WO2021077186A1

WO2021077186A1 - Connection system applied to hermetic compressor

Info

Publication number: WO2021077186A1
Application number: PCT/BR2020/050427
Authority: WO
Inventors: Rinaldo Puff; Rodrigo Kremer
Original assignee: Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda.
Priority date: 2019-10-21
Filing date: 2020-10-20
Publication date: 2021-04-29
Also published as: BR102019022087A2

Abstract

The present invention relates to a connection system for a hermetic compressor of the type that comprises a suction acoustic filter, the connection system being provided between the compressor suction port and the inlet of the suction acoustic filter. The connection system comprises at least one suction connector (1) that has a substantially frustoconical shape and that is provided with a passage channel (2) and a transition region (5) for connecting the passage channel (2) and the outside of the suction connector (1). The suction connector (1), which has a spiral-shaped cross section, is capable of creating an acoustic mode that significantly reduces the level of pulsation.

Description

"CONNECTION SYSTEM APPLIED TO HERMETIC COMPRESSOR"

Field of the Invention

[0001] The present invention relates to a connection system applied to a hermetic compressor of the type comprising an acoustic suction filter and a suction dowel; the connection system most precisely used in the communication of refrigerant fluid between the outlet of the dowel and the intake of the suction filter; the connection system comprising at least one suction connector provided with a passage channel and a transition region capable of creating an acoustic mode that significantly reduces the level of pulsation of suction transmitted to the cavity and the refrigerator through the line refrigerant suction system.

Fundamentals of the Invention

[0002] As is well known by those skilled in the art, hermetic compressors comprise electromechanical devices capable of compressing a refrigerant fluid by means of successive alteration of the internal volume of a compressor chamber, these equipment being mainly applied in refrigeration systems.

[0003] Generally speaking, the compressor comprises an airtight housing equipped, among other elements, with a suction duct that roughly defines a duct that supplies low temperature refrigerant to the acoustic suction filter, also called suction or muffler.

[0004] According to the current state of the art, the communication of refrigerant fluid between the suction passer and the acoustic suction filter can be direct, semi-direct or indirect. Direct communication comprises the use of a system connector with a connector element, preferably made of rubber. In the semi-direct communication, there is no use of any suction connector and the muffler suction dowel and gas inlet are linearly aligned. Finally, in indirect communication, the coolant inlet from the muffler is not aligned with the suction tube.

[0005] When used, the connector increases the suction pulsation that is transmitted to the refrigerator through the suction line and at the same time reduces the transmission of acoustic energy to the compressor cavity (region with refrigerant gas contained between the mechanical kit and the housing). However, the suction connector's purpose is to direct the refrigerant fluid entirely into the muffler. The equalization of the internal pressure of the muffler with the internal pressure of the cavity occurs by another element, commonly called an equalizer, which, for example, can be defined by a hole in the body of said muffler.

[0006] Furthermore, and as mentioned above, the suction duct provides coolant fluid at low temperature, however the fluid that remains inside the housing has its temperature elevated due to the contact with components heated by the normal operation of the compressor, it happens that , it is not desired that the heated fluid enter the suction filter, as it leads to a loss of thermodynamic efficiency of the compressor. For this reason, the suction connector also has the function of providing thermal insulation, preventing the heated fluid contained in the cavity from coming into contact with the cooler fluid coming from the refrigerator's suction line.

[0007] As an example of the state of the art, the document JP2009079516 presents a compressor that comprises a duct suction unit with concentric channels so that part of the fluid is directed to the silencer and part of the fluid to the interior of the housing. Formally feral, this document proposes the application of concentric channels, with the external channel allowing gases to escape into the housing, however there is no application of a suction connector between the outlet of the suction duct and the entrance of the suction filter, it can be seen that this proposal is not able to provide adequate thermal insulation to the refrigerant fluid coming from the suction duct, allowing the heated refrigerant fluid located inside the housing to return to the entrance of the acoustic suction filter.

[0008] In turn, the document KR20110098494 presents a compressor with connecting ducts with at least one orifice, this orifice being provided to prevent the return of fluid through the ducts. In general, this document proposes a connector element that allows the radial outlet of fluid (through an orifice), however this proposal does not present a suction connector with a geometric configuration capable of creating an acoustic mode that significantly reduces the level of suction pulsation transmitted to the housing cavity and to the refrigerator through the refrigerant suction line.

[0009] Thus, it is a fact to note that the state of the art fails to provide a connection system between the suction dowel and the acoustic suction filter that is capable of: attenuating the pulsation in the suction line, providing adequate thermal insulation to the fluid from the suction duct, direct part of the fluid from the suction duct to the housing and prevent the return of heated fluid from the housing to the intake of the acoustic suction filter. And it's based on deficiencies noted in the state of the art arising from the present invention.

Objectives of the invention

[0010] Thus, it is a fundamental objective of the invention to reveal a connection system with at least one suction connector which, in turn, is equipped with a transition region, this system being applied in the communication of refrigerant fluid between the suction and the acoustic suction filter of a hermetic compressor.

