End suction pump with double-entry impeller

Abstract

The art is generally described for an end suction pump adapted for a dual inlet impeller. An example end suction pump includes a body casing with a pump housing, a single inlet, a single outlet, and a magnetically coupled drive for providing drive to an impeller within the body casing. Fluid flows from the impeller inlet in the body casing through a primary flow path to one side of the impeller (e.g., the right eye side) and also through a secondary flow path through a fixed shaft having a semi-hollow hydraulic passage therein to the other side of the impeller (e.g., the left eye side).

Description

Background Art

[0001]

[0001] Unless otherwise indicated in this specification, the materials described in this section are not prior art to the claims of this application and are not admitted to be prior art by inclusion in this section.

[0002]

[0002] An end suction pump is a centrifugal pump that moves fluid by transferring rotational energy from a driven rotor called an impeller. The fluid enters the centrifugal pump at an inlet where the impeller is located. A motor is utilized to rotate a shaft connected to the impeller, thereby controlling the rotation of the impeller. The rotational movement of the impeller generates a centrifugal force that increases the velocity of the fluid so that the fluid flows through the pump casing to the outlet.

[0003]

[0003] The design of a centrifugal pump depends on the type of fluid and the desired flow rate. High-capacity pump applications typically involve low-viscosity fluids such as water, solvents, chemicals, and light oils. Some typical applications of the pump include water supply, circulation pumps, irrigation pumps, and chemical transfer pumps.

Summary of the Invention

[0004]

[0004] This disclosure generally describes an end suction pump that utilizes a semi-hollow stationary shaft to implement a dual-fluid path from a single fluid inlet to the impeller.

[0005]

[0005] In some examples, an end suction pump device is described herein that includes a pump casing, an impeller, and a semi-hollow stationary shaft. The pump casing may have an inlet port and an outlet port. The impeller may be located within the pump casing, where the impeller has a left eye side and a right eye side. The semi-hollow stationary shaft may be located within the pump casing. The impeller may be located around the circumference of this shaft. The right-side eye of the impeller may be configured to receive fluid from the inlet port of the pump casing via a primary flow path. The left-side eye of the impeller may be configured to receive fluid from the inlet port of the pump casing via a secondary flow path through the body of the semi-hollow stationary shaft.

[0006]

[0006] In various examples, an end suction pump device is described that includes a pump body casing, a magnet carrier, an impeller, and a semi-hollow stationary shaft. The pump body casing may have an inlet port, an outlet port, and a driver mounting surface configured to couple to an external driver. The magnetic carrier may be located within the pump body casing and may be arranged to magnetically couple to the magnetic material of the external driver. The impeller may be located within the pump body casing and may be coupled to the magnet carrier such that the impeller rotates in response to the movement of the magnetic material of the external driver, where the impeller has a left eye side and a right eye side. The semi-hollow stationary shaft may be located within the pump casing. The impeller may be located around the circumference of the shaft, where the right-side eye of the impeller may be configured to receive fluid from the inlet port of the pump casing via a primary flow path, and the left-side eye of the impeller may be configured to receive fluid from the inlet port of the pump casing via a secondary flow path through the body of the semi-hollow stationary shaft.

[0007]

[0007] Some example end suction pumps described herein may further include a discharge path from the impeller to the outlet port of the pump casing. Also, the semi-hollow stationary shaft may further include an inlet portion of an outlet portion coupled to the inlet port of the pump casing and an outlet portion disposed about near the left eye of the impeller.

[0008]

[0008] In some further examples, the semi-hollow stationary shaft may further include one or more vanes extending from its inlet portion to its outlet portion. For example, the semi-hollow stationary shaft may further include one or more vanes, or three or more vanes, extending from its inlet portion to the corresponding outlet portion. Some examples of the semi-hollow stationary shaft may include one or more of a semi-hollow metallic material, a semi-hollow non-metallic material, a reinforcing material, or combinations thereof.

