WO2014016143A2

WO2014016143A2 - A pump having a vibration damping mounting assembly

Info

Publication number: WO2014016143A2
Application number: PCT/EP2013/064819
Authority: WO
Inventors: Ivan GOLUB; Stephan Wentker
Original assignee: Gardner Denver Thomas Gmbh
Priority date: 2012-07-26
Filing date: 2013-07-12
Publication date: 2014-01-30
Also published as: CN104704236B; DE202012007190U1; EP2877747A2; CN104704236A; WO2014016143A3

Abstract

Arrangement comprising a pump and a vibration damping mounting assembly; wherein said pump has a pumping assembly and a motor coupled to said pumping assembly; wherein said pumping assembly has a pump housing, a pump shaft extending into said pump housing, a first reciprocating assembly coupled to said pump shaft, and a first working chamber; wherein said vibration damping mounting assembly has a first vibration damping mounting assembly; wherein said first vibration damping mounting assembly has a first support, the one end of which is coupled to said pump housing; wherein said pump shaft has a pump shaft axis of rotation and wherein said arrangement further comprises a point on said pump housing which oscillates along an arcuate path when said pump is operating at said rated speed and said pump is coupled to said base by said vibration damping mounting assembly.

Description

A PUMP HAVING A VIBRATION DAMPING MOUNTING

ASSEMBLY

The contents of German utility model application 20 2012 007 190.4 is incorporated by reference.

The present invention concerns a vibration damping mounting assembly which mounts a pump to a base, foundation, frame, housing or other structure of a machine for which the pump is a component; the vibration damp- ing mounting assembly absorbs a majority of the forces created by components of the pump which rotate during operation without transferring these absorbed forces to the base, foundation, frame, housing or other structure of a machine in which the pump is a component. Vibration damping mounting assemblies are known for use with pumps. U.S. Patent 6,543,741, Li, discloses a horizontally mounted compressor supported from below by a vibration isolator located as close as practical to the vertical projection of the center of gravity of the compressor. The isolator supports most, if not all, of the weight of the compressor. The ends of the compressor are supported by isolators located as close a practical to the axis of the compressor. US 6,543,741 teaches the supporting of a compressor by three isolation mounts which have or receive pins therein. The isolation mounts are made of neoprene or other suitable elastomeric materials. U.S. patent 5,810,322, Zhao, discloses an apparatus for mounting a horizontal compressor of a vapor compression air conditioner to a foundation. The mounting includes an L-shaped bracket at each compressor end. Each bracket has a horizontal leg adapted for attachment to mounting legs which extend laterally outward from the compressor's casing. Each bracket is sized and otherwise configured so that its vertical leg extends upwardly from the horizontal leg along the outside end of the compressor casing to a point above the driveshaft axis of rotation of the compressor motor. A pin is secured to and extends outwardly from each vertical leg of the bracket. The longitudinal axis of each pin is coincident with the driveshaft axis of rotation. Each pin extends into a pin socket in a respective mounting support which is securely fastened to the foundation of the air conditioner. A resilient grommet is disposed between each pin and its respective pin socket and vibrationally isolates the compressor from the mounting support and the foundation. The pins minimize the transmission of torsional energy from the compressor to the support and foundation.

U.S. patent 4,988,069, D'Silva, discloses a mounting for a stepping motor in a peristaltic pump. The mounting includes a first bracket which rigidly secures the stepping motor housing in a radial direction while providing a bearing assembly connecting the first bracket and the stepping motor housing to allow for free rotational movement. A second bracket is also secured to the stepping motor housing which includes at least one spring which dampens tangential forces. The shock of the step movement is absorbed by the spring which results in a reduction of forces applied to the pump frame to reduce the undesirable vibration and noise.

It is the object of the invention to provide an arrangement comprising a pump and a vibration damping mounting assembly where only a minimum of forces is transmitted to a base or the like when the pump is operating.

An example of an embodiment of the invention includes a pump in combination with a vibration damping mounting assembly. The pump has a pumping assembly and a motor coupled to the pumping assembly. The pumping assembly has a pump housing, a pump shaft extending into said pump housing, a first reciprocating assembly coupled to the pump shaft, and a first working chamber. The vibration damping mounting assembly has a first vibration damping mounting assembly. The first vibration damp- ing mounting assembly has a support with an end coupled to the pump housing. The support has a moveable portion which is moveable in the negative and positive x and y directions relative to a base when the pump is coupled to the base. The pump shaft has a pump shaft axis of rotation. The rotation of the shaft when the pump is operating at its rated speed, recipro- cates the first reciprocating assembly along a path. The reciprocation causes a volume of the first working chamber to expand and contract. A point on said pump housing and on said pump shaft oscillates along an arcuate path when the pump is operating at the rated speed and the pump is coupled to the base by said vibration damping mounting assembly.

