Volume adjusting device of rotary plunger pump

Abstract

The utility model discloses a volume adjusting device for a rotary plunger pump, which relates to the technical field of adjusting devices, aims to solve the problem that the volume of the rotary plunger pump is inconvenient to adjust, and comprises a motor fixing plate for mounting a motor and a pump head fixing plate for mounting a pump head component which are oppositely arranged, the motor and the pump head assembly are installed and positioned by arranging the motor fixing plate and the pump head fixing plate, the pump head fixing plate is embedded in the motor fixing plate and movably connected with the motor fixing plate, and the position of the pump head fixing plate relative to the motor fixing plate is adjusted through the adjusting assembly. The adjusting assembly is used for adjusting the included angle between the axis of the inner sleeve of the pump head assembly and the axis of the main shaft of the motor so that the pump volume of the rotary plunger pump can be adjusted, the adjusting assembly is in clearance fit with the motor fixing plate and the pump head fixing plate, the adjusting assembly does not participate in fixing of the rotary plunger pump, and misalignment of the pump volume caused by failure of the adjusting assembly is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of regulating devices, and more specifically, to a volume regulating device for a rotary plunger pump. Background Art

[0002] A rotary plunger pump is a precision metering pump. Its principle is that the axis of the inner sleeve in the pump head forms a certain angle with the axis of the motor main shaft. As the motor rotates one week, the plunger reciprocates once, realizing one liquid pumping and discharging process. And the volume of the liquid discharged or inhaled (i.e., the pump volume) is fixed. Only by changing the angle between the axis of the inner sleeve in the pump head and the axis of the rotating motor main shaft can it be adjusted. The larger the angle between the axis of the inner sleeve in the pump head and the axis of the motor main shaft, the longer the stroke of the plunger's expansion and contraction, and thus the larger the amount of liquid pumped and discharged by the rotary plunger pump in one revolution. Conversely, it is smaller.

[0003] With the development of technology, currently, micro and small rotary plunger pumps are used more and more, especially in the fields of in vitro diagnostic equipment, pharmaceuticals, food, and chemical industries, etc. Micro and small rotary plunger pumps have the characteristics of compact structure, simple system control, high liquid injection accuracy, and short unit operation time. However, with the increase in application scenarios, some inconveniences of this type of pump have also emerged, mainly manifested as inconvenient adjustment, high cost, low structural strength, and instability of the sample addition accuracy caused by liquid leakage, etc.

[0004] Currently, it is known in the market that the pump head rotates on the fixed plate through the meshing transmission of spur gears. Its disadvantages are small transmission ratio, difficult to adjust the small gear and there is no position to borrow force, and high gear precision requirements, resulting in high processing cost and assembly cost; another one is to use a lead screw mechanism to realize the swing of the pump head. The disadvantage is that the lead screw is a fine thread, not easy to adjust, easy to break after being stressed, and different tools need to be prepared to complete the adjustment of the pump during debugging, with complex operation; there is also no regulating device, which is extremely inconvenient during use and not convenient for later maintenance. When maintaining the existing rotary plunger pump, some need to disassemble the pump head, some need to first remove the external pump shell, and then the pump head assembly can be taken out. Some pump heads cannot be disassembled, and if forced to disassemble, the pump sheet metal must be removed. After maintenance, it is very troublesome to re-adjust the liquid volume of the pump.

[0005] The regulating device of the existing rotary plunger pump has a complex structure and is not easy to adjust. The failure of the regulating device will directly lead to the inaccuracy of the pump volume; different tools such as an open-end wrench and an internal hexagon are needed for adjustment, and it is easy to cause problems such as damage and fracture of the regulating device and rupture of the outer shell during adjustment, and the manufacturing cost is high and the process is complex; it is difficult to maintain the pump head and replace the sealing ring, resulting in different degrees of influence on the overall stability of the pump and the sample addition accuracy.

