WO2023052051A1

WO2023052051A1 - Valve system of a high-pressure plunger pump, and high-pressure plunger pump

Info

Publication number: WO2023052051A1
Application number: PCT/EP2022/074663
Authority: WO
Inventors: Felix Hartmann
Original assignee: Hammelmann GmbH
Priority date: 2021-09-30
Filing date: 2022-09-06
Publication date: 2023-04-06
Also published as: DE102021125450A1

Abstract

The invention relates to a valve system of a high-pressure plunger pump, said valve system comprising: a valve body (2) having a pressure channel (3) and a suction channel (4); and a plurality of closing bodies (5, 6) and energy accumulators (8, 10) associated therewith, which, together with the valve body (2), form a pressure valve on a pressure valve side (21) of the valve body (2) and a suction valve on its opposite suction valve side (22), wherein the closing bodies (5, 6) can be pressed against outlets (32, 42) of the pressure channel (3) and of the suction channel (4) with the aid of the energy accumulators (8, 10), wherein the valve body (2) has at least one further suction channel (4), and wherein first closing bodies (5), by means of which the outlets (42) of the suction channels (4) can be closed, are in the form of balls. The invention also relates to a high-pressure plunger pump.

Description

Valve system of a high-pressure plunger pump and high-pressure plunger pump

The present invention relates to a valve system of a high-pressure plunger pump according to the preamble of claim 1 and a high-pressure plunger pump.

Generic valve systems of high-pressure plunger pumps are used in high-pressure plunger pumps in which a flow medium is brought to pressures in the so-called UHP range (UHP=ultra high pressure—pressures of more than 3,000 bar).

Such a valve system is known, for example, from EP 2 085 613 B1. In the valve system known from this publication, the suction valve can be closed with the aid of a spring-loaded closing body designed as a conical pin, which, however, is associated with high production costs.

Also known is the use of a valve body, the suction side of which is closed with the aid of a ring-plate-shaped closing body, which can also be pressed against the valve body in a spring-loaded manner.

The object of the present invention is to provide a valve system for a high-pressure plunger pump that can be produced with little outlay in terms of production technology and whose service life is further increased.

This object is achieved by a valve system of a high-pressure plunger pump having the features of claim 1 and by a high-pressure plunger pump having the features of claim 15.

The valve system according to the invention has a valve body with a pressure channel and a suction channel.

The valve system also has a number of closing bodies and energy accumulators assigned to them, which together with the valve body form a pressure valve on one pressure valve side of the valve body and a suction valve on its opposite suction valve side. The closing bodies can be applied to the respective outlets of the pressure channel and the suction channel with the help of the force accumulator.

The valve body has at least one further suction channel, with the first closing bodies, with which the outlets of the suction channels can be closed, being designed as balls.

The provision of several suction channels, each of which can be closed by a ball, results in numerous advantages.

Closing bodies designed as balls are more dirt-resistant than the plate-like closing bodies from the prior art.

A further advantage is that with such a valve system, depending on the speed and volume flow generated, only one of the suction valves or several suction valves open.

A further advantage of such closing bodies designed as spheres consists in the improvement of the flow conditions compared to a plate-like closing body or also compared to the conical closing body known from the above-mentioned publication.

Finally, balls as closing bodies for one of several suction channel outlets have a significantly lower mass than conventional closing bodies due to their small body volume, which contributes in particular to reducing wear due to their improved closing behavior both in relation to the valve body and in relation to the balls.

Advantageous training variants are the subject of the dependent claims.

According to an advantageous embodiment of the invention, the valve body is designed with exactly two additional suction channels.

The formation of a valve body with exactly three suction channels enables an extremely symmetrical stress distribution in the valve body.

According to one embodiment variant, each of the first closing bodies designed as a sphere is assigned a separate force accumulator. This enables a better introduction of force to each of the balls.

According to an alternative embodiment variant, the first closing body, which is designed as a ball, is assigned a common energy accumulator.

For this purpose, a pressure body with a passage is preferably arranged between the first closing bodies, which are designed as balls, and the energy accumulator. This enables a uniform pressing force on the individual first closing bodies.

According to a preferred embodiment variant, the pressure body has an annular pressure disk.

In order to prevent the balls from escaping laterally, according to a preferred embodiment, separating bodies protruding out of the plane of the suction valve side of the valve body are provided between adjacent outlets of the suction channels.

According to an alternative embodiment variant, the first closing bodies designed as balls are accommodated in respective chambers or cage cells, which are formed on a side of the annular pressure disk facing the outlets of the suction channels.

