ES2773696T3 - Edge Mounted O-Ring Pump - Google Patents

Abstract

A fluid pump (10) comprising: a pump housing (12); a portion of the inlet wall (14) located adjacent to the pump casing and including an extended portion (14a) extending generally parallel to a surface of the inner wall (12a) of the pump casing 5 ; a motor (16) housed within the pump housing; an impeller (20) that responds to the motor; an impeller retainer (22) disposed adjacent the impeller and including a rounded edge (38) at an upper peripheral corner of the impeller retainer (22); and an O-ring (36) located on the rounded edge, the O-ring exerting a non-perpendicular force on the surface of the inner wall (12a) of the pump casing to form a seal against the surface of the inner wall ( 12a) from the pump casing; wherein the O-ring (36) exerts a force that forms approximately a 45 degree angle relative to the inner wall surface (12a) of the pump casing (12); where only a small portion of the O-ring (36) sits on the rounded edge of the impeller retainer (22); and characterized in that the O-ring also forms a seal against the extended portion of the inlet wall portion.

Description

DESCRIPTION

Rim Mounted O-Ring Pump

Countryside

The present disclosure relates to fluid pumps and more particularly to a fluid pump that includes a rim mounted O-ring, which significantly improves the pressure that can be generated within the pump without leaking past the O-ring.

Background

O-rings are frequently used in various types of pumps to provide a tight seal between two parallel surfaces and more commonly between two parallel metal surfaces. Such O-rings are commonly used on flat, facing, metal surfaces. However, in certain applications where the internal pressures to which it is necessary to pump a fluid, such as a deep groundwater borehole, are significant, such conventional O-ring implementations are relatively limited in the internal pressure that they can support before of a leak.

The possibility of improving the internal pumping pressure than a fluid pump, for example a fluid pump used in groundwater borehole drilling, would extend the capacity of existing pumps and allow existing pumps to support internal pressures Higher even than is currently possible with conventionally mounted O-rings. In particular, the ability to accept higher internal pressures would be especially useful in regenerative fluid pumps, which are capable of generating significantly higher internal pressures, and which are used in especially deep boreholes that extend 100 meters or more below the surface of the tank. ground.

EP 1327781 discloses a pump in which all parts of the pump that come into contact with the material being pumped are made of a material that meets the appropriate requirements for sterility, or are lined with such material. The induction hood and the flow channel housing, like all other static components open to the functional cavities, are hermetic from each other.

Document EP 2366905 discloses a multistage pump comprising an outer jacket with a suction port and a supply port, arranged at one end with a covering cover, and at the opposite end with a hydraulic sealing ring supporting an electric motor. associated with rotating pumping elements. The cover cover and the lantern ring are attached to the ends of the outer jacket through a fixing means with the interposition of annular packings. Each gasket is housed in an annular seat defined by an annular-shaped area, present in the cover cover and lantern ring, and by a counter-shaped annular area present in the corresponding end of the outer jacket, opposite each other. .

JP H06-229393 discloses a pump in which an impeller is arranged in an intake side cover and an opening hole communicated with a rotor chamber is provided in the intake side end portion of an engine frame in an encapsulated motor. An end plate is provided to lock the rotor chamber at the end portion of the discharge side of the motor frame. A main body part is provided with a cyclone separator provided with a cylindrical part, a circular part extending from the cylindrical part, an intake port arranged in the cylindrical part, and a discharge port arranged in the end part of the part. circular integrated on the outside of the end plate and on the discharge side cover. An opening hole communicating with the rotor chamber is provided inwardly in the radial direction of the end plate.

Compendium

In one aspect of the present invention there is provided a fluid pump as defined in claim 1.

Brief description of the drawings

The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

Figure 1 is a partial side cross-sectional view of a pump in accordance with one embodiment of the present disclosure;

Figure 2 is an enlarged view of a part of the pump shown in Figure 1, showing in even more detail an area where an O-ring of the present disclosure is mounted on an edge of one of the components of the bomb; and

Figure 3 illustrates graphs of the internal pressures that are achieved in the pump using a conventional O-ring and the new edge-mounted O-ring construction of the present disclosure.

Detailed description

The following description is merely exemplary in nature and is not intended to limit the disclosure, application or uses herein, the scope of protection of the present invention being determined by the appended claims.

Referring to FIG. 1, a pump 10 is shown according to one embodiment of the present disclosure. Pump 10 is a regenerative pump built largely in accordance with the description provided in co-pending U.S. Non-Provisional Application Serial No. 15 / 100.904, filed June 1, 2016 (16783-000123 -US-NPB). The pump 10 in the present disclosure differs only from the pump shown in copending US application Serial No. 15 / 100,904 at the seal, which is disposed adjacent to an impeller of the regenerative pump, such as as will be described below in detail.

Continuing with reference to Figure 1, pump 10 generally includes a tubular, metallic pump housing 12 having a housing end wall 14 with fluid inlet ports 15. Inside pump housing 12 There is a motor 16, which can be a DC or AC powered motor, having an output shaft 18. The following discussion will refer to a DC motor, although it will be appreciated that pump 10 is equally suitable for use with DC motors. AC or DC.

The output shaft 18 of the DC motor 16 drives an impeller 20 through a connection to an impeller retainer 22. The impeller 20 is disposed between the impeller retainer 22 and an impeller housing 24. A bushing Outlet terminal 26 is provided at an opposite end of the pump housing 12 and includes a discharge hole 28, through which fluid that has entered pump 10 is pumped out of the pump. suitable (not shown) to discharge hole 28, through which fluid can be pumped upward in the bore, within which pump 10 is located, to a collecting tank or reservoir. A conduit 30 forms a means for making an electrical connection to the DC motor 16 in order to power the DC motor. Within the pump housing 12 there is also located a circuit board 32 to help control the DC motor 16 and to control the overall operation of the pump 10.