[0006] Therefore, how to solve the problem that it is inconvenient to adjust the pump volume of a rotary plunger pump is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0007] In view of this, the purpose of the present utility model is to provide a rotary plunger pump volume adjustment device. By setting an adjustment component, the pump volume of the rotary plunger pump can be adjusted quickly and conveniently. The adjustment component is in a clearance movable state and does not participate in the fixation of the rotary plunger pump, so that the pump volume will not be inaccurate due to the failure of the adjustment component.

[0008] In order to achieve the above purpose, the present utility model provides the following technical solutions:

[0009] A rotary plunger pump volume adjustment device includes: a motor fixing plate for installing a motor and a pump head fixing plate for installing a pump head assembly, which are arranged oppositely. The pump head fixing plate is nested in the motor fixing plate and is movably connected to the motor fixing plate. The position of the pump head fixing plate relative to the motor fixing plate is adjusted through an adjustment component to adjust the included angle between the axis of the inner sleeve of the pump head assembly and the axis of the main shaft of the motor. The adjustment component has a clearance fit with both the motor fixing plate and the pump head fixing plate.

[0010] Preferably, the adjustment component includes an adjustment dial tooth for adjusting the position of the pump head fixing plate, and further includes an adjustment nut for controlling the rotation of the adjustment dial tooth. The adjustment nut and the adjustment dial tooth are fixed by screws.

[0011] Preferably, the adjustment dial tooth is of a diamond structure. Positioning columns are provided at both ends of the adjustment dial tooth, and a connecting shaft is provided at the center of the adjustment dial tooth. The connecting shaft is of a hollow structure.

[0012] Preferably, the pump head assembly includes a pump head for installing an inner sleeve and a plunger structure that moves telescopically along the inner sleeve. The pump head is detachably arranged on the pump head fixing plate. Two positioning pins are provided at the bottom of the pump head, and two first positioning holes corresponding to the positioning pins one by one are provided on the pump head fixing plate.

[0013] Preferably, the pump head fixing plate is of an inverted U-shaped structure. A first central hole for installing the connecting shaft is provided on one side plate of the pump head fixing plate. Second positioning holes for cooperating with the positioning columns are provided horizontally on both sides of the first central hole. First threaded holes are provided diagonally on both sides of the first central hole. A bearing is provided in the first central hole. A second central hole for installing a locking screw and second threaded holes provided horizontally on both sides of the second central hole are provided on the other side plate of the pump head fixing plate.

[0014] Preferably, the motor fixing plate is of a U-shaped structure and is sleeved outside the pump head fixing plate. A through hole for mating with the motor output end is provided at the bottom of the motor fixing plate. A first central circular hole for mating with the first central hole is provided on one side plate of the motor fixing plate. Two symmetrical first arc-shaped long holes are provided on both sides of the first central circular hole along the diagonal direction. A second central circular hole for mating with the second central hole is provided on the other side plate of the motor fixing plate. Two symmetrical second arc-shaped long holes are provided on both sides of the second central circular hole along the horizontal square direction.

[0015] Preferably, the main shaft is rotationally connected to the plunger structure through a bearing assembly.

[0016] Preferably, the bearing assembly includes a bearing seat connected to the main shaft, and also includes a universal bearing provided on the bearing seat. The universal bearing is rotationally connected to the bottom end of the plunger structure.

[0017] Preferably, an origin sensor connected to the controller is provided on the motor fixing plate. An arc-shaped retaining piece is circumferentially provided at the bottom end of the bearing seat. The origin sensor is used to detect the initial position of the arc-shaped retaining piece.

[0018] Preferably, an O-ring and a sealing ring are provided circumferentially on the plunger structure.

[0019] The rotary plunger pump volume adjustment device provided by the present utility model includes a motor fixing plate for installing a motor and a pump head fixing plate for installing a pump head assembly, which are oppositely arranged. The installation and positioning of the motor and the pump head assembly are realized by setting the motor fixing plate and the pump head fixing plate. The pump head fixing plate is nested inside the motor fixing plate and is movably connected to the motor fixing plate. The position of the pump head fixing plate relative to the motor fixing plate is adjusted through an adjustment assembly to adjust the included angle between the axis of the inner sleeve of the pump head assembly and the axis of the main shaft of the motor, so as to realize the adjustment of the pump volume of the rotary plunger pump. The adjustment assembly is in clearance fit with both the motor fixing plate and the pump head fixing plate, so that the adjustment assembly does not participate in the fixation of the rotary plunger pump, and the pump volume will not be inaccurate due to the failure of the adjustment assembly.

