DE2818339A1 - SUBMERSIBLE PISTON PUMP WITH CIRCULATION - Google Patents

Description

DIPL. ING. HEINZ BARDEHLE DIPL. CHEM. DR. PETER FÜRNISS

PATENT LAWYERS

File number:
Applicant:

Kabushiki Kaisha Shikutani No. 470 Renshoji, Odawara-shi, Kanagawa-ken Japan

Munich,

April 26, 1978

s / yes

Our reference: ρ 2705

Let the plunger pump with underweight through

809849/0612

Office: Hermstrasse 15, Munich 22

The invention relates to horizontal plunger pumps for use in motorized atomizers or the like. She concerns in particular, a plunger sealing and lubricating device of the type which has a bypass flow circulation passage from a Having cavity between the front and rear packing to the suction chamber.

Piston pumps usually require the packing to be replaced when the fluid is in significant amount Leakage from the pump body so that the seeping liquid does not corrode the pump housing. Additional Difficulties arise when the liquid is smelly or toxic.

According to the prior art is a device for plunger pumps known, the front and rear packing, a grease pack interposed therebetween and a liquid passage extending from a space between the front and rear lubricant packs to the suction chamber extends, wherein liquid leaking from the front packing returns through the passage into the suction chamber.

The device described above has the disadvantage that grease is dispersed along with the liquid enters the suction chamber. Another disadvantage is that the rear packing is the last stop in its rear Area is insufficiently lubricated, which leads to the fact that it soon wears out and leaks in use.

According to the invention a piston sealing and lubricating device for horizontal plunger pumps is provided which has a sealing space for each piston in the rear of the cylinder block

809649/0612

(ρ

having. The space has a front and a rear part and a recess therebetween, a pack fastening part, the front part of which is fitted with a thread into the rear part of the space and the rear part protrudes to the rear from the space, a front packing which is located in the front part of the Space is arranged, a rear packing which is arranged in the rear part of the fastening part and the front side of which is adjacent to an inner annular shoulder which is formed between the front and the rear part of the fastening part. Furthermore, an oil lubrication seal is attached in the rear part of the fastening part behind the rear packing, which has a leg drawn down from the fastening part which is immersed in oil in an oil pan which is fastened to the cylinder block. The fastening part has in its front part a plurality of holes for internal connection between the annular recess in the space and a space which is delimited by the front and rear packing within the fastening part. In addition, a passage for internal communication between the annular recess and the suction chamber is provided in the cylinder head, and a line is arranged in the passage between the cylinder block and the cylinder head. The piston reciprocates horizontally between the front and rear packing and the oil lubrication seal. The rear packing has a sufficiently large friction surface around the piston to prevent liquid from escaping.

With this arrangement, both the front packing and the front half of the rear packing become sufficient lubricated with liquid coming from the suction chamber and exiting the front packing. The back half the rear packing is well lubricated with oil that

809849/0612

comes from the oil lubrication seal behind the rear packing. This way the oil is away from the liquid separated and is prevented from entering the suction chamber together with the liquid. Because of the large surface the rear packing around the piston prevents the liquid from leaking out of the pump body and thus returns from the space between the front and rear packing via the passage in the low side Pressure back into the suction chamber. Therefore, the packs can be used for a long time without encountering sealing problems.

According to a preferred embodiment of the invention, a Multi-piston pump provided. The front part of the space has a smaller diameter than the rear part. the adjacent recesses are connected to one another by a respective channel formed in the cylinder block. On the On the upper side of the cylinder there is an additional inlet opening with a removable sealing plug which can be removed extends from the top surface of the cylinder block toward one of the passages. Therefore, if necessary, a second liquid line can be used through the additional opening on the suction side of the pump, to which liquid is fed from the main liquid line, be forwarded.

In an advantageous embodiment, the rear packing has a T-shaped cross-section to make wide frictional contact with the piston. The oil lubrication seal is formed in the form of a keyhole or key ring, the leg through one of the slots in the lower side of the fastening part is pulled outwards.

In general it is a fact that the pump because of the Liquid layering, in which liquid from the sealing

809849/0612

₀ -; ^ - i «L INSPECTED

pack leaks, shows no reduction, but an increase in the pump performance. Therefore, the invention increases Sealing and lubricating device the pump performance.

Compared to the prior art, the invention is based on the object of an improved piston sealing and lubricating device for horizontal plunger pumps in which the packings can be used for a long time without sealing problems can be.

