Mounting base and assembly for pressure sensor, filter and pressure relief valve

• US 5,192,425 A
• Filed: 07/22/1991
• Issued: 03/09/1993
• Est. Priority Date: 07/22/1991
• Status: Expired due to Term

• Current Assignee: Wagner Spray Tech Corporation (Wagner Holdings, Inc.)
• Original Assignee: Wagner Spray Tech Corporation (Wagner Holdings, Inc.)
• Inventors: Straight, Dwaine D., Cooper, Robert D. Jr., Cyphers, Norman A.
• Primary Examiner(s): Drodge, Joseph W.
• Application Number:
  US07/733,226
• Time in Patent Office: 596 Days
• Field of Search: 210/90, 210/133, 210/420, 222/61, 222/189, 222/396, 222/400.7, 239/590.3, 239/590.5, 239/DIG. 14, 401/188 R, 417/305, 417/307-309, 417/388, 73/720, 73/756, 29/451, 29/456, 29/458, 29/525.1, 29/741
• US Class Current: 210/90
• CPC Class Codes: B01D 2201/0461 Springs
• CPC Class Codes: B01D 29/15 arranged for inward flow filtration
• CPC Class Codes: B01D 29/606 by pressure measuring
• CPC Class Codes: B01D 29/90 for feeding
• CPC Class Codes: Y10S 239/14 Paint sprayers
• CPC Class Codes: Y10T 29/49872 Confining elastic part in socket
• CPC Class Codes: Y10T 29/49881 of separate helix [e.g., screw thread]
• CPC Class Codes: Y10T 29/53183 Multilead component

Abstract

Single-piece manifold for use in pressurized painting equipment which is configured and arranged for joining a liquid inlet line, a pressure sensor, a filter, a pressure relief valve, and one or more liquid outlet lines by a streamlined network of passages in a compact and organized manner which eliminates static flow areas. The pressure sensor is assembled within the manifold in such manner as to avoid relative rotation between sensor components and thus avoid stressing electrical leads of the sensor.

Claims

1. A combined pressure sensor and filter assembly for pressurized painting systems comprising:

a) a strain gage type pressure sensor for transducing pressure in a paint supply line;

b) a cylindrical filter having an upstream side and a downstream side and located downstream from the pressure sensor for removing particulates from paint in the paint supply line;

c) a pressure relief valve located upstream of the filter for limiting pressure in the paint supply line from rising above a predetermined maximum pressure;

d) a base formed of a single block of metal and having a plurality of faces on the exterior thereof and carrying the pressure sensor, filter and pressure relief valve and wherein the base has

i) a first straight bore extending through first and second faces of the base and forming an inlet port at an upstream end thereof in the first face and a pressure relief valve mounting port receiving and mounting the pressure relief valve therein at a downstream end of the first bore in the second face,

ii) a second bore extending from a third face into the base transverse to and intersecting the first bore, the second bore forming a pressure sensor mounting port,

iii) a third bore extending from a fourth face into the base transverse to the first bore and having at least one channel communicating between the first and third bores and wherein the third bore forms a filter mounting port such that the channel is in communication with the upstream side of the filter, and

iv) a fourth bore extending from a fifth face into the base forming a paint outlet port and communicating with the downstream side of the filter

wherein the flow path from the inlet path past the pressure sensor is relatively streamlined such that paint solids are carried away from the pressure sensor when a solvent is flushed through the base.

2. The assembly of claim 1 wherein the base further comprises

v) a fifth bore extending from a sixth face into the base and intersecting the downstream end of the first bore and forming a pressure relief outlet port.

3. The assembly of claim 2 wherein the base further comprises a plurality of paint outlet ports, each communicating with a downstream side of the filter.

