Crankcase oil separation for high pressure reciprocating compressors

Abstract

An oil separation assembly for use in a high pressure reciprocating compressor is provided. The compressor includes a suction chamber, a crankcase chamber, and at least one partition member at least partially separating the suction chamber and the crankcase chamber. The at least one partition member includes at least one opening. The oil separation assembly can include at least one demisting structure positioned within the crankcase chamber adjacent the at least one partition member at the at least one opening. At least one securing structure can be secured in operable relation with the at least one demisting structure so as to secure the at least one demisting structure relative to the opening. The oil separation assembly can further include a second demisting structure positioned within the suction chamber adjacent the at least one partition member at the at least one opening.

Claims

1. An oil separation assembly for use in a high pressure reciprocating compressor, the compressor comprising a suction chamber, a crankcase chamber, and at least one partition member at least partially separating the suction chamber and the crankcase chamber, the at least one partition member including at least one opening, the oil separation assembly comprising: at least one demisting structure positioned within the crankcase chamber adjacent the at least one partition member at the at least one opening; a second demisting structure positioned within the suction chamber adjacent the at least one partition member at the at least one opening; and at least one securing structure secured in operable relation with the at least one demisting structure so as to secure the at least one demisting structure relative to the opening; wherein the at least one demisting structure and the second demisting structures are independently selected from the group consisting of wire mesh, steel wool, stainless mesh, steel mesh, serpentine channels and combinations thereof.

2. The oil separation assembly of claim 1, wherein at least one of the at least one demisting structure and the second demisting structure are steel wool.

3. The oil separation assembly of claim 2, wherein both the at least one demisting structure and the second demisting structure are steel wool.

4. The oil separation assembly of claim 1, wherein the at least one securing structure comprises a first support, a second support, and a locking structure.

5. A high pressure reciprocating compressor comprising: a suction chamber; a crankcase chamber; a partition member at least partially separating the suction chamber and the crankcase chamber and comprising at least one opening; and at least one oil separation assembly comprising a first demisting structure positioned in the crankcase chamber adjacent the partition member at the at least one opening, a second demisting structure positioned within the suction chamber adjacent the at least one partition member at the at least one opening, and at least one securing structure secured in operable relation with the first demisting structure so as to secure the first demisting structure relative to the opening; wherein the first and second demisting structures are independently selected from the group consisting of wire mesh, steel wool, stainless mesh, steel mesh, serpentine channels and combinations thereof.

6. The compressor of claim 5, wherein at least one of the first and second demisting structures are steel wool.

7. The compressor of claim 5, wherein both the first and second demisting structures are steel wool.

8. The compressor of claim 5, wherein the at least one securing structure comprises a first support, a second support, and a locking structure.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Embodiments of the crankcase oil separation assembly and related methods are disclosed with reference to the accompanying drawings and are for illustrative purposes only. The crankcase oil separation assembly and related methods are not limited in application to the details of construction or the arrangement of the components illustrated in the drawings. The crankcase oil separation assembly and related methods are capable of other embodiments or of being practiced or carried out in other various ways. Like reference numerals are used to indicate like components. In the drawings:

(2) FIG. 1 is a cross-sectional view of an exemplary oil separation assembly in accordance with embodiments of the present disclosure;

(3) FIG. 2 is a perspective view of the exemplary oil separation assembly of FIG. 1;

(4) FIG. 3 is a cross-sectional view of a second embodiment of an exemplary oil separation assembly in accordance with embodiments of the present disclosure;

(5) FIG. 4 is a perspective view of the exemplary oil separation assembly of FIG. 2; and

(6) FIG. 5 is a cross-sectional view of a third embodiment of an exemplary oil separation assembly in accordance with embodiments of the present disclosure.

