System and method for priming a pump

• US 9,828,987 B2
• Filed: 01/30/2015
• Issued: 11/28/2017
• Est. Priority Date: 01/30/2015
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Steffen, Joshua Wayne, Brown, Cory Andrew
• Primary Examiner(s): KRAMER, DEVON C
• Assistant Examiner(s): Doyle, Benjamin
• Application Number:
  US14/610,264
• Publication Number:
  US 20160222958A1
• Time in Patent Office: 1,033 Days
• Field of Search: 123448, 123450, 123445, 123446, 123447, 123449, 123451, 123452, 1375653, 62 506, 4171992, 417270, 417307
• CPC Class Codes: F02M 21/0215 Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
• CPC Class Codes: F02M 21/0245 High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
• CPC Class Codes: F02M 21/0287 characterised by the transition from liquid to gaseous phase F02M21/06 takes precedence; Injection in liquid phase; Cooling and low temperature storage
• CPC Class Codes: F02M 59/025 characterised by a single piston
• CPC Class Codes: F02M 59/38 Pumps characterised by adaptations to special uses or conditions
• CPC Class Codes: F04B 1/14 having stationary cylinders
• CPC Class Codes: F04B 15/08 the liquids having low boiling points
• CPC Class Codes: F04B 2015/081 Liquefied gases
• CPC Class Codes: F04B 23/02 having reservoirs
• CPC Class Codes: F04B 23/021 the pump being immersed in the reservoir
• CPC Class Codes: F04B 23/06 the pumps being all of reciprocating positive-displacement type
• CPC Class Codes: F04B 49/02 Stopping, starting, unloading or idling control
• CPC Class Codes: F04B 49/24 Bypassing
• CPC Class Codes: F04B 53/08 Cooling; Heating; Preventing freezing
• CPC Class Codes: F04B 53/10 Valves; Arrangement of valves
• CPC Class Codes: Y02T 10/30 Use of alternative fuels, e.g. biofuels

Abstract

A pump includes a reservoir configured to receive a fluid pressurized by a boost pump. The pump also includes at least one pumping mechanism configured to receive a first flow of fluid from the reservoir and direct the first flow of fluid into a discharge passage of the pump without pumping the first flow of fluid when priming the pump. The at least one pumping mechanism is disposed in the reservoir such that the fluid in the reservoir surrounds at least a portion of the at least one pumping mechanism. The discharge passage is configured to output the first flow of fluid from the pump. The pump further includes a bypass passage configured to communicate a second flow of fluid from the reservoir to the storage tank.

Claims

1. A pump comprising:

a reservoir configured to receive a fluid pressurized at a first pressure by a boost pump;

at least one pumping mechanism including a drive mechanism and an outlet check valve, the at least one pumping mechanism being configured to receive a first flow of fluid from the reservoir and direct the first flow of fluid into a discharge passage of the pump without pressurizing the first flow of fluid above the first pressure when priming the pump, the at least one pumping mechanism being disposed in the reservoir such that the fluid in the reservoir surrounds at least a portion of the at least one pumping mechanism, the discharge passage being configured to output the first flow of fluid from the pump, the outlet check valve being configured to close preventing the first flow of fluid when a pressure in the discharge passage is substantially equal to the first pressure;

a bypass passage configured to communicate a second flow of fluid from the reservoir to a storage tank; and

a sensor configured to determine a temperature associated with the pump, the sensor being in communication with a controller, when the determined temperature is equal to or below a threshold temperature the controller is configured to stop riming the pump by starting the drive mechanism so that the at least one pumping mechanism begins pressurizing the first flow of fluid from the reservoir into the discharge passage at a second pressure greater than the first pressure.

2. The pump of claim 1, wherein the at least one pumping mechanism includes a plurality of pumping mechanisms disposed in the reservoir such that the fluid in the reservoir surrounds at least a portion of an outer surface of each of the pumping mechanisms, each of the pumping mechanisms being configured to pump the fluid from the reservoir to the discharge passage after priming the pump.

3. The pump of claim 1, wherein the at least one pumping mechanism includes a first end, a second end, at least one inlet passage, and an outlet passage, the at least one inlet passage having at least one inlet adjacent the first end and configured to receive the fluid from the reservoir, and the outlet passage having an outlet adjacent the second end configured to output the first flow of fluid.

4. The pump of claim 3, wherein the at least one pumping mechanism includes an outlet check valve configured to close, thereby preventing flow through the outlet passage when a pressure of the fluid in the discharge passage is substantially equal to a pressure of the fluid supplied to the at least one pumping mechanism.

5. The pump of claim 4, wherein:

the at least one pumping mechanism includes a plunger and a plunger bore in a barrel assembly, the plunger being configured to slide within the plunger bore;

the outlet passage is fluidly connected to the plunger bore via the outlet check valve; and

the inlet passage is fluidly connected to the plunger bore via an inlet check valve.