[0011] Additionally, it is the objective of the present invention to provide a connection system in which the transition region is able to create an acoustic mode that significantly reduces the level of suction pulsation transmitted to the cavity and to the refrigerator through the line refrigerant suction system.

[0012] Furthermore, it is the aim of the present invention to provide a connection system capable of providing adequate thermal insulation to the refrigerant fluid coming from the suction duct, preventing the heated refrigerant fluid located inside the housing from returning to the acoustic filter inlet. suction.

[0013] It is an additional objective of the present invention to provide a connection system capable of attenuating the pulsation in the suction line, also reducing noise from the refrigerator.

[0014] Likewise, the objective of the present invention is to provide a connection system capable of attenuating the pulsation towards the refrigerator through the suction line and also attenuating the acoustic energy transmitted to the compressor cavity.

[0015] Still, the objective of the invention is to provide a connection system that acts as an equalizer for the muffler, without mandatory need for a hole in the muffler body for proper equalization.

[0016] Finally, it is the objective of the present invention to provide a connection system capable of directing part of the fluid from the suction duct to the hermetic housing, also preventing the return of heated refrigerant to the intake of the acoustic suction filter .

Summary of the invention

[0017] All the aforementioned objectives are fully achieved through a connection system applied to a hermetic compressor; the system comprising at least one acoustic suction filter and at least one suction duct; the connection system applied to the refrigerant fluid communication between the suction duct outlet and the acoustic suction filter inlet; the connection system comprising at least one suction connector comprising a trunk-conical shape; the connection system in which the suction connector comprises at least one passage channel and a transition region; the suction connector comprising a spiral-shaped cross section; the transition region connecting the passage channel and the exterior of the suction connector.

[0018] Additionally, the present invention provides for a system in which the transition region has at least one passage opening.

[0019] Still, a system is proposed here in which the transition region has a cross section in the shape of a crown sector.

[0020] Additionally, a system is provided in which the suction connector has an accordion-shaped conical shape. [0021] Also, a system is provided in which the cross section of the passage channel defines a circular sector.

[0022] Furthermore, the present invention proposes a system in which it comprises at least one porous element.

[0023] Finally, the present invention provides a system in which the suction connector is made of flexible material.

Brief description of the figures

[0024] The present invention is detailed in detail based on the figures listed below, which:

[0025] Figure 1 illustrates a perspective view of the suction connector, highlighting the transition region.

[0026] Figure 2 shows a front view of the suction connector, highlighting the passage opening.

[0027] Figure 3 illustrates a sectional view of the suction connector, highlighting the transition region.

[0028] Figure 4 illustrates the preferential flow of refrigerant through the suction connector.

[0029] Figure 5 illustrates the non-preferential flow of refrigerant through the suction connector.

[0030] Figure 6 illustrates the assembly of the assembly comprising the intake of the acoustic suction filter, the suction connector and the outlet of the suction passer.

Detailed Description of the Invention

[0031] In accordance with the objectives of the present invention, it is disclosed that a connection system applied to a hermetic compressor of the type comprising at least one acoustic suction filter and at least one suction duct; the connection system of the present invention being applied in the communication of coolant or working fluid between the suction duct outlet 3 and the acoustic suction filter inlet 4; the connection system comprising at least one connector suction pipe 1 provided with a passage channel 2 with at least one transition region 5 that connects the inside and the outside of the suction connector 1.

[0032] In general, the connection system proposed here aims to provide a type of suction here called quasi-direct, through the use of suction connector element 1. More specifically, the system proposed here aims to attenuate the pulsation in the line of suction, without allowing the mixing of fluid at low temperature from the suction duct with heated fluid inside the housing, having, consequently, excellent thermal performance and excellent acoustic performance.

[0033] To achieve such objectives, the suction connector 1 comprises at least one passage channel 2, preferably arranged on its axial axis, this passage channel 2 communicates with at least one transition region 5, so that, at least part of the working fluid that travels through the passage channel 2 accesses said transition region 5.

[0034] In a preferred embodiment, the passage channel 2 is approximately cylindrical in shape, its cross section defining a circular sector, as can be seen in figure 2.

[0035] When viewing figures 1, 2 and 6, it can be seen that the suction connector 1 comprises an external trunk-conical shape, in particular, a bell-shaped trunk-conical shape, with the largest diameter base positioned in the vicinity of the suction duct outlet 3 and the smaller diameter base positioned in the vicinity of the suction filter inlet 4. In particular, in the example in figure 1, it can be seen that the suction connector 1 is composed of three parts (three trunks of cone), from its base to the apex. The base of the suction connector 1 with the housing wall, next to the outlet of the suction dowel 3; in turn, the apex of the suction connector 1 interfaces with the input of the acoustic suction filter 4. Furthermore, it is a fact to note that the accordion-shaped conical shape of the suction connector 1 generates folding regions between the cone changes that form it.

[0036] In a possible embodiment, the suction connector 1 can comprise an additional passage duct connected to its base and / or its apex.

[0037] When viewing figures 2 and 3, which show a cross-sectional view of the suction connector 1, it can be seen that it comprises a spiral shape, the passage channel 2 being defined in its center and, in one of its edges, the transition region being defined 5.