DETAILED DESCRIPTION

(7) FIG. 1 is a cross-sectional schematic of an oil separation assembly 100 for use in a reciprocating compressor in accordance with embodiments of the present disclosure. As shown in FIG. 1, the reciprocating compressor includes a partition member 10 which separates the suction chamber 20 and the crankcase chamber 30. The partition member 10 includes at least one opening 12 through which oil and refrigerant may flow. To reduce or hinder the flow of oil from the crankcase chamber 30 to the suction chamber 20 through the opening 12, the oil separation assembly 100 is positioned to cover both the suction chamber-side and crankcase chamber-side of the opening 12.

(8) In the embodiment shown, the oil separation assembly 100 includes a suction chamber-side demisting structure 40 and a crankcase chamber-side demisting structure 42. The demisting structures 40, 42 are materials or assemblies, or combinations thereof, used to enhance the removal of liquid droplets of oil from the gaseous refrigerant stream. The demisting structures 40, 42 may be the same structures or different structures.

(9) Nonlimiting examples of suitable demisting structures include materials such as mesh-type coalescers, including wire mesh-type coalescers (e.g., steel wool), mesh-type materials made of natural or synthetic fibers, other similar mesh-like materials, serpentine channels, and steel or stainless mesh. In still further embodiments, one of the demisting structures 40, 42 may be a combination of one or more demisting materials used in combination with one or more demisting structures, such as, for example, serpentine channels packed with a demisting material such as steel wool.

(10) In one embodiment, at least one of the demisting structures 40, 42 is a material having a thickness T.sub.40, T.sub.42. In some embodiment, the thickness of the demisting structures 40, 42, particularly when one or both of the demisting structures is a mesh-type coalescer or other material, may be specifically selected based on the size of the opening 12 and/or the capacity, performance, or other metric of the compressor.

(11) As liquid droplets of oil pass through the demisting structures 40, 42, the liquid droplets coalesce until they are too large and/or heavy to be sustained within the demisting structures 40, 42. The coalesced oil droplets then drop into the crankcase chamber 30 and are collected in the oil sump (not shown).

(12) The first and second demisting structures 40, 42 each have a thickness T.sub.40, T.sub.42. In the embodiment shown in FIG. 1, the thicknesses T.sub.40, T.sub.42 of the demisting structures 40, 42 are unequal. That is, demisting structure 40 has a lesser or smaller thickness T.sub.40 than that of demisting structure 42. However, in other embodiments, the thicknesses T.sub.40, T.sub.42 may be the same, or T.sub.40 may be greater than T.sub.42.

(13) The oil separation assembly 100 further includes at least one securing structure 44 which secures the suction chamber-side demisting structure 40, crankcase chamber-side demisting structure 42 or both in position relative to the opening 12. In other words, the at least one securing structure may be a single component or assembly which is secured in operable relation with the suction chamber-side demisting structure and/or crankcase chamber-side demisting structure so as to secure the demisting structure relative to the opening 12.

(14) For example, in the embodiment shown in FIG. 1, the at least one securing structure 44 is a securing assembly comprising a first support 44a, a second support 44b and a locking structure 44c. More particularly, in the embodiment shown, the at least one securing structure 44 includes a first support 44a which is a plate, a second support 44b which is also a plate, and a locking structure 44c which is a locking stud. In the embodiment illustrated in FIG. 1, the first support 44a is on the suction chamber-side of the oil separation assembly 100 and adjacent the outer surface of the first demising structure 40 so as to sandwich the first demisting structure 40 between the partition member 10 and the first support 44a. Similarly, the second support 44b is on the crankcase chamber-side of the oil separation assembly 100 and adjacent the outer surface of the second demisting structure 42 so as to sandwich the second demisting structure 42 between the partition member 10 and the second support 44b. The second support 44b therefore also serves as a first barrier to prevent or limit large oil droplets from passing through the opening 12. Further, the second support 44b acts as a barrier to prevent large droplets of oil from clogging the demisting structures 40, 42.

(15) The locking stud 44c passes through the first support 44a, first demisting structure 40, the opening 12, the second demisting structure 42 and the second support 44b and, along with washers and lock nuts 44d, for example, tightens the first and second supports 44a, 44b toward one another. The first and second demisting structures 40, 42 are thereby compressed against the partition member 10 and secured in position on either side of the opening 12.