6. A pump priming system comprising:

a boost pump configured to pressurize at a first pressure a fluid supplied from a storage tank;

a pump assembly including;

a reservoir configured to receive the fluid from the boost pump, at least one pumping mechanism including a drive mechanism and an outlet check valve, the at least one pumping mechanism configured to receive a first flow of fluid from the reservoir and direct the first flow of fluid into a discharge passage of the pump without pressurizing the first flow of fluid above the first pressure when priming the pump, the outlet check valve being configured to close preventing the first flow of fluid when a pressure in the discharge passage is substantially equal to the first pressure, a bypass passage configured to communicate a second flow of fluid from the reservoir to the storage tank, wherein the first flow of the pressurized fluid stops flowing into the discharge passage when a pressure of the fluid in the discharge passage is substantially equal to a pressure of the fluid in the reservoir; and

a sensor configured to determine a temperature associated with the pump, the sensor being in communication with a controller, when the determined temperature is equal to or below a threshold temperature the controller is configured to stop priming the pump by starting the drive mechanism so that the at least one pumping mechanism begins pressurizing the first flow of fluid from the reservoir into the discharge passage at a second pressure greater than the first pressure.

7. The pump priming system of claim 6, wherein the sensor is configured to determine the temperature of the fluid communicated from the reservoir to the storage tank.

8. The pump priming system of claim 6, wherein the at least one pumping mechanism includes a plurality of pumping mechanisms disposed in the reservoir such that the fluid in the reservoir surrounds at least a portion of an outer surface of each of the pumping mechanisms, and each of the pumping mechanisms is configured to pump the first flow of fluid from the reservoir to the discharge passage after priming the pump.

9. The pump priming system of claim 6, further including an accumulator fluidly connected to the discharge passage of the pump and configured to receive the first flow of fluid from the discharge passage.

10. The pump priming system of claim 6, wherein the at least one pumping mechanism is disposed in the reservoir such that the fluid from the storage tank surrounds at least a portion of the at least one pumping mechanism.

11. The pump priming system of claim 6, wherein the at least one pumping mechanism includes a first end, a second end, at least one inlet passage, and an outlet passage, the at least one inlet passage having at least one inlet adjacent the first end and configured to receive the fluid from the reservoir, and the outlet passage having an outlet adjacent the second end configured to output the first flow of fluid.

12. The pump priming system of claim 11, wherein the at least one pumping mechanism includes an outlet check valve configured to close, thereby preventing flow through the outlet passage when the pressure of the fluid in the discharge passage is substantially equal to the pressure of the fluid in the reservoir.

13. The pump priming system of claim 12, wherein:

the at least one pumping mechanism includes a plunger and a plunger bore in a barrel assembly, the plunger being configured to slide within the plunger bore;

the outlet passage is fluidly connected to the plunger bore via the outlet check valve; and

the inlet passage is fluidly connected to the plunger bore via an inlet check valve.

14. A method for priming a pump, the method comprising:

supplying a fluid from a storage tank to a reservoir of the pump at a first pressure using a boost pump;

communicating a first flow of fluid from the reservoir through at least one pumping mechanism of the pump into a discharge passage of the pump without pressurizing the first flow of fluid above the first pressure until a pressure of the fluid in the discharge passage is substantially equal to a pressure of the fluid supplied to the at least one pumping mechanism, thereby closing a check valve stopping the first flow of the fluid into the discharge passage;

sensing a temperature of a fluid associated with the pump;

communicating a second flow of fluid from the reservoir to the storage tank when the first flow of fluid stops flowing from the at least one pumping mechanism into the discharge passage;

communicating the sensed temperature to a controller in communication with a drive mechanism for the at least one pumping element; and

operating, by the controller, the drive mechanism for the at least one pumping mechanism when the determined temperature is equal to or below a threshold temperature to stop priming the pump and to pressurize the first flow of fluid into the discharge passage at a second pressure greater than the first pressure.

15. The method of claim 14, wherein the first flow of fluid is communicated from the discharge passage to an accumulator when the pressure of the fluid in the discharge passage is less than the pressure of the fluid supplied to the at least one pumping mechanism.

16. The method of claim 14, wherein the pressure of the fluid supplied to the at least one pumping mechanism is a pressure in the reservoir.

17. The method of claim 14, wherein the pressure of the fluid in the discharge passage is substantially equal to the pressure of the fluid supplied to the at least one pumping mechanism when an amount of fuel accumulates downstream of the pump sufficient to stop additional fuel from flowing into the discharge passage.

18. The method of claim 14, further comprising communicating the pressurized fluid from the discharge passage to an engine via a discharge line when the determined temperature is less than the threshold temperature, the discharge line fluidly connecting the pump to the engine.