is cast, only the circular edge surrounding the suction hole needs to be machined, thus simplifying the manufacturing process.

As described above, the volume efficiency of the compressor can be improved, and the efficiency of the entire hermetic device can be improved. Further, the manufacturing process can be simplified.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a compressor of a hermetic cooling device according to an embodiment of the present invention.

FIG. 2 is a front view of a valve plate and a suction valve of the compressor of FIG.

FIG. 3 is a cross-sectional view of the valve plate shown along line 3-3 in FIG. 2;

FIG. 4 is a cross-sectional view of the valve plate shown along line 4-4 in FIG.

FIG. 5 is a front view of a suction valve arranged on a valve plate of the compressor of FIG. 1;

6 is a cross-sectional view of the valve plate shown along line 6-6 in FIG.

[Explanation of symbols]

 40 valve plate 41, 42 discharge hole 43 suction hole 44 groove 45, 46 recess 47 main recess 50 suction valve 51 main part 53 free end 55, 56 knob

Claims (4)

[Utility model registration claims] 1. A compressor for a hermetic cooling device, comprising: a cylinder body; a compressor tip; a flat first gasket for sealing; and a flat second gasket for sealing. A valve plate interposed and held between the cylinder body and the compressor tip, and a thin plate-shaped suction valve associated with a suction hole provided in the valve plate; A compressor which is substantially entirely housed in a groove provided on a surface of the valve plate facing the cylinder body. 2. The groove portion includes a main region for accommodating a main portion of the suction valve, and at least one other region having a depth greater than a depth of the main region, wherein the another region is the suction region. The compressor according to claim 1, wherein the compressor is capable of receiving a mounting portion of a valve. 3. The compression according to claim 1, further comprising a piston provided in a cylinder of the cylinder body, wherein the piston is lifted to a position where an upper surface thereof is substantially flush with an upper surface of the cylinder body. Machine. 4. The suction valve is a generally T-shaped flat tongue-shaped member, and the tongue-shaped member has a round free end capable of sealing the suction hole of the valve plate. The compressor of claim 1, comprising a longitudinally shaped main portion, and a lateral mounting portion with at least one creased knob.