GB2147951A - Hydrostatic machine (pump or motor) - Google Patents

Hydrostatic machine (pump or motor) Download PDF

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Publication number
GB2147951A
GB2147951A GB08424941A GB8424941A GB2147951A GB 2147951 A GB2147951 A GB 2147951A GB 08424941 A GB08424941 A GB 08424941A GB 8424941 A GB8424941 A GB 8424941A GB 2147951 A GB2147951 A GB 2147951A
Authority
GB
United Kingdom
Prior art keywords
machine
pump
temperature
casing
temperature difference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB08424941A
Other versions
GB2147951B (en
GB8424941D0 (en
Inventor
Wilhelm Dworak
Martin Fader
Willy Mahl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB8424941D0 publication Critical patent/GB8424941D0/en
Publication of GB2147951A publication Critical patent/GB2147951A/en
Application granted granted Critical
Publication of GB2147951B publication Critical patent/GB2147951B/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/10—Inlet temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/11—Outlet temperature

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Rotary Pumps (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Hydraulic Motors (AREA)

Abstract

Temperature measurement devices e.g. thermocouples (A, B) or (A', B') are located at the inlet and outlet sides of the machine. The wear condition and efficiency can be determined from the temperature difference. The machine may be a conventional gear pump or motor (as shown). <IMAGE>

Description

SPECIFICATiON Hydrostatic machine (pump or motor) The wear condition of a hydrostatic machine can be recognised from its efficiency. This can in turn be determined from the temperature difference between the inlet and the outlet.
This is a very simple and cheap method of recognising and determining the wear condition and efficiency of a hydrostatic machine.
Thermocouples are particularly suitable as the temperature measuring device. It is desirable that the temperature difference should be indicated on an LCD indicator on the pump casing.
One embodiment example of the invention is shown in the drawing and is explained in more detail in the following description.
Figure 1 shows a gear pump in crosssection and Figure 2 shows an end view of a gear pump.
In Fig. 1, 10 shows the casing of a gear pump in which is located a casing recess 11 formed by two intersecting holes 1 2 and 1 3.
Two gear wheels 14 and 1 5 are in external engagement in the casing recess 11. They induce a pressure medium via an inlet hole 1 6 and displace this into an outlet hole 1 7. A thermocouple A or A' is located in the inlet hole 1 6 either at the end of the induction pipe or directly before the tooth engagement; a second thermocouple B or B' is located in the outlet hole either at the casing outlet or directly after the tooth engagement.
The wear condition of the machine can be recognised from its efficiency. This can in turn be calculated from the temperature difference between the inlet hole 1 6 and the outlet hole 1 7. With an increase of wear, an increasing proportion of the power supplied to the machine is converted into heat. The temperature is measured by means of the thermocouples mentioned. The wear can then be determined empirically, for example by means of comparative curves or even by calculation.
The measurement device preferably consists of an LCD indicator element 1 9 bonded to the casing or a coloured strip which changes with the temperature difference. Integrating the elements for the thermal efficiency measurement in the pump makes additional components unnecessary. Fundamentally, this method can be used on any hydrostatic machine.
1. Hydrostatic machine (pump or motor), characterised in that a temperature measurement device (A, A'; B, B') is located on both the inlet and outlet sides (16, 17) for the purpose of determining the temperature difference.
2. Machine in accordance with Claim 1, characterised in that a temperature indication device (1 9) which indicates the temperature difference is located on the machine.
3. Machine in accordance with Claim 1 and/or 2, characterised in that the temperature measuring devices are thermocouples.
4. Machine in accordance with Claim 2, characterised in that the temperature indication device is an LCD indicator element (19).
5. A hydrostatic machine substantially as herein described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATiON Hydrostatic machine (pump or motor) The wear condition of a hydrostatic machine can be recognised from its efficiency. This can in turn be determined from the temperature difference between the inlet and the outlet. This is a very simple and cheap method of recognising and determining the wear condition and efficiency of a hydrostatic machine. Thermocouples are particularly suitable as the temperature measuring device. It is desirable that the temperature difference should be indicated on an LCD indicator on the pump casing. One embodiment example of the invention is shown in the drawing and is explained in more detail in the following description. Figure 1 shows a gear pump in crosssection and Figure 2 shows an end view of a gear pump. In Fig. 1, 10 shows the casing of a gear pump in which is located a casing recess 11 formed by two intersecting holes 1 2 and 1 3. Two gear wheels 14 and 1 5 are in external engagement in the casing recess 11. They induce a pressure medium via an inlet hole 1 6 and displace this into an outlet hole 1 7. A thermocouple A or A' is located in the inlet hole 1 6 either at the end of the induction pipe or directly before the tooth engagement; a second thermocouple B or B' is located in the outlet hole either at the casing outlet or directly after the tooth engagement. The wear condition of the machine can be recognised from its efficiency. This can in turn be calculated from the temperature difference between the inlet hole 1 6 and the outlet hole 1 7. With an increase of wear, an increasing proportion of the power supplied to the machine is converted into heat. The temperature is measured by means of the thermocouples mentioned. The wear can then be determined empirically, for example by means of comparative curves or even by calculation. The measurement device preferably consists of an LCD indicator element 1 9 bonded to the casing or a coloured strip which changes with the temperature difference. Integrating the elements for the thermal efficiency measurement in the pump makes additional components unnecessary. Fundamentally, this method can be used on any hydrostatic machine. CLAIMS
1. Hydrostatic machine (pump or motor), characterised in that a temperature measurement device (A, A'; B, B') is located on both the inlet and outlet sides (16, 17) for the purpose of determining the temperature difference.
2. Machine in accordance with Claim 1, characterised in that a temperature indication device (1 9) which indicates the temperature difference is located on the machine.
3. Machine in accordance with Claim 1 and/or 2, characterised in that the temperature measuring devices are thermocouples.
4. Machine in accordance with Claim 2, characterised in that the temperature indication device is an LCD indicator element (19).
5. A hydrostatic machine substantially as herein described with reference to the accompanying drawing.
GB08424941A 1983-10-03 1984-10-03 Hydrostatic machine (pump or motor) Expired GB2147951B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833335862 DE3335862A1 (en) 1983-10-03 1983-10-03 HYDROSTATIC MACHINE (PUMP OR MOTOR)