(16) While in the embodiment shown, the first support 44a is discussed and described with respect to the suction chamber-side of the oil separation assembly and the second support 44b is discussed and described with respect to the crankcase chamber-side of the oil separation assembly, it will be understood that the first and second supports 44a, 44b may be used interchangeably as permitted.

(17) FIG. 2 shows the interior of a compressor at the partition member 10 from the suction chamber side showing the oil separation assembly 100 of FIG. 1 in position relative to an opening (not shown). The oil separation assembly 100 includes the first and second demisting structures 40, 42 and the at least one securing structure 44 which includes the first and second supports 44a, 44b (44b not shown) and the locking structure 44c with locking nut 44d.

(18) FIGS. 3 and 4 illustrate a second embodiment of an oil separation assembly in accordance with embodiments of the present disclosure. Particularly, FIG. 3 is a cross-sectional schematic of an oil separation assembly 100 for use in a reciprocating compressor in accordance with embodiments of the present disclosure and FIG. 4 shows the interior of a compressor at the partition member 10 from the crankcase chamber side showing oil separation assembly 100 secured to the partition member 10 at the opening 12 (not shown).

(19) In the embodiment shown in FIGS. 3 and 4, the suction chamber-side and crankcase chamber-side demisting structures 40, 42 are as described with respect to oil separation assembly 100. The oil separation assembly 100 differs from oil separation assembly 100 in the particular embodiment of the at least one securing structure 44. As shown in FIGS. 3 and 4, the at least one securing structure 44 includes a first support 44a, a second support 44b and a locking structure 44c; however, in the embodiment shown, the first support 44a is a plate and the second support 44b is a baffle plate or cup. Like support structures 44a and 44b, support structures 44a and 44b are tightened towards one another by locking structure 44c (which in the embodiment shown is a locking stud) to compress the suction chamber-side and crankcase chamber-side demisting structures towards one against the partition member 10. The locking structure 44c can be secured using washers and locking nuts 44d.

(20) FIG. 5 illustrates a further embodiment of an oil separation assembly 100 in accordance with embodiments of the present disclosure. Particularly, FIG. 5 is a cross-sectional schematic of an oil separation assembly 100 for use in a reciprocating compressor in accordance with embodiments of the present disclosure. As in FIGS. 1-4, the oil separation assembly 100 is shown secured to the partition member 10 and the opening 12. In the embodiments shown in FIGS. 1-4, the oil separation assemblies 100 and 100 include demisting structures 40, 42 on both the suction chamber 20 side of the opening 12 and the crankcase chamber 30 side of the opening 12; however, in the embodiment shown, there is a single demisting structure 42 which is on the crankcase chamber 30 side of the opening 12. The demisting structure 42 may be as described above.

(21) To secure the demisting structure 42 in position, the oil separation assembly 100 includes at least one securing structure 44 which includes a first support 44a, a second support 44b and a locking structure 44c. More particularly, in the embodiment shown, the first support 44a is a channel-forming support which extends from the opening 12 into the crankcase chamber 30. The first support 44a is a tube-like structure which creates a channel into the crankcase chamber 30 around which the demisting structure may be positioned. The first support 44a also serves as a structure with which the locking structure 44c can engage. To facilitate adequate flow through the suction chamber 20 and crankcase chamber 30, and facilitate pressure equalization between the chambers 20, 30, the embodiment shown in FIG. 5 the first support 44a also includes cross holes 46 to allow gasses to pass through the opening 12 and demisting structure 42. In the embodiment shown in FIG. 5, the second support 44b is a structure which provides a first barrier for larger oil droplet, such as, for example, a plate or a cup as described with reference to FIGS. 1-4, above. The locking structure 44c is a structure which engages the first and second supports 44a, 44b to secure the demisting material 42 in position relative to the opening 12. In an embodiment shown, the locking structure 44c is a screw.