In this embodiment variant, the suction valve side of the valve body preferably has a smooth surface in the annular area in which the outlets of the suction channels are provided.

According to a further preferred embodiment variant, the outlets of the suction channels are arranged symmetrically distributed in a plane on the suction valve side adjacent to the inlet of the pressure channel in the valve body.

This also promotes a symmetrical stress distribution in the valve body.

Particularly preferably, the distance between the outlets of the suction channels is the same.

Additionally or alternatively, the distance between the outlets of the suction channels and the inlet of the pressure channel is the same. The central longitudinal axis of the pressure channel is preferably equal to a longitudinal axis of the valve body.

Such a rectilinear pressure channel can be introduced into the valve body in an extremely simple manner as a bore.

In addition, a single pressure channel causes fewer stresses in the valve body than a plurality of smaller pressure channels with the same total cross-sectional area.

According to a preferred embodiment variant, the inlets of the suction channels are provided in an outer casing surface of the valve body.

According to a further preferred embodiment variant, a second closing body, with which the outlet of the pressure channel can be closed, is designed as a ram that is displaceably mounted in a ram housing.

According to a preferred embodiment variant, the force accumulators are designed as compression springs, in particular as cylinder compression springs.

The high-pressure plunger pump according to the invention has a pump head and a housing attached to the head, at least one plunger arrangement arranged in the housing with a working chamber and a plunger that can be moved back and forth axially in the working chamber, and a valve system connected to the working chamber, which is designed as described above .

Exemplary embodiments according to the invention are explained in more detail below with reference to the accompanying drawings. Show it:

Figure 1 is a sectional view through an embodiment of a

Pump head of a high-pressure plunger pump and a plunger coupled to it via a valve system,

FIG. 2 shows an enlarged detail of a connection area of a plunger to the pump head of the high-pressure plunger pump in a sectional side view with a first embodiment variant of a valve body and a pressure body, FIG. 3 shows an isometric representation of an embodiment variant of a valve body with separating bodies formed thereon for spacing first closing bodies designed as balls,

4 shows a sectional isometric representation of the valve body according to FIG.

FIG. 5 shows a representation corresponding to FIG. 2 of a second one

Design variant of a valve body and a pressure body,

FIGS. 6 and 7 are illustrations corresponding to FIGS. 3 and 4 of the second embodiment variant of the valve body, and

FIGS. 8 and 9 are respective isometric representations of the pressure bodies used in the arrangement according to FIGS. 5-7 for mounting the first closing bodies designed as balls.

In the following description of the figures, terms such as top, bottom, left, right, front, rear, etc. refer exclusively to the exemplary representation and position of the high-pressure plunger pump, the valve system, the valve body, the closing body and the like selected in the respective figures. These terms are not to be understood as limiting, i.e. these references can change due to different working positions or the mirror-symmetrical design or the like.

FIG. 1 shows an upper part of a high-pressure plunger pump in a sectional view overall. The high-pressure plunger pump is designed in such a way that it can be used to bring a working fluid to pressures in excess of 3,000 bar.

The upper part of the high-pressure plunger pump shown in FIG. 1 comprises a plunger head 11, which is connected to a housing 14 via threaded rods 20 shown as examples in FIGS. A plurality of plunger arrangements arranged in an inner body 16 with a working chamber 13 and a plunger 15 arranged to be axially movable back and forth in the working chamber 13 are arranged in the housing 14 . The plungers 15 are mounted in an inner body 16 which is or are screwed to the pump head 11 via screws 19 (shown in FIGS. 2 and 5).

A valve body 2 is arranged at the end of each of the plungers 15 between the pump head 11 and the inner body 16 and is mounted in the inner body 16 on the suction side and in the pump head 11 on the pressure side.

A first embodiment variant of the valve body 2 of a valve system of the high-pressure plunger pump is shown in FIG.

A pressure channel 3 and a plurality of suction channels 4 are introduced into the valve body 2, as is shown by way of example in FIG. Although FIG. 7 shows a second embodiment variant of the valve body, which is described in more detail below, the arrangement of the pressure channel 3 and the suction channels 4 is identical in the two embodiment variants described.

As shown in FIG. 2, each of the outlets of the respective suction channel 4 can be closed with the aid of a first closing body 5 designed as a ball.

The outlet 32 of the pressure channel 3 can be closed with the aid of a second closing body 6 which, in the embodiment variants shown, is in the form of a ram which is movably mounted in a ram housing 9 . Other designs of the second closing body are also conceivable, for example in the form of a further ball.

