CA1278461C - Heating oil pump for selective one or two-line operation - Google Patents
Heating oil pump for selective one or two-line operationInfo
- Publication number
- CA1278461C CA1278461C CA000548381A CA548381A CA1278461C CA 1278461 C CA1278461 C CA 1278461C CA 000548381 A CA000548381 A CA 000548381A CA 548381 A CA548381 A CA 548381A CA 1278461 C CA1278461 C CA 1278461C
- Authority
- CA
- Canada
- Prior art keywords
- return
- nipple
- plug
- suction
- valve seat
- 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.)
- Expired - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/02—Liquid fuel
- F23K5/04—Feeding or distributing systems using pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
Abstract A heating oil pump is designed for selective one or two-line operation. Between the suction side (12) and return side (17), there is a connecting passage (23) which can be closed by a closure member (Z4) during two-line operation. The latter is displaceable from a closed to an open position during insertion of the plug by an actuating element projecting into the insertion path of the plug (27) and back to the closed position by a return spring during removal of the plug. This provides an automatic change-over without the need for the return pressure to be higher than the suction pressure.
Description
DANFOSS A/S, 6430 Nordborg, Denmark Heating Oil Pump for Selective One or Two-line Operation The invention relates to a heating oil pump for selective one or two-line operation, comprising a suction nipple, a return nipple closable by a plug during one-line operation, and a nozzle-connecting nipple as well as a connecting passage which is disposed between the suction and return sides and is closable by a plug during two-line operation.
Such a heating oil pump is known from the Danfoss Catalogue BK.10.C3.02 "Oil Pumps Type MSL" dated November 1980, pages 2 and 3.
During one-line operation, the return nipple is closed by a plug and during two-line operation the connecting passage is closed by a plug.
This creates the danger that the assembly person inserts the wrong plug before he connects the heating oil pump for one or two-line operation. The mistake will then become apparent only when the installation has been placeb in operation. As a result, the pump is either incapable of sucking in the oil or an excess pressure i9 built up in the pump that, if conditions are unfavourable, could destroy the stuffing box.
For this reason, it is already known (DE-PS 20 08 510) to replace the plugs with a cover which can assume two positions recognisable from the outside. In one position, the return nipple is closed and in the other position the connecting passage is closed. ~lowever, such~
-- ~z~
a cover requires additional passages and is expensive.
An automatic change-over has also already been suggested (DE-OS 15 51 651), wherein a spring-loaded check valve opening towards the suction side is provided in the connecting passage. When the plug has been inserted in the return nipple, the check valve will open because a pressure is built up on the return side. However, it does not remain closed when the plug has been removed for two-line operation. The disadvantage here is that, during one-line operation, the return pressure is higher than for two-line operation because the spring force of the check valve has to be overcorne. Since the return pressure has a certain influence on the nozzle pressure, this means that an optimum nozzle pressure cannot be pre-set at the outset to be suitable for one-line as well as two-line operation. The higher return pressure during two-line operation also calls for a higher pump capaclty. At the same time, the higher return pressure signifies a larger pressure in the stuffing box that is normally connected to the return side. The height of a tank disposed at the top is therefore limited because otherwise the maximum permissable pressure in the stuffing box will be exceeded.
The heating oil pump described at the outset possesses a safety valve which precedes the nozzle-connecting nipple, wherein a diaphragm covers the outlet passage and an anular groove which surrounds same and is connected to the pressure side of the pump and on the opposite side is loaded by a spring in a chamber connected to the oil outlet '` ~LZ7~
orifice. Oil trickling past the diaphragm is discharged through the oil outlet orifice. The latter is connected to the return side of the pump. When the return pressure changes, as may occur during the previously described automatic change-over or d~ring a change in the elevation of the tank, the opening or closing pressure of the safety valve will likewise change.
The invention is based on the problem of providing a heating oil pump of the aforementioned kind in ~hich the return pressure or its influence on the nozzle behaviour is not changed during variations, particularly during automatic change-over.
This problem is solved in a first embodiment of the invention in that the closure member is displaceable from a closed to an open po~ition during insertion of the plug by an actuating element projecting into the insertion path of the plug and back to the closed position by a return spring during removal of the plug.
In this construction, it is merely necessary to insert the plug into the return nipple or remove it. The closure member in the connecting passage will then automatically assume the associated closed or open position. Since no spring force has to be overcome in the open position, the return pressure during one-line operation will not be higher than during two-line operation. The energy consumption of the pump is correspondingly reduced during two-line operation. The tank can be arranged in a more elevated position without destroying the stuffing box.