[0009]

[0009] The impeller of some example end suction pumps described herein may further include one or more fan blades positioned about the circumference of the semi-hollow stationary shaft. The impeller may further include an impeller cover that covers the fan blades within the body casing. The impeller may be constructed of one or more of a metallic material, a non-metallic material, a reinforcing material, or combinations thereof.

[0010]

[0010] In some examples described herein, the semi-hollow stationary shaft and the pump casing of the end suction pump may be arranged such that the primary flow path and the secondary flow path each comprise 50% of the overall flow from the inlet port of the pump casing. Some example end suction pumps may include a magnet carrier disposed within the pump casing and coupled to the impeller such that the movement of the magnet carrier results in the rotational movement of the impeller.

[0011]

[0011] In yet another example, an end suction pump device is described that includes a pump body casing, a magnetic carrier, a semi-hollow fixed shaft, and an impeller. The pump body casing may include an inlet port, an outlet port, a primary impeller inlet, a secondary impeller inlet, and a driver mounting surface configured to couple to an external driver. The magnet carrier may be positioned within the pump body casing and arranged to magnetically couple to the magnetic material of the external driver. The semi-hollow fixed shaft may be positioned within the pump casing, where the inlet of the semi-hollow fixed shaft is coupled to the inlet port of the pump casing, the outlet of the semi-hollow fixed shaft is coupled to the secondary impeller inlet of the pump body casing, and the semi-hollow fixed shaft has a hydraulic passage therein. The impeller may be circumferentially positioned around the semi-hollow fixed shaft within the pump body casing, where the impeller is coupled to the magnet carrier such that the impeller rotates in response to the movement of the magnetic material of the external driver, and the impeller has a right eye side facing the primary impeller inlet and a left eye side facing the secondary impeller inlet.

[0012]

[0012] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the exemplary aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

[0013]

[0013] The foregoing and other features of the present disclosure will become more fully apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. It is to be understood that these drawings illustrate only some embodiments in accordance with the present disclosure and are therefore not to be considered as limiting its scope, and that the present disclosure will be described in more specific and detailed manner through the use of the accompanying drawings.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5

Figure 6

DETAILED DESCRIPTION OF THE INVENTION

[0015] All of these in the drawings are arranged in accordance with at least some of the embodiments described herein.

[0016]

[0014] In the following detailed description, reference is made to the accompanying drawings which form a part hereof. In the drawings, like symbols typically identify like components, unless the context dictates otherwise. The exemplary embodiments described in the detailed description, drawings, and claims are not intended to be limiting. Other embodiments may be utilized and other changes may be made without departing from the spirit or scope of the subject matter presented herein. The aspects of the present disclosure generally described and illustrated in the drawings may be arranged, replaced, combined, separated, and designed in a wide variety of different configurations, all of which are explicitly contemplated herein.

[0017]

[0015] The present disclosure generally relates to methods, devices, systems, and / or magnetic drive pump devices that use a double inlet impeller design having a substantially the same footprint as an end suction pump, particularly.

[0018] Briefly stated, generally, a technique for a pump including a double inlet impeller design is described. The rotating element of the pump can be magnetically coupled to a motor for driving the impeller. A single flange design can be used, where a primary impeller inlet delivers fluid to one side of the impeller and a secondary impeller inlet delivers fluid to the other side of the impeller via a stationary shaft having a semi-hollow hydraulic passage therein.

[0019]

[0017] The present disclosure recognizes that while end suction pumps are generally available at a lower cost than double suction pumps, they come at the expense of reduced reliability and limited use. End suction pumps are used in a wider range of applications and thus have a higher installation base than double suction pumps. On the other hand, double suction pumps have higher reliability and are suitable for low suction pressure applications.

[0020]

[0018] Customers often select ANSI / ISO type process pump applications when harmful and / or corrosive chemicals are present. Magnetic drive pumps are typically designed as end suction pumps compliant with ANSI / ISO dimensional standards. Magnetic drive pumps eliminate the need for mechanical shaft seals and thus excel in harsh chemical environments. Thus, magnetic drive end suction pumps are often replaced with their general process pumps when handling highly corrosive or toxic chemicals.