[0038] It is noted, when viewing figures 2 and 3, that, preferably, the cross section of the suction connector 1 that the passage channel 2 defines a circular sector and the transition region 5 defines a crown arc. This is because the surface of the suction connector 1 has a loop, this surface being revolutionized from a central axis, gradually moving away from this axis, by more than 360 °

[0039] In this way, a transition region 5 is defined, which is limited by an area of overlap of the surface of the suction connector 1, as can be seen. It is clear, therefore, when viewing figure 2, that the transition region 5 is defined by an overlapping region on the surface of the suction connector 1.

[0040] Said transition region 5 communicates with the interior of the suction connector 1, more specifically with the passage channel 2; and communicates with the outside of the suction connector. This is because the transition region 5 has at least one passage opening 6.

[0041] Thus, it remains clear that, part of the fluid that flows through the passage channel 2 will access the transition region 5, being taken to the outside of the suction connector 1 through the passage opening 6. Here it is worth noting that, in a Possible realization, the suction connector 1 has two or more transition regions 5 on its surface.

[0042] Again, with reference to figure 1, it is noted that the opening 6 extends on the side of the suction connector 1. In a preferred embodiment, two or more openings 6 are provided on the side of the suction connector 1.

[0043] Still, as seen in figure 2, it is noted that the transition region 5 has a curvature, a fact that leads to the loss of charge of the refrigerant fluid that travels through it, this helps in the creation of an acoustic mode that reduces in a way the suction pulsation level is significant.

[0044] Here the advantages associated with the constructive proposal for the suction connector 1 of the present invention are evident. Regarding the flow of refrigerant fluid, it is noted, when viewing figures 4 and 5, that the fluid coming from the outlet of the suction duct 3 preferably goes through the passage channel 2 when leaving the outlet of the suction duct 3. At this moment , it should be noted that the outlet of the suction duct 3 preferably constitutes a single duct through which the fluid flows unimpeded, with reduced head loss. Upon entering the passage channel 2, part of the refrigerant fluid tends to access the transition region 5, that is, the fluid flow is divided.

[0045] Such configuration and operation, allows the connection system proposed here create an acoustic mode that significantly reduces the level of pulsation of suction transmitted to the cavity and to the refrigerator through the refrigerant fluid suction line.

[0046] Furthermore, and as reported in the objectives of the invention, the connection system proposed here aims to prevent the heated refrigerant fluid located inside the housing from returning to the intake of the acoustic suction filter 4. This objective is achieved, since the refrigerant fluid that comes from inside the suction connector 1 and exits through the passage opening 6, in part, prevents the heated fluid from returning through this same path, thus isolating the intake of the suction filter 4. In addition, the passage opening 6 it has a reduced dimension that helps to prevent the return of heated fluid from the carcass.

[0047] Additionally, as reported in the objectives, the connection system proposed here capable of attenuating the pulsation in the suction line, also reducing noise from the refrigerator; this objective is achieved with the help of the geometry, as explained here, of the suction connector 1, which has a conical accordion shape, preferably composed of three parts (three cone trunks).

[0048] Still, it is important to mention that the suction connector 1 can be composed of one or several materials, preferably flexible materials, such as rubber and / or polymers.

[0049] In a possible embodiment of the present invention, the suction connector 1 can be applied together with a porous element arranged on the base (near the outlet of the suction duct 3) or at the apex (near the inlet of the suction filter 4 ). [0050] In general, this report makes it clear that the connection system proposed here fulfills the objectives for which it is proposed, being able to provide thermal and acoustic protection to the communication of refrigerant fluid inside the compressor housing.

[0051] It is important to note that the above description has the sole purpose of describing in an exemplary way the particular embodiment of the invention in question. Therefore, it is clear that modifications, variations and constructive combinations of the elements that perform the same function in substantially the same way to achieve the same results, remain within the scope of protection defined by the attached claims.

Claims

1. Connection system applied to a hermetic compressor comprising at least one acoustic suction filter and at least one suction duct; the connection system applied in the communication of refrigerant fluid between the outlet of the suction duct (3) and the entrance of the acoustic suction filter (4); the connection system comprising at least one suction connector (1) which comprises a tapered shape; the connection system characterized by the fact that the suction connector (1) comprises at least one passage channel (2) and a transition region (5); the suction connector (1) comprising a spiral-shaped cross section; the transition region (5) connecting the passage channel (2) and the exterior of the suction connector (1).

2. System, according to claim 1, characterized by the fact that the transition region (5) has at least one passage opening (6).

3. System according to claim 1, characterized by the fact that the transition region (5) has a cross section in the shape of a crown sector.

4. System, according to claim 1, characterized by the fact that the suction connector (1) has an accordion-conical trunk shape.

5. System according to claim 1, characterized by the fact that the cross section of the passage channel (2) defines a circular sector.

6. System according to claim 1, characterized by the fact that it comprises at least one porous element.

7. System, according to claim 1, characterized by the fact that the suction connector (1) is produced in flexible material.