A duplex gear pump

Abstract

The application discloses a double gear pump, a front pump assembly comprises a front pump body and a front cover, a rear pump assembly comprises a rear pump body, the front cover is fixedly connected with the front pump body, the front pump body is fixedly connected with the rear pump body, a front pump connecting portion is arranged between the front cover and the front pump body, a rear pump connecting portion is arranged between the front pump body and the rear pump body, and the front pump connecting portion and the rear pump connecting portion are both provided with a first connecting assembly and a second connecting assembly. The front pump body and the front cover are positioned and connected through the front pump connecting portion, the front pump body and the rear pump body are positioned and connected through the rear pump connecting portion, there is no intermediate body structure between the front pump and the rear pump, and the overall structural compactness and connection stability are improved. Since the second connecting assembly is arranged between the front cover and the front pump body and between the front pump body and the rear pump body, the first connecting assembly of the front pump body and the rear pump body can both achieve the effect of inhibiting movement, the positioning precision and transmission precision of the gear pump are improved, and the volumetric efficiency under various rotational speeds and pressures is improved.

Description

Technical Field

[0001] This application belongs to the field of gear pump technology, specifically relating to a double gear pump. Background Technology

[0002] A double gear pump is a gear pump consisting of a front pump and a rear pump connected by a positioning mechanism. It has two inlets and two outlets or one inlet and two outlets for oil flow. It is a rotary gear pump that uses the change and movement of the working volume formed by the pump body and the meshing gears to transport or pressurize liquids. Typically, it consists of two sets of gears on the front and rear pumps, 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. The volume of the space on the meshing side decreases, forcing the liquid into the pipeline. The suction chamber and discharge chamber are separated by the meshing line of the two gears. The pressure at the outlet of the gear pump depends entirely on the resistance generated by the external load at the outlet of the gear pump.

[0003] The front and rear pumps of the gear pump are statically connected by positioning parts during assembly. When the gear pump is working, the gear shaft moves towards the low-pressure area under pressure, and there is a gap at the positioning connection of the pump body. This causes the positioning parts to move towards the low-pressure area as well, which can easily cause uneven grinding of the gear cavity or abnormal operation of the gear pump. Utility Model Content

[0004] This application provides a double gear pump that avoids uneven tooth cavity sweeping or abnormal operation of the gear pump caused by the displacement of the pump body positioning component to the low-pressure area, thereby improving the volumetric efficiency of the gear pump.

[0005] The technical solution adopted in this application is as follows:

[0006] A dual-gear pump includes a front pump assembly and a rear pump assembly. The front pump assembly includes a front pump body and a front cover, and the rear pump assembly includes a rear pump body. The front cover is fixedly connected to the front pump body, and the front pump body is fixedly connected to the rear pump body. A front pump connecting portion is provided between the front cover and the front pump body, and a rear pump connecting portion is provided between the front pump body and the rear pump body. Both the front pump connecting portion and the rear pump connecting portion are provided with a first connecting component and a second connecting component.

[0007] This application also includes the following additional technical features:

[0008] The first connecting component includes a positioning stop and a toothed cavity that mates with the positioning stop; the second connecting component includes a positioning pin and a positioning pin hole that mates with the positioning pin.

[0009] The front cover is provided with the positioning stop, and the front pump body is provided with the toothed cavity; the rear end face of the front pump body is provided with the positioning stop, and the rear pump body is provided with the toothed cavity.

[0010] The positioning stop is aligned with the tooth cavity.

[0011] The positioning pin holes include front positioning pin holes corresponding to the front cover and the front pump body, and rear positioning pin holes corresponding to the rear end face of the front cover and the rear pump body.

[0012] It also includes a support bearing disposed on the front cover, the front cover having a support bearing hole through which the support bearing passes.

[0013] The front pump body is provided with a front pump inlet and a front pump outlet, and the rear pump body is provided with a rear pump inlet and a rear pump outlet.

[0014] The front pump body is provided with a front sealing groove, and the rear pump body is provided with a rear sealing groove. Both the front sealing groove and the rear sealing groove are provided with end face sealing rings.

[0015] The rear pump assembly also includes fasteners that connect the front cover, the front pump body, and the rear pump body.

[0016] The fastener includes a screw disposed on the rear pump body, the screw passing sequentially through the front pump body and the front cover, and both the front pump body and the front cover having threaded holes adapted to the screw.

[0017] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0018] (1) In this application, the front pump body and the front cover are positioned and connected through the front pump connecting part, and the front pump body and the rear pump body are positioned and connected through the rear pump connecting part. The front pump and the rear pump are directly connected without any intermediate structure, which is beneficial to improving the overall structural compactness and connection stability. This application strengthens the positioning stability and reliability of the gear pump by simultaneously setting a first connecting component and a second connecting component between the front cover and the front pump body, and between the front pump body and the rear pump body. While achieving the assembly and positioning of the front and rear pumps, during the operation of the gear pump, when the gear shaft moves towards the low-pressure area under pressure, the second connecting component suppresses the tendency of the first connecting component to move towards the low-pressure area. Since the second connecting component is set between the front cover and the front pump body, and between the front pump body and the rear pump body, the first connecting component of both the front pump body and the rear pump body can achieve the effect of suppressing movement, thereby improving the positioning accuracy and transmission accuracy of the gear pump, which is beneficial to improving the volumetric efficiency of the gear pump under various speeds and pressures.

[0019] (2) The first connecting component of this application includes a positioning stop fitting a gear cavity, and the second connecting component includes a positioning pin fitting a positioning pin hole. When the gear pump is working, the positioning pin and the positioning pin hole have a small clearance fit, resulting in higher positioning accuracy. When the gear shaft moves towards the low-pressure area under pressure during the operation of the gear pump, it is in a dynamic floating state. The positioning pin plays a dynamic positioning role, suppressing the tendency of the positioning stop to move towards the low-pressure area, thereby improving the positioning reliability of the gear pump. The dynamic positioning of the gear pump is achieved during operation. This solution achieves the combined effect of static positioning and dynamic positioning, which greatly improves the positioning accuracy and transmission accuracy of the gear pump, thereby improving the volumetric efficiency of the gear pump under various speeds and pressures, extending the service life of the gear pump, and meeting the reliability requirements of the hydraulic system.

[0020] (3) In this application, the front pump assembly is statically positioned by the positioning stop on the rear end face of the front cover and the toothed cavity on the front pump body; the positioning pin hole on the rear end face of the front cover and the positioning pin hole on the front end of the front pump body are dynamically positioned by positioning pins. Similarly, the rear pump assembly is statically positioned by the positioning stop on the rear end face of the front pump body and the toothed cavity on the rear pump body; the positioning pin hole on the rear end face of the front pump body and the positioning pin hole on the front end of the rear pump body are dynamically positioned by positioning pins. Furthermore, this application adds a support bearing to the front pump assembly, which helps improve transmission smoothness and reduce external interference. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0022] Figure 1 This is a cross-sectional view of a double gear pump in one embodiment of the present invention;

[0023] Figure 2 This is a left view of a double gear pump in one embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the front cover in one embodiment of the present invention;

[0025] Figure 4 This is a left view of the front cover in one embodiment of the present invention;

[0026] Figure 5 This is a front view of the end face sealing ring in one embodiment of the present invention;

[0027] Figure 6 This is a cross-sectional view of the front pump in one embodiment of the present invention;

[0028] Figure 7 This is another cross-sectional view of the front pump body in one embodiment of the present invention;

[0029] Figure 8 This is a right view of the front pump body in one embodiment of the present invention;

[0030] Figure 9 This is a left view of the front pump body in one embodiment of the present invention;

[0031] Figure 10 This is a cross-sectional view of the rear pump body in one embodiment of the present invention;

[0032] Figure 11 This is another cross-sectional view of the rear pump body in one embodiment of the present invention;

[0033] Figure 12 This is a right view of the rear pump body in one embodiment of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Front cover, 2-Support bearing, 3-Front pump body, 31-Front pump inlet, 32-Front pump outlet, 33-Front pump drive gear, 34-Front pump driven gear, 35-Front pump drive gear shaft, 36-Front pump driven gear shaft, 4-Rear pump body, 41-Rear pump inlet, 42-Rear pump outlet, 43-Rear pump drive gear, 44-Rear pump driven gear, 5-Positioning stop, 6-Gear cavity, 7-Positioning pin, 8-Positioning pin hole, 9-Support bearing hole, 10-End face sealing groove, 101-End face sealing ring, 11-Screw. Detailed Implementation

[0036] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0037] Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below. It should be noted that, unless otherwise specified, the embodiments of this application and the features thereof can be combined with each other.

