High-pressure gear pump

Abstract

A high-pressure gear pump comprises a pump shell and a pump cover, and further comprises a first shaft tooth and a second shaft tooth which are arranged in the pump shell, parallel to the axis of the pump shell and meshed with each other, and the two shaft teeth are sequentially sleeved with a floating side plate, a sealing ring and a baffle from any end of a key groove to the end of the shaft tooth adjacent to any end of the key groove where the two shaft teeth are located; a supporting transmission ring coaxially sleeves the periphery of the shaft teeth from any baffle to the adjacent ends of the first shaft tooth and the second shaft tooth, a gap for communicating the two ends of the supporting transmission ring is formed in the side wall of the supporting transmission ring, and at least one first groove for communicating the two ends of the supporting transmission ring is formed in the inner wall of the supporting transmission ring. Through reasonable arrangement of component structures, the whole cavity is filled with high-pressure liquid, and the piezoresistance of the high-pressure liquid is greatly reduced, so that the power loss of the high-pressure gear pump is reduced, the end face leakage is reduced, the volume efficiency of the high-pressure gear pump is increased, the working performance of the pump is greatly improved, the internal lubrication of the high-pressure gear pump is enhanced, and the noise is reduced; and the working reliability of the high-pressure gear pump is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of gear pumps, and in particular relates to a high-pressure gear pump. Background Art

[0002] As a large-displacement, high-pressure hydraulic power pump, high-pressure gear pump is widely used in hydraulic control systems and other fields due to its compact structure, light weight, and good self-priming performance. However, in actual use, high-pressure gear pumps often have problems such as low volumetric efficiency, easy leakage, and excessive deformation of the casing causing large wear and noise on the gears and pump casing, resulting in unsatisfactory actual matching effect of high-pressure gear pumps.

[0003] In order to solve the above-mentioned problems that are prone to occur when matching high-pressure gear pumps, the current solutions are mainly through adjusting the gear clearance, improving the lubrication effect, and installing a sound insulation cover. However, there is a lack of structural improvements to the high-pressure gear pump itself, resulting in poor improvement effects and overly complex components. Summary of the Invention

[0004] In response to the above problems, the purpose of this utility model is to provide a high-pressure gear pump, which solves the problems of high wear and noise in high-pressure gear pumps through reasonable arrangement of component structures, as well as the problems of poor improvement effects of existing methods, cumbersome components and large size.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the present invention include:

[0006] A high-pressure gear pump includes a pump casing and a pump cover, and also includes a first shaft tooth and a second shaft tooth arranged in the pump casing and parallel to the axis of the pump casing and meshing with each other. Space is left between the first shaft tooth and the second shaft tooth and the pump casing and the pump cover. One end of the first shaft tooth extends to the outside of the pump cover and is sealed with the pump cover. It is characterized in that the two shaft teeth are sequentially sleeved with floating side plates, sealing rings and baffles from either end of the keyway to the shaft tooth ends adjacent to either end of the keyway; any baffle is coaxially sleeved with a support transmission ring on the outer periphery of the shaft teeth adjacent to the first shaft tooth and the second shaft tooth, the side wall of the support transmission ring is provided with a gap connecting its two ends, and the inner wall of the support transmission ring is provided with at least one first groove connecting its two ends.

[0007] Preferably, the contact surface between the floating side plate and the baffle is provided with a W-shaped second groove, and the distance between any point on the second groove and the nearest first shaft tooth or second shaft tooth is equidistant, and oil passages are also provided on both sides of the second groove; the sealing ring matches the inner side wall structure of the oil passage; the contact surface between the baffle and the floating side plate is provided with a step matching the second groove structure.

[0008] Preferably, a second through groove parallel to the axis of the pump casing is provided at the contact surface between the pump casing and any supporting transmission ring near the inlet of the pump casing; a load relief groove and a straight groove are provided at the contact surface between the floating side plate and the baffle near the outlet of the pump casing, the load relief groove is connected to the straight groove, and the second through groove and the oil passage are connected through the space between the shaft teeth and the pump casing.

[0009] Preferably, the pump cover is provided with a pressure regulating through hole connecting one end of the supporting transmission ring at one end of the first shaft tooth with the unloading groove.