Preferably, the point has a pendulum movement relative to a first plane when the pump is operating at said rated speed and the pump is coupled to the base by the vibration damping mounting assembly. In this case the plane intersects the pump shaft and is parallel to said pump shaft when the pump is at rest. The first plane is perpendicular to a second plane. The second plane intersects the pump shaft and is parallel thereto when the pump is at rest.

Further, the pump preferably includes an eccentric coupled to the pump shaft and a portion of the reciprocating assembly.

During rotation of the shaft, a portion of the reciprocating assembly orbits about the eccentric. A majority of the forces caused by the rotation of the pump shaft, rotation of the eccentric, and orbiting of the coupling portion are absorbed by the vibration damping assembly without being transferred to the base along vectors extending in the positive and negative x, y, and z directions.

The pump preferably still includes a further configuration where when the pump is at rest the moveable portion is in line with said pump shaft axis of rotation.

The following is a description of an advantageous embodiment of the invention by means of the drawing.

FIG. 1A is a perspective view of a known conventional vibra- tion damping mounting assembly mounting a conventional known pump to a base; FIG. 1 looks into the pumping assembly of the pump.

FIG IB is a perspective view of a vibration damping mounting assembly mounting a conventional known pump to a base; FIG. 1 looks into the pumping assembly of the pump; FIG IB uses three elastomeric cylinders as opposed to the three doughnuts or rings shown in FIG 1 A to mount the pump to the base.

FIG. 2A is a perspective view of the assembly shown

1A looking into the motor of the pump.

FIG 2B is a perspective view of the assembly shown in figure

2 A looking into the motor of the pump. is a perspective view of a vibration damping mounting assembly which embodies the features of the present invention; the vibration damping mounting assembly is mounting the same type of pump shown in figure 1 to the same type of base shown in figure 1 ; the perspective looks into the pump from the pumping assembly end of the pump. is a perspective view of the assembly shown in FIG. 3, except the perspective looks into the pump from the motor end of the pump. is an exploded view of the pump shown in figure 3. is a sectional view of the pump shown in FIG. 3 taken through and along the length of the motor shaft and pump shaft; the section passes through the length of the support of the first vibration damping mounting assembly; the components of the motor and pumping assembly are omitted so as to exemplify the position of the shafts relative to the vibration damping mounting assembly shown in figure 3. is a sectional view through the pump assembly portion of the pump shown in FIG. 3 the section is perpendicular to the pump shaft; the section passes through a third and fourth side of the pump; the view exemplifies the reciprocating assemblies in the pumping assembly and exemplifies components which make up the pump housing of the pumping assembly.

FIG. 8 is a close up view of the reciprocating assemblies shown in FIG. 7.

FIGS. 9A - FIG. 9C show views of the pump of FIG. 3 looking into the pump from the motor end of the pump wherein the pump is at rest (9 A) or in the initial startup phase (9B, 9C); the figures show how the pump is free to tilt relative to a first plane which intersects and is parallel to the pump shaft; the first plane being drawn when the pump is at rest; the first plane can be considered a vertical plane; the first plane is also perpen- dicular to second a plane which extends in a second direction; the second plane intersects and is parallel to the pump shaft when the pump is at rest; the second plane can be considered a horizontal plane; the axis which tilts relative to the vertical plane is an axis that is perpendicular to a first axis. The first axis is an axis drawn through the pump housing such that the axis is parallel to the second plane when the pump is at rest. Preferably the axis is drawn so that it intersects the pump shaft. Preferably the first axis is drawn so that it is aligned with the center points of the reciprocating assemblies when looking towards the center points in a direction which follows the length of the shaft. The alignment is when the recip- rocating assemblies are in the bottom dead center position. The axis that tilts can be a second axis.

Figure 10 is a graph showing the amount of vibrational forces transmitted by a vibration damping mounting assembly like the one shown in figure 1 to a base plate like the one shown in figure 1 ; wherein the mounting assembly mounts a conventional pump like the one shown in figure 1 to the base plate and the pump is operating at its rated speed.