[0038] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0041] This application provides a double gear pump, such as Figures 1 to 12 As shown, it includes a front pump assembly and a rear pump assembly. The front pump assembly includes a front pump body 3 and a front cover 1. The rear pump assembly includes a rear pump body 4. The front cover 1 is fixedly connected to the front pump body 3, and the front pump body 3 is fixedly connected to the rear pump body 4. A front pump connecting part is provided between the front cover 1 and the front pump body 3. A rear pump connecting part is provided between the front pump body 3 and the rear pump body 4. Both the front pump connecting part and the rear pump connecting part are provided with a first connecting component and a second connecting component.

[0042] In this application, the front pump body 3 and the front cover 1 are positioned and connected via a front pump connecting part, and the front pump body 3 and the rear pump body 4 are positioned and connected via a rear pump connecting part. The front and rear pumps are directly connected without any intermediate structure, which improves the overall structural compactness and connection stability. This application enhances the positioning stability and reliability of the gear pump by simultaneously setting a first connecting component and a second connecting component between the front cover 1 and the front pump body 3, and between the front pump body 3 and the rear pump body 4. While achieving the assembly and positioning of the front and rear pumps, during the operation of the gear pump, when the gear shaft moves towards the low-pressure area under pressure, the second connecting component suppresses the tendency of the first connecting component to move towards the low-pressure area. Since the second connecting components are set between the front cover 1 and the front pump body 3, and between the front pump body 3 and the rear pump body 4, the first connecting components of both the front pump body 3 and the rear pump body 4 can be effectively prevented from moving, thus improving the positioning and transmission accuracy of the gear pump, thereby improving the volumetric efficiency of the gear pump under various speeds and pressures.

[0043] In one embodiment, the first connecting component includes a positioning stop 5 and a toothed cavity 6 that mates with the positioning stop 5; the second connecting component includes a positioning pin 7 and a positioning pin hole 8 that mates with the positioning pin 7.

[0044] This application's solution includes a first connecting component comprising a positioning stop 5 engaging with a gear cavity 6, and a second connecting component comprising a positioning pin 7 engaging with a positioning pin hole 8. When the gear pump is operating, the positioning pin 7 and the positioning pin hole 8 have a small clearance fit, resulting in higher positioning accuracy. When the gear shaft moves towards the low-pressure area under pressure during operation, it is in a dynamic floating state. The positioning pin 7 plays a dynamic positioning role, suppressing the tendency of the positioning stop 5 to move towards the low-pressure area, thereby improving the positioning reliability of the gear pump. This solution achieves dynamic positioning of the gear pump during operation. By combining static and dynamic positioning, the positioning and transmission accuracy of the gear pump are greatly improved, thereby increasing the volumetric efficiency of the gear pump under various speeds and pressures, extending the service life of the gear pump, and meeting the reliability requirements of the hydraulic system.

[0045] It is understandable that the positioning stop 5 and toothed cavity 6 between the front cover 1 and the front pump body 3 are engaged, the positioning stop 5 and toothed cavity 6 between the front pump body 3 and the rear pump body 4 are engaged, the positioning pin 7 and positioning pin hole 8 between the front cover 1 and the front pump body 3 are engaged, and the positioning pin 7 and positioning pin hole 8 between the front pump body 3 and the rear pump body 4 are engaged.

[0046] Furthermore, such as Figure 3 , Figure 4 as well as Figures 7 to 10As shown, the front cover 1 is provided with a positioning stop 5, and the front pump body 3 is provided with a toothed cavity 6; the rear end face of the front pump body 3 is provided with a positioning stop 5, and the rear pump body 4 is provided with a toothed cavity 6. The positioning stop 5 of the front cover 1 cooperates with the toothed cavity 6 of the front pump body 3, and the positioning stop 5 provided on the rear end face of the front pump body 3 cooperates with the toothed cavity 6 of the rear pump body 4.

[0047] Preferably, both the positioning stop 5 and the gear cavity 6 are set in the shape of an "8", so that the two meshing gears and gear shafts pass through the hollow inner cavity of the "8" shape for installation and positioning.

[0048] The positioning stop 5 engages with the toothed cavity 6. It is understood that after the positioning stop 5 and the toothed cavity 6 are engaged, the connection can be further reinforced using other fasteners.

[0049] Furthermore, such as Figure 1 , Figure 3 , Figure 4 as well as Figures 7 to 11 As shown, the positioning pin hole 8 includes a front positioning pin hole 8 correspondingly disposed on the front cover 1 and the front pump body 3, and a rear positioning pin hole 8 correspondingly disposed on the rear end face of the front cover 1 and the rear pump body 4. Preferably, the positioning pin 7 can be a cylindrical pin.

[0050] like Figure 1 , Figure 3 As shown, the present application also includes a support bearing 2 disposed on the front cover 1, and the front cover 1 is provided with a support bearing hole 9 through which the support bearing 2 passes.

[0051] In this application, the front pump assembly is statically positioned by the positioning stop 5 on the rear end face of the front cover 1 and the toothed cavity 6 on the front pump body 3. The positioning pin hole 8 on the rear end face of the front cover 1 and the positioning pin hole 8 on the front end of the front pump body 3 are dynamically positioned by positioning pins 7. Similarly, the rear pump assembly is statically positioned by the positioning stop 5 on the rear end face of the front pump body 3 and the toothed cavity 6 on the rear pump body 4. The positioning pin hole 8 on the rear end face of the front pump body 3 and the positioning pin hole 8 on the front end of the rear pump body 4 are dynamically positioned by positioning pins 7. Furthermore, this application adds a support bearing 2 to the front pump assembly, which improves transmission smoothness and reduces external interference.

[0052] In one embodiment, such as Figure 6 , Figure 10 As shown, the front pump body 3 is provided with a front pump inlet 31 and a front pump outlet 32, and the rear pump body 4 is provided with a rear pump inlet 41 and a rear pump outlet 42.

[0053] Preferably, such as Figure 3 , Figure 12 As shown, the front pump body 3 is provided with a front sealing groove, and the rear pump body 4 is provided with a rear sealing groove. Both the front sealing groove and the rear sealing groove are provided with end face sealing rings 101.

[0054] By setting an oil inlet and an oil outlet in the front pump body 3 and the rear pump body 4 respectively, and sealing the front pump body 3 and the rear pump body 4 with the end face sealing ring 101, the double gear pump can achieve the two-inlet and two-outlet function.

[0055] In addition, in this application, the front pump assembly also includes a front pump drive gear shaft 35 and a front pump driven gear shaft 36. The front pump drive gear shaft 35 is fitted with a front pump drive gear 33, and the front pump driven gear shaft 36 is fitted with a front pump driven gear 34. The front pump drive gear 33 and the front pump driven gear 34 mesh. Hydraulic oil enters from the front pump inlet 31, reaches the suction chamber through the inlet channel, and under the meshing and squeezing action of the front pump drive gear 33 and the front pump driven gear 34, the hydraulic oil is squeezed to the outlet channel and then exits from the front pump outlet 32, completing the circulation operation of the front pump.

[0056] Similarly, the rear pump assembly includes a rear pump drive gear 43 and a rear pump driven gear 44. Hydraulic oil enters from the rear pump inlet 41, passes through the inlet channel to the suction chamber, and is squeezed into the outlet channel by the meshing and squeezing action of the rear pump drive gear 43 and the rear pump driven gear 44, and enters the outlet.

[0057] In one embodiment, the rear pump assembly further includes a fastener that simultaneously connects the front cover 1, the front pump body 3, and the rear pump body 4.

[0058] Preferably, such as Figure 2 , Figure 6 , Figure 8 , Figure 10 As shown, the fasteners include screws 11 located on the rear pump body 4. The screws 11 pass sequentially through the front pump body 3 and the front cover 1. Both the front pump body 3 and the front cover 1 have threaded holes adapted to the screws 11. The double gear pump assembly connects and secures the front pump assembly and the rear pump assembly using high-strength screws 11, enhancing the overall structural stability. The positioning stop 5 mates with the gear cavity 6, and together with the positioning pin 7 and screws 11, fixes the front cover 1, the front pump body 3, and the rear pump body 4, improving the compactness and reliability of the double gear pump.

