High pressure plunger pump

Abstract

A high-pressure piston pump (1) has a pump head (2), a housing (11) fixed at the pump head (2), at least one working piston assembly (3) arranged in the housing (11) with a working space (31) and an axially movably arranged working piston (32) delimiting the working space (31), a valve body (4) arranged accordingly between the pump head (2) and the housing (11) and coupled to the working space (31) with a through channel (41) and a suction channel (42) closable by a closure body (43), at least one outlet valve (5) fixed at the pump head (2) with an outlet (53) lockable by a closure body (51), wherein the through channel (41) of the valve body (4) opens into a compression space (22) of the pump head (2), wherein at least one additional piston assembly (6) is fixed at the pump head (2), wherein the at least one additional piston assembly (6) has a working space (61) fluidically connected to the working space (22) of the pump head (2) and a spring-loaded additional piston (62) delimiting the working space (61) and with which the working space (61) of the additional piston assembly (6) can be set to a predetermined volume.

Description

Technical Field

[0001] The present invention relates to a high-pressure plunger pump according to the preamble of claim 1. Background Technology

[0002] This type of high-pressure plunger pump is used in a wide variety of applications. They are particularly distinguished by their robustness, but also by the ability, due to their construction, to generate working pressures, especially above 2000 bar, for fluid media. For this purpose, the plungers are arranged side-by-side and driven by a motor via a crankshaft in connection.

[0003] To deliver a uniform volumetric flow rate and achieve "harmonious" operation, the crankshaft's crankpins are staggered 360° according to their number, allowing the plungers connected to them to reciprocate within the working space (crank mechanism). The medium is drawn in, compressed, and supplied to the collection channel via corresponding valve assemblies. The volume displaced by the arranged plungers of the high-pressure pump determines the total volumetric flow rate per unit time.

[0004] However, the applicability of this type of high-pressure plunger pump for volumetric flow rate regulation at constant speed is limited.

[0005] Adjustments can only be made via motor speed, typically achieved using a motor operated by a frequency converter. However, if very rapid adjustments are required, the system's inertia determines the response time.

[0006] Additionally, the lower speed of the high-pressure pump results in increased pulsation in the structural type, which has an adverse or even harmful effect on the application range or the durability of structural components.

[0007] It is precisely in the field of component testing that there is a need for pre-defined pressure build-up and pressure release times with rapid adjustment, which must be implemented within narrow pressure-related tolerances. Such rapid pressure adjustment can only be achieved in a very costly and intensive manner using selected electrically driven components, and sometimes it is not even possible to achieve it at all, depending on the requirements.

[0008] For many years, high-pressure plunger pumps with stroke regulation as described above have also been used, for example, as known from DE 202011 109 897 U1, in order to compensate for the aforementioned disadvantages.

[0009] Here, the high-pressure pump is driven by a main motor with a constant motor speed, and the stroke adjustment within the pump is achieved by means of two eccentric components driven by an additional motor that can swing relative to each other. This structure is relatively expensive and complex. Summary of the Invention

[0010] The objective of this invention is to improve this type of high-pressure plunger pump by enabling the delivery rate and / or pressure of the high-pressure plunger pump to be set in a simpler manner.

[0011] This task is accomplished by a high-pressure plunger pump with the features of claim 1.

[0012] The high-pressure plunger pump according to the invention has a pump head, a housing fixed at the pump head, and at least one plunger assembly disposed in the housing, having a working space and an axially movable working plunger defining the working space.

[0013] The high-pressure plunger pump also has at least one inlet valve fixed at or in the pump head, which has an inlet that can be locked by a closing body.

[0014] In addition, at least one outlet valve is fixed at or in the pump head, which has an outlet that can be locked by a closing body.

[0015] At least one additional plunger assembly is fixed at the pump head.

[0016] The at least one additional plunger assembly has a working space fluidly connected to the working space of the pump head and an axially movable additional plunger defining the working space, which allows the working space of the additional plunger assembly to be set to a predetermined volume.

[0017] With the high-pressure plunger pump according to the invention, a significantly more cost-effective implementation of this high-pressure plunger pump can be achieved with improved performance, especially in the form of faster adjustment of volumetric flow rate and rapid pressure adaptation to sudden changes in volume intake, since many previously required additional components (e.g., motors operated by frequency converters) are no longer necessary.

[0018] The high-pressure plunger pump according to the invention is particularly suitable for use in laboratory equipment, as a test pump with special characteristic curves, or as a test pump for sensors and ejectors.

[0019] Advantageous variations of the invention are the subject of the dependent claims.

