Internal gear pump rear cover capable of stabilizing pressure

Abstract

The utility model discloses an internal gear pump rear cover capable of stabilizing pressure, and relates to the field of gear pumps, the assembly surface of the rear cover is provided with a sealing area corresponding to a working chamber of a pump body, at least part of the area forms a high-pressure contact area, and the area directly acts on high-pressure liquid which periodically changes in the gear pump. A threaded mounting seat is machined in a preset position of the high-pressure contact area, a pressure adjusting assembly with an axial through pressure relief flow channel is assembled in the threaded mounting seat, and the assembly, a flow guide channel arranged in the body and an unloading area form a pressure relief loop. The ladle rear cover is integrated with a pressure regulation and control channel, and dynamic pressure balance under the high-pressure working condition is achieved through the synergistic effect of multiple stages of flow channels.

Description

Technical Field

[0001] This application relates to the field of gear pumps, and in particular to a pressure-stabilizing internal gear pump back cover. Background Technology

[0002] Internal gear pumps, widely used in industrial liquid conveying devices, operate on the principle of meshing and rotating internal and external gears within the pump body. This creates a periodically changing closed cavity volume, enabling liquid intake and discharge. Traditionally, the pump body's rear cover typically employs a flat or simple arc-shaped design, primarily serving sealing and support functions. Under normal operating conditions, this design meets basic pressure requirements. However, as industrial equipment demands higher pressure delivery, the limitations of the rear cover structure become increasingly apparent. Especially during continuous high-pressure operation, it can easily lead to increased pressure fluctuations and non-linear torque increases, directly affecting the pump's operational stability and the fatigue life of critical components.

[0003] In existing technologies, the impact of the rear cover design on pressure characteristics is mainly reflected in two aspects: First, under high-pressure conditions, the pressure field distribution between the gear meshing area and the pump chamber undergoes local deformation due to insufficient rigidity of the rear cover structure, leading to dynamic imbalance of the sealing gap and thus causing periodic pressure pulsations. These pulsations not only transmit to the pipeline system through the pump body, causing vibration and noise, but also exacerbate uneven stress on the gear bearings, significantly shortening their service life. Second, traditional rear covers lack optimized design for the oil return path. During high-speed gear rotation, high-pressure oil easily forms local stagnation in the meshing tooth tip area, generating additional hydraulic resistance torque, causing the drive torque to exhibit a superlinear growth trend with increasing pressure. This phenomenon is particularly pronounced under long-term high-load operation, increasing energy consumption and limiting the pump's upper working pressure limit. The root cause is that existing rear cover structures fail to fully consider the coupling effect of high-pressure fluid dynamics characteristics and mechanical structure deformation, and there is a systematic deficiency in the design of the pressure balance mechanism. Utility Model Content

[0004] The purpose of this application is to overcome at least one deficiency of the prior art and provide a pressure-stabilizing internal gear pump rear cover, which integrates a pressure regulation channel and achieves dynamic pressure balance under high-pressure conditions through the synergistic effect of multi-stage flow channels.

[0005] To achieve the above objectives, this application discloses a pressure-stabilizing internal gear pump rear cover. The mounting surface of the rear cover is provided with a sealing area corresponding to the working chamber of the pump body, wherein at least a portion of the area constitutes a high-pressure contact area. This area directly interacts with the periodically changing high-pressure liquid inside the gear pump. A threaded mounting seat is machined at a predetermined position in the high-pressure contact area, and a pressure regulating component with an axially penetrating pressure relief flow channel is assembled inside the seat. The component, together with the flow guiding channel and unloading area provided inside the body, forms a pressure relief circuit.

[0006] The flushing chamber is connected to the pressure relief hole via a pressure relief channel, wherein the pressure relief hole is located in the non-high pressure contact area of ​​the rear cover.

[0007] Furthermore, the diameter of the pressure relief channel is 0.5 mm.

[0008] Furthermore, the diameter of the flow channel is 3mm.

[0009] Compared with the prior art, the rear cover of this internal gear pump has a sealing area on the assembly surface that corresponds to the working chamber of the pump body. Part of this area forms a high-pressure contact area. A threaded mounting seat is machined in this area, and a pressure regulating component with an axially penetrating pressure relief flow channel is assembled. This forms a pressure release circuit with the internal flow guide channel and unloading area of ​​the pump body, which effectively stabilizes the pressure field distribution of the pump body and reduces pressure pulsation and vibration noise.