[0059] The dual gear pump of this application, with its front and rear pump assemblies operating simultaneously, can provide a larger hydraulic flow rate. In both assemblies, as the driving gear rotates, the teeth gradually disengage, forming an inter-tooth volume that gradually increases, creating a low-pressure zone that draws liquid in through the inlet. As the gears continue to rotate, the teeth re-engage, the inter-tooth volume gradually decreases, creating a high-pressure zone that compresses the liquid and discharges it through the outlet. Throughout this process, the rotation and engagement of the gears are continuous, allowing the gear pump to continuously draw in and discharge liquid. However, when the gear shaft approaches the low-pressure zone under pressure, it is in a dynamic floating state. The gear, influenced by pressure, is pushed towards the low-pressure oil chamber, causing friction between the tooth tips and the pump body. The radial clearance between the positioning stop 5 and the tooth cavity 6 also causes the positioning stop 5 to approach the low-pressure zone, resulting in unreliable positioning and negatively impacting the positioning and transmission accuracy of the gear pump. This solution utilizes the second connecting component to compensate for radial clearance. By using the minute clearance between the positioning pin 7 and the positioning pin hole 8, the positioning accuracy is improved, and the positioning stop 5 is prevented from shifting towards the low-pressure area.

[0060] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0061] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0062] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A double gear pump characterized by, The device includes a front pump assembly and a rear pump assembly. The front pump assembly includes a front pump body (3) and a front cover (1). The rear pump assembly includes a rear pump body (4). The front cover (1) is fixedly connected to the front pump body (3). The front pump body (3) is fixedly connected to the rear pump body (4). A front pump connection part is provided between the front cover (1) and the front pump body (3). A rear pump connection part is provided between the front pump body (3) and the rear pump body (4). Both the front pump connection part and the rear pump connection part are provided with a first connection component and a second connection component.

2. The double gear pump of claim 1, wherein The first connecting component includes a positioning stop (5) and a toothed cavity (6) that mates with the positioning stop (5); the second connecting component includes a positioning pin (7) and a positioning pin hole (8) that mates with the positioning pin (7).

3. The double gear pump of claim 2, wherein, The front cover (1) is provided with the positioning stop (5), and the front pump body (3) is provided with the toothed cavity (6); the rear end face of the front pump body (3) is provided with the positioning stop (5), and the rear pump body (4) is provided with the toothed cavity (6).

4. The double gerotor pump of claim 3, wherein, The positioning stop (5) is aligned with the tooth cavity (6).

5. The double gerotor pump of claim 2, wherein, The positioning pin hole (8) includes a front positioning pin hole (8) corresponding to the front cover (1) and the front pump body (3) and a rear positioning pin hole (8) corresponding to the rear end face of the front cover (1) and the rear pump body (4).

6. The twin gear pump of claim 1, wherein, It also includes a support bearing (2) disposed on the front cover (1), the front cover (1) having a support bearing hole (9) through which the support bearing (2) passes.

7. The twin gear pump of claim 1, wherein, The front pump body (3) is provided with a front pump inlet (31) and a front pump outlet (32), and the rear pump body (4) is provided with a rear pump inlet (41) and a rear pump outlet (42).

8. The double gear pump of claim 7, wherein, The front pump body (3) is provided with a front sealing groove, and the rear pump body (4) is provided with a rear sealing groove. Both the front sealing groove and the rear sealing groove are provided with end face sealing rings (101).

9. The twin gear pump of claim 1, wherein, The rear pump assembly also includes fasteners, which simultaneously connect the front cover (1), the front pump body (3), and the rear pump body (4).

10. The double gear pump of claim 9, wherein, The fastener includes a screw (11) disposed on the rear pump body (4), the screw (11) passing through the front pump body (3) and the front cover (1) in sequence, and both the front pump body (3) and the front cover (1) are provided with threaded holes adapted to the screw (11).

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