[0021]

[0019] FIG. 1 illustrates an exemplary end suction pump 100 having a double inlet impeller arranged in accordance with at least some embodiments described herein. The exemplary end suction pump 100 includes a body casing 110 having a pump housing 120, a single inlet flange 130, and a single outlet flange 140. The end suction pump 100 further includes a magnetically coupled drive unit 150 fitted to the body casing 110 for effecting drive to an impeller within the pump housing 120. The inlet 130 of the pump housing delivers fluid to one side (e.g., the right eye side) of the impeller via a primary flow path from the impeller inlet of the body casing, and also delivers fluid to the other side (e.g., the left eye side) of the impeller via a secondary flow path through a fixed shaft having a semi-hollow hydraulic passage therein.

[0022]

[0020] FIGS. 2A and 2B illustrate detailed cutaway views of an exemplary end suction pump 200 having a double inlet impeller arranged in accordance with at least some embodiments described herein. As illustrated in FIG. 2A, the exemplary end suction pump 200 includes a body casing 210 having a pump housing 220, a single inlet flange 230, and a single outlet flange 240. The end suction pump 100 further includes a magnetically coupled drive unit 250 including a first end 252 and a second end 254 illustrated in a left side cross-sectional view. The second end 254 is coupled to the body casing 210 for effecting drive to an impeller within the pump housing 220. The inlet 230 further illustrated in a right side cross-sectional view is configured to deliver fluid to one side of the impeller via an impeller inlet, and a second impeller inlet delivers fluid to the other side of the impeller via a fixed shaft having a semi-hollow hydraulic passage therein.

[0023]

[0021] Figure 2B illustrates an enlarged cutaway view of an end suction pump 200, which is an example of that in Figure 2A, with additional details identified. As shown, the end suction pump 200 includes a drive unit 250 having an end 254 coupled (e.g., via fasteners such as bolts, rivets, screws, etc.) to a body casing 210. At the end 254, a drive magnet 256 is arranged to magnetically couple with a pump magnet 212 located within the body casing 210. A fixed shaft extends from the inlet side of the body casing 210 (e.g., near the inlet 230) towards the drive end of the body casing 210. An impeller 280 is circumferentially positioned around the fixed shaft 260, where the impeller 280 is configured to rotate around the fixed shaft in response to the movement of the drive unit 250 via magnetic coupling. The inlet 230 is positioned around an opening (e.g., an inlet portion) of the fixed shaft 260, where the fixed shaft 260 has a semi-hollow hydraulic passage therein for coupling fluid from the inlet 230 to an outlet 262 on one side of the impeller 280 (e.g., from the left eye side of the impeller). Another inlet 270 is positioned around the outside of the fixed shaft 260 and is configured to couple fluid from the inlet 230 to the other side of the impeller 280 (e.g., from the right eye side of the impeller).

[0024]

[0022] FIG. 3 illustrates a conceptual cutaway assembly view of an end suction pump 300 with a double inlet impeller according to an aspect of the embodiments described herein. The operation of the pump 300 is substantially the same as that of the pump 200 illustrated in FIG. 2, but is shown simplified for clarity. The end suction pump 300 includes a pump casing 310 having a magnet carrier 320, a single inlet flange (not shown), and a single outlet flange 330. The single inlet flange (not shown) supplies fluid to a primary impeller inlet 360, which is located on one side (e.g., the right eye side) of an impeller 340 within the pump casing 310. The single inlet flange (not shown) also supplies fluid to a semi-hollow stationary shaft 350, which provides a hydraulic inlet path 370 that leads through an opening 352 within the shaft 350 to the other side (e.g., the left eye side) of the impeller 340 within the pump casing 310.