Another purpose of the invention is to provide an improved piston seal and lubrication device for horizontal piston pumps that improve pump performance brings.

Another purpose of the invention is an improved sealing and lubricating device for horizontal piston pumps, in which a second liquid line can be connected to the main liquid line.

The above and other purposes and features of the invention are explained in more detail from the following description of a preferred embodiment of the invention with reference to the figures.

Figure 1 is a side view of a horizontal piston pump with the device according to the invention, partly in section;

Figure 2 is a somewhat enlarged section along II-II in Figure 1 and

FIG. 3 is a somewhat enlarged section along III-III in FIG.

809849/0612

As can be seen from Figure 1, the horizontal piston pump for use in motorized atomizers has a cylinder block 1, which is attached to a crankcase 2 which is fixedly mounted on a base plate 8. Three plungers 3 (Figure 2) are horizontally parallel in the cylinder block 1 and crankcase 2 sliding. The back end of everyone The piston 3 is fastened to the respective piston head 7 of a crank system in the crankcase 2 by means of a thread. One with the Crank system connected pulley 9 is driven by a primary drive, such as. B. an electric motor or an internal combustion engine (not shown) in rotation, so that the Crank system moves both the piston head 7 and the plunger back and forth.

The cylinder block 1 is formed with three hollow cylindrical spaces 4, each of which surrounds a piston 3 coaxially. Of the Space 4 has a front and a rear end 41, 42 and an annular recess 11 between them, the front Part 41 has a smaller diameter than the rear part 42. A front packing 5 is in the front part 41 and is pushed from the front of a hollow cylindrical attachment part 6. The fastening part 6 has a front part 61 and a rear part 62 which coaxially surround the respective piston 3, the front Part 61 has a smaller diameter than the rear part 62. The outer periphery of the front part 61 is with a Provided thread that fits into the thread arranged on the inner periphery of the rear part 42 of the space 4 and the rear Part 62 protrudes to the rear from the space 4 of the cylinder block 1.

809849/0612

A rear packing 21 is coaxially disposed in the rear 62 for tight contact with an inner one annular shoulder formed between the front part 61 and the rear part 62 to produce. The rear Sealing packing 21 has a T-shaped cross section, the narrow outer section being supported by a collar 18 which is fitted in the rear part 62 by means of a snap ring 2O. An oil lubrication seal 19 in the form of a The keyhole or ring is located behind the rear packing 21, the leg of the oil lubrication seal 19 is pulled through one of the slots on the underside of the fastening part 6 in the downward direction and dips into the oil of an oil pan 23 attached to the cylinder block. The oil is fed through a bore 35 in the crankcase 2 the oil pan 23 is supplied.

The fastening part 6 has a plurality of holes 12 which are formed in the vicinity of the front end in the front part 61, around a cavity 10 which is delimited by the front and rear packing 5, 21 within the front part 61, and to connect the annular recess 11 in the space 4. A drip ring 30 is on the piston 3 behind the oil lubrication seal 19 attached.

A cylinder head 25, which has a suction chamber 27 and an exhaust chamber 31, is attached to the front of the cylinder block 1. The suction and discharge chambers 27 and 31 are connected to a pump chamber 36 via suction and discharge valves 26, 32, respectively. The middle ones Openings of the front and rear packs 5 and 21 are sealingly adapted to the piston 3 and are thus sealingly sliding up to him. In contrast, the middle part of the oil lubrication seal is 19 loosely adapted to the piston 3 in order to oil iha.

809849/061 2

As can be seen from Figures 2 and 3, are between the adjacent annular recesses 11 to produce a Connection between them two channels 14 formed in the cylinder block 1. There is also an additional inlet port in the cylinder block 16 provided with a removable screw plug 17, which extends from the upper surface of the cylinder block 1 after a the channels 14 extends. It is still a horizontal passage 24 is provided, which extends from the suction chamber 27 in the cylinder head 25 through a line 29, which acts as a bridge between the cylinder head 25 and the cylinder block 1 is arranged, after one of the channels 14 in the cylinder block 1 extends. The line 29 has a packing 28 at each of its opposite ends. From this it can be seen that on the side low pressure is a water circuit, which consists of the cavity 10, the holes 12, the annular recess 11, the channel 14, the additional inlet opening 6 and the horizontal Passage 24 and line 29 composed.