[0020] According to an advantageous implementation variant, the additional plunger assembly has an adjustment unit with an adjustment element that allows the required volume of the working space of the additional plunger assembly for pressure generation to be set by limiting the offset of the additional plunger to a predetermined degree.

[0021] Therefore, different operating pressures and delivery volumes can be set in a simple way.

[0022] According to an advantageous improvement, the adjusting element is constructed as a stroke adjusting unit. Pneumatic, electric, or hydraulic adjustment of the adjusting element is conceivable.

[0023] In a preferred embodiment, the stroke adjustment unit is configured as an adjustment screw.

[0024] The additional plunger is preferably spring-loaded by an accumulator (Kraftspeicher, sometimes called a power accumulator) (preferably in the form of a compression spring) housed in the housing of the regulating unit.

[0025] According to one alternative implementation variant, the stroke adjustment unit is configured as a linear actuator directly connected to an additional plunger.

[0026] According to another alternative implementation variant, the additional plunger can be controlled by a control unit housed in the housing of the regulating unit.

[0027] According to a preferred improvement of the invention, the additional plunger is connected to the compression spring via a pressure piston.

[0028] According to one advantageous implementation variant, the outlet valve can be pneumatically, electrically, or hydraulically operated.

[0029] According to one embodiment, the at least one inlet valve is integrated into a valve body disposed between the pump head and the housing, and has a passageway connecting to the working space and leading into the compression space of the pump head, as well as a suction passage that can be closed by a closure. Here, the suction passage and the closure together form the inlet valve.

[0030] According to a preferred alternative implementation variant, the at least one inlet valve is located as a separate component at the pump head.

[0031] By constructing the inlet valve as a separate component at the pump head, maintenance of this component of the high-pressure plunger pump can be made particularly simple.

[0032] According to a preferred embodiment, the working plunger, the auxiliary plunger, and the corresponding sealing sleeve housing them are made of hard alloy or ceramic.

[0033] According to one embodiment, the at least one inlet valve is integrated into a valve body disposed between the pump head and the housing, and has a passageway connecting to the working space and leading into the compression space of the pump head, as well as a suction passage that can be closed by a closure. Here, the suction passage and the closure together form the inlet valve.

[0034] According to a preferred embodiment, a plurality of working plunger assemblies are arranged at the pump head, and a number of additional plunger assemblies corresponding to the number of working plunger assemblies are fixed thereon.

[0035] Therefore, especially when a high-pressure plunger pump is used as a test pump, test curves can be achieved particularly well without pressure deviation.

[0036] Furthermore, this high-pressure plunger pump can achieve low pulsation with a reduced volumetric flow rate, allowing for a maximum delivery capacity of the high-pressure plunger pump. Attached Figure Description

[0037] The preferred embodiments are explained in more detail below with reference to the accompanying drawings. Wherein: Figure 1 and Figure 2 A schematic isometric view of a first embodiment of the high-pressure plunger pump according to the present invention is shown. Figure 3 It shows crossing according to Figure 1 A cross-sectional view of a high-pressure plunger pump, showing the working plunger assembly, the pump head placed on it, the pump head having an integrated inlet valve and an outlet valve fixed thereon, and additional plunger assemblies. Figure 4 It shows Figure 2 The diagram shows a partial magnification of the pump head area. Figure 5 The area of ​​the pump head with an unoperable spring-loaded outlet valve is shown. Figure 4 Corresponding illustrations Figures 6 to 8 Schematic cross-sectional views of different implementation variations of the additional plunger assembly are shown. Figure 9 A schematic isometric view of an alternative embodiment of the high-pressure plunger pump according to the present invention is shown. Figure 10 To pass through according to Figure 9 The cross-sectional view of the high-pressure plunger pump shows the area of ​​the alternative pump head. Figure 4 Corresponding local magnification, Figure 11 To pass through according to Figure 9 The cross-sectional view of the high-pressure plunger pump shows the area of ​​an alternative implementation variant of the high-pressure plunger pump with controlled inlet and outlet valves. Figure 4 Corresponding local magnification, and Figure 12 The diagram illustrates an additional alternative implementation variant of a high-pressure plunger pump with externally mounted, spring-loaded outlet and inlet valves. Figure 4 Corresponding local magnification. Detailed Implementation

[0038] In the following description of the accompanying drawings, terms such as upper, lower, left, right, front, and rear refer only to exemplary illustrations and positions selected in the corresponding figures for the high-pressure plunger pump, working plunger, auxiliary plunger, working space, valve body, outlet valve, regulating unit, etc. These terms should not be construed as limiting, i.e., these references may vary by different operating positions or mirror-symmetric designs, etc.

