Suction acoustic filter for compressor

Abstract

The present invention relates to the technological field of compressors and components and/or devices for compressors. Problem to be solved: The current state of the art includes cooling system of dual evaporation and/or dual suction. On the solutions already existing, the selection of one among the two evaporation/suction lines is done by high complexity constructive mechanisms. Problem resolution: The invention in question aims to simplify the construction of a selection mean of one among two evaporation/suction lines. For so, is revealed a suction acoustic filter for reciprocating compressor which integrates an automatic valve coupled to the inlet way of the suction acoustic filter and a valve of a way is coupled to the inlet way of the suction acoustic filter, being said automatic valve and said valve of a way acting selectively reciprocating, where the valve opening of a way ends up opening the automatic valve.

Claims

1. Suction acoustic filter for reciprocating compressor, the suction acoustic filter comprising: at least a first inlet way and a second inlet way, at least one outlet way and at least one main chamber disposed between the two first and second inlet ways and the outlet way; wherein the main chamber comprises an acoustic attenuation volume which is common to the two first and second inlet ways and to the at least one outlet way; characterized by comprising: at least one automatic valve cooperatively disposed to the first inlet way of the suction acoustic filter; at least one one-way valve cooperatively disposed to the second inlet way of the suction acoustic filter; and wherein said automatic valve and said one-way valve are actuated in a selectively alternated manner, in which an opening of the one-way valve defines a closure of the automatic valve, and in which a closure of the one-way valve defines an opening of the automatic valve.

2. Filter, according to claim 1, characterized by the fact that the one-way valve comprises a two position valve for two ways.

3. Filter, according to claim 1, characterized by the fact that the one-way valve is defined by a valve commanded by a solenoid.

4. Filter, according to claim 1, characterized by the fact that the automatic valve is defined by a check valve.

5. Filter, according to claim 1, characterized by the fact that the automatic valve is defined by a pressure differential valve.

6. Filter, according to claim 1, characterized by the fact that the automatic valve is defined by a plate valve, and is normally open at rest.

7. Filter, according to claim 5, characterized by the fact that the suction acoustic filter further comprises at least one path stopper disposed inside the main chamber to cooperate with at least one of the automatic valve or the one-way valve.

8. Filter, according to claim 1, characterized by the fact that the automatic valve is housed on a bottom portion of the suction filter.

9. Filter, according to claim 1, characterized by the fact that the suction acoustic filter further comprises at least one mounting structure disposed inside the main chamber, in which the at least one mounting structure is adapted to allow the assembly thereon of at least one of the two valves.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The acoustic filter suction to reciprocating compressor now revealed becomes detailed detail based on the figures listed below, including:

(2) FIG. 1 illustrates in schematic section, a first constructive option preferred of the subject invention object;

(3) FIG. 2 illustrates in schematic section, a second constructive option preferred of the subject invention object; and

(4) FIG. 3 illustrates in schematic section, a third preferred constructive option of the subject invention object.

DETAILED DESCRIPTION OF THE INVENTION

(5) According to the mentioned FIGS. 1, 2 and 3, it is found that the acoustic filter suction to reciprocating compressor comprises, broadly, a body (preferably bipartite) whose inner volume is designed to minimize the pulsations suction usually observed in reciprocating compressors used in refrigeration systems. By way of information, as is knowledge of the skilled technicians in the matter, suction filters are preferably compounds in polymer alloy, and so does the suction filter described herein.

(6) According to the present invention, it is noted that the suction acoustic filter described herein comprises a first inlet way 11, a second input track 12 and output track 2. The terms input and output refers only to the fluid dynamics observed in an acoustic filter suction, which in this case provides for the evaporation gas inlet/suction through the channels 11 and 12, and the outlet of the evaporation gas/suction to the engine compression of the reciprocating compressor, via 2.

(7) As usual, it is expected also a main chamber 1 disposed between the input channels and the output via the acoustic filter. It is exactly in said main chamber 1 which is the attenuation of the suction pulses, and this effect already notoriously described in related technical literature.

(8) In accordance with the subject invention, the flow of fluids that can enter the chamber 1 through the first inlet way 11 is controlled by an automatic valve 3 (previously known valves which open and close automatically when pressure conditions allow, for example, ball valves, check valves, plate valves, among others), while the flow of fluids that can enter the chamber 1 through the second path input 12 is controlled by a one-way valve 4 (valve ON/OFF). In this context, it remains clear that both valves 3 and 4 may comprise essentially conventional and commercially available valves, known by technicians skilled in the art.

(9) In the first constructive option of the acoustic filter suction to reciprocating compressor, as shown in FIG. 1, the first inlet means 11 comprises an automatic valve 3 for retention of the spherical type, and the second inlet means 12 comprises a valve a 4 via the electric type, actionable via solenoid command. In this context, and considering the constructive option illustrated in FIG. 1, it remains to emphasize that the automatic valve 3 for retention of the spherical type, could be replaced by an automatic check plate valve type.

(10) In the second constructive option of the acoustic filter suction to reciprocating compressor, as shown in FIG. 2, the first input means 11 comprises an automatic valve 3 preferably open holding plate type in its quiescent state (no forces acting) and second inlet means 12 comprises a one-way valve 4 of the metallic type, actionable through solenoid control 41.

