Arc tooth gear pump

Abstract

The utility model relates to the technical field of gear pumps, in particular to an arc tooth gear pump which comprises a pump body, a rear cover, a front cover, a driving shaft, a driven shaft, a driving gear, a driven gear, a bearing sleeve and a sliding bearing. The driving gear and the driven gear both adopt a composite circular arc tooth shape formed by combining the circular arc, the sine curve and the herringbone teeth, and tooth profile surfaces do not slide relatively in the meshing process of the gears, so that the tooth surfaces are not abraded, and have the advantages of being stable in operation, free of liquid trapping phenomenon, low in noise, long in service life, high in efficiency and the like. And the positions of the driving shaft and the driven shaft are fixed by adopting the bearing sleeve and the sliding bearing, so that the maintenance is more convenient. Under the condition that lubricating oil is added into the sliding bearing, a layer of oil film can be formed on the surface of the sliding bearing to separate the surface of the bearing from equipment, surface abrasion can be reduced to a great extent, the load bearing capacity of the sliding bearing is high, and small working noise can be kept all the time in the working process.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pumps, in particular to an arc gear pump. Background Art

[0002] As a commonly used liquid transmission equipment, gear pumps have been widely used in the fields of petroleum, chemical industry, machinery, etc. However, during the long-term operation of traditional gear pumps, the meshing process of the gears is often accompanied by relative sliding of the tooth surfaces, which not only causes wear of the tooth surfaces, but also makes the gear pump noisy and has a short life during operation, and may even cause liquid entrapment, which seriously affects the working efficiency and stability of the gear pump.

[0003] In addition, the bearing fixing method of traditional gear pumps also has certain limitations. Generally, direct fixing is adopted. When the bearing is worn or fails, it is usually necessary to disassemble the entire pump body for maintenance, which not only increases the difficulty and cost of maintenance, but also affects the operating efficiency of the equipment.

[0004] In terms of unloading, traditional gear pump unloading methods are often complicated and ineffective, and cannot effectively reduce the phenomenon of liquid entrapment, which may cause the gear pump to malfunction or even be damaged during operation. Utility Model Content

[0005] The utility model aims to provide an arc gear pump to solve the problems of the traditional gear pump mentioned in the background technology, such as tooth surface wear, high noise, short life, difficult maintenance and poor unloading effect.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a circular arc gear pump, including a pump body, a rear cover, a front cover, a driving shaft, a driven shaft, a driving gear, a driven gear, a bearing sleeve, and a sliding bearing, wherein the driving gear and the driven gear both adopt a composite circular arc tooth shape combining a circular arc plus a sine curve with a herringbone tooth, the pump body is hollow in structure, and is surrounded by the rear cover and the front cover to form a cavity, the driving shaft and the driven shaft are installed inside the pump body through a supporting component, the supporting component includes a bearing sleeve and a sliding bearing, the driving gear is meshed with the driven gear, and the driving gear and the driven gear are both arranged in the cavity, a relief groove is opened on one side of the rear cover, and the relief groove is arranged near the meshing position of the driving gear and the driven gear.

[0007] The utility model is further configured such that bearing sleeves are arranged inside the pump body on both sides of the driving gear and the driven gear, sliding bearings are arranged inside the bearing sleeves, the outer diameters of the driving shaft and the driven shaft are matched with the inner diameter of the sliding bearings, and the driving shaft and the driven shaft pass through the sliding bearings and are arranged inside the bearing sleeves.

[0008] The utility model is further configured that a safety valve is connected to the top of the pump body by bolts.

[0009] The utility model is further configured that the rear cover and the front cover are connected to the pump body by bolts, one end of the driving shaft passes through the front cover, and a rotating sealing shaft is provided at the connection between the front cover and the driving shaft.

[0010] The utility model is further configured that the driving gear and the driven gear are respectively connected to the driving shaft and the driven shaft through keys.

[0011] The beneficial effects of the utility model are as follows:

[0012] The beneficial effects of the arc gear pump of the utility model are as follows:

[0013] 1. Both the active gear and the passive gear adopt a compound arc tooth shape that combines an arc with a sine curve and a herringbone tooth. There is no relative sliding of the tooth profile during the gear meshing process, so there is no wear on the tooth surface. It has the advantages of stable operation, no fluid entrapment, low noise, long life and high efficiency.

[0014] 2.By using bearing sleeves and sliding bearings to fix the position of the active shaft and the passive shaft, maintenance is more convenient. When lubricating oil is added to the sliding bearing, an oil film will form on the surface to separate the bearing surface from the equipment, which can greatly reduce surface wear. In addition, the sliding bearing has a strong load bearing capacity and can always maintain a low working noise during operation.

[0015] 3. The unloading groove adopts a groove shape to reduce the trapped liquid phenomenon by combining the tooth side clearance to unload. The shape of the unloading groove is simple, so the processing amount is small and the processing technology is simple. When the discharge pressure exceeds the safety pressure, the fault is caused.

[0016] 4. The safety valve can be disassembled at any time, and when the oil discharge pressure is too high or a fault occurs in the oil discharge pipeline, and the oil discharge pipe valve is closed, the safety valve can open automatically, and the transported liquid will flow back to the oil chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only for the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0018] Figure 1 This is a three-dimensional structural diagram of a circular arc gear pump according to an embodiment of the utility model;

[0019] Figure 2This is a transverse cross-sectional view of a circular arc gear pump according to an embodiment of the utility model;

[0020] Figure 3 A longitudinal section view of a circular arc gear pump according to an embodiment of the utility model;

[0021] Figure 4 The exploded view of an arc gear pump according to an embodiment of the utility model.

[0022] The markings in the figure are: 1. Pump body; 2. Safety valve; 3. Rear cover; 4. Passive shaft; 5. Sliding bearing; 6. Bearing sleeve; 7. Driving gear; 8. Passive gear; 9. Unloading groove; 10. Driving shaft; 11. Front cover; 12. Rotating sealing shaft. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other; the following will be combined with the drawings in the embodiments of the present utility model to clearly and completely describe the technical solutions in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0024] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left" and "right" etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limitations of the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or a transmission connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements.

[0025] See also Figure 1 , 2 and Figure 3 , 4A circular arc gear pump comprises a pump body 1, a rear cover 3, a front cover 11, a driving shaft 10, a driven shaft 4, a driving gear 7, a driven gear 8, a bearing sleeve 6, and a sliding bearing 5, wherein the driving gear 7 and the driven gear 8 both adopt a compound circular arc tooth shape combining a circular arc plus a sine curve with a herringbone gear. The pump body 1 is hollow in structure and is surrounded by the rear cover 3 and the front cover 11 to form a cavity. The driving shaft 10 and the driven shaft 4 are installed inside the pump body 1 through a supporting component. The supporting component comprises a bearing sleeve 6 and a sliding bearing 5. The driving gear 7 meshes with the driven gear 8, and the driving gear 7 and the driven gear 8 are both arranged in the cavity. A relief groove 9 is opened on one side of the rear cover 3, and the relief groove 9 is arranged near the meshing position of the driving gear 7 and the driven gear 8.

[0026] By adopting the above technical scheme, both the driving gear 7 and the driven gear 8 adopt a composite circular arc tooth shape combining a circular arc plus a sine curve and a herringbone tooth. During the gear meshing process, there is no relative sliding of the tooth profile surface, so the tooth surface is not worn. When the sliding bearing 5 is added with lubricating oil, an oil film will be formed on the surface to separate the bearing surface from the equipment, which can greatly reduce the surface wear. In addition, the sliding bearing 5 has a strong load-bearing capacity and can always maintain a small working noise during operation. The unloading groove 9 and the tooth side clearance are combined to unload to reduce the liquid entrapment phenomenon, and the unloading groove 9 has a simple shape.

[0027] A bearing sleeve 6 is arranged inside the pump body 1 on both sides of the driving gear 7 and the driven gear 8, and a sliding bearing 5 is arranged inside the bearing sleeve 6. The outer diameters of the driving shaft 10 and the driven shaft 4 are matched with the inner diameter of the sliding bearing 5. The driving shaft 10 and the driven shaft 4 pass through the sliding bearing 5 and are arranged inside the bearing sleeve 6.

[0028] By adopting the above technical solution, when lubricating oil is added to the sliding bearing 5, an oil film will be formed on the surface to separate the bearing surface from the equipment, which can greatly reduce surface wear. In addition, the sliding bearing 5 has a strong load-bearing capacity and can always maintain a low working noise during operation.