[0025]

[0023] The magnetic carrier 320 is configured to rotate the impeller 340 to generate an attractive force during operation of the pump. The magnetic coupling of the drive unit is advantageous for providing a seal-free pump that has the advantage of being able to pump corrosive materials without compromising the seal. The magnetic drive pump does not require a rotating shaft, and thus, the shaft can be implemented as a fixed solid shaft. Recognizing the disadvantages of the end suction pump design, the present disclosure contemplates a new design that modifies the end suction pump with a semi-hollow shaft that can deliver hydraulic fluid to the impeller through a passage within the shaft. This will become more apparent in the description of FIG. 3.

[0026]

[0024] Figure 4 illustrates a semi-hollow fixed shaft 400 for an end suction pump having a double inlet impeller, arranged in accordance with at least some embodiments described herein. The shaft is illustrated with a plurality of hydraulic fluid passages. In this example, starting from the right, the shaft 400 is attached to the pump casing by a fixed bearing (not shown). Fluid enters the shaft at an inlet end 402 shown on the right side where an inlet opening 410 is located. The interior of the shaft 400 may include a plurality of vanes 412 or rib-like structures (e.g., three vanes, four vanes,... N vanes) that provide structural support (e.g., rigidity) to the shaft. The vanes or ribs 412 extend from the inlet end 402 (e.g., by the inlet opening 410) along the interior of the shaft to an outlet opening 420 located towards the opposite end 404 of the shaft 400. There may be a plurality of openings 420, and in this example, they are illustrated as being approximately in the middle along the shaft 400 between the inlet end 402 and the opposite end 404. Hydraulic fluid from an inlet flange (not shown) enters the interior of the shaft 400, moves along the vanes, and can exit through one of the openings 420. Thus, the vanes 412 provide not only structural support for the shaft but also a dual role as hydraulic fluid passages, and thus, it can direct hydraulic fluid to the impeller (see, e.g., FIGS. 2 and 3).

[0027]

[0025] The shaft can be made of either a metallic material or a non-metallic material. Some example non-metallic materials can include resin or plastic-based materials including, but not limited to, polytetrafluoroethylene (PTFE), polyoxymethylene (POM), polyetheretherketone (PEEK), polyamide, or combinations thereof. Some example metallic shafts can be made of steel, stainless steel, cast iron, cast aluminum, or other alloys as may be required for a particular application. Some example shaft materials can further include reinforcing elements such as glass fiber, carbon fiber, ceramic, or other reinforcing materials suitable for increasing other properties such as rigidity, durability, and / or corrosion resistance.

[0028]

[0026] FIG. 5 illustrates an impeller and a shaft for an end suction pump having a double inlet impeller arranged according to at least some embodiments described herein. The exemplary impeller and shaft 500 are illustrated from a side view, an end view, an opposing end view, and an oblique side view. As shown, the shaft portion includes an inlet end 502, an opposite end 504, an inlet 510, and one or more vanes 512 extending through the shaft to deliver fluid to the impeller through an outlet that is hidden and not visible in FIG. 5. The impeller includes one or more fan blade portions 522 located under an impeller cover 520, and each blade is circumferentially arranged around the shaft. The outlet can be arranged to deliver fluid to the impeller in a substantially similar manner as previously described with respect to FIGS. 3 and 4. Similar to the shaft, the impeller can be made of either a metallic material or a non-metallic material, or a combination of metallic, non-metallic, or composite materials, as may be required based on specific environmental and operating requirements.

[0029]

[0027] FIG. 6 illustrates the flow of operation of an end suction pump 600 having a double inlet impeller arranged according to aspects of the present disclosure. The end suction pump 600 includes an inlet flow 620 from an inlet flange (see, e.g., FIGS. 1, 2A, and 2B), where 100% of the hydraulic fluid is first drawn into the pump housing 610. Once inside the pump housing 610, the hydraulic fluid moves towards the shaft (see, e.g., FIGS. 3 and 4), where the inlet flow 620 is split into two flow paths 630 and 640 that are approximately equal to each other. Thus, 50% of the inlet flow is directed to flow path 630 and 50% of the inlet flow is directed to flow path 640. Flow path 630 corresponds to the primary flow path, where 50% of the inlet flow is delivered to the right side 670 of the impeller 680. Flow path 650 corresponds to the secondary flow path, where 50% of the inlet flow 620 is delivered to the left side 660 of the impeller 680. The hydraulic fluid exits the pump housing 610 through an outlet flange 690.