(11) In the constructive possibilities of the acoustic filter illustrated suction in FIGS. 1 and 2 shows that the valves are mounted closely together or juxtaposed with their respective input channels, in which case, the fluid inlet interacts with such valves without first occurs necessarily eases intrinsic pulsations to compressor operation.

(12) In the third constructive possibility suction acoustic filter for reciprocating compressor, as shown in FIG. 3, it is noted, moreover, that the valves are mounted distally of their respective input channels. Therefore, the acoustic filter suction to reciprocating compressor comprises, inside your camera 1, a mounting frame 14 dedicated to the assembly of valves 3 and/or 4. The valves 3 and 4 of this third constructive possibility are similar to valves second constructive option, i.e. the automatic valve 3 is withholding kind plate and preferably open in its resting state (not acting forces) and the one-way valve 4 is of the metallic type, actionable through solenoid control 41.

(13) Still on the constructive possibilities illustrated in FIGS. 2 and 3, it is noted that the automatic valve 3 and/or one-way valve 4 can be of the normally-open and/or the type normal-closed, and, regardless of this constructive detail, it is essential that such valves allow a unique fluid flow. The example of FIG. 3, where both valves are normally-open, the fluid inlet for the second input path 12 must be able to close the automatic valve 3 for retention and, on the other hand, the controlled closure one way valve 4 through the solenoid actuator 41 must be able to allow the maintenance of opening the automatic valve 3 for retention and, accordingly, the fluid inlet through the first inlet 11. Also in relation to the possibilities construction illustrated in FIGS. 2 and 3, it is seen that preferably at least one of the two valves 3 and 4 cooperates with an end-of-travel stop 5 strategically arranged within the chamber 1 the acoustic filter suction compressor alternative. That end-of-travel stop 5 aims to limit the opening stroke of their respective valve.

(14) In general, the third constructive option of the acoustic filter suction to reciprocating compressor, as shown in FIG. 3, differs from the second constructive option of acoustic suction filter reciprocating compressor, as shown in FIG. 2, by the fact that the mounting frame 14, and allows the valves to be physically disconnected from entryways, has yet to be defined two new independent chambers beyond that common to two lines of pressure and, in addition, makes it possible to use a single stop end-to 5-course for both valves. This configuration aims to reduce the residual volume of fluid in common chamber, allowing the system to operate at higher switching frequencies for the reasons explained on patent PCT/BR2011/000120 and BR1020140072543.

(15) The outputs of both valves 3 and 4 are directed to the camera 1, which comprises, by definition, a common volume, and intermediate between the two valves 3 and 4 and the outflow two of said acoustic filter suction.

(16) The functional logic of the suction acoustic filter for reciprocating compressor disclosed herein is simple: the differential pressure existing inside the chamber 1 determines which of the valves is in an active operational state. Therefore, it is necessary that the inlet means of the pressure 12 is always larger than the input via the pressure 11, so that simple operation (change of operational status) of a track 4 the valve is sufficient to switch between fluid communication via inlet 11 and outlet of two or fluid communication via the inlet 12 and the outlet pathway 2.

(17) Thus, it is noted that the functional principle of suction acoustic filter reciprocating compressor disclosed herein is similar to the functional principle of selection of the fluid cooling system described in document U.S. Pat. No. 5,531,078 patenting. In fact, this is exactly the intention of the invention in question, with further optimize aspects for improvement also exist in the cooling system described in patenting document U.S. Pat. No. 5,531,078.

(18) Accordingly, it is the great merit of the subject invention using an acoustic filter suction necessary and usually existing on piston compressors, which, provided with two cooperating operating valves solve the assembly problems and lubricant oil return existing in this document patenting U.S. Pat. No. 5,531,078.

(19) While in Patent document U.S. Pat. No. 5,531,078 a one-way valve is external and the check valve is directly mounted on the pipe where circulates the flow of fluid at high pressure, in the invention in question, both valves are mounted so safe, practical and reliable, even in a modeling element whose characteristics are used to facilitate any type of assembly and mechanical connection.

(20) While in Patent document U.S. Pat. No. 5,531,078 the two suction lines are airtight, culminating in the great lubricant oil return problem (widely known problem for the skilled in the art), the subject invention only one of the evaporation/suction lines needs to be tight, while the other suction line/evaporation can be equalized to the internal pressure of the compressor housing within which the suction acoustic filter is disposed. The evaporation/hermetic suction line (high pressure) is connected to the inlet way 12 of the filter, while the input means 11 is equalized with pressure inside the compressor housing (not shown), a pressure that corresponds to the line evaporation/equalized suction.

(21) Furthermore, the valve 3 is accommodated preferably in the lower suction filter region so that the oil may eventually be housed inside said suction filter during compressor operation to be easily purged to the compressor housing when the valve 3 is open. In fact, a valve normally-open to the input means 11 is preferred to allow the suction oil filter purging during the period that the compressor is switched off.

(22) Having described the preferred embodiment of the invention in question, it remains evident that the scope of protection required is not limited to the illustrative figure, but on the set of claims and the possible equivalent means.