[0010] Preferably, the inner wall of the support transmission ring is provided with two first grooves parallel to the axis thereof, and the gap is parallel to the axis of the support transmission ring.

[0011] Preferably, annular grooves are provided on both sides of the contact surface between the floating side plate and the two shaft tooth keyways.

[0012] Preferably, the height of the step is greater than the depth of the second groove.

[0013] Preferably, a plurality of limiting protrusions are provided on the inner side of the sealing ring.

[0014] Preferably, a first through groove is provided in the second shaft tooth to connect the two ends thereof.

[0015] Preferably, the first through groove is coaxial with the second shaft tooth.

[0016] Compared with the prior art, the advantages of the present invention are:

[0017] (1) The high-pressure gear pump of the present invention, through the reasonable arrangement of the component structure, makes the entire cavity filled with high-pressure liquid, and the pressure resistance of the high-pressure liquid is greatly reduced, thereby reducing the power loss of the high-pressure gear pump, reducing end face leakage, increasing the volumetric efficiency of the high-pressure gear pump, greatly improving the working performance of the pump, enhancing the internal lubrication of the high-pressure gear pump, reducing noise, and ensuring the working reliability of the high-pressure gear pump.

[0018] (2) The high-pressure gear pump of the present invention, through the reasonable arrangement of the component structure, the cooperation of the step and the second groove is conducive to the installation and positioning of the baffle, while increasing the volume of high-pressure oil in the oil passage, so that the floating side plates on both sides of the pump press the gears, reducing end face leakage and increasing the volumetric efficiency of the high-pressure gear pump.

[0019] (3) The high-pressure gear pump of the present invention has a reasonable arrangement of the component structure, and the annular groove is conducive to releasing the higher pressure near the outlet of the high-pressure gear pump, increasing the pressure gradient on the surface of the cavity near the outlet, and at the same time reducing the area of the high-pressure liquid acting on the surface of the cavity, reducing the deformation of the high-pressure gear pump, avoiding the friction between the two shaft teeth and the pump casing, reducing the working noise, and improving the working reliability of the high-pressure gear pump.

[0020] (4) The high-pressure gear pump of the present invention, through the reasonable arrangement of the component structure, cooperates with the second through groove, the unloading groove and the straight groove to balance the pressure difference between high and low pressure liquids in the high-pressure gear pump, stabilize the inlet pressure, and reduce the risk of liquid leakage in the high-pressure gear pump. At the same time, the unloading groove avoids the problem of oil entrapment in the gear meshing area inside the high-pressure gear pump, thereby improving the reliability of the pump.

[0021] (5) The high-pressure gear pump of the present invention, through the reasonable arrangement of the component structure and the design of the pressure regulating through hole, allows the high-pressure liquid to flow to the oil seal and the front of the floating side plate respectively, thereby reducing the force of the high-pressure liquid on the oil seal and reducing the risk of liquid leakage in the high-pressure gear pump. At the same time, the high-pressure liquid flowing through the hole to the front of the floating side plate further pushes the floating side plate and the gear end face to be pressed together, that is, to increase the pressing force of the floating side plate on the gear end face, reduce the end face leakage of the high-pressure gear pump, and improve the volumetric efficiency of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 The figure is an exploded view of a high-pressure gear pump;

[0024] Figure 2 for Figure 1 Front view of the middle support transmission ring;

[0025] Figure 3 for Figure 1 Front view of the middle baffle;

[0026] Figure 4 for Figure 1 Front view of the middle floating side panel;

[0027] Figure 5 for Figure 1 Top view of the mid-floating side panel;

[0028] Figure 6 for Figure 1 Front view of the middle pump casing;

[0029] Figure 7 for Figure 1 Front view of the middle pump cover;

[0030] Figure 8 for Figure 1 Front view of the first sealing ring;

[0031] Figure 9 This is a transverse cross-sectional front view of a high-pressure gear pump;

[0032] Figure 10 for Figure 9 Middle AA section view;

[0033] Figure 11 for Figure 10 A partial enlarged view of the

[0034] Figure 12 for Figure 9 Middle BB section view.