[0030]

[0028] The splitting of the inlet flow to supply hydraulic fluid to both sides of the impeller is facilitated by vanes or ribs within the stationary shaft (see, e.g., FIG. 4). Additional passages within the pump housing 610 can be utilized to guide the hydraulic fluid from the stationary shaft to the impeller 680. Thus, modifying the stationary shaft to guide the fluid is a novel approach for providing a suction passage that enables a double-suction impeller to operate within an end-suction pump.

[0031]

[0029] One advantage of the pump design described is that the axial forces acting on the impeller are substantially balanced since the fluid is delivered to both sides of the impeller. These forces on the rotor are substantially symmetric with respect to the impeller by the operation described herein.

[0032]

[0030] An end-suction pump arrangement with a double-entry impeller has several advantages compared to a conventional end-suction pump. One advantage is that in low suction pressure applications, the double-entry pump operates more efficiently than a single-entry pump. Another advantage is the improved mechanical reliability from a hydraulically balanced design with a fully supported shaft (e.g., the hydraulic fluid is supplied equally on both sides of the impeller). These advantages are achieved while maintaining an end-suction pump configuration that includes a double-entry arrangement hidden within the pump housing. The end-suction pump may be desirable in that it has a smaller footprint and thus can be deployed at a lower cost.

[0033]

[0031] The present disclosure should not be limited to the specific embodiments described herein, which are intended as examples of various aspects. Many modifications and variations can be made without departing from the spirit and scope thereof. In addition to those listed herein, functionally equivalent methods and apparatuses within the scope of the present disclosure are possible from the foregoing description. Such modifications and variations are intended to be included within the scope of the appended claims. The present disclosure should be limited only by the terms of such claims, together with the full scope of equivalents to which such claims are entitled. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0034]

[0032] The subject matter described herein sometimes illustrates different components included within or connected to different other components. The architecture so illustrated is merely an example, and in fact, many other architectures that achieve the same function can be implemented. In a conceptual sense, any arrangement of components for achieving the same function is effectively "associated" so that the desired function is achieved. Accordingly, any two components combined herein to achieve a particular function can be regarded as "associated" with each other so that the desired function is achieved, regardless of the architecture or intermediate components. Similarly, any two components so associated can also be regarded as "operably connected" or "operably coupled" to each other to achieve the desired function, and any two components that can be so associated can also be regarded as "operably couplable" to each other to achieve the desired function. Specific examples of being operably couplable include, but are not limited to, components that can be physically connected and / or physically interact, and / or components that can wirelessly interact and / or wirelessly interact, and / or components that logically interact and / or logically interactable.

[0035]

[0033] Regarding the use of substantially any plural and / or singular terms in this specification, one of ordinary skill in the art can convert from the plural to the singular and / or from the singular to the plural as appropriate for the context and / or application. Various singular / plural substitutions may be set forth in this specification for clarity.

[0036]