~27~
It is advisable for the closure member to be axially displaceable and to co-operate with a valve seat in iSs closed position. The axial displacement can be brought about particularly easily.
In particular t the plug may have a tappet of smaller diameter adjoining an external screwthread. This tappet can then co-operate with the actuating element.
In particular, the inner end of the plug should have a cone which converges in the direction of insertion. This permits the actuating element to be displaced particularly easily.
The actuating element itself may have an oblique surface facing the plug. This serves to displace the actuating element substantially at right angles to the plug.
In particular, the oblique surface of the actuating element can be formed by a cone. The position in which the actuating element is built in will then be immaterial. Manufacture will also be simple.
A particularly favourable construction is obtained if the actuating element is formed by an extension of the closure member.
When employing a cut-off valve which is open in the rest condition and disposed between the pressure side of the pump and the return side of the pump, it is recommended that a spring-loaded check valve which opens towards the return side be disposed in series with the ~7~
cut-off valve. In this way one avoids air being circulated during startin~ of the pump if the tank is disposed at the bottom and during one-line operation.
In an alternative e~bodi~ent, which can be employed together with the previous one, provision is made for a safety valve preceding the nozzle-connecting nipple, wherein a valve element, particularly a diaphragm, covers an outlet passage and an anular groove which surrounds same and is connected to the pressure side of the pump and on the opposite side is loaded by a spring in a chamber provided with an oil outlet orifice. 'rhe characteristic feature in this case is that the oil outlet orifice is connected to the suction side.
a constant pressure obtains on the suction side. Changes in the return pressure have no influence on the closing and opening pressure of the safety valve. The safety valve will therefore always respond at the set values, regardless of whether the return pressure changes for some reason, e.g. because of automatic change-over with the aid of a check valve.
Ir. this case, it can be advantageous for a spring-loaded check valve which opens towards the suction side to be provided between the suction nipple and the suct~on side. When the tank is disposed at the top, this check valve can prevent any influence by the height of the tank on the operation of the safety valve.
- 5A - ~ 6~
In summary, therefore, the present invention may be seen as providing a heating oil pump for selective single line or a double line operation, comprising a housing having a suction nipple, a return nipple adapted for con-nection to a return line during a double line operation, a closure plug adapted for insert.ion into the return nip-ple for closing the return nipple during single line operation, a return conduit opening to the return nipPle, a valve seat opening to the return nipple for being .in fluid communication through the return nipple to the re-turn conduit even when the plug closes the return nipple, a connecting passage for placing the valve seat in fluid communication with the suction nipple and a closure member resiliently retained in engagement with the valve seat for bloc~ing fluid flow from the return conduit and through the return nipple to the connecting passage when the closure plug is not closing the return nipple and alternately mov-able to a position by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting pas-sage, the closure plug having a conical portion that con-verges in the direction of insertion of the plug into the return nipple and is abuttable against the closure member for moving the closure member to its position to permit fluid flow to the connecting passage.
A preferred example of the invention will now be described in more ~ ' /l '78~
detail with reference to the drawing, wherein:
Fig. 7 is a diagramatic representation of a heating oil pump according to the invention, Fie. 2 is a detail of the representation for a modified embodiment, Fig. 3 is an enlarged view of the region of the return nipple when the plug is removed, Fig. 4 shows the same region when the plug is inserted, and Fig. 5 is a section through one embodiment of a safety valve.
A heating oil pump 1 comprises a diagramatically indicated housing 2 and, in it, a pump unit 3, for example a gear pump. The housing has a suction nipple 4 connected to a heating oil tank 6 by way of a suction conduit 5, a return nipple 7 which can be connected to the tank 6 by way of a return conduit 8, and a nozzle-connecting orifice 9 which can be connected to an atomizing nozzle 10. Further nipples for connecting manometers, venting apparatu~ or the like are not illustrated.
The suction nipple 4 is connected to the suction side 12 of the pump unit 3 by way of a spring-loaded check valve 11. The pressure side 13 of the pump unit 3 is connected to a pressure regulating valve 14 which, in turn, communicates with the nozzle-connecting nipple 9 by , ~:7~
way of a cut-off valve 15 which is closed in the rest condition, for example a magnetic valve, and by way of a safety valve 16. From the pressure regulating valve 14, excess oil is led to the return side 17. Further, there is a throttle passage 18 between the pressure side 13 and return side 17. An oil outlet orifice 19 of the safety valve 16 is connected by a conduit 20 to the suction side 12 of the pump unit 3.