Referring to Figure 2, the circled area labeled 2 in Figure 1 is shown in a greatly enlarged manner. The impeller retention device 22 includes a supply channel 34 formed therein, and the impeller 20 includes a channel 20a that communicates with the supply channel 34 and is used to pump fluid into a discharge channel (not visible in FIG. 2) in the impeller housing 24. Disposed at one corner of the interface of the impeller retainer 22 and the impeller housing 24 is an O-ring 36 that seals the interface area between these two components. O-ring 36 is supported in a new rim-mounted configuration that provides significantly improved pump performance by making it possible for significantly increased internal pressure to be accommodated in pump 10.

Edge mounting of the O-ring 36 is accomplished by providing a rounded edge 38 at an upper peripheral corner of the impeller retainer 22. The O-ring 36 is only partially seated within the rounded edge 38. The radius of curvature of the rounded edge 38 is preferably approximately the same, and more preferably exactly the same, as the radius of the O-ring 36. The end wall of the housing 14 includes an extended portion 14a having a flat surface 14b that is in contact with the O-ring 36 and helps to cause a controlled deformation of the O-ring 36. The O-ring 36 is also in contact with a flat upper surface 24a of a leg 24b of the impeller housing 24. All contacts of the O-ring 36 with the flat surface 14b of the extended portion 14a, as well as with the upper flat surface 24a of the impeller housing leg 24b and with the rounded edge or 38 cooperate to cause deformation of the O-ring in a controlled manner so that it protrudes along directional arrow 40. Directional arrow 40 extends generally at approximately a 45 degree angle relative to the housing of the pump 12. The 45 degree angle of the bulge provides a first vector component that pushes up against the flat surface 14b of the extended portion 14a of the end wall of the casing 14, while simultaneously pushing out along the pump. along a horizontal vector against a surface of the internal wall 12a of the pump housing 12. This facilitates the simultaneous creation of three sealing surfaces with a single O-ring 36: a first seal between the flat surface 14b and the device impeller retention 22; a second seal between the upper surface 24a of the casing of the impeller 24 and the surface of the inner wall 12a of the casing 12; and a third seal between the inner wall surface 12 and the right side of the O-ring 36.

The edge supported O-ring 36 shown in Figures 1 and 2 makes it possible to handle significantly higher internal pump pressures, which would not be possible with a conventional O-ring assembly. Figure 3 illustrates the significantly increased pressures supported by the O-ring 36 with relative to a conventional O-ring. In Figure 3, Graph 42 represents the pressures that can be achieved using the O-ring 36, while Graph 44 represents the pressures that can be achieved using a conventional O-ring.

The rim-mounted O-ring 36 of the present pump 10 described herein does not require the inclusion of additional component parts in the pump, nor does it require extensive modifications to the internal components of the pump. The construction of the edge-mounted O-ring 36 also does not require significant modifications to the assembly procedure for assembling pump 10, nor does it add appreciably to the overall cost or complexity of pump 10. The significantly increased pressures that pump 10 can admit, make it possible for it to be used to pump liquids from depths that have hitherto been impossible when pumping with a conventional O-ring seal construction.

Claims (9)

1. A fluid pump (10) comprising: a pump housing (12); an inlet wall portion (14) located adjacent to the pump housing and including an extended portion (14a) extending generally parallel to a surface of the inner wall (12a) of the pump housing; a motor (16) housed within the pump casing; an impeller (20) that responds to the motor; an impeller retainer (22) disposed adjacent the impeller and including a rounded edge (38) at an upper peripheral corner of the impeller retainer (22); and an O-ring (36) located on the rounded edge, the O-ring exerting a non-perpendicular force on the surface of the inner wall (12a) of the pump housing to form a seal against the surface of the inner wall (12a) of the pump housing; wherein the O-ring (36) exerts a force that forms approximately a 45 degree angle relative to the inner wall surface (12a) of the pump casing (12); where only a small portion of the O-ring (36) sits on the rounded edge of the impeller retainer (22); and characterized by the o-ring also forms a tight seal against the extended part of the inlet wall part 2. The fluid pump of claim 1, wherein the O-ring has a radius approximately similar to the radius of the rounded edge. The fluid pump of claim 1 or claim 2, further including an impeller housing (24) positioned within the pump housing to house the impeller, the impeller housing including a leg portion (24b) that is projected from this. The fluid pump of claim 3, the leg portion projecting parallel and adjacent to the inner wall surface (12a) of the pump housing. The fluid pump of claim 3 or claim 4, wherein the O-ring contacts a surface of the leg portion. 6. The fluid pump of any one of the preceding claims, wherein the O-ring protrudes so as to exert the force at approximately a 45 degree angle relative to the surface of the inner wall (12a) of the pump housing . The fluid pump of any one of the preceding claims, wherein the rounded edge contacts a small portion of the O-ring. The fluid pump of any one of claims 3 to 7, wherein the O-ring simultaneously forms a triple seal that includes: a first seal between the extended portion of the inlet wall portion and the impeller retainer; a second seal between an upper surface of the leg portion of the impeller housing and the surface of the inner wall (12a) of the pump housing; and a third seal between the inner wall surface (12a) of the pump casing and the rounded edge. 9. The fluid pump of any one of claims 3 to 8, wherein the O-ring contacts simultaneously with: the rounded edge of the impeller retainer; a surface of the extended part of the entrance wall part; an upper surface of the leg portion of the impeller housing; and the inner wall surface (12a) of the pump casing.