[0034] Generally, the terms used in this specification and particularly in the appended claims (e.g., the body of the appended claims) are generally intended to be “open” terms (e.g., the term “including” should be construed as “including, without limitation,” the term “having” should be construed as “having at least,” the term “includes” should be construed as “including, without limitation,” etc.). If a specific number of introductions of claim recitations is intended, such intention is explicitly recited in the claim, and in the absence of such a recitation, it will be further understood by those skilled in the art that no such intention exists. For example, for purposes of illustration, the following appended claims may include the use of introductory phrases such as “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed as implying that the introduction of a claim recitation by the indefinite article “a” or “an” limits any particular claim that includes such introduced claim recitation to embodiments that include only one such recitation, and this should not be so construed even when the same claim includes both the introductory phrase “one or more” or “at least one” and the indefinite article “a” or “an” (e.g., “a” and / or “an” should be construed as meaning “at least one” or “one or more”). The same holds true for the use of the definite article used to introduce a claim recitation. In addition, even if a specific number of introductions of claim recitations is explicitly recited, those skilled in the art will recognize that such recitation should be construed as meaning at least the recited number (e.g., a bare recitation of “two recitations” without other modifiers means at least two recitations, or two or more recitations).

[0037]

[0035] Furthermore, in cases where a convention similar to "at least one of A, B, and C, etc." is used, generally, such syntax is intended in a sense that one of ordinary skill in the art would understand the convention (e.g., "a system having at least one of A, B, and C" would include, without limitation, a system having only A, only B, only C, A and B together, A and C together, B and C together, and / or A, B, and C together, etc.). It will be further understood by one of ordinary skill in the art that any substantially discrete words and / or phrases presenting two or more alternative terms, whether in the specification, claims, or drawings, are to be understood as contemplating the possibility of including one of those terms, any of those terms, or both terms. For example, the phrase "A or B" would be understood to include the possibility of "A" or "B", or "A and B".

[0038]

[0036] For any purpose, for example, from the perspective of providing a written description, all ranges disclosed herein also include any possible sub-ranges and combinations of those sub-ranges. Any recited range can be readily recognized as enabling a full description of the same range decomposed into at least equal halves, thirds, fourths, fifths, tenths, etc. As a non-limiting example, each range described herein can be readily decomposed into a lower third, a middle third, and an upper third, etc. As will also be understood by one of ordinary skill in the art, all language such as "up to", "at least", "greater than", "less than", etc. includes the recited numbers and refers to ranges that can then be decomposed into sub-ranges as described above. Finally, ranges include each individual member. Thus, for example, a group having 1 to 3 cells refers to a group having 1, 2, or 3 cells. Similarly, a group having 1 to 5 cells refers to a group having 1, 2, 3, 4, or 5 cells, and so on.

[0039] Although various aspects and embodiments have been disclosed in this specification, other aspects and embodiments are possible. The various aspects and embodiments disclosed in this specification are for illustrative purposes and are not intended to be limiting, and the true scope and spirit are indicated by the following claims. The invention described in the original claims of the present application is appended below. [1] An end suction pump device, comprising a pump casing having an inlet port and an outlet port, an impeller located within the pump casing, wherein the impeller has a left eye side and a right eye side, a semi-hollow fixed shaft within the pump casing, and is provided with wherein the impeller is located around the circumference of the shaft, the right eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a primary flow path, the left eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a secondary flow path passing through the body of the semi-hollow fixed shaft. An end suction pump device. [2] The end suction pump device according to [1], further comprising a discharge path from the impeller to the outlet port of the pump casing. [3] The end suction pump device according to [1], wherein the semi-hollow fixed shaft further comprises an inlet portion of an outlet portion coupled to the inlet port of the pump casing and an outlet portion disposed near the left eye of the impeller. [4] The end suction pump device according to [3], wherein the semi-hollow fixed shaft further comprises one or more vanes extending from the inlet portion to the outlet portion thereof. [5] The end suction pump device according to [3], wherein the semi-hollow fixed shaft further comprises three or more vanes extending from the inlet portion to the corresponding outlet portion thereof. [6] The end suction pump device according to [3], wherein the semi-hollow fixed shaft comprises one or more of a semi-hollow metal material, a semi-hollow non-metal material, a reinforcing material, or a combination thereof. [7] The end suction pump device according to [1], wherein the impeller further comprises one or more fan blades located around the circumference of the semi-hollow fixed shaft. [8] The end suction pump device according to [7], wherein the impeller further comprises an impeller cover covering the fan blades within the main body casing. [9] The end suction pump device according to [1], wherein the impeller includes one or more of a metal material, a non-metal material, a reinforcing material, or a combination thereof.