As is shown in Fig. 2, instead of the normally closed cut-off valve 15 in series with the nozzle 10, one can also employ a normally opén cut-off valve 2l connected in series with a spring-loaded check valve 22 between the pressure side 13 and the return side 17. Such a cut-off valve is, for example, controlled hydraulically by the pump pressure.
A combined reference to Figs. l, 3 and 4 will show that in both embodiments the return conduit 17 is connected to the suction side 12 by way of a connecting passage 23. The connecting passage contains a closure member 24 which co-operates with a seat 25 and is loaded by a return spring 24a. The closure member 24 is provided with an extension which forms an actuating element 26 and proJects into the path of inserting a plug 27. When inserting this plug 27, the closure member 24 is displaced from the closed to the open position (Fig. 4). When removing the plug 27, the closed position is resumed under the influence of the return spring 24a (Fig. 3). For the purpose Or better actuation, the plug is provided adjacent to an ~Z7~
8 _ external screwthread 28 with a tappet 29 of smaller diameter terminating in a cone 30. The actuating element 26 is likewise formed by a cone 31.
The safety valve 16 is shown in Fig. 5. It is formed by a multi-part insert 32 which can be screwed into the housing 2. A diaphragm 33 covers a passage 34 leading to the nozzle-connecting nipple 9 as well as an anular groove 35 which communicates with the pressure regulating valve 14 or the cut-off valve 15 by way of a bore 36 and a passage 37. On the opposite side there is a piston 38 which is loaded by a spring 39. The chamber 40 receiving the spring is connected by way o~ the oil outlet orifice 19 to the conduit 20 and thus to the suction side 12.
This results in the followin~ function. During one-line operation, when the plug 27 is screwed into the return nipple 7 (Fig. 4), the connecting passage 23 brings about a direct connection between the return side 17 and the suction side 12. Since the closure member 24 is held open mechanically, no pressure difference need be provided between the return pressure and the suction pressure, as would be necessary when employin3 a spring-loaded check valve in the connecting passage 23.
When the plug 27 is removed (Fig. 3) to enable the return conduit 8 to be inserted in the return nipple 7, the connecting passage 23 is automatically closed. Incorrect operation is therefore avoided.
During one-line as weli as two-line operation, the pump unit 3 ~ z~
delivers heating oil by way of the pressure regulating valve 14, the cut-off valve 15 and the safety valve 16 to the nozzle 10. Should the pump unit 3 contain air during starting, as is possible during one-line operation, this is blown out through the nozzle 10 after opening of the cut-off valve 15. In the Fig. 2 embodiment, the check valve 22 ensures that this air will not immediately reach the return side 17 when the cut-off valve 21 is normally open.
The safety valve 16 has a defined opening pressure and a defined closing pressure determined by the spring 39. Although the suction pressure 12 also operates in the chamber 40, it is constant for a given pump construction. The check valve 11 ensures that the pressure level of a tank disposed at the top has no influence on the behaviour of the safety valve 16.
Many changes can be made from the illustrated constructions without departing from the basic concept of the invention.
For example, the stuffing box of the pump can be connected to the return conduit to provide for lubrication. The pressure regulating valve 14 may be of any desired known construction. ~he same applies to the cut-off valves 15 and 21.
Such a heating oil pump is known from the Danfoss Catalogue BK.10.C3.02 "Oil Pumps Type MSL" dated November 1980, pages 2 and 3.
During one-line operation, the return nipple is closed by a plug and during two-line operation the connecting passage is closed by a plug.
This creates the danger that the assembly person inserts the wrong plug before he connects the heating oil pump for one or two-line operation. The mistake will then become apparent only when the installation has been placeb in operation. As a result, the pump is either incapable of sucking in the oil or an excess pressure i9 built up in the pump that, if conditions are unfavourable, could destroy the stuffing box.
For this reason, it is already known (DE-PS 20 08 510) to replace the plugs with a cover which can assume two positions recognisable from the outside. In one position, the return nipple is closed and in the other position the connecting passage is closed. ~lowever, such~
-- ~z~
a cover requires additional passages and is expensive.
