MXPA00005701A - Refrigerating agent compressor with improved valve - Google Patents

Abstract

The invention relates to a refrigerating agent compressor for electrical refrigerating appliances, especially for household refrigerators and deep freezers. Said compressor comprises an inner body, a piston which can move in a cylinder, a first compressor seal, a valve spring, a valve plate provided with a refrigerating agent suction bore and a valve block, the valve plate having two recesses provided on its side oriented towards the valve spring. Said compressor is designed so that two externally projecting parts of the spring are inclined and able to enter said recesses and become blocked inside said recesses, and so that a part of the remaining surface of the valve spring is mounted in a way enabling it to move and in a position closely adjacent to the surface of the valve plate oriented towards the interior of the cylinder, for blocking the suction bore provided in the valve plate. The valve spring only comprises the surface with which it is possible to block the suction bore provided in the valve plate, the two side surfaces which can be blocked in said recesses, as well as a surface held by a compressor seal, in a way to be closely adjacent to the surface of the valve plate which faces the cylinder.

Description

COMPRESSOR OF COOLING WITH IMPROVED VALVE The invention relates to a special design of a compressor for hermetic refrigeration, provided, in particular, for use in connection with household appliances for cooling and / or for deep freezing, in particular that part of the compressor that It comprises of the suction cooling components inside the compressor cylinder. It is well known that the refrigeration compressors used in refrigerating and deep-freezing appliances are standardized products, where the compressor manufacturers are incessantly and persistently dedicated to allow these products to become more and more competitive in general efficiency terms. and costs through constant improvements up to the last detail. One of the most critical components used in these refrigeration compressors, without a doubt, is the check valve of the refrigerant suction, that is, the valve that allows the refrigerant to enter the compression cylinder, and, at the same time, avoids that it flows back to the cylinder. This valve usually has the shape of a tongue valve made of a highly resistant and highly elastic steel, which is also called spring valve in the technical jargon of the form in which the description below generally refers to the spring valve or better to the valve spring. It is generally known that the spring valve is usually comprised of a small and extremely thin special steel plate, which in its central region has a bent tooth which defines the area constituting the correct valve spring, i.e. the movable part in the valve and clears and seals the suction gap provided on the valve plate. This thin plate is retained in its position through the respective pitch gaps in its corners, in which the suitable threaded bolts can be threaded and used to clamp the internal body of the compressor, the valve head, the valve plate, valve spring and seals possibly interposed in a way that the aforementioned structural components can be retained together practically as a single body. It is definitely a technique known to all persons skilled in the art and does not need additional explanations. The problem to be solved is related to the actual application of the valve spring, which is currently used to manufacture very expensive special alloys, which, however, are not specifically required for the manufacture of the entire plate. It is only the movable part of the plate that is comprised of a small tongue or spring as well as its transition zone acting as a hinge, which makes these functional demands that can be effectively fulfilled only by using special alloys of high performance, which are usually very expensive. Therefore, it would undoubtedly be of great advantage to limit the application of these alloys only to the movable spring and the associated transition zone, and, at the same time, to use more profitable materials for the remaining part of the plate, since the remaining is clearly less demanding in terms of performance. According to another known solution, which is effective as, the plate of the spring valve is practically eliminated completely, keeping its tongue movable, that is, the correct spring, where the spring can be connected to the plate of the valve through one or several bolts that are inserted in the respective recesses provided in the valve plate and, at the same time, fix in movable spring. This solution, however, has the disadvantage of involving some additional sequences in the manufacture such as, for example, the realization of gaps and the insertion of the respective rods. Even more, the quite considerable costs of these rods, must be taken into account. It is therefore desirable, and, at the same time, the object of the present invention to propose a compressor for cooling that is provided with a spring valve or a similar device that assures the same function of the aforementioned valve arrangement. at clearly reduced production costs without any change in high efficiency and functionality and which, in addition, is easy to assemble using conventional materials and manufacturing processes according to the present state of technology. The features that characterize the invention are defined in more detail in the appended claims.

According to the invention, this objective is achieved through the technical solutions explained in more detail below in the form of a non-limiting example with reference to the accompanying drawings. Where, Figure 1 is a sectional view of some structural components that are connected to the head of the compressor and Figure 1 is an illustration of the structural components according to the invention mounted to the head of the compressor, Figure 2 is a view of land section of the front side of the valve plate according to the present invention, seen from the cylinder, Figure 3 is a sectional view of the valve plate according to Figure 2 seen throughout the area of section A-A, Figure 4 is a sectional view of the front side of the valve plate according to the present invention provided with the valve spring, seen from the cylinder, Figure 5 is a view section of the valve plate according to the Figure 4, seen along the area of section B-B, Figure 6 is a sectional view of the ground seen only of the valve spring according to Figure 4, and Figure 7 is a sectional view of ground seen from the front side of the valve plate provided with the spring of the valve according to the present invention and partially covered by the seal. The concept which underlines the present invention will be explained in more detail in the following: With reference to the Figures and, in particular to Figures 2 to 7, it will be noted that the usual valve spring has been replaced with a valve spring 2 plus small according to the invention, which differs from the conventional design because it is restricted in its size and no longer extends substantially over the entire surface of the valve plate 3, yet it is held by elements of the same threaded bolts that retain the Valve plate in its seat. To be more precise, the spring of the valve 2 according to the invention is comprised of three different sections, that is to say, a first section 5 serving the seal of the suction gap 12, a second section 6 capable of being blocked against the valve plate in a particular manner described in greater detail below, and a third section 7 which acts as an elastic joint which, in turn, interconnects the two sections 5 and 6, as is apparent in Figure 6.