[10] The end suction pump device according to [1], wherein the semi-hollow fixed shaft and the pump casing are arranged such that the primary flow path and the secondary flow path each comprise 50% of the total flow from the inlet port of the pump casing.

[11] The end suction pump device according to [1], further comprising the magnet carrier disposed within the pump casing and coupled to the impeller such that movement of the magnet carrier causes rotational movement of the impeller.

[12] An end suction pump device, a pump body casing having an inlet port, an outlet port, and a driver mounting surface configured to be coupled to an external driver; a magnet carrier located within the pump body casing and arranged to be magnetically coupled to the magnetic material of the external driver; an impeller located within the pump body casing and coupled to the magnet carrier such that the impeller rotates in response to movement of the magnetic material of the external driver, wherein the impeller has a left eye side and a right eye side; a semi-hollow fixed shaft within the pump casing; comprising; wherein, the impeller is located around the circumference of the shaft; the right eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a primary flow path; the left eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a secondary flow path passing through the body of the semi-hollow fixed shaft, the end suction pump device.

[13] The end suction pump device according to

[12] , further comprising a discharge path from the impeller to the outlet port of the pump casing.

[14] The end suction pump device according to

[12] , wherein the semi-hollow fixed shaft further comprises an inlet portion of an outlet portion coupled to the inlet port of the pump casing and an outlet portion disposed near the left eye of the impeller.

[15] The end suction pump device according to

[14] , wherein the semi-hollow fixed shaft further comprises one or more vanes extending from the inlet portion to the outlet portion.

[16] The end suction pump device according to

[12] , wherein the impeller further includes one or more fan blades located around the circumference of the semi-hollow fixed shaft.

[17] The end suction pump device according to

[12] , wherein the semi-hollow fixed shaft and the pump casing are arranged such that the primary flow path and the secondary flow path each comprise 50% of the overall flow from the inlet port of the pump casing.

[18] An end suction pump device, a pump body casing having an inlet port, an outlet port, a primary impeller inlet, a secondary impeller inlet, and a driver mounting surface configured to be coupled to an external driver; a magnet carrier located within the pump body casing and arranged to be magnetically coupled to the magnetic material of the external driver; a semi-hollow fixed shaft within the pump casing, wherein an inlet of the semi-hollow fixed shaft is coupled to the inlet port of the pump casing, an outlet of the semi-hollow fixed shaft is coupled to the secondary impeller inlet of the pump body casing, and the semi-hollow fixed shaft has a hydraulic passage therein; an impeller circumferentially located around the semi-hollow fixed shaft within the pump body casing, wherein the impeller is coupled to the magnet carrier such that the impeller rotates in response to movement of the magnetic material of the external driver, and the impeller has a right eye side facing the primary impeller inlet and a left eye side facing the secondary impeller inlet; comprising an end suction pump device.

Claims

1. An end suction pump device, comprising: a pump casing having a single inlet port and a single outlet port; an impeller located within the pump casing, wherein the impeller has a left eye and a right eye; a semi-hollow fixed shaft within the pump casing; and wherein the semi-hollow fixed shaft extends from the right eye side of the impeller to the pump casing on the left eye side of the impeller; the impeller is located around the circumference of the shaft; the right eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a primary flow path; the left eye of the impeller is configured to receive fluid from the inlet port of the pump casing through a secondary flow path passing through the body of the semi-hollow fixed shaft. An end suction pump device.

2. The end suction pump device according to claim 1, further comprising a discharge path from the impeller to the outlet port of the pump casing.

3. The end suction pump device according to claim 1, wherein the semi-hollow fixed shaft further comprises an inlet portion coupled to the inlet port of the pump casing and an outlet portion disposed near the left eye of the impeller.