An automatic change-over has also already been suggested (DE-OS 15 51 651), wherein a spring-loaded check valve opening towards the suction side is provided in the connecting passage. When the plug has been inserted in the return nipple, the check valve will open because a pressure is built up on the return side. However, it does not remain closed when the plug has been removed for two-line operation. The disadvantage here is that, during one-line operation, the return pressure is higher than for two-line operation because the spring force of the check valve has to be overcorne. Since the return pressure has a certain influence on the nozzle pressure, this means that an optimum nozzle pressure cannot be pre-set at the outset to be suitable for one-line as well as two-line operation. The higher return pressure during two-line operation also calls for a higher pump capaclty. At the same time, the higher return pressure signifies a larger pressure in the stuffing box that is normally connected to the return side. The height of a tank disposed at the top is therefore limited because otherwise the maximum permissable pressure in the stuffing box will be exceeded.
The heating oil pump described at the outset possesses a safety valve which precedes the nozzle-connecting nipple, wherein a diaphragm covers the outlet passage and an anular groove which surrounds same and is connected to the pressure side of the pump and on the opposite side is loaded by a spring in a chamber connected to the oil outlet '` ~LZ7~
orifice. Oil trickling past the diaphragm is discharged through the oil outlet orifice. The latter is connected to the return side of the pump. When the return pressure changes, as may occur during the previously described automatic change-over or d~ring a change in the elevation of the tank, the opening or closing pressure of the safety valve will likewise change.
The invention is based on the problem of providing a heating oil pump of the aforementioned kind in ~hich the return pressure or its influence on the nozzle behaviour is not changed during variations, particularly during automatic change-over.
This problem is solved in a first embodiment of the invention in that the closure member is displaceable from a closed to an open po~ition during insertion of the plug by an actuating element projecting into the insertion path of the plug and back to the closed position by a return spring during removal of the plug.
In this construction, it is merely necessary to insert the plug into the return nipple or remove it. The closure member in the connecting passage will then automatically assume the associated closed or open position. Since no spring force has to be overcome in the open position, the return pressure during one-line operation will not be higher than during two-line operation. The energy consumption of the pump is correspondingly reduced during two-line operation. The tank can be arranged in a more elevated position without destroying the stuffing box.
~27~
It is advisable for the closure member to be axially displaceable and to co-operate with a valve seat in iSs closed position. The axial displacement can be brought about particularly easily.
In particular t the plug may have a tappet of smaller diameter adjoining an external screwthread. This tappet can then co-operate with the actuating element.
In particular, the inner end of the plug should have a cone which converges in the direction of insertion. This permits the actuating element to be displaced particularly easily.
The actuating element itself may have an oblique surface facing the plug. This serves to displace the actuating element substantially at right angles to the plug.
In particular, the oblique surface of the actuating element can be formed by a cone. The position in which the actuating element is built in will then be immaterial. Manufacture will also be simple.
A particularly favourable construction is obtained if the actuating element is formed by an extension of the closure member.
When employing a cut-off valve which is open in the rest condition and disposed between the pressure side of the pump and the return side of the pump, it is recommended that a spring-loaded check valve which opens towards the return side be disposed in series with the ~7~
cut-off valve. In this way one avoids air being circulated during startin~ of the pump if the tank is disposed at the bottom and during one-line operation.
In an alternative e~bodi~ent, which can be employed together with the previous one, provision is made for a safety valve preceding the nozzle-connecting nipple, wherein a valve element, particularly a diaphragm, covers an outlet passage and an anular groove which surrounds same and is connected to the pressure side of the pump and on the opposite side is loaded by a spring in a chamber provided with an oil outlet orifice. 'rhe characteristic feature in this case is that the oil outlet orifice is connected to the suction side.
a constant pressure obtains on the suction side. Changes in the return pressure have no influence on the closing and opening pressure of the safety valve. The safety valve will therefore always respond at the set values, regardless of whether the return pressure changes for some reason, e.g. because of automatic change-over with the aid of a check valve.
Ir. this case, it can be advantageous for a spring-loaded check valve which opens towards the suction side to be provided between the suction nipple and the suct~on side. When the tank is disposed at the top, this check valve can prevent any influence by the height of the tank on the operation of the safety valve.
