Bidirectional rotation internal gear pump

Abstract

An inner crescent block and an outer crescent block are arranged between a large gear and a small gear from inside to outside, and a round bar and an elastic piece are arranged between the inner crescent block and the outer crescent block. An inclined groove and a groove are formed in the periphery of the inner crescent block, the elastic piece is arranged in the inclined groove, the round rod is arranged in the groove, the round rod is parallel to the transmission shaft, the two sides of the elastic piece abut against the periphery of the inner crescent block and the inner periphery of the outer crescent block, and the small gear, the inner crescent block, the elastic piece, the outer crescent block and the large gear make contact in sequence. According to the bidirectional rotation internal gear pump provided by the utility model, through the innovative design of the crescent sealing ring and the separated crescent block, forward and reverse rotation oil pumping of the pump is realized, and meanwhile, the sealing performance and the control precision of the tooth top clearance are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to fluid machinery technical field, concretely relates to a bidirectional rotation internal meshing gear pump. BACKGROUND

[0002] As a common pump equipment, the internal meshing gear pump is widely used in various industrial occasions. The traditional internal meshing gear pump is usually designed as unidirectional rotation, that is, it can only realize the oil pumping function in one direction. With the continuous development of industrial technology, higher requirements are put forward for the flexibility and adaptability of the oil pumping equipment. In the traditional internal meshing gear pump, the sealing performance and the control of the addendum gap are the key factors affecting the oil pumping efficiency and stability. The traditional sealing mode is prone to leakage, which reduces the oil pumping efficiency and even affects the normal operation of the equipment. At the same time, the too large or too small addendum gap will directly affect the sealing performance and service life of the pump. In order to overcome these shortcomings, there is an urgent need in the market for an internal meshing gear pump which can rotate bidirectionally, has excellent sealing performance and precise control of the addendum gap. SUMMARY

[0003] In view of the above-mentioned deficiencies existing at present, the utility model provides a bidirectional rotation internal meshing gear pump, through the innovative design of crescent-shaped sealing ring and separate crescent block, realizing the forward and reverse rotation of the pump, and improving the sealing performance and the control precision of the addendum gap.

[0004] To achieve the above-mentioned purpose, the embodiment of the utility model adopts the following technical scheme:

[0005] A bidirectional rotation internal meshing gear pump, comprising a pump body, a pump cover and a transmission shaft, the pump body and the pump cover are fixedly connected through fasteners, the transmission shaft is arranged in the pump body, the outer periphery of the transmission shaft is transmissionally connected with a pinion, the outer periphery of the pinion is transmissionally connected with a gear, the transmission shaft drives the rotation of the pinion, the gear and the pinion are provided with an inner crescent block and an outer crescent block from inside to outside, the inner crescent block is provided with a through groove on the side close to the gear, the outer crescent block is embedded in the through groove, a round bar and an elastic sheet are arranged between the inner crescent block and the outer crescent block; the outer periphery of the inner crescent block is provided with an inclined groove and a recess, the elastic sheet is arranged in the inclined groove, the round bar is arranged in the recess, the round bar is parallel to the transmission shaft, the two sides of the elastic sheet abut against the outer periphery of the inner crescent block and the inner periphery of the outer crescent block, the pinion, the inner crescent block, the elastic sheet, the outer crescent block and the gear are in contact in sequence.

[0006] In one embodiment, the inner crescent block and the outer crescent block are both arc-shaped, and the inner crescent block abuts against the pinion inwardly under the reaction force of the elastic sheet.

[0007] In one embodiment, the inner crescent blocks and the outer crescent blocks are positioned by positioning pins, the number of the inner crescent blocks is two, and a main shaft positioning groove is arranged between the two inner crescent blocks; the number of the outer crescent blocks is two, and a secondary shaft positioning groove is arranged between the two outer crescent blocks, and the main shaft positioning groove and the secondary shaft positioning groove form a crescent shaft positioning groove.