[0020] For the rotary plunger pump volume adjustment device arranged in the above manner, when the pump volume of the rotary plunger pump needs to be adjusted, only the position of the pump head fixing plate relative to the motor fixing plate is adjusted through the adjustment assembly, so that the pump head fixing plate deflects relative to the motor fixing plate, so that the included angle between the axis of the inner sleeve of the pump head assembly and the axis of the main shaft of the motor changes, thereby changing the pump volume until the pump volume meets the requirements. The whole process of adjusting the pump volume is simple and easy to operate, convenient and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0022] Figure 1 Structural schematic diagram of the volume adjustment device of the rotary plunger pump provided by the present invention;

[0023] Figure 2 Exploded view of the volume adjustment device of the rotary plunger pump provided by the present invention;

[0024] Figure 3 Structural schematic diagram of the adjustment assembly provided by the present invention;

[0025] Figure 4 Installation schematic diagram of the adjustment assembly provided by the present invention;

[0026] Figure 5 Structural schematic diagram of the pump head fixing plate provided by the present invention;

[0027] Figure 6 Structural schematic diagram of the motor fixing plate provided by the present invention;

[0028] Figure 7 Top view of the volume adjustment device of the rotary plunger pump provided by the present invention.

[0029] Reference numerals:

[0030] 1 - Motor, 11 - Main shaft;

[0031] 2 - Motor fixing plate, 21 - First central circular hole, 22 - First arc-shaped long hole, 23 - Second central circular hole, 24 - Second arc-shaped long hole;

[0032] 3 - Pump head assembly, 31 - Pump head, 32 - Plunger structure, 33 - O-ring, 34 - Sealing ring;

[0033] 4 - Pump head fixing plate, 41 - First central hole, 42 - Second positioning hole, 43 - First threaded hole, 44 - Second central hole, 45 - Second threaded hole;

[0034] 5 - Adjustment assembly, 51 - Adjustment dial tooth, 511 - Positioning post, 512 - Connecting shaft, 52 - Adjusting nut;

[0035] 6 - Positioning pin;

[0036] 7 - Locking screw;

[0037] 8 - Bearing assembly, 81 - Bearing housing, 82 - Cardan bearing;

[0038] 9 - Origin sensor;

[0039] 10 - Arc-shaped baffle. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] In the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] It should be noted that the above orientation terms such as "upper" and "lower" are defined based on the accompanying drawings of the specification.

[0043] The core of the present invention is to provide a volume adjustment device for a rotary plunger pump. By setting the adjustment component 5, the pump volume of the rotary plunger pump can be adjusted quickly and conveniently. The adjustment component 5 is in a clearance movement state and does not participate in the fixation of the rotary plunger pump, and will not cause the inaccuracy of the pump volume due to the failure of the adjustment component 5.

[0044] Please refer to Figure 1 and Figure 2 , a volume adjustment device for a rotary plunger pump includes a motor fixing plate 2 for installing a motor 1 and a pump head fixing plate 4 for installing a pump head assembly 3 that are arranged opposite to each other. The installation and positioning of the motor 1 and the pump head assembly 3 are realized by setting the motor fixing plate 2 and the pump head fixing plate 4. The pump head fixing plate 4 is nested in the motor fixing plate 2 and is movably connected to the motor fixing plate 2. The position of the pump head fixing plate 4 relative to the motor fixing plate 2 is adjusted by the adjustment component 5 to adjust the included angle between the inner sleeve axis of the pump head assembly 3 and the main shaft 11 axis of the motor 1, so as to realize the adjustment of the pump volume of the rotary plunger pump. The adjustment component 5 is in clearance fit with both the motor fixing plate 2 and the pump head fixing plate 4, so that the adjustment component 5 does not participate in the fixation of the rotary plunger pump, and will not cause the inaccuracy of the pump volume due to the failure of the adjustment component 5.

[0045] For the rotary plunger pump volume adjustment device set in the above manner, when it is necessary to adjust the pump volume of the rotary plunger pump, only by adjusting the position of the pump head fixing plate 4 relative to the motor fixing plate 2 through the adjusting component 5, the pump head fixing plate 4 is deflected relative to the motor fixing plate 2, so that the included angle between the inner sleeve axis of the pump head assembly 3 and the main shaft 11 axis of the motor 1 changes, thereby changing the pump volume until the pump volume meets the requirements. The whole process of adjusting the pump volume is simple and easy to operate, convenient and fast.

[0046] Please refer to Figure 3 and Figure 4 , the adjusting component 5 includes an adjusting dial tooth 51 for adjusting the position of the pump head fixing plate 4, and also includes an adjusting nut 52 for controlling the rotation of the adjusting dial tooth 51. The adjusting nut 52 and the adjusting dial tooth 51 are fixed by screws.

[0047] It should be noted that when it is necessary to adjust the position of the pump head fixing plate 4, first loosen the screws fixing the pump head fixing plate 4 and the motor fixing plate 2, and then manually rotate the adjusting nut 52 forward or backward to drive the adjusting dial tooth 51 to rotate, so as to realize the adjustment of the pump head fixing plate 4, drive the included angle between the inner sleeve axis of the pump head assembly 3 and the main shaft 11 axis of the motor 1 to change, thereby changing the pump volume until the pump volume meets the requirements. Finally, tighten the pump head fixing plate 4 and the motor fixing plate 2 with screws.

[0048] In the above situation, the adjusting dial tooth 51 is of a diamond structure. Positioning columns 511 are provided at both ends of the adjusting dial tooth 51, and a connecting shaft 512 is provided at the center of the adjusting dial tooth 51. The connecting shaft 512 is of a hollow structure.

[0049] It can be understood that the adjusting dial tooth 51 is preferably of an equal arm length structure. Since the rotary plunger pump needs to be adjusted in both forward and reverse directions, if the arm lengths of the adjusting dial tooth 51 are not equal, it is more laborious to adjust and the force is not easy to grasp.

[0050] Furthermore, the pump head assembly 3 includes a pump head 31 for installing the inner sleeve and a plunger structure 32 that moves telescopically along the inner sleeve. The pump head 31 is detachably arranged on the pump head fixing plate 4. Two positioning pins 6 are provided at the bottom of the pump head 31, and two first positioning holes corresponding to the positioning pins 6 are provided on the pump head fixing plate 4.

[0051] It should be noted that the pump head 31 is installed into the positioning holes of the pump head fixing plate 4 through the positioning pins 6. Due to the existence of the positioning pins 6, the installation accuracy of the pump head 31 is guaranteed. By tightening from the top of the pump head 31 with screws, it is convenient to disassemble the pump head 31 and maintain the plunger structure 32 and replace the sealing ring 34. At the same time, the positioning accuracy during secondary assembly is guaranteed, and the problem of secondary debugging introduced due to disassembly is avoided.

[0052] When the pump head 31 is connected to the pump head fixing plate 4, it needs to be installed by aligning the positioning pin 6. After the installation is in place, use screws to lock it from the top. Because of the positioning pin 6 and the top locking scheme, the pump head 31 can be disassembled and reassembled twice without affecting the adjusting assembly 5, ensuring the sampling accuracy and service life of the rotary plunger pump, and ensuring that the plunger structure 32 will not be eccentrically worn during use.

[0053] Please refer to Figure 5 The pump head fixing plate 4 is of an inverted U-shaped structure. One side plate of the pump head fixing plate 4 is provided with a first central hole 41 for installing the connecting shaft 512. On both sides of the first central hole 41, second positioning holes 42 for cooperating with the positioning posts 511 are provided along the horizontal direction. On both sides of the first central hole 41, first threaded holes 43 are provided along the diagonal direction. A bearing is provided in the first central hole 41. The other side plate of the pump head fixing plate 4 is provided with a second central hole 44 for installing the locking screw 7 and second threaded holes 45 provided on both sides of the second central hole 44 along the horizontal direction.

[0054] It can be understood that the positioning posts 511 at both ends of the adjusting dial 51 are inserted into the second positioning holes 42, and at the same time, the connecting shaft 512 of the adjusting dial 51 is inserted into the first central hole 41. Then, the adjusting nut 52 is sleeved on the outer circumference of the connecting shaft 512, and the adjusting nut 52 is fixedly tightened with the adjusting dial 51 by screws. Then, the screws in the first threaded holes 43 are loosened so that when the adjusting nut 52 is rotated, the adjusting nut 52 can drive the adjusting dial 51 with equal arm lengths to make a circular motion. The positioning posts 511 of the adjusting dial 51 cooperate with the second positioning holes 42 on the pump head fixing plate 4, thereby converting the rotation of the adjusting dial 51 into the swing of the pump head fixing plate 4, so that the axis of the inner sleeve of the pump head assembly 3 and the axis of the main shaft 11 of the motor 1 form a certain angle (adjustable within a certain range), thereby realizing the adjustment of the telescopic stroke of the plunger structure 32 and achieving the purpose of adjusting the pump volume.

[0055] In this embodiment, the other side of the pump head fixing plate 4 locks and fixes the pump head fixing plate 4 and the motor fixing plate 2 through the locking screw 7, and also locks the pump head fixing plate 4 and the motor fixing plate 2 through the cooperation of the screws and the second threaded holes 45. Since the pump head fixing plate 4 is symmetrically stressed, there will be no eccentric jamming during operation. A bearing can also be added to the outer ring of the connecting shaft 512 of the adjusting dial 51, and the bearing is arranged in the first central hole 41 to reduce the friction between the connecting shaft 512 and the pump head fixing plate 4 and further improve the smoothness of the adjustment.

[0056] Please refer to Figure 6, the motor fixing plate 2 is of a U-shaped structure and sleeved on the outside of the pump head fixing plate 4. A through hole matching with the output end of the motor 1 is provided at the bottom of the motor fixing plate 2. A first central round hole 21 matching with the first central hole 41 is provided on one side plate of the motor fixing plate 2. Two symmetric first arc-shaped long holes 22 are provided on both sides of the first central round hole 21 along the diagonal direction. A second central round hole 23 matching with the second central hole 44 is provided on the other side plate of the motor fixing plate 2. Two symmetric second arc-shaped long holes 24 are provided on both sides of the second central round hole 23 along the horizontal square direction.

[0057] It should be noted that the motor 1 and the motor fixing plate 2 are fixed together. The second central hole 44, the second threaded hole 45, and the first threaded hole 43 on the pump head fixing plate 4 are respectively assembled with the second central round hole 23, the second arc-shaped long hole 24, and the first arc-shaped long hole 22 on the motor fixing plate 2 through screws. Then, the positioning post 511 and the connecting shaft 512 of the adjusting dial tooth 51 are respectively assembled with the first central hole 41 and the second positioning hole 42 on the pump head fixing plate 4. The adjusting nut 52 is installed on the connecting shaft 512, and the adjusting nut 52 and the adjusting dial tooth 51 are tightly connected together by screws. However, there is a certain axial clearance relative to the motor fixing plate 2 and the pump head fixing plate 4, so that the adjusting assembly 5 has no subordinate relationship with the rotary plunger pump and is independent of the rotary plunger pump. If the adjusting assembly 5 is loose, it will not cause the inaccuracy of the pump volume of the rotary plunger pump.

[0058] When it is necessary to adjust the pump volume of the rotary plunger pump, by rotating the adjusting nut 52 clockwise, the adjusting dial tooth 51 drives the pump head fixing plate 4 to swing clockwise. The swinging range depends on the sizes of the first arc-shaped long hole 22 and the second arc-shaped long hole 24 on the motor fixing plate 2. The larger the sizes of the first arc-shaped long hole 22 and the second arc-shaped long hole 24, the larger the adjusted liquid volume. By matching different motor fixing plates 2, different gradient liquid volume ranges can be obtained. When the preset liquid volume is adjusted, first tighten the locking screw 7, and then lock the screws in the first arc-shaped long hole 22 and the second arc-shaped long hole 24, and the liquid volume debugging of the rotary plunger pump is completed.