The second section 6 is provided with two outwardly projecting parts 6a and 6b arranged in opposite relation, preferably on the same axis 6c, in which these outwardly projecting parts 6a and 6b are slightly inclined laterally relative to the plane of the other sections of the spring valve, as apparent from Figure 5. As can be taken, in particular, from Figure 2 and Figure 3, two recesses 3a and 3b are provided on the valve plate 3 on the side facing the cylinder 20, whose inner edges 3c and 3d at least partially are at an acute angle. In this case, the two recesses and the outwardly projecting portions 6a and 6b of the valve spring are designed, dimensioned and arranged in a manner that the spring of the valve 2, according to the present invention, adhere to the valve plate 3 associated. In this way, the two outwardly projecting parts 6a and 6b are bent elastically in order to allow them to be inserted into the recesses 3A and 3B mentioned above and have a firm and stable seat there, in particular when fastening with clamp the parts projecting outwards against the inner edges 3c and 3d, as illustrated schematically in Figure 4, and, in particular, in Figure 5. The first section 5 of the valve spring in that stable position holds by clamp is precisely arranged on the suction gap 12 so that it can close it tightly. That is how, the spring construction of the valve is obtained, which can obviate the waste of the expensive material that is usually required for the manufacture of all the valve plates. This material is provided merely for the parts of the spring valve which are necessary to close the suction gap, to retain the spring valve and for the section 7 which acts as an elastic hinge joint connecting the first section 5 with the second section 6 of the valve spring. In order to clamp the valve spring in a more stable and reliable manner, a seal 13 is preferably provided, in particular according to the illustration shown in Figure 6, which in its middle section has an opening 14 which it uncovers the first spring section of the valve 5 which serves to seal the suction gap 12 and the third connection section 7 which serves as an elastic hinge joint, which still completely covers the two projecting parts outwards 6a and 6b, this, together with the above-described clamping of the outwardly projecting parts 6a and 6b, specifically contribute to an improved stabilization of the entire valve spring in its correct operative position, ie, hermetically recessed in the valve plate. It will be readily appreciated that the description and the foregoing explanations have been merely indicated as a non-limiting example to elucidate the invention and that various alternatives and modifications can be provided without abandoning the scope of protection of the present invention.

Claims (6)

1. CLAIMS 1. An electric compressor for cooling, in particular for domestic appliances for refrigeration and deep freezing, including an outer box, an internal body, a piston that moves inside a cylinder (20), a first seal (13), a valve spring (2), a valve plate (3) provided with a refrigerating suction gap (12) and a valve head, characterized in that the valve plate is provided with two recesses (3A, 3B) on the side facing the spring of the valve, in which the spring of the valve is designed in such a way that two parts projecting outwards laterally (6a, 6b) of the same spring, are inclined and have the capacity of being inserted into the recesses and clamped therein, such that one of the portions of the remaining surface of the valve spring is movably disposed in a hermetically recessed position in the surface of the valve plate facing the inside of the cylinder. An electric compressor for cooling according to claim 1, characterized in that the two outwardly projecting parts and the recesses are arranged so that the spring of the valve in its mutual relationship held by clamp is placed against the recess of the valve. suction (12). An electric compressor for cooling according to any of the preceding Claims, characterized in that the valve spring consists essentially of three different sections, of which, the first section (5) is a sealing surface for closing the suction gap provided on the valve plate, the second section (6) comprises the two projecting parts (6a, 6b) that are clamped within the recesses, and the third section (7) of the valve spring it is located between the first section and the second section and serves so that they are not interconnected with any other section that is substantially provided. An electric compressor for cooling according to Claim 3, characterized in that the first seal (13) is located between the spring of the valve and the valve head, where its center section is provided with an opening (14) that the first section (5) and, at least partially, the third section (7) of the valve spring is uncovered. An electric compressor for cooling according to any of the preceding Claims, characterized in that the spring of the valve is symmetrical and the two recesses (3A and 3B) are located substantially symmetrical with respect to the axis of symmetry of the spring of the valve. 6. An electric compressor for cooling according to any of the preceding Claims, characterized in that the two recesses (3A and 3B) are each provided with at least one inner edge at an acute angle (3c, 3d) and that the outer edges of the projecting parts (6a, 6b) are clamped to the respective inner edge.