[0010] The beneficial effects listed above are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other descriptive sections of this application. Attached Figure Description

[0011] A better understanding of various aspects of this disclosure will be achieved by reading the following detailed description in conjunction with the accompanying drawings. The positions, dimensions, and extents of the structures shown in the drawings, etc., do not always represent actual positions, dimensions, and extents. In the drawings:

[0012] Figure 1 This is a schematic diagram of the structure of one embodiment disclosed in this application.

[0013] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of AA.

[0014] Figure 3 This is a cross-sectional structural schematic diagram of a pressure regulating component in one embodiment of this application.

[0015] The labels in the diagram are as follows: 1-Rear cover, 2-High pressure contact area, 3-Threaded mounting base, 4-Pressure regulating component, 5-Pressure relief channel, 6-Flow guide channel, 7-Buffer chamber, 8-Pressure discharge hole, 9-Pressure discharge channel, 10-Non-high pressure contact area. Detailed Implementation

[0016] The present disclosure will now be described with reference to the accompanying drawings, which illustrate several embodiments of the present disclosure. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure more complete and to fully illustrate the scope of protection of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide further additional embodiments.

[0017] It should be understood that the same reference numerals denote the same elements in all the accompanying drawings. For clarity, the dimensions of certain features may be modified in the drawings.

[0018] It should be understood that the terminology used in this specification is for describing specific embodiments only and is not intended to limit this disclosure. All terms used in this specification (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. For the sake of brevity and / or clarity, techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail; however, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0019] Unless otherwise specified, the singular forms “a,” “the,” and “the” used in this specification include the plural forms. The terms “comprising,” “including,” and “containing” used in this specification indicate the presence of the claimed feature but do not exclude the presence of one or more other features. The term “and / or” used in this specification includes any and all combinations of one or more of the relevant listed items.

[0020] See attached document Figures 1 to 3This embodiment relates to a pressure-stabilizing rear cover 1 for an internal gear pump, primarily used for assembly with the pump body to achieve sealing and pressure regulation of the pump body's internal working chamber. Generally, the rear cover 1 is mainly composed of a cover body. A sealing area corresponding to the pump body's working chamber is provided on the mounting surface of the cover body. At least a portion of this sealing area constitutes a high-pressure contact area 2, which directly interacts with the periodically changing high-pressure liquid inside the gear pump. A threaded mounting seat 3 is machined at a predetermined position in the high-pressure contact area 2, and a pressure regulating component 4 with an axially penetrating pressure relief channel 5 is assembled within it. This pressure regulating component 4 cooperates with the flow guide channel 6 and unloading area 7 provided inside the cover body to form a pressure release circuit. The unloading area 7 is connected to the pressure discharge channel 9 via the pressure relief channel 5, and the pressure discharge hole 8 is arranged in the non-high-pressure contact area 10 of the rear cover 1. This design ensures that during pressure regulation, the liquid can flow along a predetermined path, thereby achieving a stable pressure effect.

[0021] The rear cover 1 body can be made of high-strength cast iron or aluminum alloy to ensure its structural stability and wear resistance under high-pressure environments. The assembly surface is precision-machined to ensure flatness and smoothness, so as to form a good sealing fit with the pump body's working chamber. The sealing area is achieved by machining a groove on the assembly surface that matches the shape of the pump body's working chamber, and installing a sealing ring or gasket within the groove. The sealing ring or gasket can be made of oil-resistant and wear-resistant rubber materials, such as nitrile rubber, to adapt to the working medium and operating conditions of the gear pump and ensure reliable sealing. It should be noted that the material selection, assembly surface structure, structural composition, and processing technology details of the rear cover 1 body are well-known technologies to those skilled in the art and will not be elaborated upon here.

[0022] The high-pressure contact area 2, as a key part of the sealed area, has its area and location designed and determined based on the operating parameters of the gear pump and the distribution of the internal fluid. A threaded mounting seat 3 is machined at a predetermined position in this area. The material of the threaded mounting seat 3 is the same as that of the rear cover 1 body, and its internal thread mates with the external thread of the pressure regulating component 4 to achieve the installation and fixation of the pressure regulating component 4. The pressure regulating component 4 mainly consists of an adjusting bolt and a pressure relief channel 5 set within the bolt. The adjusting bolt can be made of high-strength alloy steel to withstand the force of the high-pressure liquid, and its surface is hardened to improve wear resistance and corrosion resistance. The pressure relief channel 5 is an axially penetrating, slender hole with a diameter of 0.5 mm. This small diameter allows for effective flow control while ensuring liquid flow, achieving precise pressure regulation. In actual machining, the pressure relief channel 5 requires high machining precision, necessitating precision drilling or electrolytic machining processes to ensure that the dimensions and shape of the channel meet design requirements. This is a machining technique well-known to those skilled in the art.