[0035] The symbols in the figure represent:

[0036] 1. First shaft gear, 2. Second shaft gear, 3. Floating side plate, 4. First sealing ring, 5. Baffle, 6. Support transmission ring, 7. Pump casing, 8. Pump cover, 9. Oil seal, 10. Elastic circlip for hole, 11. Second sealing ring, 12. Bolts;

[0037] 2-1 first through groove; 3-1 oil passage, 3-2 second groove, 3-3 unloading groove, 3-4 straight groove, 3-5 annular groove; 4-1 limiting protrusion; 5-1 step; 6-1 first groove, 6-2 gap; 7-1 outlet, 7-2 inlet, 7-3 second through groove; 8-1 pressure regulating hole. DETAILED DESCRIPTION

[0038] The utility model is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the utility model.

[0039] It should be noted that the directional terms mentioned in this article, such as "inner cavity", "inner periphery", "inner wall" and "outside", are consistent with the specific directions on the paper in the drawings of the specification or the corresponding directions of the space shown in the drawings; all components and equipment in this utility model, unless otherwise specified, are all components and equipment known in the prior art.

[0040] Example

[0041] The present embodiment discloses a high-pressure gear pump, comprising a pump casing 7 and a pump cover 8, and further comprising a first shaft tooth 1 and a second shaft tooth 2 arranged in the pump casing 7 and parallel to the axis thereof and meshing with each other. Space is left between the first shaft tooth 1 and the second shaft tooth 2 and the pump casing 7 and the pump cover 8. One end of the first shaft tooth 1 extends outside the pump cover 8 and is sealed with the pump cover 8. The two shaft teeth are sequentially sleeved with a floating side plate 3, a sealing ring 4 and a baffle 5 from either end of the keyway to the shaft tooth end adjacent to either end of the keyway; a support transmission ring 6 is coaxially sleeved from any baffle 5 to the outer periphery of the shaft tooth at the adjacent end of the first shaft tooth 1 and the second shaft tooth 2. The side wall of the support transmission ring 6 is provided with a gap 6-2 connecting its two ends, and the inner wall is provided with at least one first groove 6-1 connecting its two ends.

[0042] Its function is as follows: the first shaft tooth 1 is the driving gear, the second shaft tooth 2 is the driven gear, and the first shaft tooth 1 is linked to the second shaft tooth 2; the baffle 5 forms an assembly with the floating side plate 3 and the sealing ring 4, which limits the shaft teeth on the one hand, and forms a closed cavity inside the assembly on the other hand, and introduces high-pressure oil through the through hole of the floating side plate 3, thereby adjusting the gap between the floating side plate 3 and the end face of the shaft teeth; the support transmission ring 6 is used to limit and support the first shaft tooth 1 and the second shaft tooth 2 in the pump casing 7, and its gap 6-2 and the first groove 6-1 cooperate to increase the liquid flow through the support transmission ring 6, reduce the internal pressure resistance of the cavity, and enhance the dynamic pressure lubrication of the support transmission ring 6; the oil circuit inside the pump cavity is continuous, which reduces the internal pressure resistance and enhances the dynamic pressure lubrication of the sliding bearing, effectively reducing the working noise of the pump.

[0043] The first shaft tooth 1 and the second shaft tooth 2 disclosed in this embodiment are both shaft gears, and their tooth shape and size parameters are consistent. An oil seal 9 and a hole elastic retaining ring 10 are coaxially arranged at the connection between one end of the first shaft tooth 1 and the pump cover 8; the support transmission ring 6 disclosed in this embodiment is preferably a sliding bearing, and an equal-width gap 6-1 is arranged along its axial direction, and the inner wall of the support transmission ring 6 is provided with two first grooves 6-1 parallel to its axis.

[0044] The first shaft tooth 1 disclosed in this embodiment is a solid shaft, and the second shaft tooth 2 is provided with a first through groove 2-1 connecting its two ends (that is, the second shaft tooth 2 is a hollow shaft). When the high-pressure gear pump is working, the high-pressure liquid in the pump chamber can enter the hollow shaft along the working gap through the gap of the sliding bearing 6. The oil path inside the high-pressure gear pump cavity is continuous, which greatly reduces the pressure resistance inside the cavity, reduces the loss of the high-pressure gear pump, and effectively improves the heat dissipation performance of the high-pressure gear pump.

