MXPA96003901A - Compressor of the hermetically sell type - Google Patents

Abstract

The present invention relates to a hermetically sealed compressor characterized in that it comprises: a motor unit placed centrally of a hermetically sealed box, a compressor unit located in the hermetically sealed box and having a cylinder and a piston the cylinder is in coupling with the piston driven by the electric motor unit to move reciprocally: a valve seat plate equipped with a plurality of suction holes adjacent to the partition disposed therebetween and attached to the end portion of the cylinder; Suction tab disposed between the end portion of the cylinder and the valve seat plate for opening and closing the plurality of suction holes, wherein the valve seat plate is constructed in such a way that the division between the holes of the valve Adjacent suction has a constant thickness in a direction that separates the orifici

Description

COMPRESSOR OF THE HERMETICALLY SEALED TYPE FIELD OF THE INVENTION The present invention relates to a compressor of the hermetically sealed type for use in refrigerators or similar apparatuses / and more particularly to a compressor of the reciprocating type, which includes a valve seat plate, which has formed a plurality of suction holes, provided to close an end portion of an indro cylinder.

BACKGROUND OF THE INVENTION Compressors of the reciprocating type are configured in such a way that a piston, driven by an electric motor, moves with reciprocating movement inside a cylinder, to suck, compress and discharge refrigerant, which consequently circulates in a cycle of refrigeration. The suction and the discharge of the refrigerant, to and from the cylinder, are achieved through a hole of REF: 23103 suction and a discharge hole made in a valve seat plate, attached to an end portion of the cylinder. The suction and discharge holes acquire open and closed states by means of a tongue, suction valve, and a tongue valve, discharge, attached to the valve seat plate in response to the pressure variation due to the alternative movements of the piston inside the cylinder. The suction resistance becomes smaller with a larger dimension of the suction hole made in the valve seat plate, with the result that the coolant can be sucked into the cylinder with high efficiency. Particularly, in a case where a substitute refrigerant is used, of Flon, such as R134a, taking into account the recent problem of the regulation of Flon, since its evaporation temperature (around -26 ° C) is greater than that of the conventional Flon refrigerant, R12 (-30 ° C to -40 ° C) to cause the cooling capacity to lower, has been necessary more and more, a refrigerating machine, which can solve the problem of the cooling capacity, increasing the flow of refrigerant circulating in the refrigeration cycle. However, the increase in the size of the suction hole consequently increases the size of the tongue valve, by suction, opening and closing its opening in such a way that it is difficult to place it in a limited space. In addition, the effort that must be applied to the suction tab valve increases during the opening and closing operations and hence the suction tab valve can be broken. In order to eliminate this problem, as exemplified by the Japanese Utility Model Application, examined and published, No. 53-32332, a compressor of the hermetically sealed type in which a plurality of suction holes is made, has been known. the longitudinal directions of a tongue valve, suction. The formation of the plurality of suction holes in the valve seat plate can reduce the suction resistance overall, while restricting the size of each suction hole to eliminate the possibility of an uplift. t ur a.

However, when the plurality of suction holes are made in the valve seat plate, with a given dimension, the suction holes have to be placed close to each other. If the plurality of circular suction holes are formed in such a way that one is close to the other, the dividing sections between the suction holes, present along straight lines passing through the centers of the respective circles , they reach a minimum dimension in such a way that they can break due to the opening and closing movements of the tongue valve, of suction. Particularly, in a case where the valve seat plate is made of a sintered metal, sufficient strength of the partition sections is necessary. further, in the case of a compressor of the hermetically sealed type, of small size, so that the arrangement of a plurality of suction holes in the valve seat plate, of limited dimension, contributes to a desired amount of gas suction , difficulty is experienced in widening or enlarging the separation (width of the dividing sections) between the suction holes. Further, in the hermetically sealed type compressor provided with a valve seat plate having a plurality of suction holes formed, the suction resistance needs to decrease to increase the internal dimension of a conduit leading to the gas refrigerant from a muffler of suction towards the suction holes. However, increasing the internal dimension of the conduit puts a limit on its placement. For example, in the case of using a valve seat plate with two suction holes, as illustrated in Figure 10, which is a cross-sectional view of a main section about an end portion of the cylinder, the inner dimension of a passage tube 18 to be inserted into a passage hole 35 made in a head 16 of the cylinder, is smaller than that of the area of the two suction holes 24, 25 made in the support of the plate 15 of the seat of a valve, and the passage tube 18 is required to be positioned in such a way that the center of its opening is placed in the near portion (a partition 50) of the two suction holes 24, 25, to allow that the opening extends above the plurality of suction holes 24, 25. This construction results in a high resistance to suction.