Both the second closing body 6 embodied as a plunger and the first closing body 5 embodied as balls can be pressed against the respective outlets 32 , 42 of the pressure channel 3 and the suction channels 4 with the aid of force accumulators 8 , 10 .

The force accumulators 8, 10 are preferably designed as compression springs, in particular as cylinder compression springs.

The pressing force of the cylinder compression springs assigned to the first closing body 5 is designed in such a way that the first closing bodies, which are designed as balls, 5 release at least one of the outlets 42 of the suction channels 4 when sucking in the working fluid through the suction channels 4 . The cylinder compression springs can have identical or different spring constants.

Other energy accumulators are also conceivable, for example other elastically deformable bodies, which enable the passage of the fluid sucked into the working chamber 13 into the inlet 31 of the pressure channel 3 .

As shown in FIGS. 1 and 2, the working chamber 13 is preferably delimited by a sleeve 12 which, in the direction of the valve body 2, adjoins a guide sleeve guiding the respective plunger 15. The energy accumulator 8 is inserted at an end of the sleeve 12 facing the valve body 2 .

The energy accumulator 8, designed here as a cylinder compression spring, is supported on the one hand in a step in the inner surface of the sleeve 12 and on the other hand on a pressure body 7, which is arranged between the first closing bodies 5, designed as balls, and the energy accumulator 8. In the preferred embodiment variant shown, the pressure body 7 has a pressure disk 71 and a passage 72 concentric with the inlet 31 of the pressure channel 3 . It is also conceivable to provide the passage or several such passages 72 not concentrically but in the plane of the pressure disk 71 between bearing surfaces for the balls.

Depending on the design of the energy store 8, it is also conceivable for the energy store to bear directly against the first closing bodies 5, which are designed as balls.

In a preferred embodiment variant, the valve body is designed with a total of exactly three suction channels 4 . This is illustrated in FIGS. 3 and 6 by the three first closing bodies 5 designed as balls.

In principle, the introduction of only two suction channels 4 or more than three suction channels 4 is also conceivable, the number of which is correspondingly less or more first closing body 5 is to be provided in order to close the outlets 42 of the suction channels 4 . As shown in FIGS. 3, 4, 6 and 7, the inlets of the suction channels 4 are preferably provided in an outer casing surface 23 of the valve body 2 .

In order to prevent the first closing bodies 5, which are designed as balls, from escaping, in the embodiment variant of the valve body 2 shown in FIGS.

In this embodiment variant, the pressure body 7 is preferably designed as an annular pressure disk 71 .

The length of the separating bodies 25 in direction z of the longitudinal axis of the valve body 2 is dimensioned such that the annular pressure disk 71 bears against the first closing bodies 5 designed as a ball when these close the outlets 42 of the suction channels 4 .

In the alternative embodiment variant shown in FIGS. 5 to 9, no such separating bodies 25 are provided on the suction valve side 22 of the valve body 2. In this embodiment variant, the suction valve side 22 of the valve body 2 has a smooth surface, at least in the area into which the suction channels 4 with their outlets 42 open.

In order to guide the first closing bodies 5 designed as balls, chambers 73 or cage cells, in which the first Closing body 5 are added.

The chambers 73 are formed by walls 74 that protrude from the pressure disk 71 , preferably perpendicularly.

As is further shown in FIGS. 2, 4, 5 and 7, the first closing bodies 5 designed as balls are assigned a common energy accumulator 8 .

It is also conceivable to assign a separate force accumulator 8 to each of the first closing bodies 5 designed as balls. What both variants have in common is that, depending on the speed and generated volume flow of the working fluid, a corresponding number of first closing bodies 5 moves away from the respective outlet 42 of a suction channel 4 and thus the respective suction valve is opened.

It is also conceivable to influence the opening of the respective respective suction valves through the use of force accumulators 8 with different spring constants.

As can also be seen from FIGS. 3, 4, 6 and 7, the outlets 42 of the suction channels 4 are provided in a plane on the suction valve side 22 adjacent to the inlet 31 of the pressure channel 3 in the valve body 2 .

In order to achieve symmetry or a symmetrical stress distribution in the valve body 2, the distance between the outlets 42 of the suction channels is the same. In addition, the distance between the outlets 42 of the suction channels 4 and the inlet 31 of the pressure channel is also the same here.

In the embodiment variants shown, the outlet of the pressure channel 3 is closed by the second closing body 6 embodied as a ram and mounted displaceably in the ram housing 9 .

