KR20020047133A - Airless spray pump - Google Patents

Abstract

The inorganic spray pump 10 of this invention is equipped with the single-acting piston pump which makes it possible to use the low cost yoke 30 drive part. The motor and pump shafts are offset for the most efficient use of force.

Description

Inorganic spray pump {AIRLESS SPRAY PUMP}

Inorganic spray pumps for spraying paint and other coatings via the inorganic method are well known and traditionally classified into two types: lower market diaphragm pumps and upper market reciprocating piston pumps.

The present invention relates to an airless spray pump for spraying paint and other coatings.

1 is an exploded perspective view showing an inorganic spray pump of the present invention.

2 is a simplified plan view of the drive assembly and pump of the present invention.

3 is a side view of the assembly shown in FIG.

4 is an exploded view of the circular section of FIG. 3;

5 is a cross-sectional view of the pump of the present invention.

Figure 6 shows details of the drive assembly of the present invention.

Figure 7 is another cross-sectional view of the pump portion of the present invention.

8 is a sectional view of an outlet filter of the present invention.

9 is an exploded view of an outlet filter of the present invention.

10 is an exploded perspective view of the present invention.

The inorganic spray pump is equipped with a single-acting piston pump that enables the use of low cost yoke drives. The motor and pump shafts are offset for the most efficient use of force. The main drive housing has a motor mounted behind it. The gear assembly utilizes a gear tooth having a helical angle of 5 ° and a pressure angle of 25 °. This geometry combines a high efficiency linear cutting gear with a noise reduction form represented by a helical design.

The eccentric is disposed around the bearing assembly which is molded on the front of the gear assembly and rests inside the yoke. The yoke moves vertically on a guide rod held in a pocket of the drive housing. The yoke is molded from plastic like a gear assembly, resulting in less costly and easier fabrication.

The pump rod has a cap with a bearing on its upper end. The pump assembly is designed as a single-acting pump, ie a pump that is only pumped on the down stroke and loaded on the up stroke. This can make the components of the drive train comprising the yoke and gears much lighter when the yoke forms an end and is a guide rather than a force-applying device.

The motor and pinion are offset from the center line of the pump assembly. This arrangement will not have any significant cantilever when the pump rods, pinions, yokes, eccentrics and caps are all coplanar. The arrangement of the single-acting pump and rod relative to the gear centerline will reduce the thrust load on the yoke. The position of the pinion on the gear is partially offset to reduce the pumping force on the gear shaft and the bearing. By placing the eccentric bearing directly on the end of the press-fitted pump rod cap, it eliminates the transfer of pumping force through an intermediate member, such as a yoke, which provides longer life and efficiency, thus allowing the manufacture of a less expensive yoke assembly. Let's do it.

The shaft packing assembly consists of a packing housing including a felt member that is screwed into the pump housing and wetted with a throat seal lubricant or other solvent or lubricant. Laminated v-packing is compressed in place by a wave spring that is tightened by tightening the seal housing into the pump housing.

The inlet check has a check seat and a check ball that are pressed into the check housing and held in place by the retainer. All of these parts are press fit together so that the complete assembly is only screwed into the main pump housing for replacement. Likewise, the outlet check assembly is formed from an outlet check housing that is likewise equipped with a check ball that is screwed into the pump housing and held in place by a retainer. The outlet passage is inclined with respect to the axis of the pump shaft. This inherently enables the outlet check assembly to operate via gravity and requires only drilling and provision of one passage while maintaining the original vertical ball-sheet relationship.

Other objects and advantages of the present invention are better understood from the following description taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views.

The pump 10 of the present invention consists of a main drive housing 12 with a motor 14 mounted behind it. The gear assembly 16 with the rear bearing 17 and the gear teeth 22 is inserted into the bearing housing 20 of the drive housing 12. Gear teeth 22 on gear assembly 16 mate with teeth on pinion 24 on the end of motor 14. Teeth 22 on pinion 24 have a helical angle of 5 ° and a pressure angle of 25 °. This geometry combines a high efficiency linear cutting gear with a noise reduction form represented by a helical design.