[0039] exist Figures 1 to 3 as well as Figure 9 In the text, reference numeral 1 indicates a variant of the high-pressure plunger pump according to the present invention.

[0040] In both variants, the high-pressure plunger pump 1 has a pump head 2 with a compression space 22 and a housing 11 fixed at the pump head 2, in which at least one working plunger assembly 3 is arranged.

[0041] In all variations, the working plunger assembly 3 has a pump head 2 with a compression space 22 and a housing 11 fixed to the pump head 2, in which at least one working plunger assembly 3 is arranged.

[0042] In all variant schemes, such as Figure 3 , Figure 4 , Figure 9 and Figure 10 As shown, the working plunger assembly 3 has a working space 31 and a working plunger 32 that is axially movably arranged in a plunger housing 33 defining the working space 31. This working plunger is connected to a drive shaft 13 driven via a motor (e.g., an electric motor). Figure 3 (Presented in the middle) connection.

[0043] The drive shaft 13 is surrounded by the housing 12 of the high-pressure plunger pump 1. The axial movement of the working plunger 32 is here relative to the longitudinal axis A of the working plunger 32. AP Proceeding axially, in Figures 1 to 3 , Figure 8 and 9 In the z-direction.

[0044] like Figure 3 and Figure 4 As further shown, at least one valve body 4, connected to the working space 31, is arranged between the pump head 2 and the housing 11. This valve body has a passage 41 configured as a pressure passage and a suction passage 42 that can be closed by a closure body 43. The medium to be compressed is introduced into the working space 31 through the suction passage 42. In this first embodiment variation, the suction passage 42 and the closure body 43 form an inlet valve 9' for introducing the medium to be compressed into the working space 31.

[0045] In the illustrated embodiment, the closure 43 is implemented as a conical seal at the inlet of the suction channel 42 into the working space 31 of the working plunger assembly 3. Other seal types (plates, balls, etc.) are also conceivable. During the suction stroke of the working plunger 32, the closure is pushed away from the inlet of the suction channel due to the pressure difference between the supply pressure and the suction pressure.

[0046] If the freed working space 31 of the working plunger assembly 3 is filled with a medium during the suction stroke and a compression stroke is introduced, the closed body 43 is pushed against the inlet of the suction channel 42 and thus closes the suction channel 42.

[0047] The valve body 4 may have one or more suction channels 42, which are associated with a closure body 43 either jointly or individually. The suction channel 42 and the closure body 43 together form the inlet valve 9' of this configuration as a suction valve.

[0048] exist Figures 9 to 12 In the embodiment of the high-pressure plunger pump 1 presented in the figure, the at least one inlet valve 9 is arranged as a separate component at the pump head 2 opposite to the working space 31 of the working plunger assembly 3 in the illustrated embodiment.

[0049] The working plunger assembly 3 is connected to the pump head 2 via a valve body 4, which is implemented in a simpler way. This valve body has a passageway 41 for connecting the working space 31 to the compression space 22 of the pump head 2, but no suction passageway 42 and a closing body 43.

[0050] exist Figure 10 and Figure 12 In the embodiment shown, the inlet valve 9 has a closure body 91 for closing the inlet 93. The closure body 91 is housed in the housing 94 and is loaded by a compression spring on its side opposite to the inlet 93 so that inflow is allowed during the suction stroke of the working plunger 32, but the inlet 93 is closed during the compression stroke. The housing 94 also has a passage 92 for connection to the compression space 22 of the pump head 2.

[0051] According to Figure 11 In the alternative implementation variant, inlet valve 9 is configured as a controllable inlet valve, similar to the one described in more detail below. Figure 3 and Figure 4 5. Outlet valve.

[0052] Furthermore, in two implementation variations of the high-pressure plunger pump 1, at least one outlet valve 5 is fixed at the pump head 2.

[0053] The outlet valve 5 has an outlet 53 that can be locked by a closing body 51, through which the medium under high pressure is drawn from the high-pressure plunger pump 1.

[0054] If multiple working plungers 32 are connected in series for common fluid delivery and their respective outlets 53 are interconnected, the closed body 43 prevents the compressed and drawn-out medium located in the collection channel from flowing back into the working space 31 during the suction stroke.

[0055] The outlet valve 5 is preferably pneumatically, electrically, or hydraulically operated, such as... Figure 3 , Figure 4 and Figure 11 As presented in the text.

[0056] According to Figure 5 and Figure 12 In the implementation variant, outlet valve 5 is almost identical to... Figure 10 and 12 The inlet valve 9 shown has the same structure, and the outlet valve has a compression spring 55' acting on the closing body 51 and a passage 52' that can be closed by the closing body 51, which is configured as a ball, wherein the closing body 51 reaches the maximum pressure p of the medium during the compression stroke. max The outlet 53 is released at that time. The force of the compression spring 55' is opposite to the force of the compression spring of the inlet valve 9.