Publications (3)

Publication Number Publication Date
GB8424941D0 GB8424941D0 (en) 1984-11-07
GB2147951A true GB2147951A (en) 1985-05-22
GB2147951B GB2147951B (en) 1987-07-22

Family

ID=6210807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08424941A Expired GB2147951B (en) 1983-10-03 1984-10-03 Hydrostatic machine (pump or motor)

Country Status (5)

Country Link
JP (1) JPS6061487U (en)
DE (1) DE3335862A1 (en)
FR (1) FR2552827A1 (en)
GB (1) GB2147951B (en)
IT (1) IT8423328V0 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633976A (en) * 1983-08-12 1987-01-06 The Yokohama Rubber Co., Ltd. Method of controlling lubricating-oil quantity for internal mixer
GB2259333A (en) * 1991-09-07 1993-03-10 Teves Gmbh Alfred Gear pump with a delivery rate depending non-linearly on pump speed

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1065218A (en) * 1965-09-04 1967-04-12 Vilter Manufacturing Corp Compressor protection system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH601782A5 (en) * 1976-11-30 1978-07-14 Hoefflinger Werner
DE3025767A1 (en) * 1980-07-08 1982-02-04 Robert Bosch Gmbh, 7000 Stuttgart Opto-electronic display incorporating touch control switch - has spaced transparent electrodes applied to finger depression in front surface of display
JPS5783687A (en) * 1980-11-13 1982-05-25 Nachi Fujikoshi Corp Efficiency measurement unit for hydraulic pump or motor
US4406550A (en) * 1981-01-26 1983-09-27 Lane S. Garrett Temperature monitoring and utilization system
US4510576A (en) * 1982-07-26 1985-04-09 Honeywell Inc. Specific coefficient of performance measuring device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1065218A (en) * 1965-09-04 1967-04-12 Vilter Manufacturing Corp Compressor protection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4633976A (en) * 1983-08-12 1987-01-06 The Yokohama Rubber Co., Ltd. Method of controlling lubricating-oil quantity for internal mixer
GB2259333A (en) * 1991-09-07 1993-03-10 Teves Gmbh Alfred Gear pump with a delivery rate depending non-linearly on pump speed

Also Published As

Publication number Publication date
IT8423328V0 (en) 1984-09-26
JPS6061487U (en) 1985-04-30
GB2147951B (en) 1987-07-22
DE3335862A1 (en) 1985-04-18
FR2552827A1 (en) 1985-04-05
GB8424941D0 (en) 1984-11-07

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee