High-speed precision metering pump based on direct drive technology

Abstract

The utility model discloses a high-speed precision metering pump based on a direct drive technology, which comprises a pump shell, a linear motor is fixed on the pump shell, a plunger capable of moving axially is arranged in the pump shell, a movable shaft of the linear motor is connected with the plunger, a pump head is arranged at the front end of the pump shell, and the pump head is connected with the plunger. A feeding port is formed in the side face of the pump head, a discharging port is formed in the front end face of the pump head, and a rotary valve controlled by an actuator is arranged in the pump head. The plunger type metering pump has the advantages that the structure is simple and reasonable, transmission structures such as a lead screw and a lead screw nut can be omitted by adopting the linear motor adopting the direct drive technology as a power source for moving the plunger, the structure of the metering pump is greatly simplified, parts are reduced, and the manufacturing and maintenance cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of metering pump manufacturing, and particularly relates to a high-speed precision metering pump based on direct drive technology. Background Art

[0002] In the production processes of many industries such as the pharmaceutical industry, food industry, and pharmaceutical manufacturing industry, there is a filling process. During the filling process, a metering pump is generally used for liquid transportation.

[0003] The metering pump is powered by a driving device. Traditional metering pumps mostly use servo motors. The servo motor drives the lead screw to rotate. A lead screw nut is screwed onto the lead screw, and then the lead screw nut drives the plunger to reciprocate. Its structure is relatively complex, with many components, troublesome assembly, and high processing requirements for the assembly connection points, resulting in high manufacturing and maintenance costs. Therefore, the existing metering pump structure needs to be further improved. Summary of the Utility Model

[0004] The purpose of the utility model is to make up for the above deficiencies and disclose to the society a high-speed precision metering pump based on direct drive technology, which has a simple and reasonable structure, convenient assembly, and low manufacturing and maintenance costs.

[0005] The technical solution of the utility model is realized as follows:

[0006] A high-speed precision metering pump based on direct drive technology includes a pump housing. A linear motor is fixed on the pump housing. A plunger that can move axially is arranged inside the pump housing. The moving shaft of the linear motor is connected to the plunger. A pump head is arranged at the front end of the pump housing. A feed port is arranged on the side surface of the pump head. A discharge port is arranged on the front end face of the pump head. A rotary valve controlled by an actuator is arranged inside the pump head.

[0007] The measures to further optimize the technical solution are as follows:

[0008] As an improvement, the actuator includes a cylinder. A piston rod is arranged inside the cylinder. A rack is arranged on the piston rod. The rack meshes with a gear shaft. The gear shaft is connected to the rotary valve. The actuator drives the rotary valve to complete the switching of the inlet and outlet by the movement of the piston rod, which drives the gear shaft to rotate through the rack on the piston rod.

[0009] As an improvement, an end cover is fixed at the front end of the pump housing. A plunger bushing is arranged inside the pump housing. A conical surface is arranged at the front end of the plunger bushing. The plunger bushing is hermetically connected to the conical surface of the end cover. The conical surface seal is adopted to increase the sealing contact surface, thereby increasing the reliability of the seal.

[0010] As an improvement, a plunger seal is fixed to the front end of the plunger, and the plunger seal is in sliding and sealing fit with the inner hole of the plunger bushing.

[0011] As an improvement, a mounting bracket is fixed to the rear end of the pump housing, and the linear motor is fixed to the mounting bracket.

[0012] As an improvement, the four corners of the end cover are respectively connected to the mounting bracket by stud bolts. By using the stud bolts to generate tension, the end cover and the mounting bracket can be closely attached to the end of the pump housing.

[0013] As an improvement, a coupling is connected to the moving shaft of the linear motor, and the coupling is connected to the plunger through a transmission rod.

[0014] As an improvement, hoop collars are respectively arranged at the feed port and the discharge port. The arrangement of the hoop collars facilitates the connection of the material pipes at the feed port and the discharge port.

[0015] As an improvement, the linear motor is a magnetic axis linear motor.

[0016] The advantages of the present utility model compared with the prior art are:

[0017] A high-speed precision metering pump based on direct drive technology of the present utility model has a simple and reasonable structure. By using a linear motor based on direct drive technology as the power source for the movement of the plunger, transmission structures such as lead screws and lead screw nuts can be omitted, greatly simplifying the structure of the metering pump, reducing the number of components, and being able to reduce the manufacturing and maintenance costs; in addition, the switching between the feed state and the discharge state is completed by a rotary valve controlled by an actuator, with a simple structure and fast switching. Description of the Drawings

[0018] Figure 1 is a three-dimensional structure diagram of an embodiment of the present utility model;

[0019] Figure 2 is a sectional structure diagram of an embodiment of the present utility model;

[0020] Figure 3 is a sectional structure diagram of the actuator of an embodiment of the present utility model;

[0021] Figure 4 is a sectional structure diagram of the pump in the feed state of the present utility model;

[0022] Figure 5 is a sectional structure diagram of the pump in the discharge state of the present utility model.

[0023] The names of the reference numerals in the drawings of the present utility model are:

[0024] Pump housing 1, end cover 11, stud 12, linear motor 2, movable shaft 21, coupling 22, transmission rod 23, plunger 3, plunger seal 31, pump head 4, feed port 4a, discharge port 4b, actuator 5, cylinder 51, piston rod 52, rack 52a, gear shaft 53, rotary valve 6, plunger bushing 7, conical surface 7a, mounting bracket 8, ferrule 9. Detailed implementation mode

[0025] The present utility model will be further described in detail below with reference to the accompanying drawings:

[0026] The following description is used to disclose the present utility model so that those skilled in the art can implement the present utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious deformations. The basic principles defined in the following description can be used in other implementation schemes, deformation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not depart from the spirit and scope of the present utility model.

[0027] Those skilled in the art should understand that in the disclosure of the present utility model, the terms "longitudinal", "lateral", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or position based on the orientation or position relationship shown in the drawings. It is only for the convenience of describing the present utility model and is a simplified description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present utility model.

[0028] It can be understood that the term "one" should be understood as "at least one" or "one or more". That is, in one embodiment, the number of an element can be one, and in other embodiments, the number of the element can be multiple. The term "one" should not be construed as limiting the quantity.

[0029] As Figures 1 to 5 shown, a high-speed precision metering pump based on direct drive technology includes a pump housing 1. A linear motor 2 is fixed on the pump housing 1. A plunger 3 that can move axially is arranged in the pump housing 1. The movable shaft 21 of the linear motor 2 is connected to the plunger 3. A pump head 4 is arranged at the front end of the pump housing 1. A feed port 4a is arranged on the side of the pump head 4. A discharge port 4b is arranged on the front end face of the pump head 4. A rotary valve 6 controlled by an actuator 5 is arranged in the pump head 4.

[0030] For the metering pump of the present utility model, by using a linear motor 2 employing direct drive technology as the power source for the reciprocating motion of the plunger 3, the transmission structures such as the lead screw and the lead screw nut in the traditional metering pump can be omitted, greatly simplifying the structure of the metering pump, reducing the components, and being able to lower the manufacturing and maintenance costs. In this embodiment, the feed port 4a and the discharge port 4b are vertically arranged, and the rotary valve 6 controlled by the actuator 5 rotates, thereby completing the switching between the feed state and the discharge state. The structure is reasonable, and the switching is convenient and fast.

[0031] In this embodiment, the actuator 5 employs direct drive technology. Specifically, the actuator 5 includes a cylinder 51, a piston rod 52 is arranged in the cylinder 51, a rack 52a is arranged on the piston rod 52, the rack 52a meshes with a gear shaft 53, and the gear shaft 53 is connected to the rotary valve 6. Through air source control, the movement of the piston rod 52 in the cylinder 51 is realized. The rack 52a on the piston rod 52 drives the gear shaft 53 to rotate, and then the gear shaft 53 drives the rotary valve 6 to rotate. The rotary valve 6 includes a solid part and a cavity part.

[0032] A end cover 11 is fixed at the front end of the pump housing 1. A plunger bushing 7 is arranged in the pump housing 1. A conical surface 7a is arranged at the front end of the plunger bushing 7. The plunger bushing 7 is in conical surface sealing connection with the end cover 11. The conical surface sealing is adopted between the plunger bushing 7 and the end cover 11, increasing the area of the sealing contact surface, thereby improving the sealing reliability.

[0033] A plunger seal 31 is fixed at the front end of the plunger 3. The plunger seal 31 is in sliding sealing fit with the inner hole of the plunger bushing 7.

[0034] An installation bracket 8 is fixed at the rear end of the pump housing 1. The linear motor 2 is fixed on the installation bracket 8. The setting of the installation bracket 8 facilitates the fixation of the linear motor 2.