[0008] In one embodiment, one end of the positioning pin is connected with the pump body, the other end is provided with a positioning boss matched with the crescent shaft positioning groove, the positioning boss is arranged in the crescent shaft positioning groove, and a tool withdrawal groove is arranged at the connection between the positioning boss and the pin shaft of the positioning pin.

[0009] In one embodiment, a first push plate is arranged between the large gear and the pump body, a second push plate is arranged between the large gear and the pump cover, a first rubber ring is arranged between the first push plate and the pump body, and a second rubber ring is arranged between the second push plate and the pump cover.

[0010] In one embodiment, a first oil inlet hole and a plurality of symmetrical unloading grooves are arranged on the first push plate, and a second oil inlet hole is arranged on one side of the unloading groove.

[0011] In one embodiment, a polygonal structure transmission is adopted between the outer periphery of the transmission shaft and the inner periphery of the pinion gear, and a hexagonal structure transmission is adopted.

[0012] In one embodiment, a gear meshing transmission is adopted between the outer periphery of the pinion gear and the inner periphery of the large gear.

[0013] In one embodiment, a bushing is arranged on the outer side surface of the large gear.

[0014] The two-way rotating internal meshing gear pump has the advantages that the pump can rotate in both directions to pump oil, and the flexibility and adaptability of pumping oil are improved; the internal crescent blocks and the external crescent blocks are designed, a round bar and an elastic sheet are arranged between the internal crescent blocks and the external crescent blocks, an inclined groove and a recess are arranged on the outer periphery of the internal crescent blocks, the inclined groove is directed to the external crescent blocks, the elastic sheet is placed in the inclined groove, the round bar is placed in the recess, the round bar is parallel to the transmission shaft, the two sides of the elastic sheet abut against the outer periphery of the internal crescent blocks and the inner periphery of the external crescent blocks, the internal crescent blocks abut against the pinion gear under the reaction force of the elastic sheet, and the crescent blocks can better adhere to the tooth top to reduce leakage under the action of oil pressure and the elastic sheet; the position relationship between the pinion gear and the internal crescent blocks is jointly positioned by the positioning pins and the elastic positioning pins, and the positioning is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0016] Figure 1 The structure schematic view of the bidirectional rotary internal meshing gear pump is shown in the present application.

[0017] Figure 2 The connection structure plane schematic view of the pinion and the gear is shown in the present application.

[0018] Figure 3 The sectional view of the bidirectional rotary internal meshing gear pump is shown in the present application.

[0019] Figure 4 The structure schematic view of the positioning pin is shown in the present application.

[0020] Figure 5 The structure schematic view of the first push plate is shown in the present application.

[0021] The reference signs are as follows: 1, pump body; 2, pump cover; 3, transmission shaft; 4, pinion; 5, gear; 6, internal crescent block; 7, external crescent block; 8, inclined groove; 9, groove; 10, elastic sheet; 11, round bar; 12, positioning pin; 121, tool withdrawal groove; 13, elastic positioning pin; 14, first push plate; 141, first oil guiding hole; 142, unloading groove; 143, second oil guiding hole; 15, second push plate; 16, first rubber ring; 17, second rubber ring; 18, bushing. DETAILED DESCRIPTION

[0022] In the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0023] In addition, the terms "first", "second", and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0024] In the description of the utility model, it is explained that, unless otherwise explicitly provided and limited, the terms "installation", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, can be detachable connection, or integrated connection: can be mechanical connection, can be electrical connection: can be directly connected, can be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood by specific circumstances.

[0025] The technical scheme in the embodiments of the utility model will be described clearly and completely in the description of the embodiments of the utility model in conjunction with the drawings, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0026] As shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The embodiment provides a bidirectional rotary internal meshing gear pump, which comprises a pump body 1, a pump cover 2 and a transmission shaft 3, the pump body 1 and the pump cover 2 are fixedly connected through fasteners, the fasteners can be bolt assemblies; the transmission shaft 3 is arranged in the pump body 1, the outer periphery of the transmission shaft 3 is transmissionally connected with a pinion 4, the outer periphery of the pinion 4 is transmissionally connected with a gear 5, and the transmission shaft 3 drives the pinion 4 to rotate.

[0027] In actual application, inner and outer crescent blocks 6 and 7 are arranged between the pinion 4 and the gear 5 from inside to outside, the inner crescent block is provided with a through groove on the side close to the gear, and the outer crescent block is embedded on the through groove. In the embodiment, the outer crescent block is a small crescent block, and the inner crescent block is a large crescent block, the outer side surface of the small crescent block is attached to the addendum of the gear, and the inner side surface of the large crescent block is attached to the pinion.

[0028] A round bar 11 and a spring 10 are arranged between the inner crescent block 6 and the outer crescent block 7; the pinion 4, the inner crescent block 6, the spring 10, the outer crescent block 7, and the gear wheel 5 are in contact in sequence. In the embodiment, the inner crescent block 6 and the outer crescent block 7 are both arc-shaped, the outer periphery of the inner crescent block 6 is provided with an inclined groove 8 and a recess 9, the inclined groove 8 is open towards the outer crescent block 7, the spring 10 is arranged in the inclined groove 8, the round bar 11 is arranged in the recess 9, the round bar 11 is parallel to the transmission shaft 3, the two sides of the spring 10 abut against the outer periphery of the inner crescent block 6 and the inner periphery of the outer crescent block 7, and the inner crescent block 6 abuts against the pinion 4 under the reaction force of the spring 10. The spring 10 is used for providing elastic force, so that the crescent blocks can be quickly separated and abut against the tooth tops of the gear wheels, and the tooth top gap is effectively reduced. The round bar 11 is used for blocking the oil channel, preventing the oil from flowing randomly in the pump body 1, and ensuring the smooth flow of the oil.

[0029] In actual application, the inner crescent block 6 and the outer crescent block 7 are positioned by a positioning pin 12 and the pump body 1. In the embodiment, the number of the inner crescent blocks is two, and the two inner crescent blocks are provided with a main shaft positioning groove; the number of the outer crescent blocks is two, and the two outer crescent blocks are provided with a secondary shaft positioning groove. The main shaft positioning groove and the secondary shaft positioning groove form a crescent shaft positioning groove. One end of the positioning pin 12 is connected with the pump body 1, and the other end is provided with a positioning boss which is matched with the crescent shaft positioning groove. The positioning boss is arranged in the crescent shaft positioning groove, and a tool withdrawal groove 121 is arranged at the connection between the positioning boss and the pin shaft of the positioning pin 12. The tool withdrawal groove is an oil passage, which is used for balancing the hub pressure of the gear wheel 5 and the pinion 4. The two side surfaces of the positioning boss are used for positioning the inner crescent block and the outer crescent block, and preventing the axial movement of the inner crescent block and the outer crescent block. The side surfaces can be flat or inclined.

[0030] The inner crescent block 6 is further provided with a positioning pin hole, and an elastic positioning pin 13 is arranged in the positioning pin hole. The elastic positioning pin 13 is matched with a push plate hole arranged on a push plate, so that the crescent block can be pressed and rotated to abut against the tooth top of the pinion 4.

[0031] In actual application, the outer periphery of the driving shaft and the inner periphery of the pinion 4 adopt polygonal structure transmission. In the embodiment, the two adopt hexagonal structure transmission. The outer periphery of the pinion 4 and the inner periphery of the gear wheel 5 adopt gear meshing transmission.

