Internal gear pump with simple structure

Abstract

The invention provides an internal gear pump with a simple structure, which comprises a pump body, a pump cover, an inner gear ring and an outer gear internally meshed with the inner gear ring, the inner gear ring and the outer gear are rotatably mounted in a rotor cavity of the pump body, and a crescent cavity is formed between the inner gear ring and the outer gear. An oil distribution disc and a rubber ring are installed between the inner gear ring and the bottom wall of the rotor cavity of the pump body, a round protruding part capable of being embedded into the rotor cavity is arranged on the inner side face of the pump cover, and the end face of the protruding part is in contact fit with the end face of the inner gear ring and the end face of the outer gear. Due to the fact that the oil distribution disc and the rubber ring are installed between the inner gear ring and the bottom wall of the rotor cavity of the pump body, the valve plate is pushed to be tightly attached to the inner gear ring and the outer gear through elasticity of the rubber ring and oil pressure, end face compensation is conducted on one side, the other side is directly in contact with the inner gear ring and the outer gear through the protruding portion of the pump cover, and therefore it can be guaranteed that the oil pump operates under a small gap. And compared with an existing gear pump, the gear pump is simpler and more compact in structure, so that the compensation stability is improved.

Description

Technical Field

[0001] This invention relates to the field of gear pump technology, and specifically to an internal meshing gear pump with a simple structure. Background Technology

[0002] Internal gear pumps, as a common type of pump, are widely used in various industrial applications. Traditional internal gear pumps are typically designed for unidirectional rotation, meaning they can only pump oil in one direction. However, with the continuous development of industrial technology, higher demands are placed on the flexibility and adaptability of pumping equipment. In traditional internal gear pumps, controlling the axial clearance and tooth tip clearance of the gears is a key factor affecting pumping efficiency and stability. Clearances that are too large or too small will directly affect the pump's sealing performance and service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an internal gear pump with a simple structure that can provide stable and reliable axial clearance compensation.

[0004] The technical solution of the present invention is: a simple internal gear pump, including a pump body, a pump cover, an internal gear ring, and an external gear meshing with the internal gear ring. The internal gear ring and the external gear are rotatably installed in the rotor cavity of the pump body. A crescent-shaped cavity is formed between the internal gear ring and the external gear. A filler is provided in the crescent-shaped cavity. An oil distribution plate and a rubber ring are installed between the internal gear ring and the bottom wall of the rotor cavity of the pump body. The inner side of the pump cover is provided with a circular protrusion that can be embedded in the rotor cavity. The end face of the protrusion is flat, and the end face of the protrusion contacts and engages with the end face of one end of the internal gear ring and the external gear.

[0005] In the above technical solution, an oil distribution plate and a rubber ring are installed between the internal gear ring and the bottom wall of the rotor cavity of the pump body. The elasticity of the rubber ring and the oil pressure push the distribution plate to fit tightly against the internal gear ring and the external gear, and end face compensation is performed on one side. On the other side, the pump cover protrusion directly contacts the internal gear ring and the external gear. This ensures that the oil pump operates with a small clearance and has a simpler and more compact structure than existing gear pumps, thereby improving the stability of compensation.

[0006] In one embodiment, the end face of the protrusion is provided with two concave oil grooves.

[0007] In one embodiment, the filler includes an outer crescent block and an inner crescent block stacked together. The outer crescent block has an outer arc surface that can engage with multiple tooth tips of the internal gear ring, and the inner crescent block has an inner arc surface that can engage with multiple tooth tips of the external gear. A rubber rod and a spring are provided between the outer and inner crescent blocks. The protrusion of the pump cover has two inclined oil holes corresponding to the position between the outer and inner crescent blocks, and one end of each inclined oil hole is connected to an oil groove. This allows oil to be drawn from the oil groove to the space between the outer and inner crescent blocks, opening them up and enhancing the radial compensation effect.

[0008] In one embodiment, each of the two oil sumps has a pre-pressurization shallow groove extending into the tooth grooves of the internal gear ring and the external gear at one end.

[0009] In one embodiment, both the internal gear ring and the external gear have involute convex tooth surfaces. This improves meshing transmission and reduces noise.

[0010] In one embodiment, a sealing ring is fitted around the outer periphery of the protrusion.

[0011] In one embodiment, the pump cover is made of a wear-resistant material. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the exploded structure of the gear pump in an embodiment of the present invention;

[0013] Figure 2 This is a schematic cross-sectional view of the gear pump in an embodiment of the present invention;

[0014] Figure 3 This is a schematic diagram of the pump cover structure in an embodiment of the present invention;

[0015] Figure 4 This is a schematic diagram of the internal gear ring and external gear combination structure in an embodiment of the present invention;

[0016] The attached figures are labeled as follows:

[0017] 10. Pump body; 20. Pump cover; 21. Protrusion; 22. Oil groove; 23. Inclined oil hole; 24. Pre-pressurization shallow groove; 30. Internal gear ring; 40. External gear; 50. Oil distribution plate; 60. Rubber ring; 70. Outer crescent block; 80. Inner crescent block; 90. Sealing ring. Detailed Implementation