BRIEF DESCRIPTION OF THE INVENTION Therefore, an object of the present invention is to provide a compressor of the hermetically sealed type which is capable of eliminating the aforementioned problems. According to the present invention, in a compressor of the hermetically sealed type comprising an electric motor unit placed inside a hermetically sealed envelope, a compressor unit located inside the hermetically sealed envelope and having a cylinder that engages with a piston driven by the electric motor unit, for reciprocating movement, a valve seat plate equipped with a plurality of adjacent suction holes and attached to an end portion of the cylinder, and a suction tongue valve, placed between the end portion of the cylinder and the valve seat plate, to open and close the plurality of suction holes, the valve seat plate is constructed such that the divisions between the adjacent suction holes have a dimension constant (width). The formation of the divisions with a constant dimension between the plurality of suction holes can ensure a desired strength of the dividing sections. Additionally, in accordance with this invention, in a compressor of the hermetically sealed type comprising an electric motor unit placed within a hermetically sealed envelope, a compressor unit located within the hermetically sealed envelope and having a cylinder that enters in coupling with a piston driven by the electric motor unit, for reciprocating or reciprocating movement, a valve seat plate equipped with a plurality of adjacent suction holes and attached to an end portion of the cylinder, a valve tongue, suction, placed between the end portion of the cylinder and the valve seat plate, to open and close the plurality of suction holes, and a cylinder head attached to the valve seat plate and having a through hole that accommodates a passage tube that communicates with a suction muffler and that is provided aligned with the plural In the case of suction holes, the valve seat plate is equipped with a low pressure room or space communicating with the plurality of suction holes. The formation of the low pressure space can reduce the resistance of the suction between the opening of the passage tube and the openings of the suction holes. Further, in accordance with this invention, in a compressor of the hermetically sealed type comprising an electric motor unit placed inside a hermetically sealed envelope, a compressor unit placed inside the hermetically sealed envelope and having a cylinder that engages with a piston driven by the electric motor unit for reciprocating movement, a valve seat plate equipped with a plurality of adjacent suction holes and attached to an end portion of the cylinder, a tongue valve, suction valve , positioned between the end portion of the cylinder and the valve seat plate, for opening and closing the plurality of suction holes, and a cylinder head attached to the valve seat plate and having a through hole that accommodates or houses a passage tube which communicates with a suction muffler and which is provided to align with the plurality of suction holes, the valve seat plate is constructed such that the divisions between the adjacent suction holes have a constant dimension, and is equipped with a low pressure space communicating with the plurality of suction holes. The low pressure space is developed with a cavity or recess formed in the valve seat plate, and the plurality of suction holes are in the cavity. In addition, the low pressure space is created with a slot made in the valve seat plate and establishes a communication between the plurality of the holes of its valve.

BRIEF DESCRIPTION OF THE DRAWINGS The object and features of the present invention will become more readily apparent from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 is a side view, in cross section, showing a compressor of the hermetically sealed type, in accordance with this invention; Figure 2 is a plan view, showing a compressor of the hermetically sealed type, in accordance with this invention; Figure 3 is a plan view, showing the seat plate of a valve of a compressor of the hermetically sealed type, in accordance with this invention; Figure 4 is a plan view showing the plate of the seat of a valve, of a compressor of the hermetically sealed type, of f or nity with this invention; Figure 5 is a plan view showing a suction tab valve of a hermetically sealed type compressor in accordance with this invention; Figure 6 is a cross-sectional view showing a main section around an end portion of a compressor cylinder of the hermetically sealed type, in accordance with this invention; Figure 7 is an illustration of suction holes of a compressor of the hermetically sealed type, in accordance with this invention; Figure 8 is a plan view showing the seat plate of a valve of a compressor of hermetically sealed type, in accordance with this invention; Figure 9 is a graphic illustration available for proprietary comparison between a compressor of the hermetically sealed type in accordance with this invention and a compressor of the above hermetically sealed type; Y Figure 10 is a cross-sectional view showing a main section around an end of a cylinder of a compressor of the hermetically sealed type, above.