- 5A - ~ 6~
In summary, therefore, the present invention may be seen as providing a heating oil pump for selective single line or a double line operation, comprising a housing having a suction nipple, a return nipple adapted for con-nection to a return line during a double line operation, a closure plug adapted for insert.ion into the return nip-ple for closing the return nipple during single line operation, a return conduit opening to the return nipPle, a valve seat opening to the return nipple for being .in fluid communication through the return nipple to the re-turn conduit even when the plug closes the return nipple, a connecting passage for placing the valve seat in fluid communication with the suction nipple and a closure member resiliently retained in engagement with the valve seat for bloc~ing fluid flow from the return conduit and through the return nipple to the connecting passage when the closure plug is not closing the return nipple and alternately mov-able to a position by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting pas-sage, the closure plug having a conical portion that con-verges in the direction of insertion of the plug into the return nipple and is abuttable against the closure member for moving the closure member to its position to permit fluid flow to the connecting passage.
A preferred example of the invention will now be described in more ~ ' /l '78~
detail with reference to the drawing, wherein:
Fig. 7 is a diagramatic representation of a heating oil pump according to the invention, Fie. 2 is a detail of the representation for a modified embodiment, Fig. 3 is an enlarged view of the region of the return nipple when the plug is removed, Fig. 4 shows the same region when the plug is inserted, and Fig. 5 is a section through one embodiment of a safety valve.
A heating oil pump 1 comprises a diagramatically indicated housing 2 and, in it, a pump unit 3, for example a gear pump. The housing has a suction nipple 4 connected to a heating oil tank 6 by way of a suction conduit 5, a return nipple 7 which can be connected to the tank 6 by way of a return conduit 8, and a nozzle-connecting orifice 9 which can be connected to an atomizing nozzle 10. Further nipples for connecting manometers, venting apparatu~ or the like are not illustrated.
The suction nipple 4 is connected to the suction side 12 of the pump unit 3 by way of a spring-loaded check valve 11. The pressure side 13 of the pump unit 3 is connected to a pressure regulating valve 14 which, in turn, communicates with the nozzle-connecting nipple 9 by , ~:7~
way of a cut-off valve 15 which is closed in the rest condition, for example a magnetic valve, and by way of a safety valve 16. From the pressure regulating valve 14, excess oil is led to the return side 17. Further, there is a throttle passage 18 between the pressure side 13 and return side 17. An oil outlet orifice 19 of the safety valve 16 is connected by a conduit 20 to the suction side 12 of the pump unit 3.
As is shown in Fig. 2, instead of the normally closed cut-off valve 15 in series with the nozzle 10, one can also employ a normally opén cut-off valve 2l connected in series with a spring-loaded check valve 22 between the pressure side 13 and the return side 17. Such a cut-off valve is, for example, controlled hydraulically by the pump pressure.
A combined reference to Figs. l, 3 and 4 will show that in both embodiments the return conduit 17 is connected to the suction side 12 by way of a connecting passage 23. The connecting passage contains a closure member 24 which co-operates with a seat 25 and is loaded by a return spring 24a. The closure member 24 is provided with an extension which forms an actuating element 26 and proJects into the path of inserting a plug 27. When inserting this plug 27, the closure member 24 is displaced from the closed to the open position (Fig. 4). When removing the plug 27, the closed position is resumed under the influence of the return spring 24a (Fig. 3). For the purpose Or better actuation, the plug is provided adjacent to an ~Z7~
8 _ external screwthread 28 with a tappet 29 of smaller diameter terminating in a cone 30. The actuating element 26 is likewise formed by a cone 31.
The safety valve 16 is shown in Fig. 5. It is formed by a multi-part insert 32 which can be screwed into the housing 2. A diaphragm 33 covers a passage 34 leading to the nozzle-connecting nipple 9 as well as an anular groove 35 which communicates with the pressure regulating valve 14 or the cut-off valve 15 by way of a bore 36 and a passage 37. On the opposite side there is a piston 38 which is loaded by a spring 39. The chamber 40 receiving the spring is connected by way o~ the oil outlet orifice 19 to the conduit 20 and thus to the suction side 12.
This results in the followin~ function. During one-line operation, when the plug 27 is screwed into the return nipple 7 (Fig. 4), the connecting passage 23 brings about a direct connection between the return side 17 and the suction side 12. Since the closure member 24 is held open mechanically, no pressure difference need be provided between the return pressure and the suction pressure, as would be necessary when employin3 a spring-loaded check valve in the connecting passage 23.