[0045] The pump housing 7 and the pump cover 8 disclosed in this embodiment are fixed circumferentially by a plurality of bolts 12, and the connection is sealed by a second sealing ring 11, so that the inner cavity of the pump body is relatively sealed.

[0046] Specifically, the contact surface between the floating side plate 3 and the baffle plate 5 is provided with a W-shaped second groove 3-2. Any point on the second groove 3-2 is equidistant from the nearest first shaft tooth 1 or second shaft tooth 2. Oil passages 3-1 are also provided on both sides of the second groove 3-2. The sealing ring 4 matches the inner wall structure of the oil passage 3-1. The contact surface between the baffle plate 5 and the floating side plate 3 is provided with a step 5-1 that matches the structure of the second groove 3-2.

[0047] Its function is as follows: the step 5-1 and the second groove 3-2 are inserted and assembled, so that the floating side plate 3, the sealing ring 4 and the baffle 5 are assembled together, and a closed oil circuit is formed with the high-pressure gear pump cavity through the oil passage 3-1, which is conducive to the installation and positioning of the baffle 5. At the same time, the high-pressure oil volume in the oil passage 3-1 is increased, so that the floating side plates 3 on both sides of the pump press the gears, reduce end face leakage, and increase the volumetric efficiency of the high-pressure gear pump.

[0048] Specifically, annular grooves 3-5 are provided on both sides of the contact surface between the floating side plate 3 and the two shaft tooth keyways;

[0049] Its function is to release the higher pressure near the outlet 7-1 of the high-pressure gear pump, increase the pressure gradient on the cavity surface near the outlet 7-1, and at the same time reduce the area of high-pressure liquid acting on the cavity surface, reduce the deformation of the high-pressure gear pump, avoid mutual friction between the two shaft teeth and the pump casing, reduce working noise, and improve the working reliability of the high-pressure gear pump.

[0050] The sealing ring 4 disclosed in this embodiment is provided with multiple limiting protrusions 4-1 on the inner side, which not only realizes the sealing function, but also achieves a radial fixing effect, reduces the difficulty of assembling various components, increases the volume of high-pressure liquid in the oil passage 3-1, further ensures that the floating side plate is pressed against the gear end face, and reduces the end face leakage of the high-pressure gear pump.

[0051] The height of the step 5 - 1 disclosed in this embodiment is greater than the depth of the second groove 3 - 2 , which facilitates the installation and positioning of the baffle 5 and increases the axial effective area of the high-pressure oil in the oil passage 3 - 1 of the floating side plate 3 .

[0052] Specifically, the contact surface of the pump casing 7 with any supporting transmission ring 6 is provided with a second through groove 7-3 parallel to its axis near the inlet 7-2 of the pump casing 7; the contact surface of the floating side plate 3 with the baffle 5 is provided with a relief groove 3-3 and a straight groove 3-4 near the outlet 7-1 of the pump casing 7, the relief groove 3-3 is connected with the straight groove 3-4, and the second through groove 7-3 and the oil passage 3-1 are connected through the space between the shaft teeth and the pump casing. The high-pressure liquid in the high-pressure gear pump passes through the central through hole of the second shaft teeth 2, along the second through groove 7-3 of the pump casing 7 and the first groove 6-1 of the supporting transmission ring 6, and can be pressed into the inlet 7-2 of the high-pressure gear pump to balance the pressure difference between high and low pressure liquids in the high-pressure gear pump, stabilize the pressure of the inlet 7-2, and reduce the risk of liquid leakage of the high-pressure gear pump. At the same time, the relief groove 3-3 avoids the problem of oil trapped in the gear meshing area inside the high-pressure gear pump, thereby improving the reliability of the pump.