4. The end suction pump device according to claim 3, wherein the semi-hollow fixed shaft further comprises one or more vanes extending from the inlet portion to the outlet portion thereof.

5. The end suction pump device according to claim 4, wherein the semi-hollow fixed shaft further comprises three or more vanes extending from the inlet portion to the outlet portion thereof.

6. The end suction pump device according to claim 3, wherein the semi-hollow fixed shaft comprises one or more of a semi-hollow metallic material, a semi-hollow non-metallic material, a reinforcing material, or a combination thereof.

7. The end suction pump device according to claim 1, wherein the impeller further comprises one or more fan blades located around the circumference of the semi-hollow fixed shaft.

8. The end suction pump device according to claim 7, wherein the impeller further comprises an impeller cover covering the fan blades within the pump casing.

9. The end suction pump device according to claim 1, wherein the impeller comprises one or more of a metal material, a non-metal material, a reinforcing material, or a combination thereof.

10. The end suction pump device according to claim 1, wherein the semi-hollow fixed shaft and the pump casing are arranged such that the primary flow path and the secondary flow path each comprise 50% of the total flow from the inlet port of the pump casing.

11. The end suction pump device according to claim 1, further comprising the magnet carrier disposed within the pump casing and coupled to the impeller such that movement of the magnet carrier results in rotational movement of the impeller.

12. An end suction pump device, a pump body casing having a single inlet port, a single outlet port, and a driver mounting surface configured to couple to an external driver; a magnet carrier located within the pump body casing and arranged to magnetically couple to a magnetic material of the external driver; an impeller located within the pump body casing and coupled to the magnet carrier such that the impeller rotates in response to movement of the magnetic material of the external driver, wherein the impeller has a left eye and a right eye; a semi-hollow fixed shaft within the pump body casing; comprising wherein the semi-hollow fixed shaft extends from the right eye side of the impeller to the pump body casing on the left eye side of the impeller; the impeller is located around the circumference of the shaft; the right eye of the impeller is configured to receive fluid from the inlet port of the pump body casing via a primary flow path; the left eye of the impeller is configured to receive fluid from the inlet port of the pump body casing via a secondary flow path through the body of the semi-hollow fixed shaft; an end suction pump device.

13. The end suction pump device according to claim 12, further comprising a discharge path from the impeller to the outlet port of the pump body casing.

14. The end suction pump device according to claim 12, wherein the semi-hollow fixed shaft further comprises an inlet portion coupled to the inlet port of the pump body casing and an outlet portion disposed near the left eye of the impeller.

15. The end suction pump device according to claim 14, wherein the semi-hollow fixed shaft further includes one or more vanes extending from the inlet portion to the outlet portion thereof.

16. The end suction pump device according to claim 12, wherein the impeller further includes one or more fan blades located around the circumference of the semi-hollow fixed shaft.

17. The end suction pump device according to claim 12, wherein the semi-hollow fixed shaft and the pump body casing are arranged such that the primary flow path and the secondary flow path each comprise 50% of the overall flow from the inlet port of the pump body casing.

18. An end suction pump device, a pump body casing having a single inlet port, a single outlet port, and a driver mounting surface configured to be coupled to an external driver; a magnet carrier located within the pump body casing and arranged to be magnetically coupled to the magnetic material of the external driver; a semi-hollow fixed shaft within the pump body casing, wherein the inlet of the semi-hollow fixed shaft is coupled to the inlet port of the pump body casing on the right eye side of the impeller, the outlet of the semi-hollow fixed shaft is coupled to the pump body casing on the left eye side of the impeller, and the semi-hollow fixed shaft has a hydraulic passage therein; the impeller is circumferentially located around the semi-hollow fixed shaft within the pump body casing, wherein the impeller is coupled to the magnet carrier such that the impeller rotates in response to the movement of the magnetic material of the external driver, the right eye of the impeller faces the inlet port, and the left eye of the impeller faces the outlet of the semi-hollow fixed shaft. An end suction pump device comprising the above.

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