When the plug 27 is removed (Fig. 3) to enable the return conduit 8 to be inserted in the return nipple 7, the connecting passage 23 is automatically closed. Incorrect operation is therefore avoided.
During one-line as weli as two-line operation, the pump unit 3 ~ z~
delivers heating oil by way of the pressure regulating valve 14, the cut-off valve 15 and the safety valve 16 to the nozzle 10. Should the pump unit 3 contain air during starting, as is possible during one-line operation, this is blown out through the nozzle 10 after opening of the cut-off valve 15. In the Fig. 2 embodiment, the check valve 22 ensures that this air will not immediately reach the return side 17 when the cut-off valve 21 is normally open.
The safety valve 16 has a defined opening pressure and a defined closing pressure determined by the spring 39. Although the suction pressure 12 also operates in the chamber 40, it is constant for a given pump construction. The check valve 11 ensures that the pressure level of a tank disposed at the top has no influence on the behaviour of the safety valve 16.
Many changes can be made from the illustrated constructions without departing from the basic concept of the invention.
For example, the stuffing box of the pump can be connected to the return conduit to provide for lubrication. The pressure regulating valve 14 may be of any desired known construction. ~he same applies to the cut-off valves 15 and 21.
Claims (5)
1. A heating oil pump for selective single line or a double line operation, comprising a housing having a suction nipple, a return nipple adapted for connection to a return line during a double line operation, a clos-ure plug adapted for insertion into the return nipple for closing the return nipple during single line opera-tion, a return conduit opening to the return nipple, a valve seat opening to the return nipple for being in fluid communication through the return nipple to the return conduit even when the plug closes the return nip-ple, a connecting passage for placing the valve seat in fluid communication with the suction nipple and a closure member resiliently retained in engagement with the valve seat for blocking fluid flow from the return conduit and through the return nipple to the connecting passage when the closure plug is not closing the return nipple and alternately movable to a position by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting passage, the closure plug having a conical portion that converges in the direction of inser-tion of the plug into the return nipple and is abuttable against the closure member for moving the closure member to its position to permit fluid flow to the connecting passage.
2. A heating oil pump according to claim 1 in that the closure member has an oblique surface abuttable against the pump conical surface for cooperation therewith to move the closure member when the plug is inserted into the return nipple.
3. A heating oil pump for selective single line or a double line operation, comprising a housing having a noz-zle connecting orifice, a suction nipple, a return nipple adapted for connection to a return line during a double line operation, a closure plug adapted for insertion into the return nipple for closing the return nipple during single line operation, a return conduit opening to the return nipple, a valve seat opening at right angles to the return nipple for being in fluid communication through the return nipple to the return conduit even when the plug closes the return nipple, a connecting passage for placing the valve seat in fluid communication with the suction nip-ple and a closure member resiliently retained in engage-ment with the valve seat for blocking fluid flow from the return conduit and through the return nipple to the con-necting passage when the closure plug is not closing the return nipple and alternately movable to a position by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting passage, the closure member being moved at a right angle to the direction of the move-ment of the closure plug as the plug is inserted into the return nipple, the closure member and plug having cooper-ating, abuttable surfaces to facilitate the moving of the closure member as the plug is inserted into the return nip-ple, and a pump unit within the housing, the pump unit having a pressure port and a suction port, means for placing the suction port in fluid communication with the connecting passage, a safety valve member having an outlet passage fluidly connected to the nozzle connecting orifice, an annular groove surrounding the outlet passage and fluidly connected to the pressure port, a diaphragm for controlling fluid flow from the annular groove to the outlet passage, a chamber in fluid communication with the means for placing the suction port in fluid communication with the suction nipple, and spring loaded means in said chamber for resil-iently retaining the diaphragm in a position for blocking fluid flow from the annular groove to the outlet passage, and means fluidly connected between the pressure port and the annular groove for controlling fluid flow from the pres-sure port to the return passage.
4. A heating oil pump for selective single line or a double line operation, comprising a housing having a suc-tion nipple, a return nipple adapted for connection to a return line during a double line operation, a closure plug adapted for insertion into the return nipple for closing the return nipple during single line operation, a return conduit opening to the return nipple, a valve seat opening to the return nipple for being in fluid communication through the return nipple to the return conduit even when the plug closes the return nipple, a connecting passage for placing the valve seat in fluid communication with the suction nipple and a closure member resiliently retained in engagement with the valve seat for blocking fluid flow from the return conduit and through the return nipple to the connecting passage when the closure plug is not clos-ing the return nipple and alternately movable to a posi-tion by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting passage, and a noz-zle connecting orifice, and a pump unit within the hous-ing, the pump unit having a pressure port and a suction port in fluid communication with the connecting passage, a cut-off valve and a spring loaded check valve, the cut-off valve and check valve being fluidly connected in series between the pressure port and the return conduit, the check valve opening toward the return conduit.