DETAILED DESCRIPTION OF THE MODALITIES PREFERRED Referring now to the drawings, a description of an embodiment of the present invention will be made subsequently. Figure 1 is a side view, in cross section, showing a compressor of the hermetically sealed type, in accordance with this invention, and Figure 2 is a plan view showing the same compressor from which the upper side wrapping is removed . In the illustrations, the reference number 1 designates a hermetically sealed envelope, composed of a jacket 1A on the upper side and a shell IB on the lower side, which accommodates or accommodates two structures or frames 2, 3, a compressor unit 4 located above or above the structures 2, 3, and an electric motor unit 5 located below the structures 2, 3,. The unit 4 of the compressor and the electric motor unit 5 are connected, via a support unit 6, to the inner wall of a sealed casing 1, which is sealed. The electric motor unit 5 comprises a stator 8 having in it a winding or winding 7, a rotor 9 placed inside the stator 8, and a rotating shaft 11 mounted in the central section of the rotor 9 and which is supported so that it can rotate, with a shaft 10 of the structure 2. The compressor unit 4 comprises a cylinder 12, a piston 14 which moves reciprocatingly or reciprocatingly within the cylinder 12 in response to rotations or eccentric rotations of a stump 13 of crank, made in relation to the rotating shaft 11, a plate 15 of the valve seat - made of a sintered metal and located on an end surface of the cylinder 12, and a cylinder head 16 attached through the seat plate 15 from the valve, to the cylinder 12. The cylinder head 16 is equipped with a passage tube 18 which is in communication with a suction silencer 17, and a discharge silencer 19. The suction muffler 17 and the discharge muffler 19 are communicated with a suction tube 20 and a discharge tube 21, respectively, and the compressor is coupled through suction tube 20 and discharge tube 21, to a refrigeration cycle to circulate a refrigerant such as R12 and R134a. Figures 3 and 4 show a detailed structure of the plate 15 of the valve seat. Of these drawings, Figure 3 is an illustration in plan or from above thereof, seen from the side of the piston, and Figure 4 is a top plan illustration thereof, seen from the side of the cylinder head. . A side surface of the piston of the plate 15 of the valve seat has cavities 22, 23, and in the cavity 22 two suction holes 24, 25 are made, one adjacent to the other, while in the cavity 23 there is made a 26 discharge hole. These suction holes 24, 25, and the discharge hole 26 are positioned such that their center lies on a straight line. Between the two suction holes 24, 25, a division 50 having a constant (width) dimension is made to ensure a given resistance. That is, each of the suction holes 24, 25 has a configuration comprising an arc portion and a linear portion 24L or 25L, the linear portions 24L and 25L being in opposite relation to one another. The seats 29, 30, of the valves, which are defined by grooves 27, 28, are provided around the openings of the suction holes 24, 25 and of the discharge hole 26. The openings of the suction holes 24, 25 on the side of the seat 29 of the valve, they are opened and closed by the valve 31 of suction tabs, which are shown in figure 5. The tongue valve 31, suction, is constructed in such a way that it forms a portion 33 notch in the body 32 of a valve, consisting of a thin plate made of metal. Additionally, the suction tab valve 31 has a notched hole 34 which is in alignment with or in correspondence with the discharge hole 2. The body 32 of the valve is superimposed on the lateral surface of the piston of the valve seat plate 15, as illustrated, and, together with the valve seat plate 15 is attached an end surface of cylinder 12. I ntermine, although not illustrated, a discharge tongue valve is located or placed in cavity 23 to open and close the lateral opening of valve seat 30, of the discharge opening, and a valve guard to limit the opening degree of the tongue valve, discharge valve. Figure 6 is a cross-sectional view showing a main section, ie an end section of the cylinder, which more specifically illustrates an assembly comprising the plate 15 of the valve seat, the cylinder head 16 and the passage tube 18 communicating with the suction muffler 17 on the end surface of the cylinder 12. The cylinder head 16 has a through hole 35 in a position corresponding to the suction holes 24, 25 of the plate 15 of the valve seat. An end portion of the passage tube 18 is engaged with the suction muffler 17, and the other end portion thereof is inserted into the passage hole 35. The opening end surface, of the passage tube 18, is substantially positioned on the the surface e to the l of the cylinder, of the plate 15 of the valve seat. The central portion of the opening of the passage tube 18 is positioned such that it is aligned with the central portion of the partition 50 between the suction holes 24, 25 as shown in Figure 7 where the opening is indicated by a dotted line 18A. In a portion of the plate 15 of the valve seat that is in opposite relation to the opening of the passage tube 18, a cavity 22 is formed which defines a low pressure space 36 that establishes a connection between the two holes suction 24, and 25. The refrigerant gas from the suction tube 20 is introduced into the cylinder 12 after passing through the suction muffler 17, the passage tube 18, the low pressure space 36 and the suction holes 24, 25. while the piston 14 lowers or descends inside the cylinder 12. In this case, since the opening of the passage tube 18 is in the confronting relation to the low pressure space 36, the resistance to the succ i-6n becomes more small due to the low pressure space 36 when compared to that of the prior art example shown in Figure 10. Figure 8 shows another example of the valve seat plate 15 which can also reduce the resistance of the suction by forming the low pressure space in the plate 15 of the valve seat. Figure 8 is a top or plan view of the plate 15 of the valve seat seen from the side of the cylinder head 16, where the same parts as those of figure 4 are marked, with the same numbers of reference. The peculiarity is that on the side surface of the cylinder head a slot 37 is formed which establishes a communication between the two suction holes 24, 25, to provide a low pressure space 36 communicating with the two suction holes. 24, 25. The slot 37 has a depth, for example about half the thickness of the plate 15 of the valve seat, which does not reach the lateral surface of the cylinder 12 of the valve seat plate 15, to maintain the resistance of plate 15 of the valve seat. Figure 9 is a graphical view showing experimental results of the cooling capacity and the performance coefficient of the compressor, according to this invention, by way of comparison with an example of the prior art. In Figure 9, the character A indicates the results in the case of using the valve seat plate of the prior art, of figure 10, without low pressure space 36, the character B indicates the results in the case of using the plate 15 of the valve seat, of figure 8, in accordance with this invention, and the character C shows the results in the case of using the plate 15 of the valve seat, of figure 4 in accordance with this invention. In the plate 15 of the valve seat, in accordance with this invention, the low pressure space 36 is provided in a location opposite the opening of the passage tube 18, which is in communication with the muffler 17 of the valve. suction, to decrease the resistance to suction, which can improve both the cooling capacity and the performance coefficient. As described above, since in the hermetically sealed compressor, the divisions between the plurality of suction holes in the valve seat plate are made in such a way that they have a constant dimension, without taking into account the formation of the plurality of suction holes in the valve seat plate of limited dimension, which allows a large amount of suction, the resistance of those divisions or separations can be maintained. In addition, since the low pressure space is made in the valve seat plate such that it aligns with the pipe tube coupled to the suction muffler, the suction resistance is reduced by sucking the refrigerant gas. before the cylinder and hence the cooling capacity and the performance coefficient of the hermetically sealed compressor are improved. It should be understood that the above described only refers to preferred embodiments of the present invention and that it is intended to cover all changes and modifications of the embodiments of the invention used herein for the purposes of the description, which do not constitute a deviation of the spirit and scope of the invention.