(22) One advantage of the oil separation assembly described herein is that the assembly may be installed into existing reciprocating compressors. That is, existing reciprocating compressors may be retrofit with the oil separation assembly of the present disclosure. Existing reciprocating compressors may therefore exhibit the improvements in operation provided by the oil separation assembly.

(23) To install the oil separation assembly in a reciprocating compressor, whether a new compressor or an existing compressor, a first demisting structure is provided at an opening at the partition member of the compressor on the crankcase chamber-side of the opening. If a suction chamber-side demisting structure is to be used, the second demisting is provided at the opening at the suction chamber-side of the opening. The at least one securing structure is then assembled in operable relation to the first (and, if utilized, second) demisting structure(s) to secure the demisting structure(s) in place.

(24) In an embodiment, the at least one securing structure includes a first support, a second support and a locking structure. In such embodiment, the step of assembling the at least one securing structure in operable relation to the first (crankcase chamber-side) demisting structure includes positioning a first support in relation to the demisting structure, positioning a second support in relation to the demisting structure, and securing the first and second supports in position using a locking structure.

(25) In an embodiment, only a crankcase chamber-side demisting material is provided. In such an embodiment, the step of assembling the at least one securing structure in operable relation to the demisting material may include, for example, positioning a first support in relation to the opening at the partition member to extend into the crankcase chamber and into the demisting material, positioning a second support in relation to the demisting material in the crankcase chamber, and securing the first and second supports together in relation to the demisting structure using a locking structure.

(26) In an embodiment in which two demisting structures are used on opposite sides of an opening (i.e., a suction chamber-side demisting material and a crankcase chamber-side demisting material are both used), the step of assembling the at least one securing structure in operable relation to the demisting structures may include, for example, positioning a first support in relation to the suction chamber-side demisting material, positioning a second support in relation to the crankcase chamber-side demisting material, and securing the first and second supports together in relation to the demisting structure using a locking structure.

(27) The oil separation assembly described herein addresses at least three issues. First, the oil separation assembly assists in returning oil collected in the suction chamber back to the crankcase chamber.

(28) Second, the oil separation assembly helps to maintain a pressure equilibrium between the suction chamber and the crankcase chamber.

(29) Third, the oil separation assembly limits the amount of oil passing through the vent holes 12 from the crankcase chamber to the suction chamber when the rotating crankshaft splashes or sprays oil that comes in contact with it.

(30) By (1) assisting in returning oil collected in the suction chamber back to the crankcase chamber, (2) helping to maintain a pressure equilibrium between the suction chamber and crankcase chamber, and (3) limiting the amount of oil passing from the crankcase chamber to the suction chamber, the oil separation assembly decreases oil loss and therefore costs associated with operating and maintaining a reciprocating compressor.

(31) The disclosed oil separation assembly is also easily installed in existing reciprocating compressors at existing vent holes.

(32) Additional advantages of the oil separation assembly will be readily identified and understood by those of skill in the art.

(33) One of skill in the art will understand that the specific measurements (e.g., height, width, diameter, etc.) of the oil separation assembly may vary based on compressor design and the dimensions of the oil separation assembly may be altered accordingly to correspond to the measurements of the compressor.

(34) The terms comprising, including, having, and their derivatives, are not intended to exclude the presence of any additional component, step or procedure, whether or not the same is specifically disclosed.

(35) Unless stated to the contrary, implicit from the context, or customary in the art, all parts and percentages are based on weight and all test methods are current as of the filing date of this disclosure.

(36) It is specifically intended that the crankcase oil separation assembly and related methods not be limited to the embodiments and illustrations contained herein, but include modified forms of those embodiments including portion so the embodiments and combinations of elements of different embodiments as come with the scope of the following claims. In addition, the order of various steps of operation described herein can be varied. Further, numerical ranges provided herein are understood to be exemplary and shall include all possible numerical ranges situated therebetween.