Spiral gear pump capable of rotating positively and negatively

Abstract

The utility model discloses a spiral gear pump capable of rotating positively and negatively. The spiral gear pump comprises a pump body, a front bracket, a rear bracket, a pump body connecting bolt, a driving gear shaft, a driven gear shaft, a sliding bearing, a friction plate, a mechanical seal, a mechanical seal cavity and a mechanical seal cavity fixing bolt, compared with the prior art, the oil guide channel is formed in the front support, liquid at the front ends of the driving shaft and the driven shaft is converged, led into the rear support through the central round hole of the driven shaft and returned to the low-pressure inlet end from the backflow hole through the backflow channel; the gear pump can rotate forwards when the rear support is installed forwards, and the gear pump rotates backwards when the rear support rotates by 180 degrees to be installed.

Description

Technical Field

[0001] This utility model relates to the field of gear pump technology, specifically to a reversible helical gear pump. Background Technology

[0002] A gear pump is a rotary pump that transports or pressurizes liquids by relying on the change and movement of the working volume formed between the pump chamber and meshing gears. It consists of two gears, a pump body, and front and rear covers forming two enclosed spaces. When the gears rotate, the volume of the space on the disengaged side increases, creating a vacuum that draws in liquid. Conversely, the volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction and discharge chambers are separated by the meshing line of the two gears. The pressure at the pump outlet depends entirely on the resistance at the outlet. Existing gear pumps often need to consider the pressure relief of the mechanical seal chamber, resulting in gear pumps often only capable of directional rotation and having relatively limited functionality. Utility Model Content

[0003] The purpose of this invention is to provide a reversible helical gear pump to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: It includes a pump body, a front support, a rear support, pump body connecting bolts, a drive gear shaft, a driven gear shaft, a sliding bearing, friction plates, a mechanical seal, a mechanical seal cavity, and mechanical seal cavity fixing bolts; the pump body has a front support and a rear support installed on its front and rear sides, and inlets and outlets on its left and right sides; the pump body connecting bolts pass through the rear support and the pump body and are fixed to the front support; the drive gear shaft is installed on the upper side inside the pump body; the driven gear shaft is installed on the lower side inside the pump body, and has a circular hole in its center that penetrates the entire shaft section; the gear... The gear segment meshes with the drive gear shaft; both the left and right sides of the drive gear shaft and driven gear shaft are equipped with sliding bearings, and both sides of the gear segment are equipped with friction plates; the mechanical seal and mechanical seal cavity are installed on the front side of the drive gear shaft, and the mechanical seal is located inside the mechanical seal cavity; the mechanical seal cavity fixing bolt passes through the mechanical seal cavity and is fixed to the front bracket; the front bracket has an oil guide channel that connects to the leakage hole at the front of the drive gear shaft; the rear bracket has a return hole on the left side and two return channels that connect to the leakage points at the rear ends of the drive gear shaft and driven gear shaft respectively.

[0005] As a preferred embodiment of this utility model, both the drive gear shaft and the driven gear shaft have helical gears.

[0006] As a preferred technical solution of this utility model, the sliding bearing is made of one of the following materials: composite copper bushing, PEEK, and graphite.

[0007] As a preferred technical solution of this utility model, the friction pad is made of one of PEEK, ceramic, or silicon carbide.

[0008] In a preferred embodiment of this invention, the sliding bearing is located inside the pump body.

[0009] In a preferred embodiment of this invention, the sliding bearing is located inside the front bracket and the rear bracket.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This utility model opens an oil guide channel on the front bracket to merge the liquid at the front end of the drive shaft and the driven shaft, introduce it into the rear bracket through the central circular hole of the driven shaft, and return it to the low pressure inlet end through the return channel from the return hole; it can realize that the gear pump rotates forward when the rear bracket is installed in the forward direction, and the gear pump rotates in reverse when the rear bracket is rotated 180° for installation. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view of the present invention;

[0012] Figure 2 This is a front view of the back cover of this utility model;

[0013] In the diagram: 1. Pump body; 2. Front bracket; 3. Rear bracket; 4. Pump body connecting bolts; 5. Driven gear shaft; 6. Driven gear shaft; 7. Sliding bearing; 8. Friction plate; 9. Mechanical seal; 10. Mechanical seal cavity; 11. Mechanical seal cavity fixing bolts; 12. Oil guide channel; 13. Round hole; 14. Return hole; 15. Return channel. Detailed Implementation