The second closing body 6 is also preferably pressed against the pressure valve side 21 of the valve body 2 by a cylinder compression spring 10 which is supported on a step on an inner lateral surface of the tappet housing 9 .

If in the compression step the working fluid is pressed through the pressure channel 3 against the force of the force accumulator 10 into a pressure chamber 17 in the pump head 11, the second closing body 6 is lifted from the pressure valve side 21 of the valve body 2 so that the working fluid flows around the tappet housing 9 and from there out into the pressure chamber 17, as can be seen from FIGS.

A sealing ring 24 is provided on a step on the outer surface of the valve body 2 to seal the valve body 2 relative to the pump head 11 . A further sealing ring 24 is arranged close to the suction valve side 22 of the valve body 2 in order to seal the valve body 2 from the inner housing 16 . Reference List

2 Valve body 21 Pressure valve side 22 Suction valve side 23 Shell surface 24 Sealing ring

25 separator body 26 step

3 pressure channel 31 input 32 output

4 suction channel 41 inlet 42 outlet 43 first section 44 second section

5 first closing body 6 second closing body

7 pressure body 71 pressure disk 72 passage 73 chamber 74 wall

8 lift mechanism 9 tappet housing

10 lift mechanism 11 pump head

12 sleeve 13 working space 14 housing 15 plunger 16 inner body

17 pressure room 18 suction chamber

19 screw

20 threaded rod z direction of the longitudinal axis of the valve body

Claims

Expectations

1. Valve system of a high-pressure plunger pump, comprising

- a valve body (2) with a pressure channel (3) and a suction channel (4),

- Several closing bodies (5, 6) and energy stores (8, 10) assigned to them, which together with the valve body (2) form a pressure valve on one pressure valve side (21) of the valve body (2) and a suction valve on its opposite suction valve side (22). ,

- the closing bodies (5, 6) being able to be pressed against the respective outlets (32, 42) of the pressure channel (3) and the suction channel (4) with the aid of the force accumulator (8, 10), characterized in that

- the valve body (2) has at least one further suction channel (4),

- wherein the first closing body (5), with which the outlets (42) of the suction channels (4) can be closed, are designed as balls.

2. Valve system according to claim 1, characterized in that the valve body (2) is formed with three suction channels (4).

3. Valve system according to claim 1 or 2, characterized in that each of the ball-shaped first closing body (5) is associated with a separate force accumulator (8).

4. The valve system as claimed in claim 1 or 2, characterized in that the first closing bodies (5), which are designed as a ball, are assigned a common energy accumulator (8).

5. Valve system according to claim 4, characterized in that a pressure body (7) with a passage (72) is arranged between the ball-shaped first closing bodies (5) and the force accumulator (8).

6. Valve system according to claim 5, characterized in that the pressure body has an annular pressure disc (71).

7. Valve system according to claim 6, characterized in that between adjacent outlets (42) of the suction channels (4) from the plane of the suction valve side (22) of the valve body (2) protruding separating bodies (25) are provided.

8. Valve system according to claim 6, characterized in that the first closing bodies (5) designed as a ball are accommodated in respective chambers (73) or cage cells which are on a side of the annular pressure disk (4) facing towards the outlets (42) of the suction channels (4). 71) are formed.

9. Valve system according to one of the preceding claims, characterized in that the outlets (42) of the suction channels (4) are arranged symmetrically distributed in a plane on the suction valve side (22) adjacent to the inlet (31) of the pressure channel (3) in the valve body (2). are.

10. Valve system according to one of the preceding claims, characterized in that a distance between the outlets (42) of the suction channels (4) is equal to one another.

11. Valve system according to one of the preceding claims, characterized in that a distance between the outlets (42) of the suction channels (4) and the inlet (31) of the pressure channel (3) is the same.

12. Valve system according to one of the preceding claims, characterized in that a central longitudinal axis of the pressure channel (3) is equal to a central longitudinal axis of the valve body (2).

13. Valve system according to one of the preceding claims, characterized in that inputs (41) of the suction channels (4) are provided in an outer surface (23) of the valve body (2).

14. Valve system according to one of the preceding claims, characterized in that the force accumulator (8, 10) are designed as compression springs, in particular as cylinder compression springs.

15. High pressure plunger pump comprising

- a pump head (11),

- A housing (12) attached to the pump head (11),

- at least one in the housing (14) arranged plunger arrangement with a working space (13) and in the working space (13) arranged axially movable plunger (15) to and fro,

- a valve system connected to the working space (13), - 14 - characterized in that the valve system is designed according to any one of the preceding claims.