Figure 1 1 is a graph showing the amount of vibrational forces transmitted by a vibration damping mounting assembly like the one shown in figure 3 to a base plate like the one shown in figure 3; wherein the mounting assembly mounts a conventional pump like the one shown in figure 3 to the base plate and the pump is operating at its rated speed. The conventional pump 40 shown in figures 1 and 2 is connected to a base 41 by way of conventional vibration mounting assembly 42. The conventional mounting assembly includes three elastomeric rings which can also be called doughnuts. The first ring 44 is mounted at a second end 46 of a motor 48. The first ring 44 connects the second end 46 of the motor 48 to the base 41. The first ring 44 is connected to the motor second end 46 to orient the first ring 44 to one lateral side of the axis of rotation of the motor's shaft. The second and third rings 50, 52 are at opposite sides of a pump housing 54 that forms a component of the pumping assembly 56. The rings 50, 52 connect the opposite ends of the pump housing 54 to the base 41. The axis of rotation of the pump shaft extends between the second and third rings 50, 52. The pumping assembly 56 and motor 48 make up the pump 40. Figures 3-9C show a conventional pump 58 which is the same as pump 40. It has a conventional pumping assembly 60 which is the same as pumping assembly 56. It has a conventional motor 62 which is the same as the motor 48. The pump 58 is connected to base 64 which is generally the same as base 41. A vibration damping mounting assembly 66, however, which em- bodies the features of the present invention, connects the pump 58 to the base 64.

Now referring to figures 3-8 the pumping assembly 60 has a first side 68 and a second 70 side opposite the first side 68. The second side 70 is cou- pled to a first end 72 of motor 62. The pumping assembly 60 is coupled to a first vibration damping mounting assembly 74 which forms a portion of the vibration damping mounting assembly 66. The first vibration damping mounting assembly 74 is coupled to a pump housing 76 of said pumping assembly 60. The first assembly 74 couples pump 58 to base 64. The first vibration damping mounting assembly 74 couples pump housing 76 of pumping assembly 60 to the base 64. The coupling is at the first side 68 of the pumping assembly 60. The first side 68 of pumping assembly 60 is also the first side of pump housing 76 and first side of pump case 78. The pump case 78 can also be called a crankcase. The second side 70 of the pumping assembly 60 can also be called the second side of the pump housing 76 and the second side of the pump case 78.

The motor 62 of the pump 58 has a second end 82 opposite its first end 72. The motor 62 is coupled to a second vibration damping mounting assembly 80 which forms part of the vibration damping mounting assembly 66. The second vibration damping mounting assembly 80 connects the motor 62 to the base 64. The motor 62 is connected at its second end 82 by the second vibration damping mounting assembly 80 to the base 64. The term base used herein is generic and refers to and includes any structure to which the pump is connected by the vibration damping mounting assembly 66. The structure includes and could be a base, foundation, housing, frame or other component of a machine to which the pump is connected. The pumping assembly 60 has a third side 83 and a fourth side 85. The third side 83 can be called the third side of the pump housing 76. It can also be called an end of a first pump head 84. The pump head 84 includes a cover 86. The fourth side 85 can be called a fourth side of the pump housing 76. It can also be called an end of a second pump head 88. The second pump head 88 includes a cover 90.

A first axis 92 extends through the third 83 and fourth 85 sides. The first axis 92 is oriented, when looking towards the center point in a direction which follows the length of the shaft, to vertically align with a center point 94 of a first reciprocating assembly 96 when the assembly is in the bottom dead center position. The first axis 92 is also oriented, when looking towards the center point in a direction which follows the length of the shaft, to vertically align with a center point 98 of a second reciprocating assembly 100 when the assembly 100 is in the bottom dead center position. The first axis 92 is also oriented to extend through the pump shaft 102. The first axis 92 is oriented, when the pump is at rest, to be parallel to a second plane 104 and perpendicular to a first plane 106. It can lie in the second plane 104 when the pump is at rest. Also when the pump is at rest the first axis 92 is oriented to be perpendicular to pump shaft 102. A second axis 108 is oriented to extend through the pump housing 76. It is oriented to be perpendicular to the first axis 92. The second axis 108, when the pump is at rest, is perpendicular to and can intersect the pump shaft 102. Also when the pump 58 is at rest it is parallel to the first plane 106 and perpendicular to the second plane 104. It can lie in the first plane 106 when the pump is at rest.