5. A heating oil pump for selective single line or a double line operation, comprising a housing having a nozzle connecting orifice, a suction nipple, a return nipple adapted for connection to a return line during a double line operation, a closure plug adapted for inser-tion into the return nipple for closing the return nipple during single line operation, a return conduit opening to the return nipple, a valve seat opening to the return nip-ple for being in fluid communication through the return nipple to the return conduit even when the plug closes the return nipple, a connecting passage for placing the valve seat in fluid communication with the suction nipple and a closure member resiliently retained in engagement with the valve seat for blocking fluid flow from the return conduit and through the return nipple to the con-necting passage when the closure plug is not closing the return nipple and alternately movable to a position by the closure plug closing the return nipple to permit fluid flow from the return conduit and through the nipple and valve seat to the connecting passage, and a pump unit with-in the housing, the pump unit having a pressure port and a suction port, means for placing the suction port in fluid communication with the connecting passage, a safety valve member having an outlet passage fluidly connected to the nozzle connecting orifice, an annular groove surrounding the outlet passage and fluidly connected to the pressure port, a diaphragm for controlling fluid flow from the an-nular groove to the outlet passage, a chamber in fluid communication with the means for placing the suction port in fluid communication with the suction nipple, and spring loaded means in said chamber for resiliently retaining the diaphragm in a position for blocking fluid flow from the annular groove to the outlet passage, and means fluidly connected between the pressure port and the annular groove for controlling fluid flow from the pressure port to the return conduit, and a spring loaded check valve that opens toward the suction port fluidly connected between the con-necting passage and the suction nipple.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3636647.1 | 1986-10-28 | ||
| DE19863636647 DE3636647A1 (en) | 1986-10-28 | 1986-10-28 | Fuel oil pump for optional single or double line operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1278461C true CA1278461C (en) | 1991-01-02 |
Family
ID=6312642
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000548381A Expired - Lifetime CA1278461C (en) | 1986-10-28 | 1987-10-01 | Heating oil pump for selective one or two-line operation |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS63120884A (en) |
| CA (1) | CA1278461C (en) |
| DE (1) | DE3636647A1 (en) |
| DK (1) | DK538587A (en) |
| IT (1) | IT1211429B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4404517C2 (en) * | 1994-02-12 | 1999-07-29 | Suntec Ind France Sa | Hydraulic circuit for an oil burner |
| DE19645180A1 (en) * | 1996-11-02 | 1998-05-07 | Eberspaecher J Gmbh & Co | Pressure atomizer burner for an engine-independent vehicle heater |
| US6983890B2 (en) | 2002-01-21 | 2006-01-10 | Webasto Thermosysteme International Gmbh | Vehicle heating appliance with a valve in the fuel supply |
| DE10230401A1 (en) * | 2002-07-05 | 2004-01-22 | J. Eberspächer GmbH & Co. KG | Fuel pressure regulator, in particular for an atomizer burner for a vehicle heater |
| US9638413B2 (en) * | 2014-03-05 | 2017-05-02 | Progreen Labs, Llc | Treatment device of a heating system |
-
1986
- 1986-10-28 DE DE19863636647 patent/DE3636647A1/en active Granted
-
1987
- 1987-10-01 CA CA000548381A patent/CA1278461C/en not_active Expired - Lifetime
- 1987-10-15 DK DK538587A patent/DK538587A/en not_active Application Discontinuation
- 1987-10-26 JP JP62270060A patent/JPS63120884A/en active Pending
- 1987-10-27 IT IT8767901A patent/IT1211429B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DK538587D0 (en) | 1987-10-15 |
| IT8767901A0 (en) | 1987-10-27 |
| JPS63120884A (en) | 1988-05-25 |
| IT1211429B (en) | 1989-10-26 |
| DK538587A (en) | 1988-04-29 |
| DE3636647A1 (en) | 1988-05-19 |
| DE3636647C2 (en) | 1988-10-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |