Plunger pump based on rotating nut structure

Abstract

The utility model relates to a plunger pump based on a rotating nut structure. The plunger pump is used for pressurizing and conveying liquid to be conveyed. The plunger pump comprises an outer pipe and a lead screw nut mechanism arranged in the outer pipe, the lead screw nut mechanism comprises a lead screw capable of reciprocating in the linear direction, and the lead screw is located in the outer pipe; the two pump structures are arranged on the two sides of the lead screw nut mechanism in the moving direction of the lead screw, each pump structure comprises a pump body fixedly connected with the outer pipe, and a plunger is assembled in each pump body in a sliding mode; the plunger pump further comprises a guide connecting structure which comprises a transition plate, and the transition plate is connected with the end of the lead screw and the end of the plunger. The guide connecting structure further comprises a guide sleeve arranged on the transition plate, and the guide sleeve and the outer pipe are assembled together in a rotation stopping and sliding mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of plunger pumps, and in particular relates to a plunger pump based on a rotating nut structure. Background Art

[0002] The plunger pump is a device that realizes pressurized liquid delivery. It relies on the reciprocating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve the functions of sucking and pressurizing liquid. The plunger pump has the advantages of high rated pressure and compact structure.

[0003] The traditional plunger pump uses an eccentric wheel and a connecting rod to drive the plunger to reciprocate, but it has two disadvantages: on the one hand, the transmission is achieved through the eccentric wheel and the connecting rod, and the torque angle is constantly changing. The plunger cannot maintain uniform motion and the delivery pressure is always fluctuating. On the other hand, the eccentric wheel and the connecting rod can only drive one plunger to reciprocate, and the working efficiency is low.

[0004] To solve these problems, a screw-nut mechanism is used in the prior art to drive two plungers to reciprocate. Its structural form is shown in the Chinese invention patent application with application publication number CN107605852A. Its structure includes: a delivery cylinder, a delivery rod, a piston, a driving mechanism and a control unit. The linear reciprocating motion of the plunger is realized through a ball screw-type driving structure, so that the output pressure is more stable. At the same time, the linear reciprocating motion of the plunger can simultaneously drive the two pistons to move.

[0005] However, the plunger pump in this technology uses a clamp with a circular groove to connect the ball screw and the piston, which requires high coaxial accuracy between the ball screw and the piston connecting rod during connection and installation. The ball screw, piston connecting rod and connecting and fixing parts need to maintain higher accuracy during production. During the installation process, the axis of the ball screw must also correspond to the axis of the piston connecting rod. Otherwise, the horizontal thrust of the ball screw and the piston connecting rod cannot always be stably maintained coaxial. This connection method has high requirements for processing and assembly, which increases the processing and assembly costs of the plunger pump. Utility Model Content

[0006] The utility model provides a plunger pump based on a rotating nut structure to solve the technical problems in the prior art that the plunger pump requires high coaxial accuracy of a ball screw and a piston connecting rod during connection and installation, and has high processing and assembly requirements.

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] A plunger pump based on a rotating nut structure comprises: an outer tube and a screw nut mechanism arranged in the outer tube, the screw nut mechanism comprising a screw capable of reciprocating in a linear direction, the screw being located in the outer tube; two pump structures, which are arranged on both sides of the screw nut mechanism along the moving direction of the screw, the pump structure comprising a pump body fixedly connected to the outer tube, a plunger being slidably mounted in the pump body; the plunger pump further comprises a guide connection structure, comprising a transition plate, the transition plate connecting the end of the screw and the end of the plunger; the guide connection structure further comprises a guide sleeve arranged on the transition plate, the guide sleeve being slidably mounted together with the outer tube in a rotationally fixed manner.

[0009] The beneficial effect is as follows: the utility model adopts a transition plate to connect the lead screw and the plunger. Even if the lead screw and the plunger are not kept coaxial after assembly, as long as they can be connected to the transition plate at the same time, the lead screw can drive the plunger to reciprocate through the transition plate. In actual use, a suitable transition plate can be selected for connection according to the relative positions of the lead screw and the plunger. There is no need to require the lead screw and the plunger to be coaxial like traditional clamps, couplings and other structures, and the requirements for processing accuracy and assembly accuracy are relatively low. Moreover, the utility model fixes the guide sleeve on the transition plate, guides the movement of the lead screw through the guide sleeve, and does not need to install a guide structure at other positions of the lead screw. The guide connection structure of the utility model integrates connection and guidance, has more concentrated functions and a more compact structure. The plunger pump of the utility model can realize any number of side-by-side arrangements and realize modular arrangements. When in use, the plunger pumps of a specified number and a specified position can be started as needed and start working at a specified time, thereby obtaining a stable liquid flow.

[0010] Furthermore, at least one of the lead screw and the plunger is detachably connected to the transition plate by bolts, which is convenient for separate processing and subsequent replacement.

[0011] Furthermore, the plunger has a flange at one end facing the screw, and bolt holes are provided on the flange and the transition plate. The end of the guide sleeve is correspondingly provided with a threaded hole. The transition connection structure includes a first bolt that passes through the flange, the transition plate and is screwed into the guide sleeve, and a second bolt that passes through the transition plate and the screw and is screwed into the screw.

[0012] Furthermore, a first mounting sleeve is arranged protruding from one end of the transition plate toward the lead screw, the end of the guide sleeve is adapted to be mounted on the first mounting sleeve, and a sealing ring is arranged between the guide sleeve and the first mounting sleeve. The guide sleeve and the first mounting sleeve can realize radial positioning between the transition plate and the lead screw.

[0013] Furthermore, a plunger mounting sleeve is protruding from the end of the plunger, and a second mounting sleeve adapted to be mounted on the outside of the plunger mounting sleeve is provided at the right end of the transition plate. The plunger mounting sleeve and the second mounting sleeve can realize radial positioning between the transition plate and the plunger.

[0014] Furthermore, the guide sleeve comprises a sleeve body and a guide block arranged on the sleeve body, and the guide block is slidably assembled with the outer tube guide.

[0015] Furthermore, the outer tube includes a first outer tube part and a second outer tube part which are arranged separately, the guide sleeve is guided and matched with the first outer tube part, the second outer tube part connects the first outer tube part and the pump body, and the second outer tube part is arranged opposite to the transition plate.

[0016] Furthermore, the screw nut mechanism includes a servo motor and a planetary reducer located outside the outer tube, and also includes a nut connected to the planetary reducer through a spur gear set, and the nut cooperates with the screw; the motor and the planetary reducer are located at the top of the outer tube. Through the precise control of the servo motor, the speed of the plunger movement can be controlled, thereby controlling the flow of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 It is the front view of the plunger pump based on the rotating nut structure;

[0019] Figure 2 It is a cross-sectional view of a plunger pump based on a rotating nut structure;

[0020] Figure 3 for Figure 2 A partial enlarged view of the guide connection structure;

[0021] Figure 4 This is a schematic diagram of the structure in which multiple plunger pumps are arranged together.

[0022] Description of reference numerals:

[0023] 1—servo motor; 2—planetary reducer; 3—spur gear set; 4—support housing; 5—nut; 6—screw; 7—outer tube; 7-1—first part of outer tube; 7-2—second part of outer tube; 8—guide sleeve; 9—liquid delivery outlet; 10—pump body; 11—liquid delivery inlet; 12—support base; 13—plunger; 14—guide block; 15—transition plate; 15-1—first mounting sleeve; 15-2—second mounting sleeve; 16—first bolt; 17—second bolt. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0025] An embodiment of a plunger pump based on a rotating nut structure:

[0026] like Figures 1 to 3 As shown, a plunger pump based on a rotating nut structure (hereinafter referred to as a plunger pump) includes a support base 12, a support box 4, two outer tubes 7, a screw nut mechanism, two pump structures and two guide connection structures.

[0027] The support base 12 is a mounting base for the plunger pump. The support box 4 is fixedly mounted on the support base 12. The outer tube 7 is fixedly mounted outside the support box 4. The outer tube 7 includes an outer tube first portion 7-1 and an outer tube second portion 7-2. One end of the outer tube first portion 7-1 is connected to the support box 4 by bolts, and the other end is connected to the outer tube second portion 7-2 by bolts.

[0028] The screw nut mechanism includes a servo motor 1, a planetary reducer 2, a spur gear set 3, a nut 5, and a screw 6. The servo motor 1 is located at the top of the outer tube 7 and serves as a driving mechanism to provide power for the plunger pump. The planetary reducer 2 is connected to the servo motor 1. The planetary reducer 2 is fixedly mounted on the support housing 4. The spur gear set 3 is installed in the support housing 4. The spur gear set 3 is connected to the planetary reducer 2. The nut 5 is rotatably mounted in the support housing 4 through a bearing. The spur gear set 3 includes a driving gear connected to the planetary reducer 2 and a driven gear fixedly sleeved on the outside of the nut 5. The spur gear set 3 can drive the nut 5 to rotate. The screw 6 passes through the nut 5 and is threadedly connected to the screw 6. The screw 6 is guided by the guide connection structure to prevent the screw 6 from rotating. The servo motor 1 drives the screw 6 to reciprocate through the planetary reducer 2, the spur gear set 3, and the nut 5.

[0029] The pump structure includes a pump body 10 fixedly connected to the second part 7-2 of the outer tube, and a plunger 13 is slidably mounted in the pump body 10. In the moving direction of the screw 6, the two pump structures are disposed at both ends of the screw nut mechanism. The plungers 13 of the two pump structures transmit horizontal thrust by the same screw 6, alternately completing the action of sucking in and pressing out the liquid to be transported, so that the plunger pump can continuously output the liquid to be transported. A delivery liquid inlet 11 and a delivery liquid outlet 9 are provided in the pump body 10, wherein a liquid inlet valve is provided at the delivery liquid inlet 11, and a liquid outlet valve is provided at the delivery liquid outlet 9, the liquid inlet valve is a one-way valve that allows liquid to flow from the outside to the inside of the pump body 10, and the liquid outlet valve is a one-way valve that allows liquid to flow from the inside of the pump body 10 to the outside. Through the volume change of the sealed working chamber in the pump body 10, the function of sucking in liquid and pressurizing liquid is finally realized.

[0030] The function of the guide connection structure is to connect the plunger 13 and the lead screw 6, and includes a transition plate 15 and a guide sleeve 8. The transition plate 15 connects the end of the lead screw 6 and the end of the plunger 13. Specifically, Figure 3 As shown, the end of the plunger 13 has a flange, and the flange and the edge of the transition plate 15 are provided with bolt holes, and the guide sleeve 8 is provided with a threaded hole. The first bolt 16 penetrates the flange and the transition plate 15 and is screwed into the guide sleeve 8, so that the plunger 13 is fixedly mounted on the transition plate 15. The end of the plunger 13 has a threaded hole, and the middle position of the transition plate 15 has a bolt hole. The second bolt 17 penetrates the transition plate 15 and is screwed into the plunger 13.

[0031] In order to realize the radial positioning between the transition plate 15 and the plunger 13 and between the transition plate 15 and the lead screw 6, the transition plate 15 has a first mounting sleeve 15-1 at one end and a second mounting sleeve 15-2 at the other end. The end of the guide sleeve 8 is adapted to be mounted on the first mounting sleeve 15-1, and a sealing ring is provided between the guide sleeve 8 and the first mounting sleeve 15-1. The end of the plunger 13 is protrudingly provided with a plunger mounting sleeve, which is adapted to be mounted on the outside of the second mounting sleeve 15-2.

[0032] The guide sleeve 8 comprises a sleeve body and a guide block 14 arranged on the sleeve body, and the guide block 14 is slidingly assembled with the first portion 7-1 of the outer tube. Specifically, the guide block 14 is fixedly mounted on the sleeve body by bolts.

[0033] like Figure 4 As shown, since the plunger pump in the utility model is driven by a screw nut mechanism, the pump body 10 is arranged at both ends of the screw nut mechanism, and the side-by-side arrangement of any number of plunger pumps can be realized to achieve a modular arrangement. When in use, a specified number of plunger pumps at specified positions can be started at a specified time as needed. For example, the start time of two adjacent plunger pumps is staggered to ensure that when one of the plunger pumps sucks in liquid, the other plunger pump presses the liquid, thereby ensuring the overall flow stability.

[0034] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as "upper", "lower", "front", "back", "left", "right", "width", "horizontal", "top", "bottom", "inside", "outside" (this part of the text needs to be adjusted and replaced according to the text used in each case) and other terms indicating orientation or position relationship are based on the orientation or position relationship shown in the drawings of this specification, which are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limitations on the scheme of the utility model.

[0035] In addition, in the description of this specification, “plurality” means at least two, for example, two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A plunger pump based on a rotating nut structure, comprising: An outer tube (7) and a screw nut mechanism disposed in the outer tube (7), wherein the screw nut mechanism comprises a screw (6) capable of reciprocating in a linear direction, and the screw (6) is disposed in the outer tube (7); Two pump structures are disposed on both sides of the lead screw nut mechanism along the moving direction of the lead screw (6), the pump structure comprising a pump body (10) fixedly connected to the outer tube (7), and a plunger (13) is slidably mounted in the pump body (10); Characterized in that the plunger pump also includes: The guide connection structure comprises a transition plate (15) which connects the end of a lead screw (6) and the end of a plunger (13); the guide connection structure also comprises a guide sleeve (8) arranged on the transition plate (15), wherein the guide sleeve (8) and an outer tube (7) are slidably assembled together in a rotationally fixed manner.

2. The plunger pump based on the rotating nut structure according to claim 1, characterized in that: At least one of the lead screw (6) and the plunger (13) is detachably connected to the transition plate (15) via bolts.

3. The plunger pump based on the rotating nut structure according to claim 2, characterized in that: The plunger (13) has a flange at one end facing the lead screw (6), and bolt holes are provided on the flange and the transition plate (15). The end of the guide sleeve (8) is correspondingly provided with a threaded hole, and the transition connection structure includes a first bolt (16) that penetrates the flange and the transition plate (15) and is screwed into the guide sleeve (8).

4. The plunger pump based on the rotating nut structure according to claim 2, characterized in that: A first mounting sleeve (15-1) is protruding from one end of the transition plate (15) facing the lead screw (6), an end of the guide sleeve (8) is adaptively mounted on the first mounting sleeve (15-1), and a sealing ring is provided between the guide sleeve (8) and the first mounting sleeve (15-1).

5. The plunger pump based on the rotating nut structure according to claim 2, characterized in that: A plunger mounting sleeve is protruding from the end of the plunger (13), and a second mounting sleeve (15-2) adapted to be mounted outside the plunger mounting sleeve is provided at the right end of the transition plate (15).

6. The plunger pump based on a rotating nut structure according to any one of claims 1 to 5, characterized in that: The guide sleeve (8) comprises a sleeve body and a guide block (14) arranged on the sleeve body, and the guide block (14) is assembled with the outer tube (7) in a guiding sliding manner.

7. The plunger pump based on a rotating nut structure according to any one of claims 1 to 5, characterized in that: The outer tube (7) comprises a first outer tube part (7-1) and a second outer tube part (7-2) which are arranged separately; the guide sleeve (8) is in guiding cooperation with the first outer tube part (7-1); the second outer tube part (7-2) connects the first outer tube part (7-1) and the pump body (10); and the second outer tube part (7-2) is arranged opposite to the transition plate (15).

8. The plunger pump based on a rotating nut structure according to any one of claims 1 to 5, characterized in that: The screw-nut mechanism comprises a servo motor (1) and a planetary reducer (2) located outside the outer tube (7), and also comprises a nut (5) connected to the planetary reducer (2) via a spur gear set (3), and the nut (5) cooperates with the screw (6); The servo motor (1) and the planetary reducer (2) are located on the top of the outer tube (7).

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