[0035] The four corners of the end cover 11 and the installation bracket 8 are respectively connected by stud bolts 12.

[0036] The end cover 11 and the installation bracket 8 are connected and fixed by the stud bolts 12. By using the tensile force generated by the stud bolts 12, the end cover 11 and the installation bracket 8 can be closely attached to the end face of the pump housing 1.

[0037] A coupling 22 is connected to the moving shaft 21 of the linear motor 2. The coupling 22 is connected to the plunger 3 through a transmission rod 23.

[0038] Sleeves 9 are respectively arranged at the feed port 4a and the discharge port 4b. The setting of the sleeves 9 facilitates the connection of the material pipes at the feed port 4a and the discharge port 4b.

[0039] The linear motor 2 described above is a magnetic-axis linear motor.

[0040] As Figure 4 shown, when the metering pump is in the feeding state, the cavity part of the rotary valve 6 is aligned with the feeding port 4a, while the solid part of the rotary valve 6 faces the discharging port 4b. At this time, the feeding port 4a is opened, and the discharging port 4b is closed. The movable shaft 21 of the linear motor 2 moves backward to drive the plunger 3 to move backward, and the material enters the pump from the feeding port 4a; the actuator 5 is activated to drive the rotary valve 6 to rotate, switching from the feeding state to the discharging state. As Figure 5 shown, when the metering pump is in the discharging state, the cavity part of the rotary valve 6 is aligned with the discharging port 4b, while the solid part of the rotary valve 6 faces the feeding port 4a. At this time, the feeding port 4a is closed, and the discharging port 4b is opened. The movable shaft 21 of the linear motor 2 moves forward to drive the plunger 3 to move forward, and the material in the pump is discharged from the discharging port 4b, thereby realizing the transportation of the material.

[0041] The above is only a preferred embodiment of the present utility model, and thus does not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be able to realize that all equivalent replacements and obvious changes made by using the description and illustrations of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high-speed precision metering pump based on direct drive technology, comprising a pump housing (1), characterized in that: A linear motor (2) is fixed on the pump housing (1). A plunger (3) that can move axially is arranged inside the pump housing (1). The moving shaft (21) of the linear motor (2) is connected to the plunger (3). A pump head (4) is arranged at the front end of the pump housing (1). A feed port (4a) is arranged on the side surface of the pump head (4). A discharge port (4b) is arranged on the front end face of the pump head (4). A rotary valve (6) controlled by an actuator (5) is arranged inside the pump head (4).

2. The high-speed precision metering pump based on direct drive technology according to claim 1 is characterized in that: The actuator (5) includes a cylinder (51). A piston rod (52) is arranged inside the cylinder (51). A rack (52a) is arranged on the piston rod (52). The rack (52a) meshes with a gear shaft (53). The gear shaft (53) is connected to the rotary valve (6).

3. The high-speed precision metering pump based on direct drive technology according to claim 2, characterized in that: An end cover (11) is fixed at the front end of the pump housing (1). A plunger bushing (7) is arranged inside the pump housing (1). A conical surface (7a) is arranged at the front end of the plunger bushing (7). The plunger bushing (7) is connected to the end cover (11) in a conical surface sealing manner.

4. The high-speed precision metering pump based on direct drive technology according to claim 3, characterized in that: A plunger seal (31) is fixed at the front end of the plunger (3). The plunger seal (31) is in sliding seal fit with the inner hole of the plunger bushing (7).

5. The high-speed precision metering pump based on direct drive technology according to claim 4, characterized in that: An installation bracket (8) is fixed at the rear end of the pump housing (1). The linear motor (2) is fixed on the installation bracket (8).

6. The high-speed precision metering pump based on direct drive technology according to claim 5, characterized in that: The four corners of the end cover (11) and the installation bracket (8) are respectively connected by stud bolts (12).

7. The high-speed precision metering pump based on direct drive technology according to claim 6, characterized in that: A coupling (22) is connected to the moving shaft (21) of the linear motor (2). The coupling (22) is connected to the plunger (3) through a transmission rod (23).

8. The high-speed precision metering pump based on direct drive technology according to claim 7, characterized in that: Hoop collars (9) are respectively arranged at the feed port (4a) and the discharge port (4b).

9. The high-speed precision metering pump based on direct drive technology according to claim 8, characterized in that: The linear motor (2) is a magnetic axis linear motor.

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