Now referring to figures 9A-9C, the vibration damping assembly 66 is con- structed so that during startup and during operation, when the pump is running at its rated speed, the pump housing 76 of the pumping assembly 60 takes on a certain type of oscillating movement. The oscillating movement is such that fixed points on the pump housing traverse along arcuate paths Also the pump shaft 102 itself traverses an arcuate path. For instance, point 1 10 on the third side 83 of the pump housing 76 and point 1 12 on the fourth side 85 of the pump housing 76, each of which can be in vertical alignment with the first axis 92, when looking towards the first axis 92 in a direction which follows the length of the shaft 102, traverse an arcuate path during start up and during operation when the pump is at running at its rated speed. Point 1 14 on pump housing second side 70 can be in horizontal alignment with the second axis 108 when looking towards the second axis 108 in a direction which follows the length of the shaft 102. The point 1 14 shown is behind second support 172. It can be at an end of the second side. It also traverses an arcuate path during start up and during operation when the pump is at running at its rated speed. Notably, point 1 14, relative to the horizontal plane 104 takes on a pendulum type movement during start up and during operation when the pump is running at its rated speed. The pump shaft itself 102, when looking down the length of the shaft 102 form the motor end, traverses an arcuate path during start up and during operation when the pump is at running at its rated speed. Notably the shaft relative to the horizontal plane 104 takes on a pendulum type movement during start up and during operation when the pump is running at its rated speed. The arcuate paths traversed by points 1 10, 1 12 and 1 14 and pump shaft 102 have a much greater length during start up as compared to when the pump is operating at its rated speed. The arcuate paths traversed by points 1 10, 1 12 and 1 14 and the pump shaft 102 are barely visible when the pump is operating at rated speed. Arrows 1 16, 1 18 and 120 generally depict the nature of the arcuate paths taken on by points 1 10, 1 12, and 1 14 and the shaft. The pump 102 itself would take on an arcuate path like arrow 120 when looking down the length of the shaft 102 form the motor end. The arrows are not intended to reflect the true length of the path taken, the arc angle formed by the path or the actual path. Figures 9B and 9C show the movement of the pump housing 76 as points 1 10, 1 12 and 1 14 move along an arcuate path during start up. Points 1 10 and 1 12 move in the in the negative and positive direction along their arcuate paths. The negative direction is towards the base 64, the positive direction is away from the base 64.

The ability of the pump to move, such that points 1 10, 1 12 and 1 14 on the pump take on an arcuate path during operation when the pump is running at its rated speed and during startup, has importance. It means that a majority of the forces transmitted by rotation of the pump shaft 102, rotation of eccentrics 122, 123 which impart the reciprocating motion on the pump's reciprocating assemblies 96, 100, and the orbiting of the portions 124, 125 of the reciprocating assemblies 96, 100 to which the eccentrics 124, 125 are coupled, are absorbed by the vibration damping mounting assembly 66 without being transferred to the base 64 along force vectors which are par- allel to the first 106 and second 104 planes along the planes' long or short axes.

Testing has borne out the above. For instance, the graph shown in FIG. 10 shows the vibration transmitted by a non-inventive vibration damping mounting assembly connecting a pump like that shown in figures lto a base plate like that shown in figures 1. The mounting assembly is of the type shown in figure 1. The graph measures the vibrations as the magnitude of acceleration of the base in the negative and positive x, y and z direc- tions. Graph line x measures the acceleration in the positive and negative x directions. Graph line y measures the acceleration in the positive and negative y directions. Graph line z measures the acceleration in the positive and negative z directions. The graph in FIG. 1 1 shows the vibration transmitted by a vibration damping mounting assembly with a construction embodying the features of the present invention. The construction of the vibration damping mounting assembly is of the type shown in figure 3. The vibration damping mounting assembly connected a pump like that shown in figure 3 to a base plate like that shown in figure 3. The graph measures the vibrations as the magnitude of acceleration of the base in the negative and positive x, y and z directions. Graph line x measures the acceleration in the positive and negative x directions. Graph line y measures the acceleration in the positive and negative y directions. Graph line z measures the acceleration in the positive and negative z directions. As can be seen by comparing the two graphs, the acceleration along the z and y directions is significantly reduced with the vibration damping assembly shown in figure 3. A further test has also borne out that the mounting assembly described herein has advantages. In this test a ten liter series connected pump like that shown in figure IB and 2B was connected to an aluminum base plate 341 having a 1/4 inch thickness. The base plate 341 had a length which approximated the length of the pump from the first pumping assembly side 3126 to the location of the first cylinder 344 at the motor second end 346. The base plate 341 had a width which approximated width of the pump from the pump housing third side 3128 to the pump housing fourth side 3130. The bottom of the plate was standard smooth aluminum. The mount- ing assembly was like that shown in Figure IB and 2B. The pump assembled to the plate was then rested atop a smooth table surface. When the pump was operating at its rated speed, the base plate 341 having the pump mounted thereto jumped relative to the table and also moved along the surface of the table in the lateral directions. The same observation was noted with a 30 liter pump which was series connected. The pump had a construction like that shown in figure 1. The base plate 341 was a ¼ inch thick and had a width and length to match the width and length of the pump in the same manner as the above described base plate 341. The experiment was also conducted with the above-described ten liter series pump like that shown in figure 3. The ten liter pump was connected to an aluminum base plate having a quarter inch thickness. The base plate was like the one above. The base plate had a length which approximated the length from the first vibration damping mounting assembly 74 at the pump housing first side 68 to the second vibration damping mounting assembly 80 at the motor second end 82. The base plate had a width which approximated the width of the pump from the pump housing third side 83 to the pump housing fourth side 85. The bottom of the plate was standard smooth aluminum. The pump was connected to the plate with a mounting assembly which embodies the features of the present invention. The mounting assembly was like that shown in figure 3. The pump assembled to the plate was then rested atop a smooth table surface. When the pump was operating at its rated speed, the base plate having the pump mounted thereto did not jump relative to the table. Also the base plate did not move along the surface of the table. The same observation was noted with a 30 liter pump which was series connected. The pump had a construction like that shown in figure 3. The base plate was a ¼ inch thick and had a width and length to match the width and length of the pump in the same manner as the above described base plate.