[0029] A safety valve 2 is connected to the top of the pump body 1 by bolts, the rear cover 3 and the front cover 11 are connected to the pump body 1 by bolts, one end of the driving shaft 10 passes through the front cover 11, and a rotating sealing shaft 12 is provided at the connection between the front cover 11 and the driving shaft 10, and the driving gear 7 and the driven gear 8 are connected to the driving shaft 10 and the driven shaft 4 by keys respectively.

[0030] By adopting the above technical solution, the safety valve 2 can avoid failures caused by the discharge pressure exceeding the safety pressure. When the discharge pressure is too high or a failure occurs in the discharge pipeline, and the discharge pipe valve is closed, the safety valve 2 automatically opens, and the transported liquid flows back to the oil chamber. It is easy to disassemble and the rotating sealing shaft 12 is used to ensure axial sealing at the input shaft.

[0031] The working principle of the utility model is that the traditional gear pump has tooth surface wear, high noise, short life, difficult maintenance and poor unloading effect. The driving gear 7 and the passive gear 8 of the gear pump both adopt a compound arc tooth shape that combines a circular arc with a sine curve and a herringbone tooth. During the gear meshing process, there is no relative sliding of the tooth profile surface, so there is no wear on the tooth surface. It has the advantages of stable operation, no trapped fluid, low noise, long life, and high efficiency. The bearing sleeve 6 and the sliding bearing 5 are used to fix the position of the driving shaft 10 and the passive shaft 4, making maintenance more convenient. When the sliding bearing 5 is added with lubricating oil, an oil film will form on the surface to separate the bearing surface from the equipment, which can greatly reduce surface wear. The sliding bearing 5 has a strong load-bearing capacity and can always maintain a small working noise during the working process.

[0032] The unloading method of the groove-shaped unloading groove 9 and the tooth side clearance is used to reduce the trapped liquid phenomenon. The unloading groove 9 has a simple shape, so the processing amount is small and the processing technology is simple. A detachable safety valve 2 is set above the pump body 1 to avoid failures caused by the discharge pressure exceeding the safety pressure. When the discharge pressure is too high or a failure occurs in the discharge pipeline, and the discharge pipe valve is closed, the safety valve 2 automatically opens, and the transported liquid flows back to the oil chamber. When the user does not need the safety valve 2, it can be disassembled at any time and a special sealing plate can be installed to ensure the safety of the gear pump. A rotating sealing shaft 12 is set in the front cover 11 to ensure axial sealing at the input shaft.

[0033] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0034] The present invention is intended to cover all such substitutions, modifications and changes that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A circular arc gear pump, characterized in that: It comprises a pump body (1), a rear cover (3), a front cover (11), a driving shaft (10), a driven shaft (4), a driving gear (7), a driven gear (8), a bearing sleeve (6), and a sliding bearing (5); The driving gear (7) and the driven gear (8) both adopt a compound arc tooth shape that combines an arc plus a sine curve with a herringbone tooth. The pump body (1) is hollow in structure and is surrounded by a hollow chamber together with the rear cover (3) and the front cover (11). The driving shaft (10) and the driven shaft (4) are installed inside the pump body (1) via a supporting component. The supporting component comprises a bearing sleeve (6) and a sliding bearing (5); the driving gear (7) is meshed with the driven gear (8); and the driving gear (7) and the driven gear (8) are both arranged in a cavity; a relief groove (9) is provided on one side of the rear cover (3); and the relief groove (9) is arranged close to the meshing position of the driving gear (7) and the driven gear (8).

2. A circular arc gear pump according to claim 1, characterized in that: A bearing sleeve (6) is arranged inside the pump body (1) on both sides of the driving gear (7) and the driven gear (8), a sliding bearing (5) is arranged inside the bearing sleeve (6), the outer diameter of the driving shaft (10) and the driven shaft (4) is matched with the inner diameter of the sliding bearing (5), and the driving shaft (10) and the driven shaft (4) pass through the sliding bearing (5) and are arranged inside the bearing sleeve (6).

3. A circular arc gear pump according to claim 1, characterized in that: The top of the pump body (1) is connected with a safety valve (2) via bolts.

4. A circular arc gear pump according to claim 1, characterized in that: The rear cover (3) and the front cover (11) are connected to the pump body (1) via bolts; one end of the driving shaft (10) passes through the front cover (11); and a rotating sealing shaft (12) is provided at the connection between the front cover (11) and the driving shaft (10).

5. The circular arc gear pump according to claim 1, characterized in that: The driving gear (7) and the driven gear (8) are respectively connected to the driving shaft (10) and the driven shaft (4) via keys.

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