[0059] Among them, all the adjusting or fastening screw sizes on the rotary plunger pump are the same, so that the pump volume debugging of the entire rotary plunger pump can be completed with only one tool.

[0060] In the above embodiment, the main shaft 11 is rotationally connected to the plunger structure 32 through the bearing assembly 8.

[0061] It can be understood that by setting the bearing assembly 8, the end of the plunger structure 32 can be rotationally connected to the main shaft 11 of the motor 1, so that the motor 1 can drive the plunger structure 32 to rotate.

[0062] As a preferred embodiment, the bearing assembly 8 includes a bearing housing 81 connected to the main shaft 11, and also includes a universal bearing 82 provided on the bearing housing 81. The universal bearing 82 is rotatably connected to the bottom end of the plunger structure 32.

[0063] It should be noted that when the motor 1 operates, the power of the motor 1 is output through the main shaft 11 to drive the bearing housing 81 to rotate synchronously, further driving the universal bearing 82 to rotate synchronously, thereby driving the plunger structure 32 to rotate.

[0064] Among them, in this embodiment, the motor 1 is a stepping motor 1, but in practical applications, there is no limitation on this, as long as the above technical effects can be achieved.

[0065] Please refer to Figure 1 、 Figure 2 and Figure 7 , an origin sensor 9 connected to the controller is provided on the motor fixing plate 2, and an arc-shaped baffle 10 is circumferentially provided at the bottom end of the bearing housing 81. The origin sensor 9 is used to detect the initial position of the arc-shaped baffle 10.

[0066] It can be understood that the origin sensor 9 performs zero-point detection on the arc-shaped baffle 10 when the rotary plunger pump is first used and when the rotary plunger pump is initialized, and sends the detected structure to the controller. The controller determines whether the position of the arc-shaped baffle 10 is the zero-point position and proceeds to the next process.

[0067] In the above embodiment, an O-ring 33 and a sealing ring 34 are provided circumferentially on the plunger structure 32.

[0068] It should be noted that the O-ring 33 is provided to seal the plunger structure 32 and the inner sleeve, and the sealing ring 34 is provided to seal the end face of the inner sleeve and the pump head fixing plate 4 to ensure the sealing performance of the inner sleeve.

[0069] For the assembled rotary plunger pump, the adjusting nut 52 is rotated to drive the adjusting tooth 51, thereby driving the pump head fixing plate 4 to generate a certain angular deviation to achieve the purpose of preliminary adjustment of the liquid injection volume. After preliminary fixation, the adjusting nut 52 and the adjusting tooth 51 are precisely adjusted according to the liquid injection volume. After the rotary plunger pump is adjusted to the required liquid volume, the pump head fixing plate 4 is locked with screws. Preliminary fixation means that the pump head 31 and the pump head fixing plate 4 can rotate through the adjusting nut and have a slight sense of resistance, and the screw is in a state of slightly contacting the pump head fixing plate 4.

[0070] In summary, the volume adjustment device of the rotary plunger pump provided by the present utility model has the characteristics of simple structure, compactness, convenient debugging, short debugging cycle, etc. The debugging of different liquid volumes of the rotary plunger pump can be completed only by using a common tool, and structural damage can be avoided. It can be reused within the service life, improving the maintenance convenience of the rotary plunger pump. Through the structural design, the pump head 31 is convenient to disassemble, facilitating the maintenance of the pump head 31 and the replacement of the sealing ring 34, ensuring that the disassembly operation can be carried out without disassembling the adjustment component 5. The pump head 31 is detachable and has a positioning function to improve the maintenance convenience of the rotary plunger pump and avoid the problem of introducing secondary debugging due to disassembly.