[0023] The rear cover 1 also includes a flow guide channel 6 and an unloading zone 7. The flow guide channel 6 has a diameter of 3mm, and its axis forms a 12.5-degree angle with the axis of the pressure relief channel 5. The function of the flow guide channel 6 is to guide the small amount of high-pressure liquid leaking from the high-pressure contact area 2 to the unloading zone 7. The unloading zone 7 acts as a pressure buffer space, providing initial equalization and stabilization of the liquid pressure. The shape and volume of the unloading zone 7 are optimized according to the pressure regulation requirements to ensure effective buffering under different operating conditions.

[0024] Once the liquid fills the unloading zone 7, it flows through the pressure relief channel 5 to the pressure discharge channel 9, and finally exits through the pressure discharge hole 8 to the outside of the rear cover 1. The pressure discharge hole 8 is located in the non-high-pressure contact area 10 of the rear cover 1, which avoids the discharged liquid from interfering with the high-pressure contact area 2, and also facilitates the smooth discharge of the liquid and prevents pressure buildup.

[0025] The specific processing techniques for the flow channel 6 and the unloading area 7, such as machining or casting, fall within the scope of existing technology and will not be described in detail here.

[0026] During actual operation, when the internal gear pump is running, the high-pressure liquid in the pump body's working chamber periodically acts on the high-pressure contact area 2 of the rear cover 1. At this time, the pressure regulating component 4 begins to function, and the high-pressure liquid enters the unloading area 7 through the guide channel 6. The unloading area 7 buffers and balances the pressure fluctuations of the liquid, keeping the pressure relatively stable. Subsequently, the liquid flows through the pressure relief channel 5 to the pressure discharge channel 9, and finally exits the rear cover 1 through the pressure discharge hole 8, thus forming a complete and effective pressure relief circuit. This ensures the stability of the gear pump's pressure during operation, improves the pump's working efficiency and reliability, reduces the risk of failure and damage caused by pressure fluctuations, and extends the pump's service life.

[0027] Based on the above structure and principle, it can be understood that the gear pump with the rear cover 1 of the internal meshing gear pump with stable pressure, compared with the traditional gear pump without this design, has a significantly reduced output pressure fluctuation during long-term continuous operation, which can provide power to the hydraulic system more stably, ensure the efficient and stable operation of the entire production line, reduce equipment downtime caused by unstable pressure, and improve production efficiency and product quality.

[0028] In summary, the rear cover 1 of the internal gear pump disclosed in this application, through reasonable structural design and close cooperation of its components, achieves effective and stable regulation of the internal pressure of the gear pump, and has good application prospects and practical use effects.

[0029] While exemplary embodiments of this disclosure have been described, those skilled in the art will understand that various changes and modifications can be made to the exemplary embodiments of this disclosure without departing from the spirit and scope thereof. Therefore, all changes and modifications are included within the scope of protection of this disclosure as defined by the claims. This disclosure is defined by the appended claims, and equivalents of those claims are also included.

Claims

1. A rear cover for an internal gear pump with stable pressure, characterized in that, The mounting surface of the rear cover (1) is provided with a sealing area corresponding to the working chamber of the pump body, wherein at least part of the area constitutes a high-pressure contact area (2), which directly interacts with the periodically changing high-pressure liquid inside the gear pump. A threaded mounting seat (3) is machined at a predetermined position in the high-pressure contact area (2), and a pressure regulating component (4) with an axially penetrating pressure relief channel (5) is assembled inside it. The component (4) forms a pressure relief circuit with the guide channel (6) and buffer chamber (7) provided inside the body. The buffer chamber (7) is connected to the pressure discharge channel (9) through the pressure relief channel (5), wherein the pressure discharge hole (8) is arranged in the non-high-pressure contact area (10) of the rear cover (1).

2. The pressure-stabilizing internal gear pump rear cover as described in claim 1, characterized in that, The diameter of the pressure relief channel (5) is 0.5 mm.

3. The pressure-stabilizing internal gear pump rear cover as described in claim 1, characterized in that, The diameter of the flow channel (6) is 3 mm.

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