[0057] The passage 41 of the valve body 4 leads into the compression space 22 of the pump head 2, which leads to the outlet valve 5 on one hand and to the additional plunger assembly 6 fixed at the pump head 2 on the other hand.

[0058] exist Figure 1 In the illustrated implementation variant, a total of three outlet valves 5 and three corresponding additional plunger assemblies 6 are fixed at the pump head 2. Depending on capacity requirements, it is also conceivable to have more or fewer outlet valves 5 and additional plunger assemblies 6 fixed at the pump head 2 of a corresponding design.

[0059] exist Figures 6 to 8 Different implementation variations of the additional plunger assembly 6 are presented in the paper.

[0060] The common feature of all implementation variations of the additional plunger assembly 6 is a working space 61 fluidly connected to the working space 22 of the pump head 2 and an axially movable additional plunger 62 defining the working space 61.

[0061] The variable working space 61 of the auxiliary plunger 62, together with the compression space 22 of the pump head 2, forms a total compression space. During the compression stroke of the working plunger 32 of the working plunger assembly 3, the medium can be compressed in this total compression space, and this total compression space defines the maximum pressure p of the medium. max .

[0062] exist Figure 6 and Figure 8In the embodiment of the supplementary plunger assembly 6 shown, the working space 61 of the supplementary plunger assembly 6 can be set to a predetermined maximum pressure p of the limited medium via a variable stop. max The maximum volume, while Figure 7 In the variant of the additional plunger assembly 6 shown, the maximum pressure p of the medium max It is limited only by the spring pressure generated by the spring constant combined with the variably set spring preload of the accumulator 66.

[0063] exist Figure 6 and Figure 8 In the illustrated variant, the additional plunger assembly 6 has an adjustment unit 63 with an adjustment element 64 for setting the predetermined volume of the working space 61 required to generate pressure. The adjustment element here adjusts the additional plunger 62 in the axial direction A. ZP The offset is limited to a predetermined degree. The adjusting element is preferably configured as a stroke adjusting unit.

[0064] exist Figure 7 In the embodiment shown, there is also an adjustment unit 63 with an adjustment element 64, which is used to set the spring preload of the accumulator 66.

[0065] exist Figure 5 and Figure 6 In a preferred embodiment of the additional plunger assembly 6 shown, the adjusting element 64 is configured as an adjusting screw. The adjusting screw is screwed into the internal thread of the housing 69 of the adjusting unit 63.

[0066] It is also conceivable that, for example Figure 8 As shown in the diagram, the stroke adjustment unit (here, adjustment element 64) is configured as a linear actuator directly connected to the additional plunger 62.

[0067] The additional plunger 62 is preferably operated by a control unit housed in the housing of the adjustment unit 63.

[0068] like Figure 6 As further shown, the end 642 of the screw head, away from the adjusting screw, extends into the cavity 691 of the housing 69 of the adjusting unit 63. This end 642 serves as a stop for attaching the plunger 62.

[0069] exist Figure 6 In the embodiment shown, a component is supported in the cavity 691 of the housing 69, which can be axially A ZPThe piston 65 moves upwards, and an accumulator 66 loads the piston 65. The piston is pushed away from the end 642 of the adjusting screw by the accumulator 66. A first end of an additional plunger 62 is fixed at the end of the piston 65 away from the accumulator 66. The accumulator 66 is preferably constructed as a compression spring, such as... Figures 3 to 7 and Figures 10 to 12 As presented in the text.

[0070] The depth to which the adjusting screw penetrates into the cavity 691 of the housing 69, i.e., the axial direction A of the end 642 of the adjusting element 64 configured as the adjusting screw. ZP The position observed above can be easily adjusted using the screw head.

[0071] exist Figure 6 In the illustrated embodiment, the stroke-related spring force generated by the spring constant of the accumulator 66 also causes an increase in the volume of the medium and a compression of the medium pressure. In this embodiment, the spring constant of the accumulator 66 is determined such that the maximum pressure p of the medium is such that... max It is only reached after the additional plunger 62 stops at the end 642 of the adjusting element 64.

[0072] like Figures 4 to 8 and Figures 10 to 12 As further shown, the additional plunger 62 is guided in a plunger guide 68 connected to the regulating unit 63. The plunger guide 68 is fixed together with the guide housing 67, and in particular screwed onto the pump head 2.