Figures 3-4, and 6 show an example of a construction of a vibration damping mounting assembly which embodies the features of the present invention. The first vibration damping mounting assembly 74 includes a first coupling 140 which connects a first end 141 of said first vibration damping mounting assembly 74 to the base 64. The first end 141 is fixedly coupled to the base 64. The first vibration damping mounting assembly 74 also includes a second coupling 142 which connects a second end 143 of said first vibration damping mounting assembly 74 to said pump housing 76. The second end 143 is fixedly coupled to the pump housing 76. The connection is at said first side 68 of said pump housing 76.

The first vibration damping mounting assembly 74 further includes a first support 144 which is coupled to said base 64. The coupling to the base is at a first end 146 of said first support 144. The first end 146 is coupled to the base 64 by said 140 first coupling. The first end 146 is fixedly coupled to the base 64. The first end 146 of the support 144 is connected to the first coupling 140. Said first coupling 140 is coupled to said base 64. The first coupling 140 is a fastener such as a screw which extends through an aper- ture 148 of the base 64 into an aperture 150 in the first end 146 of the first support 144. Said first end 146 of said first support 144 is at said first end

141 of said first vibration damping assembly 74. The first support 144 has a second end 152. The second end 152 is opposite the first end 146. The second end 152 of the support 144 is coupled to the pump housing 76. The second end 152 is coupled to the pump housing 76 by the second coupling 142. The second end 152 is fixedly coupled to the pump housing 76. The second end 152 of the first support 144 is connected to the second coupling 142. The second coupling 142 is connected to the pump housing 76. The second coupling 142 is fixedly coupled to the pump housing 76. The connection is at the first side 68 of the pump housing. The second coupling