The operation of the piston pump described above will now be explained. After starting the primary drive, the crank system is activated driven and moves the piston head 7 together with the plunger 3 through the front and rear packing 5, 7 and the oil lubrication seal 19 through it. Water comes out of the Suction chamber 27 through line 29, horizontal passage 24, channel 14, annular recess 11 and holes 12 in the cavity 10 so that the front packing 5 and the the front half of the rear packing 21 is well lubricated with water at its friction surface around the piston 3 at all times are. Water ″ passing through the front packing 5 lubricates the front packing 5 as well as the front one Half of the rear packing 21. On the other hand, the rear half of the rear packing 21 becomes sufficient with oil lubricated by the oil lubrication packing arranged behind it 19 originates. Although the rear packing 21 is a

809849/0612

has a large friction surface with the piston 3, it will both Sufficiently lubricated with water or oil at the front as well as at the rear, which leads to a permanent packing. The arrangement is made so that the oil lubricates the rear pack 19 separately from the water and does not enter the suction chamber together with water. Of course, oil lubrication is easier to maintain than grease lubrication.

The rear packing 21 has as a waterproof barrier such a large friction surface around the piston 3 that the water on Stepping through is prevented. The water flows from the space 10 through the holes 12, the annular recess 11, the channel 14, the horizontal passage 24 and the line 29 in the suction chamber 27 back again, all on the low pressure side are located.

After removing the screw plug 17 / to a second liquid line, z. B. for chemical substances, can be connected to the additional inlet opening 16, from which the liquid through the channel 14, the horizontal passage 24 and the line 29 is passed into the suction chamber 27 on the low pressure side. Therefore, chemicals added from the second line can easily be mixed with water added from the first line will be mixed and pumped.

809849/0612

Empty soap

Claims (7)

DIPL. ING. HEINZ BARDEHLE Munich, DIPL. CHEM. DR. PETER FÜRNISS PATENT Attorneys> * Ö 1 Q * 3 * 3 Ο File reference: Our reference: ρ 2705 Applicant: Claims 1y plunger piston pump with a urea circulation passage, thereby marked . draws that a crankcase (2) is attached to a base plate (8), a cylinder block (1) is attached to the crankcase, a cylinder head (7) is attached to the front part of the cylinder block and at least one piston (3) slides horizontally in the Cylinder block is arranged, wherein a hollow cylindrical space (4) is formed coaxially with each piston in the cylinder block, the space having a front (41) and a rear (42) area and between an annular recess (11), with a hollow cylindrical Fastening part (6), the front part (61) of which fits thread-lockingly into the rear part (42) of the room and the rear / (62) protrudes to the rear of the room, the front part (61) of the fastening part (6) being a smaller one Has a diameter than the rear part (62) and forms an annular shoulder therebetween, a first packing (5) is formed in the front part of the space in front of the fastening part, a second packing (21) is formed in the rear part of the fastening part, the front side of which presses against the shoulder, an oil lubrication seal (19) is attached behind the second packing (21) in the rear part of the fastening part (6), with a leg part of the oil lubrication seal coming out of the fastening part is pulled down and immersed in the oil of an oil pan (23) which is attached to the cylinder block, wherein the attachment part in its front part has several holes (12) for internal connection between a cavity (10), 809849/061? Office: HerrnBtraße 15, Munich 32 ___. INISPECTED which is bounded by the first and second packing (5, 21) and the annular recess (11) in the space / ^a a ^e xnne * rer liquid passage (24) for communication between the recess (11) in the cylinder block and a suction chamber (27 ) is provided in the cylinder head (25), and a sealed line (29) is arranged in the liquid passage, which bridges the connection between the cylinder block (1) and the cylinder head (25). 2. Pump according to claim 1, characterized in that the cylinder block (1) at least one channel (14) between the adjacent annular recesses (11) to their inner one Having connection. 3. Pump according to claim 1 and / or 2, characterized in that that the cylinder block (1) has an additional inlet opening (16) with a removable closure (17), the Opening extends vertically from the upper side of the cylinder block to one of the channels (14). 4. Pump according to one of claims 1 to 3, characterized in that that the liquid passage (24) extends horizontally from a channel (14) to the suction chamber (27) in the cylinder head (25) extends. 5. Pump according to one of claims 1 to 4, characterized in that that the front area (41) of the space (4) has a smaller diameter than the rear area (42). 809849/0612 6. Pump according to one of claims 1 to 5, characterized in that that the second üichtung pack (21) has such a large friction surface on the piston (3) that the Liquid is prevented from leaking. 7. Pump according to one of claims 1 to 6, characterized in that that the second packing (21) has a T-shaped cross section and the oil lubrication seal (21) the shape having a keyhole. 809849/0612