[0053] Specifically, the pump cover 8 is provided with a pressure regulating through hole 8-1 that connects one end of the supporting transmission ring 6 at one end of the first shaft gear 1 with the unloading groove 3-3;

[0054] Its function is to make the high-pressure liquid flow to the oil seal 9 and the front of the floating side plate 3 respectively, reduce the force of the high-pressure liquid on the oil seal 9, and reduce the risk of liquid leakage in the high-pressure gear pump. At the same time, the high-pressure liquid flowing through the hole to the front of the floating side plate further pushes the floating side plate and the gear end face to be pressed tightly, that is, to increase the pressing force of the floating side plate 3 on the gear end face, reduce the end face leakage of the high-pressure gear pump, and improve the volumetric efficiency of the pump.

[0055] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0057] In addition, the various different implementation methods disclosed in this solution can also be arbitrarily combined, as long as they do not violate the ideas of this disclosure, they should also be regarded as the contents of the invention of this disclosure.

Claims

1. A high-pressure gear pump, comprising a pump housing (7) and a pump cover (8), further comprising a first shaft tooth (1) and a second shaft tooth (2) arranged in the pump housing (7) and parallel to the axis thereof and meshing with each other, wherein a space is left between the first shaft tooth (1) and the second shaft tooth (2) and the pump housing (7) and the pump cover (8), and one end of the first shaft tooth (1) extends outside the pump cover (8) and is sealed with the pump cover (8), characterized in that: The two shaft teeth are sequentially sleeved with floating side plates (3), sealing rings (4) and baffles (5) from either end of the keyway to the end of the shaft teeth adjacent to either end of the keyway; A supporting transmission ring (6) is coaxially sleeved on the outer periphery of the shaft teeth of each baffle (5) and the adjacent ends of the first shaft tooth (1) and the second shaft tooth (2). The side wall of the supporting transmission ring (6) is provided with a gap (6-2) for connecting the two ends thereof, and the inner wall of the supporting transmission ring (6) is provided with at least one first groove (6-1) for connecting the two ends thereof.

2. The high-pressure gear pump according to claim 1, wherein A W-shaped second groove (3-2) is provided on the contact surface between the floating side plate (3) and the baffle (5); any point on the second groove (3-2) is equidistant from the nearest first shaft tooth (1) or second shaft tooth (2); and oil passages (3-1) are provided on both sides of the second groove (3-2); The sealing ring (4) matches the inner wall structure of the oil passage (3-1); The contact surface between the baffle (5) and the floating side plate (3) is provided with a step (5-1) that matches the structure of the second groove (3-2).

3. The high-pressure gear pump according to claim 2, characterized in that The contact surface of the pump housing (7) and any supporting transmission ring (6) is provided with a second through groove (7-3) parallel to the axis thereof, near the inlet (7-2) of the pump housing (7); A load relief groove (3-3) and a straight groove (3-4) are provided on the contact surface between the floating side plate (3) and the baffle (5) near the outlet (7-1) of the pump housing (7); the load relief groove (3-3) is connected to the straight groove (3-4), and the second through groove (7-3) and the oil passage (3-1) are connected to the space between the shaft teeth and the pump housing.

4. The high-pressure gear pump according to claim 3, wherein The pump cover (8) is provided with a pressure regulating through hole (8-1) for connecting one end of the supporting transmission ring (6) at one end of the first shaft tooth (1) with the unloading groove (3-3).

5. The high-pressure gear pump according to any one of claims 1 to 4, characterized in that: The inner wall of the support transmission ring (6) is provided with two first grooves (6-1) parallel to the axis thereof, and the gap (6-2) is parallel to the axis of the support transmission ring (6).

6. The high-pressure gear pump according to any one of claims 2 to 4, characterized in that: Annular grooves (3-5) are respectively provided on both sides of the contact surface between the floating side plate (3) and the two shaft tooth keyways.

7. The high-pressure gear pump according to any one of claims 2 to 4, characterized in that: The height of the step (5-1) is greater than the depth of the second groove (3-2).

8. The high-pressure gear pump according to any one of claims 2 to 4, characterized in that: A plurality of position-limiting protrusions (4-1) are provided on the inner side of the sealing ring (4).

9. The high-pressure gear pump according to any one of claims 2 to 4, characterized in that: A first through groove (2-1) is provided in the second shaft tooth (2) for connecting the two ends thereof.

10. The high-pressure gear pump according to claim 9, wherein The first through groove (2-1) is coaxial with the second shaft tooth (2).

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