142 includes a bracket 154 which extends outward from the pump housing first side 68 in the direction of the pump shaft 102. The bracket 154 has an aperture 156 therein in which a fastener 158 couples the support's 144 sec- ond end 152 to the bracket 154. The first support 144 is thus between a surface of the base 64 and a surface of the bracket 154. There are no rotatable or pivoting joints coupling the pump housing to the first support 144 or the first vibration damping mounting assembly 74. When the pump is mounted to the base by the vibration damping mounting assembly and the pump is in a resting position such as that shown in figure 9 A, the first support 144 has a particular alignment relative to the pump 58. The first support 144, when the pump is at rest, is aligned so that it is perpendicular to the first axis, perpendicular to the pump shaft axis of rotation 160, parallel to the second axis, and in line with the pump shaft axis of rotation 160. Further it is parallel to and intersected by the first plane. Further it is perpendicular to the second plane. A portion 162 of the first support 144 is moveable relative to the base 64 when installed as part of the vibration damping assembly 66 connecting the pump 58 to the base 64. The portion 162 of the first support 144 that is moveable is moveable at the second end 152. The portion 162 can also be adjacent the second end 152 of the first support 144. The portion 162 that is moveable is moveable relative to the base 64 in the positive and negative X direction; the positive and negative Y direction; and it may also be compressed and expanded in the positive and negative Z direction. The moveable portion 162 is moveable and moves relative to the base 64 during start up and operation of the pump at its rated speed to permit movement of the first point 1 10 along its arcuate path, the second point 1 12 along its arcuate path and the third point 1 14 along its arcuate path. The third point 1 14 has the pendulum movement relative to the second plane 104. The pump shaft also moves along an arcuate path and has a pendulum movement relative to the second plane 104. The first and second points 1 10, 1 12 move in the negative and positive direction. The portion 162 is moveable in a manner to enable the second axis 108 to tilt in a first direction relative to the first plane 106 axis when point 1 10 or 1 12 moves in the negative direction and tilt in a second opposite direction relative to the first plane 106 when point 1 10 or 1 12 moves in the positive direction. The first support's 144 moveable portion 162 is aligned so that, when the pump is at rest, it is perpendicular to the first axis 92, perpendicular to the pump shaft axis of rotation 160, in line with the pump shaft axis of rotation 160, and parallel to the second axis 108. Further it is parallel to and intersected by the first plane 106. Further it is perpendicular to the second plane 104. The first support 144 of the present embodiment, including the moveable portion 162, is made of elastomeric material. The first support 144, including the moveable portion 162, has the shape of a cylinder. The second vibration damping mounting assembly 80 includes a first coupling 164 which connects a first end 166 of said second vibration damping mounting assembly 80 to the base 64. The first end 166 is fixedly coupled to the base 64. The second vibration damping mounting assembly 80 also includes a second coupling 168 which connects a second end 170 of said second vibration mounting assembly 80 to said motor 62. The second end 170 is fixedly coupled to the motor 62. The coupling 168 is at the motor second end 82. The second vibration damping mounting assembly 80 further includes a second support 172 which is coupled by said first coupling 164 to said base 64 at a first end 174 of said second support 172. The first end 174 of the second support 172 is connected to the first coupling 164. Said first coupling 164 is coupled to said base 64. The first end 174 of the second sup- port 172 is fixedly coupled to the base. The first coupling 164 is a fastener such as a screw which extends through and aperture 176 of the base 64 into an aperture 178 in the first end 174 of the second support 172. Said first end 174 of said second support 172 is at said first end 164 of said second vibration damping assembly 80. The second support 172 has a second end 180. The second end 180 is opposite the first end 164. The second end 180 of the second support 172 is coupled by the second coupling 168 to the motor 62. The coupling is at the motor second end 82. The second end 180 of the support 172 is connected to the second coupling 168. The second coupling 168 is connected to the motor 62. The coupling 168 is connected to the motor 62 at the second end 82 of the motor 62. The second end 82 of the second support 172 is fixedly coupled to the motor 62. The second coupling 168 is fixedly coupled to the motor 62. The second coupling 168 includes a bracket 182 which extends outward from the motor second end 82 in the direction of the motor shaft 185. The bracket 182 has an aperture 184 therein in which a fastener 186 couples the support second end 180 to the bracket. The second support 172 is thus between a surface of the base 64 and a surface of the bracket 182. There are no rotatable or pivoting joints coupling the motor 62 to the second support 172 or the second vibra- tion damping mounting assembly 80.

When the pump 58 is mounted to the base 64 by the vibration damping mounting assembly and the pump 58 is in a resting position such as that shown in figure 9A, the second support 172 has a particular alignment rela- tive to the pump 58. The second support 172, when the pump 58 is at rest, is aligned so that it is perpendicular to the first axis 92, perpendicular to the motor shaft axis of rotation 190, parallel to the second axis 108, and in line with the motor shaft axis of rotation 190. Further it is parallel to and intersected by the first plane 106. Further it is perpendicular to the second plane 104.

A portion 188 of the second support 172 is moveable relative to the base 64 when installed as part of the vibration damping assembly 66 connecting the pump 58 to the base 64. The portion 188 of the second support 172 that is moveable is moveable at the second end 180 of the support 172. The portion can also be adjacent the second end 180. The portion 188 of the second support 172 is moveable relative to the base 64 in the positive and negative X direction; the positive and negative Y direction; and it may also be compressed and expanded in the positive and negative Z direction. The portion 188 of the support 172 which is moveable is moveable and moves relative to the base 64 during start up and operation of the pump 58 at its rated speed to permit some rotational movement of the motor housing relative to the base 64. The second support moveable portion 188 is aligned so that, when the pump is at rest, it is perpendicular to the first axis, perpendicular to the motor shaft axis of rotation 190, in line with the motor shaft axis of rotation 190 and parallel to the second axis 108. Further it is parallel to and intersected by the first plane 106. Further it is perpendicular to the second plane 104. The second support 172 of the present embodiment, including the moveable portion 188, is made of elastomeric material. The second support 172, including the moveable portion 168, has the shape of a cylinder.