4. An assembly for directing and controlling fluid flow in a pressurized painting systems comprising:

(a) a single-piece body having (i) a paint inlet port,

(ii) a first paint outlet port, (iii) a pressure sensor mounting port downstream of the paint inlet port, (iv) a filter mounting port downstream of the pressure sensor mounting port, (v) a pressure relief mounting port linearly opposed to the paint inlet port, and (vi) a network of passages interconnecting the paint inlet port, first paint outlet port, pressure sensing mounting port and filter mounting port which is effective for providing fluid communication therebetween and includes a first straight bore extending continuously from the paint inlet port to the pressure relief mounting port,

(b) a paint supply line in fluid communication with the paint inlet port,

(c) a first paint delivery line in fluid communication with the first paint outlet port,

(d) a filter effective for removing particulate material from paint in fluid communication with the filter mounting port,

(e) a pressure sensor in fluid communication with the pressure sensor mounting port which is effective for sensing the pressure within the network of passages at a point upstream of the filter and generating a signal proportional to the sensed pressure, and

(f) a pressure relief valve in fluid communication with the pressure relief mounting port effective for decreasing the pressure within the body by externally venting paint from the network of passages through the pressure relief mounting port whenever a predetermined maximum pressure is reached within the body.

5. The assembly of claim 4 further comprising a seal between the pressure sensor and the body.

6. The assembly of claim 5 wherein the seal comprises an O-ring.

7. The assembly of claim 5 wherein the pressure sensor further comprises compression means effective for sealingly urging the pressure sensor against the seal and the body.

8. The assembly of claim 7 wherein the network of passages includes a threaded pressure sensor retaining bore extending from the pressure sensor mounting port and the compression means comprises a threaded collar effective for threadable insertion in the threaded pressure sensor retaining bore so as to compress the pressure sensor against the seal.

9. The assembly of claim 8 further comprising securing means for securing the pressure sensor against rotation with respect to the threaded collar.

10. The assembly of claim 9 wherein the securing means comprises an adhesive effective for coupling the pressure sensor and the threaded collar into a unitary component.

11. The assembly of claim 4 wherein the pressure sensor comprises a strain gage patch bonded to a stainless steel element.

12. An assembly for directing and controlling fluid flow in a pressurized painting systems comprising:

(a) a single-piece manifold having (i) a fluid inlet port, (ii) a fluid outlet port, (iii) a pressure sensor mounting port downstream of the inlet port, and (vi) a network of passages interconnecting the inlet port, outlet port, and pressure sensing mounting port which is effective for providing fluid communication therebetween,

(b) a fluid supply line in fluid communication with the inlet port,

(c) a fluid delivery line in fluid communication with the outlet port, and

(d) a pressure sensor in fluid communication with the pressure sensor mounting port which is effective for sensing the pressure within the network of passages;

generating a signal proportional to the sensed pressure; and

transmitting the signal through an electrical lead extending from the pressure sensor,

(e) compression means effective for urging a distal end of the pressure sensor into a passage within the manifold through the pressure sensor mounting port and into sealing engagement with the manifold by rotation of the compression means;

the compression means being in physical communication with the electrical lead such that rotation of the compression means relative to the electrical lead effects a torsional stress upon the electrical lead, and

(f) securing means effective for preventing rotation between the pressure sensor and compression means during assembly and disassembly of the pressure sensor and compression means within the pressure sensor mounting port of the manifold.

13. The assembly of claim 12 further comprising a pressure relief mounting port in the manifold and a pressure relief valve in fluid communication with the pressure relief mounting port which is effective for decreasing the pressure within the manifold by externally venting fluid from the network of passages through the pressure relief mounting port whenever a predetermined maximum pressure is reached within the manifold.

14. The assembly of claim 13 wherein the network of passages includes a first bore extending continuously from the fluid inlet port to the pressure relief mounting port.

15. The assembly of claim 12 further comprising a filter mounting port in the manifold downstream from the pressure sensor port and a filter effective for removing particulate material from a fluid traveling through the manifold in fluid communication with the filter mounting port.

16. The assembly of claim 12 wherein (i) the network of passages includes a threaded pressure sensor retaining bore extending from the pressure sensor mounting port, and (ii) the compression means comprises a threaded collar effective for threadable insertion into the threaded pressure sensor retaining bore so as to sealingly compress a distal end of the pressure sensor against the manifold.