The eccentric 25 is disposed around the bearing assembly 28 which is also molded on the front of the gear assembly 16 and placed inside the yoke 30. Yoke 30 moves vertically on guide rod 32 held in pocket 34 of drive housing 12. Yoke 30 is molded from plastic. The gear assembly 16 is cast with ZA-12 together with the integral counterweight, resulting in less costly and easier fabrication.

The pump rod 36 has a cap 38 with a bearing 28 on its upper end. The pump assembly 40 is designed as a single-acting pump, ie a pump that is only pumped on the down stroke and loaded on the up stroke. In doing so it can make the components of the drive train comprising the yoke and gears much lighter when the yoke 30 forms an end and is a guide device rather than a force-applying device.

As can be seen in particular in FIG. 2, the motor and pinion 24 are offset from the centerline 42 of the pump assembly 40 which is also offset in the opposite direction from the bearing 20. In addition, this arrangement will not have any significant cantilever when the pump rods, pinions, yokes, eccentrics and caps are all coplanar. The arrangement of the single-acting pump and rod relative to the gear centerline will reduce the thrust load on the yoke. The position of the pinion on the gear is partially offset to reduce the pumping force on the gear shaft and the bearing. By placing the eccentric bearing directly on the end of the press-fitted pump rod cap, eliminating the transfer of pumping force through an intermediate member, such as a yoke, which provides longer life and efficiency, thereby making less expensive yoke assemblies manufactured. Let's do it.

The shaft packing assembly 44 shown in FIG. 4 consists of a packing housing 46 that includes a felt member 50 that is screwed into the pump housing 48 and wetted with a throw seal lubricant or other solvent or lubricant. The laminated v-packing 52 is compressed in place by the wave spring 54 which is tightened by tightening the seal housing 46 into the pump housing 48.

Returning to FIG. 7, the inlet check 56 has a check seat 60 and a check ball 58 that are pressed into the check housing 62 and held in place by the retainer and the integral ball guide 64. All of these parts are press fit together so that the complete assembly is only screwed into the main pump housing 48 for replacement. Likewise, the outlet check assembly is formed of an outlet check housing 60 which likewise has a check ball 62 which is screwed into the pump housing 48 and held in place by the ball seat 65. As can also be seen in FIG. 7, the outlet passage 66 is inclined with respect to the axis of the pump shaft 36. This inherently requires the exit check assembly 58 to operate via gravity and still only require drilling and provision of one passageway while maintaining the original vertical ball-sheet relationship.

8 and 9 illustrate an outlet filter assembly 80 consisting of filter elements 82 contained within the passageway 84 of the pump assembly 40 and held by the fixture 86.

Returning to Fig. 10, the inlet tube 70 has a female threaded end 70a. Inlet filter screen assembly 72 has a male threaded end 72a that is threadedly coupled to end 70a. The ends 70a, 72a use threads of the same size as the common garden hose to allow the user to simply remove the screen assembly 72 and attach the garden hose to the inlet tube 70 and run tap water to flush the assembly with water.

It will be appreciated that various changes and modifications can be made to the inorganic spray pump of the present invention without departing from the spirit and scope of the invention as defined in the following claims.

Claims (5)

A spray pump powered by a rotating motor having a pinion thereon, Housings, A single-acting piston pump having a pump rod and connected to the housing; A drive gear assembly comprising a gear and an eccentric disposed on the gear; A bearing disposed around the eccentric, A yoke reciprocally disposed around the bearing in the housing, And a relatively rigid cap disposed on the pump rod in the yoke to contact the bearing. The spray pump of claim 1, wherein the pump rods, pinions, yokes, eccentrics, and caps are all generally disposed in the same plane. The spray pump of claim 1, wherein the teeth on the gear have a helical angle of about 5 ° and a pressure angle of about 25 °. The spray pump of claim 1, wherein the motor and pinion are offset from the centerline of the pump to reduce the thrust load on the yoke and reduce the offset and pumping force of the pumping force. An inorganic spray pump having an inlet tube and an inlet filter screen, The inlet tube has a female threaded end, and the inlet filter screen assembly has a male threaded end that is threadedly coupled with the female end, the ends having the user simply removing the screen assembly and attaching a garden hose to the inlet tube. And a thread of the same size as the common garden hose to attach to and clean the assembly.