The following describes in more detail the motor 62 and pumping assembly 66 discussed above. In more detail the pumping assembly 66 is a dual diaphragm assembly of a known construction.

The rotation of the motor shaft 185 rotates the pump shaft 102. In the shown embodiment the motor shaft and pump shaft 102 are integral and form one single continuous shaft. The pump shaft 102 can also be called a crankshaft. Rotation of the pump shaft 102 by the motor shaft 185 causes first reciprocating assembly 96 and second reciprocating assembly 100 to reciprocate along a path. The reciprocation causes diaphragms 192, 194 mounted at first ends 196,198 of connecting rods 200, 202 of first and sec- ond reciprocating assemblies 96, 100 to move away from internal surfaces 212, 214 forming boundaries of working chambers 208, 210. As the perimeters 204, 206 of each diaphragm 192, 194 are fixed relative to the pump housing 76, forming the pumping assembly 60, the movement of the diaphragms occurs at the portion not fixed. The portion not fixed moves away from internal surfaces 212, 214. The movement causes an expansion of working chambers 208, 210 formed between internal surfaces 212, 214 and diaphragms 192, 194. The movement which creates the expansion of the working chambers 208, 210 is caused by the first ends 196, 198 of each connecting rod moving in a first direction away from internal surfaces 212, 214 and towards pump shaft 102. When the center point 94, 98 of each of each reciprocating assembly 96,100 which is at the first ends 196, 198 of each connecting rod 200, 202, moves to a point during its cycle of reciprocation, where it is closest to the pump shaft 102, the connecting rods 200,202 are in a bottom dead center position. The reciprocating assemblies shown are in the bottom dead center position. As the pump shaft 102 continues to rotate, each connecting rod 200, 202 moves from its bottom dead center position towards a top dead center position. Each connecting rod 200, 202 is in a top dead center position when the center point 94, 98 at each connecting rod's first end 196, 198 is furthest away from the pump shaft 102. As each center point 94, 96 moves from the bottom dead center position to the top dead center position, the diaphragms 192, 194 move towards the internal surfaces 212, 214 defining the working chambers 208, 210. The movement causes the volume in the working chambers 208, 210 to decrease. Thus, as the connecting rods 200, 202 of the reciprocating assemblies 96, 100 reciprocate between a top dead center position and a bottom dead center position, the volume of the working chambers 208, 210 defined by the internal surfaces 212, 214 and diaphragms 192, 194 expands and contracts. During an expansion fluid is drawn into the working cham- bers 208, 210. During a contraction fluid is expelled from the working chambers 208, 210. Portions of the diaphragms 192, 194 can be considered themselves to be reciprocating towards and away from the pump shaft 102 during a reciprocation of the connecting rods 200, 202. Accordingly, the reciprocating assemblies 96, 100 can be considered to include the dia- phragm coupled to the connecting rods. The reciprocation of each connecting rod 200, 202 is caused by eccentrics 122, 123. Each eccentric 122, 123 is coupled to pump shaft 102. Eccentric 122 is coupled to connecting rod 200 and eccentric 123 is coupled to connecting rod 202. As the shaft 102 rotates each eccentric 122, 123 rotates, causing the connecting rod to which it is coupled to reciprocate between a top dead center position and a bottom dead center position.

In more detail the pumping assembly 60 includes pump housing 76. The pump housing 76 includes case 78 which can be called the crank case. The case 78 forms first side 68 of pumping assembly 60. The case 78 carries first pump head 84 which includes cover 86. The first pump head 84 forms the third side 83. The first pump head 84 forms an internal inlet chamber and an internal outlet chamber. Between the case 78 and the first pump head 84 is a first valve plate 216. The first valve plate 216 carries a valve or valves or valving 218 which regulates the flow of fluid from the internal inlet chamber into the working chamber 208 and from the working chamber 208 into the internal outlet chamber. The case 78 also carries second pump head 88 which includes cover 90. The second pump head 88 forms the fourth side 85. The second pump head 88 forms an internal inlet chamber and an internal outlet chamber. Between the case 78 and the second pump head 88 is a second valve plate 220. The second valve plate 220 carries a valve or valves or valving 222 which regu- lates the flow of fluid from the internal inlet chamber into the working chamber 210 and from the working chamber 210 into the internal outlet chamber.

As discussed above the movement, of components of the pump 58 relative to the pump housing 76 creates forces which the vibration damping mounting assembly 66 absorbs. When the pump 58 is operating at its rated speed the majority of forces transmitted by rotation of the motor shaft 185, pump shaft 102, eccentrics 122, 123, and the orbiting portion 124, 125 of the reciprocating assemblies in which the eccentrics are disposed, are absorbed by the vibration damping mounting assembly 66 without being transferred to the base 64 along vectors which are parallel to the first 106 and second 104 planes.