It is noted that in relation to this date, the best method known by the applicant to carry out the aforementioned invention, is the conventional one for the manufacture of the objects to which the ism refers. Having described the invention as above, the content of the following is claimed as property:

Claims (5)

1. A compressor of the hermetically sealed type, characterized in that it comprises: an electric motor unit placed inside a hermetically sealed envelope; a compressor unit, located inside the hermetically sealed envelope and having a cylinder and a piston, the cylinder is in engagement with the piston and this is driven or driven by the electric motor unit to move alternatively or with swing; a valve seat plate equipped with a plurality of suction holes, adjacent, and attached to an end portion of the cylinder; and a suction tab valve, positioned between the end portion of the cylinder and the valve seat plate, for opening and closing the plurality of suction holes, wherein the valve seat plate is constructed in such a manner that the divisions or separations between the adjacent suction holes have a constant dimension.

2. A compressor of the hermetically sealed type, characterized in that it comprises: an electric motor unit placed inside a hermetically sealed envelope; a compressor unit located inside the hermetically sealed envelope and having a cylinder and a piston, the cylinder is in engagement with the piston and this is driven or driven by the electric motor unit so that it moves reciprocatingly or reciprocatingly; a valve seat plate equipped with a plurality of suction holes, adjacent, and attached to an end portion of the cylinder; a suction tab valve positioned between the end portion of the cylinder and the valve seat plate to open and close the plurality of suction holes; and a cylinder head, attached to the valve seat plate, and having a through hole that accommodates or accommodates one side of the opening of a passage tube that communicates with a suction muffler or suction damper, the hole by way of passage is provided for alignment with the plurality of suction holes, wherein the valve seat plate has a low pressure space communicating with the plurality of the squeezing holes.

3. A compressor of the hermetically arised type because it comprises: an electric motor unit placed inside a hermetically sealed envelope; a compressor unit located inside the hermetically sealed envelope and having a cylinder and a piston, the cylinder is in engagement with the piston, and this is driven or acted upon by the electric motor, so that it moves alternately or with oscillation; a valve seat plate, equipped with a plurality of adjacent suction holes, and attached to an end portion of the cylinder; a suction tab valve positioned between the end portion of the cylinder and the valve seat plate to open and close the plurality of suction holes; and a cylinder head, attached to the valve seat plate and having a through hole that accommodates or accommodates a passage tube that communicates with a suction muffler and that is provided for alignment with the plurality of holes of suction, wherein the valve seat plate is constructed in such a way that the divisions or separations between the adjacent suction wires have a constant mession, and are equipped with a low pressure space communicating with the plurality of suction hole.

4. A compressor of the hermetically sealed type, according to the definition of claim 2 or 3, characterized in that the low pressure space is made or constructed with a cavity formed in the valve seat plate, and the plurality of the holes in the valve seat. suction is made in that cavity.

5. A compressor of the hermetically sealed type, according to the definition of claim 2 or 3, characterized in that the low pressure space is made with a groove constructed in the valve seat plate and which establishes a communication between the plurality of the suction holes.