[0073] Preferably, a connecting member 8 is provided between the housing 54 of the pump head 2 and the outlet valve 5, which has a passage 81 for the medium between the compression space 22 of the pump head 2 and the outlet 53 of the outlet valve 5.

[0074] Working plunger 32, auxiliary plunger 62 and corresponding sealing sleeve 14 accommodating them (e.g. in Figures 3 to 5 (as shown in 10 to 12) is preferably made of hard alloy or ceramic.

[0075] Reference number list 1. High-pressure plunger pump 2 Pump head 21 Valve housing space 22 Compressed Space 3 Working plunger assembly 31 Workspace 32 Working plunger 33 Guide housing 4 Valve body 41 Through the channel 42 Suction Channels 43 Closed body 5. Outlet valve 51 Closed body 52 pistons 52' Access 53 Exports 54. Housing 55' Compression Spring 6. Additional plunger assembly 61 Workspace 62 Additional plunger 63 Adjustment Unit 64 Adjustment elements 642 end 65 Pressing against the piston 66 Compression Springs 67 Guide housing 68 Plunger Guide 69. Shell 691 Cavity 8 Connecting parts 81 access 9, 9' Inlet valve 91 Closed body 92 access 93 Entrance 94. Housing 11. Shell 12. Shell 13 drive shafts 14 Sleeves X direction Y direction Z direction A AP Working plunger motion axis A ZP Additional plunger motion axis

Claims

1. A high-pressure plunger pump (1), comprising: - Pump head (2) with compression space (22), - Housing (11) fixed at the pump head (2), - At least one working plunger assembly (3) disposed in the housing (11), having a working space (31) and an axially movable working plunger (32) defining the working space (31), - At least one inlet valve (9, 9') fixed at or in the pump head (2), having an inlet (93, 42) that can be locked by a closing body (91, 43). - At least one outlet valve (5) fixed at or in the pump head (2), having an outlet (53) that can be locked by a closing body (51), Its features are, - At least one additional plunger assembly (6) is fixed at the pump head (2). - wherein the at least one additional plunger assembly (6) has a working space (61) fluidly connected to the compression space (22) of the pump head (2) and an axially movable additional plunger (62) defining the working space (61), the working space (61) of the additional plunger assembly (6) can be set to a predetermined volume by means of the additional plunger.

2. The high-pressure plunger pump (2) according to claim 1, characterized in that, The additional plunger assembly (6) has an adjustment unit (63) with an adjustment element (64), which allows the working space (61) of the additional plunger assembly (6) to be set to the volume required for pressure generation by limiting the offset of the additional plunger (62) to a predetermined degree.

3. The high-pressure plunger pump according to claim 2, characterized in that, The regulating element (64) is configured as a stroke regulating unit.

4. The high-pressure plunger pump according to claim 3, characterized in that, The stroke adjustment unit is constructed as an adjustment screw.

5. The high-pressure plunger pump according to claims 2 to 4, characterized in that, The additional plunger (62) is spring-loaded by an accumulator (66) housed in the housing of the regulating unit (63).

6. The high-pressure plunger pump according to claim 5, characterized in that, The energy storage device (66) is constructed as a compression spring (66).

7. The high-pressure plunger pump according to claim 3, characterized in that, The stroke adjustment unit is configured as a linear actuator that is directly connected to the additional plunger (62).

8. The high-pressure plunger pump according to claim 3, characterized in that, The additional plunger (62) can be operated by a control unit housed in the housing of the adjustment unit (63).

9. The high-pressure plunger pump according to claim 8, characterized in that, The additional plunger (62) is connected to the compression spring (66) via a pressure piston (65).

10. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, The outlet valve (5) can be pneumatically, electrically, or hydraulically operated.

11. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, The control of the outlet valve (5) is implemented such that the opening of the outlet valve (5) can be operated after one working stroke or multiple working strokes of the working plunger (32).

12. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, The at least one inlet valve (9) is disposed as a separate component at the pump head (2).

13. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, The working plunger (32), the auxiliary plunger (62), and the corresponding sealing sleeve (14) that accommodates them are made of hard alloy or ceramic.

14. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, The at least one inlet valve (9') is integrated in a valve body (4) arranged between the pump head (2) and the housing (11), and has a passage (41) connected to the working space (31) and leading into the compression space (22) of the pump head (2), and a suction passage (42) that can be closed by a closure (43), wherein the suction passage (42) together with the closure (43) forms the inlet valve (9').

15. The high-pressure plunger pump according to any one of the preceding claims, characterized in that, A plurality of working plunger assemblies (3) are arranged at the pump head (2), and an additional number of plunger assemblies (6) corresponding to the number of the working plunger assemblies (3) are fixed thereon.

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