Claims

Arrangement comprising a pump (58) and a vibration damping mounting assembly (66);

a) wherein said pump (58) has a pumping assembly (60) and a motor (62) coupled to said pumping assembly (60);

b) wherein said pumping assembly (60) has a pump housing (54), a pump shaft (102) extending into said pump housing (54), a first reciprocating assembly (96) coupled to said pump shaft (102), and a first working chamber (208);

c) wherein said vibration damping mounting assembly (66) has a first vibration damping mounting assembly (74);

d) wherein said first vibration damping mounting assembly (74) has a first support (144)

e) the one end (146) of which is coupled to said pump housing (54); f) which has a moveable portion (162) which is moveable in the

negative and positive x and y directions relative to a base (64) when said pump (58) is coupled to said base (64);

g) wherein said pump shaft (102) has a pump shaft axis of rotation (160) and wherein rotation of said shaft (102) when said pump (58) is operating at its rated speed, reciprocates said first reciprocating assembly (96) along a path, said reciprocation causing a volume of said first working chamber (208) to expand and contract;

h) wherein said arrangement further comprises:

i) a point on said pump housing (54) which oscillates along an arcuate path when said pump (58) is operating at said rated speed and said pump (58) is coupled to said base (64) by said vibration damping mounting assembly (66). Arrangement according to claim 1 , characterized in that said point has a pendulum movement relative to a first plane (106) when said pump (58) is operating at said rated speed and said pump (58) is coupled to said base (64) by said vibration damping mounting assembly (66), said first plane (106) intersects said pump shaft (102) and is parallel to said pump shaft (102), and perpendicular to a second plane (104), said second plane (104) intersects said pump shaft (102) and is parallel thereto.

Arrangement according to claim 1 or 2, characterized in that said pump (58) further comprises an eccentric (122, 123) coupled to said pump shaft (102) and a portion of said reciprocating assembly (96, 100); wherein during rotation of said pump shaft (102), said portion of said reciprocating assembly (96, 100) orbits about said eccentric (122, 123); and wherein

a majority of the forces caused by the rotation of the pump shaft (102), rotation of the eccentric (122, 123), and orbiting of the coupling portion are absorbed by the vibration damping mounting assembly (66) without being transferred to said base (64) along vectors extending in the positive and negative x, y, and z directions.

Arrangement according to one of the preceding claims, characterized in that:

when said pump (58) is at rest said moveable portion (162) is in line with said pump shaft axis of rotation (160).

5. Arrangement according to one of the preceding claims, characterized in that the vibration damping mounting assembly (66) has the first vibration damping mounting assembly (74) at a first side (68) of the pumping assembly (60) and a second vibration damping mounting assembly (80) at an end (82) of the motor (62), wherein the first side (68) and the end (82) are opposite ends of the pump (58),

6. Arrangement according to one of the preceding claims, characterized in that the first vibration damping mounting assembly (74) comprises a first coupling (140) which connects a first end (141) of the first vibration damping mounting assembly (74) to the base (64).

7. Arrangement according to one of the preceding claims, characterized in that the first vibration damping mounting assembly (74) further comprises a second coupling (142) which connects a second end (143) of the first vibration damping mounting assembly (74) with a pump housing (76) of the pump (58).

8. Arrangement according to one of the preceding claims, characterized in that the first support (144) is in the shape of a cylinder.

9. Arrangement according to one of the preceding claims, characterized in that the first support (144) is made of elastomeric material.

10. Arrangement according to one of the preceding claims, characterized in that the vertical length of the first support (144) is changeable.

1 1. Arrangement according to claim 5, characterized in that the second vibration damping mounting assembly (80) comprises a first coupling (164) which connects a first end (166) of the second vibration damping mounting assembly (80) to the base (64).

12. Arrangement according to claim 5 or 1 1, characterized in that the second vibration damping mounting assembly (80) further comprises a second coupling (168) which connects a second end (170) of the second vibration damping mounting assembly (80) to the motor (62) of the pump (58).

13. Arrangement according to claim 5, 1 1 or 12, characterized in

that, the second vibration damping mounting assembly (80) further comprises a second support (172) which is in the shape of a cylinder. 14. Arrangement according to claim 13, characterized in that the second support (172) is made of elastomeric material.

15. Arrangement according to claim 13 or 14, characterized in that the vertical length of the second support (172) is changeable.