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0019] It should be noted in advance that, in this invention, unless otherwise explicitly 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 connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] like Figures 1 to 4 As shown, a simple internal gear pump includes a pump body 10, a pump cover 20, an internal gear ring 30, and an external gear 40 internally meshing with the internal gear ring 30. The internal gear ring 30 and the external gear 40 are rotatably mounted in the rotor cavity of the pump body 10, forming a crescent-shaped cavity between the internal gear ring 30 and the external gear 40. A filler is provided in the crescent-shaped cavity. An oil distribution plate 50 and a rubber ring are installed between the internal gear ring 30 and the bottom wall of the rotor cavity of the pump body 10. The pump cover 20 adopts... Made of wear-resistant material, the inner side of the pump cover 20 is provided with a circular protrusion 21 that can be embedded in the rotor cavity. The outer periphery of the protrusion 21 is fitted with a sealing ring 90. The end face of the protrusion 21 is flat. The end face of the protrusion 21 contacts and engages with the end face of one end of the internal gear ring 30 and the external gear 40. The end face of the protrusion 21 is provided with two concave oil grooves 22. One end of each of the two oil grooves 22 is provided with a pre-pressurization shallow groove 24 extending into the tooth groove of the internal gear ring 30 and the external gear 40.

[0021] Because an oil distribution plate 50 and a rubber ring are installed between the internal gear ring 30 and the bottom wall of the rotor cavity of the pump body 10, the elasticity of the rubber ring and the oil pressure push the distribution plate to fit tightly against the internal gear ring 30 and the external gear 40, and end face compensation is performed on one side. On the other side, the protrusion 21 of the pump cover 20 directly contacts the internal gear ring 30 and the external gear 40. This ensures that the oil pump can operate with a small clearance, and the structure is simpler and more compact than the existing gear pump, thereby improving the stability of compensation.

[0022] like Figure 1 As shown, the filler includes an outer crescent block 70 and an inner crescent block 80 stacked together. The outer crescent block 70 has an outer arc surface that can engage with multiple tooth tips of the internal gear ring 30, and the inner crescent block 80 has an inner arc surface that can engage with multiple tooth tips of the external gear 40. A rubber rod and a spring are provided between the outer crescent block 70 and the inner crescent block 80. The protrusion 21 of the pump cover 20 has two inclined oil holes 23 corresponding to the position between the outer crescent block 70 and the inner crescent block 80. One end of each inclined oil hole 23 is connected to an oil groove 22. In this way, oil can be drawn from the oil groove 22 to the space between the outer crescent block 70 and the inner crescent block 80 to open them up, thereby enhancing the radial compensation effect.

[0023] like Figure 4As shown, the teeth of both the internal gear ring 30 and the external gear 40 are involute convex teeth. This improves meshing transmission and reduces noise.

[0024] The above embodiments are preferred implementations of the present invention. In addition, the present invention can be implemented in other ways. Any obvious substitutions without departing from the concept of the present technical solution are within the protection scope of the present invention.

[0025] To facilitate understanding by those skilled in the art of the improvements of this invention over the prior art, some of the accompanying drawings and descriptions have been simplified, and for clarity, some other elements have been omitted from this application. Those skilled in the art should realize that these omitted elements may also constitute the content of this invention.

Claims

1. A simple internal gear pump, comprising a pump body (10), a pump cover (20), an internal gear ring (30), and an external gear (40) internally meshing with the internal gear ring (30). The internal gear ring (30) and the external gear (40) are rotatably mounted in the rotor cavity of the pump body (10). The number of teeth of the external gear (40) is less than the number of teeth of the internal gear ring (30), forming a crescent-shaped cavity between the internal gear ring (30) and the external gear (40). A filler is provided in the crescent-shaped cavity. An oil distribution plate (50) and a rubber ring are installed between the internal gear ring (30) and the bottom wall of the rotor cavity of the pump body (10). The pump is characterized in that: The inner side of the pump cover (20) is provided with a circular protrusion (21) that can be embedded in the rotor cavity. The end face of the protrusion (21) is a plane, and the end face of the protrusion (21) is in contact with the end face of one end of the internal gear ring (30) and the external gear (40).

2. The internal gear pump with a simple structure according to claim 1, characterized in that: The end face of the protrusion (21) is provided with two concave oil grooves (22).

3. The internal gear pump with a simple structure according to claim 2, characterized in that: The filler includes an outer crescent block (70) and an inner crescent block (80) stacked together. The outer crescent block (70) has an outer arc surface that can fit with multiple tooth tips of the inner gear ring (30), and the inner crescent block (80) has an inner arc surface that can fit with multiple tooth tips of the outer gear (40). A rubber rod and a spring are provided between the outer crescent block (70) and the inner crescent block (80). The protrusion (21) of the pump cover (20) is provided with two inclined oil holes (23) at the position between the outer crescent block (70) and the inner crescent block (80). One end of each inclined oil hole (23) is connected to an oil groove (22).

4. The internal gear pump with a simple structure according to claim 2, characterized in that: Each of the two oil troughs (22) has a pre-pressurization shallow groove (24) extending into the tooth grooves of the inner gear ring (30) and the outer gear (40) at one end.

5. The internal gear pump with a simple structure according to claim 1 or 2, characterized in that: The teeth of both the internal gear ring (30) and the external gear (40) are involute convex tooth surfaces.

6. The internal gear pump with a simple structure according to claim 1 or 2, characterized in that: A sealing ring (90) is fitted around the outer periphery of the protrusion (21).

7. The internal gear pump with a simple structure according to claim 1 or 2, characterized in that: The pump cover (20) is made of wear-resistant material.

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