[0014] Example 1

[0015] like Figures 1 to 2As shown, this utility model discloses a reversible spiral gear pump, including a pump body 1, a front support 2, a rear support 3, a pump body connecting bolt 4, a driving gear shaft 5, a driven gear shaft 6, a sliding bearing 7, a friction plate 8, a mechanical seal 9, a mechanical seal cavity 10, and a mechanical seal cavity fixing bolt 11. The pump body 1 has the front support 2 and the rear support 3 installed on its front and rear sides, and inlets and outlets on its left and right sides. The pump body connecting bolt 4 passes through the rear support 3 and the pump body 1, and is fixed to the front support 2. The driving gear shaft 5 is installed on the upper side inside the pump body 1. The driven gear shaft 7 is installed on the lower side inside the pump body 1, and has a circular hole 13 in its center that penetrates the entire shaft section. The drive gear shaft 6 has meshing gear segments; both the left and right sides of the drive gear shaft 5 and driven gear shaft 6 are equipped with sliding bearings 7, and both sides of the gear segments are equipped with friction plates 8; the mechanical seal 9 and the mechanical seal cavity 10 are installed on the front side of the drive gear shaft 5, with the mechanical seal 9 located inside the mechanical seal cavity 10; the mechanical seal cavity fixing bolts 11 pass through the mechanical seal cavity 10 and are fixed to the front bracket 2; the front bracket 2 has an oil guide channel 12 that communicates with the front leakage point of the inner circular hole 13 of the drive gear shaft 5; the rear bracket 3 has a return hole 14 on the left side inside and two return channels 15 that respectively connect to the rear leakage points of the drive gear shaft 5 and driven gear shaft 6. The gear segments of the drive gear shaft 5 and driven gear shaft 6 are all helical teeth and are integral with the drive gear shaft 5 and driven gear shaft 6. The friction plates 8 are made of non-metallic materials to provide high wear resistance and fix the axial position of the pump, providing a reaction force for axial force.

[0016] The working principle of this utility model is as follows: Taking the pump body 1 as the center, the direction described in this working principle is observed along the axial direction from one side of the long axis of the drive gear shaft 5. When the gear pump rotates forward, the external power drives the drive gear shaft 5 to rotate, and the driven gear shaft 6 meshes with the gear segment of the drive gear shaft 5 and rotates. The clockwise rotation of the drive gear shaft 5 is considered as forward rotation. The left side of the pump body 1 is the low-pressure zone for oil suction, the right side forms the high-pressure zone for oil discharge, and the upper and lower sides are both medium-pressure oil. Since the gear segments on the drive gear shaft 5 and the driven gear shaft 6 are all helical teeth, their rotation and meshing will generate a backward axial force. The axial force of the drive gear shaft 5 is greater than that of the driven gear shaft 6. The medium-pressure oil inside the pump body 1 is introduced into the rear bracket 3 through the oil guide channel 12 and the round hole 13 from the front end of the drive gear shaft 5 and the driven gear shaft 6, and then through the return channel 15 and the return hole 14 to the low-pressure inlet end. When the gear pump needs to be reversed, simply remove the rear bracket, rotate it 180° and install it, and adjust the directions of the drive gear shaft 5 and the driven gear shaft 6 to the opposite direction to achieve reverse gear pump operation.

[0017] When the sliding bearing 7 is located inside the pump body 1, it is suitable for high viscosity and high precision applications; when the sliding bearing 7 is located inside the front bracket 2 and the rear bracket 3, it is suitable for low viscosity applications.

[0018] While the specific embodiments of this utility model have been described in detail above, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model. Modifications or variations that do not involve creative labor are still within the protection scope of this utility model.

Claims

1. A reversible helical gear pump, characterized in that: The pump body includes a pump body (1), a front bracket (2), a rear bracket (3), a pump body connecting bolt (4), a drive gear shaft (5), a driven gear shaft (6), a sliding bearing (7), a friction plate (8), a mechanical seal (9), a mechanical seal cavity (10), and a mechanical seal cavity fixing bolt (11). The pump body (1) is equipped with a front bracket (2) and a rear bracket (3) on its front and rear sides, and has inlets and outlets on its left and right sides. The pump body connecting bolt (4) passes through the rear bracket (3) and the pump body (1) and is fixed to the front bracket (2). The drive gear shaft (5) is installed on the upper side inside the pump body (1). The driven gear shaft (6) is installed on the lower side inside the pump body (1), and has a circular hole (13) in the center that runs through the entire shaft section. The gear section and the drive gear shaft (5) are connected. Meshing; the left and right shaft sections of the driving gear shaft (5) and driven gear shaft (6) are equipped with sliding bearings (7), and the left and right sides of the gear section are equipped with friction plates (8); the mechanical seal (9) and mechanical seal cavity (10) are installed on the front shaft section of the driving gear shaft (5), and the mechanical seal (9) is located in the mechanical seal cavity (10); the mechanical seal cavity fixing bolt (11) passes through the mechanical seal cavity (10) and is fixed on the front bracket (2); the front bracket (2) has an oil guide channel (12) which communicates with the front leakage point of the inner round hole (13) of the driving gear shaft (5); the rear bracket (3) has a return hole (14) on the left side and two return channels (15) which communicate with the rear leakage points of the driving gear shaft (5) and driven gear shaft (6) respectively.

2. The reversible helical gear pump according to claim 1, characterized in that: Both the driving gear shaft (5) and the driven gear shaft (6) have helical gears.

3. The reversible helical gear pump according to claim 1, characterized in that: The sliding bearing (7) is made of one of the following materials: composite copper bushing, PEEK, or graphite.

4. A reversible helical gear pump according to claim 1, characterized in that: The friction pad (8) is made of one of the following materials: PEEK, ceramic, or silicon carbide.

5. A reversible helical gear pump according to claim 1, characterized in that: The sliding bearing (7) is located inside the pump body (1).

6. A reversible helical gear pump according to claim 1, characterized in that: The sliding bearing (7) is located inside the front bracket (2) and the rear bracket (3).

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