[0071] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0072] The various embodiments in this specification are described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0073] The above has introduced in detail a volume adjustment device of a rotary plunger pump provided by the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art of this technology, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A rotary piston pump volume adjustment device, characterized in that: include: A motor fixing plate (2) for mounting a motor (1) and a pump head fixing plate (4) for mounting a pump head assembly (3) are arranged opposite to each other. The pump head fixing plate (4) is nested in the motor fixing plate (2) and is movably connected to the motor fixing plate (2). The position of the pump head fixing plate (4) relative to the motor fixing plate (2) is adjusted by an adjustment component (5) to adjust the angle between the axis of the inner sleeve of the pump head assembly (3) and the axis of the main shaft (11) of the motor (1). The adjustment component (5) is clearance-matched with both the motor fixing plate (2) and the pump head fixing plate (4).

2. The rotary piston pump volume regulating device according to claim 1, characterized in that: The adjustment assembly (5) comprises an adjustment tooth (51) for adjusting the position of the pump head fixing plate (4), and also comprises an adjustment nut (52) for controlling the rotation of the adjustment tooth (51); the adjustment nut (52) and the adjustment tooth (51) are fixed by screws.

3. The rotary piston pump volume regulating device according to claim 2, characterized in that: The adjusting tooth (51) is a diamond-shaped structure, positioning columns (511) are provided at both ends of the adjusting tooth (51), and a connecting shaft (512) is provided at the center of the adjusting tooth (51), and the connecting shaft (512) is a hollow structure.

4. The rotary piston pump volume regulating device according to claim 3, characterized in that: The pump head assembly (3) comprises a pump head (31) for mounting the inner sleeve and a plunger structure (32) telescopically movable along the inner sleeve; the pump head (31) is detachably mounted on the pump head fixing plate (4); two positioning pins (6) are disposed at the bottom of the pump head (31); and the pump head fixing plate (4) is provided with two first positioning holes corresponding one to the positioning pins (6).

5. The rotary piston pump volume regulating device according to claim 4, characterized in that: The pump head fixing plate (4) is an inverted U-shaped structure. A first center hole (41) for mounting the connecting shaft (512) is provided on one side plate of the pump head fixing plate (4). Second positioning holes (42) cooperating with the positioning column (511) are provided on both sides of the first center hole (41) in a horizontal direction. First threaded holes (43) are provided on both sides of the first center hole (41) in a diagonal direction. A bearing is provided in the first center hole (41). A second center hole (44) for mounting a locking screw (7) and second threaded holes (45) are provided on both sides of the second center hole (44) in a horizontal direction on the other side plate of the pump head fixing plate (4).

6. The rotary piston pump volume regulating device according to claim 5, characterized in that: The motor fixing plate (2) is a U-shaped structure and is sleeved on the outer side of the pump head fixing plate (4). The bottom of the motor fixing plate (2) is provided with a through hole that matches with the output end of the motor (1). A side plate of the motor fixing plate (2) is provided with a first center circular hole (21) that matches with the first center hole (41). Two first arc-shaped long holes (22) are symmetrically provided on both sides of the first center circular hole (21) along a diagonal direction. The other side plate of the motor fixing plate (2) is provided with a second center circular hole (23) that matches with the second center hole (44). Two second arc-shaped long holes (24) are symmetrically provided on both sides of the second center circular hole (23) along a horizontal square.

7. The rotary piston pump volume regulating device according to claim 4, characterized in that: The main shaft (11) is rotationally connected to the plunger structure (32) via a bearing assembly (8).

8. The rotary piston pump volume regulating device according to claim 7, characterized in that: The bearing assembly (8) comprises a bearing seat (81) connected to the main shaft (11), and also comprises a universal bearing (82) arranged on the bearing seat (81), wherein the universal bearing (82) is rotatably connected to the bottom end of the plunger structure (32).

9. The rotary piston pump volume regulating device according to claim 8, characterized in that: An origin sensor (9) connected to a controller is provided on the motor fixing plate (2), an arc-shaped baffle (10) is provided in the circumferential direction of the bottom end of the bearing seat (81), and the origin sensor (9) is used to detect the initial position of the arc-shaped baffle (10).

10. The rotary piston pump capacity adjustment device according to any one of claims 7 to 9, characterized in that: An O-ring (33) and a sealing ring (34) are provided in the circumference of the plunger structure (32).

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