[0032] In actual application, the first push plate 14 is arranged between the large gear 5 and the pump body 1, the second push plate 15 is arranged between the large gear 5 and the pump cover 2, the first push plate 14 is provided with a first oil inlet hole 141 and a plurality of symmetrical unloading grooves, the first oil inlet hole 141 is used for introducing high-pressure oil between the inner crescent block 6 and the outer crescent block 7 in the high-pressure oil channel, so that the crescent block is attached to the gear to reduce the gap leakage. The unloading groove is provided with a second oil inlet hole on one side, which is used for introducing high-pressure oil into the unloading groove to improve the pressure fluctuation and the maximum internal pressure. The first rubber ring 16 is arranged between the first push plate 14 and the pump body 1, the second rubber ring 17 is arranged between the second push plate 15 and the pump cover 2, and the rubber rings are all crescent-shaped rubber rings. The rubber sealing ring not only provides a sealing function, but also pushes the push plate by using the elastic force, so that the oil pump can run under a small gap and reduce leakage. The large gear 5 is provided with a bushing 18 on the outer side, which is used for preventing the large gear 5 from being worn.

[0033] The bidirectional rotary internal meshing gear pump can rotate in both directions to pump oil, and the flexibility and adaptability of pumping oil are improved; the internal crescent block 6 and the outer crescent block 7 are designed, the round bar 11 and the elastic sheet 10 are arranged between the internal crescent block 6 and the outer crescent block 7, the inclined groove 8 and the groove 9 are arranged on the outer periphery of the internal crescent block 6, the opening of the inclined groove 8 points to the outer crescent block 7, the elastic sheet 10 is placed in the inclined groove 8, the round bar 11 is placed in the groove 9, the round bar 11 is parallel to the transmission shaft 3, the two sides of the elastic sheet 10 abut against the outer periphery of the internal crescent block 6 and the inner periphery of the outer crescent block 7, the internal crescent block 6 abuts against the pinion 4 inwardly under the reaction force of the elastic sheet 10, and under the action of oil pressure and the elastic sheet 10, the crescent block can better attach to the tooth top to reduce leakage; the position relationship between the pinion 4 and the internal crescent block 6 is positioned by the positioning pin 12 and the elastic positioning pin 13 together, so that the positioning is more accurate.

[0034] The above embodiment is a preferred implementation scheme of the utility model, in addition to this, the utility model can also be realized in other modes, and any obvious replacement without departing from the technical scheme concept is within the range of the utility model patent.

[0035] In order to make the person skilled in the art more conveniently understand the improvement of the utility model relative to the prior art, some drawings and descriptions of the utility model have been simplified, and some other elements are also omitted in the application file for the sake of clarity, and the person skilled in the art should realize that these omitted elements can also constitute the content of the utility model.

Claims

1. A bidirectional rotary internal gear pump, comprising a pump body (1), a pump cover (2) and a transmission shaft (3), the pump body (1) and the pump cover (2) are fixedly connected by fasteners, the transmission shaft (3) is arranged in the pump body (1), the outer periphery of the transmission shaft (3) is drivingly connected with a pinion (4), the outer periphery of the pinion (4) is drivingly connected with a gear (5), the transmission shaft (3) drives the pinion (4) to rotate, characterized in that, The inner and outer crescent blocks (6, 7) are provided between the large gear (5) and the pinion (4) from inside to outside, the inner crescent block is provided with a through groove on the side close to the large gear, the outer crescent block is embedded in the through groove, the inner and outer crescent blocks (6, 7) are provided with a round bar (11) and a spring sheet (10); the outer periphery of the inner crescent block (6) is provided with an inclined groove (8) and a recess (9), the spring sheet (10) is arranged in the inclined groove (8), the round bar (11) is arranged in the recess (9), the round bar (11) is parallel to the transmission shaft (3), the two sides of the spring sheet (10) abut against the outer periphery of the inner crescent block (6) and the inner periphery of the outer crescent block (7), the pinion (4), the inner crescent block (6), the spring sheet (10), the outer crescent block (7) and the large gear (5) are in contact in sequence; the first push plate (14) is arranged between the large gear (5) and the pump body (1), the second push plate (15) is arranged between the large gear (5) and the pump cover (2), the first rubber ring (16) is arranged between the first push plate (14) and the pump body (1), and the second rubber ring (17) is arranged between the second push plate (15) and the pump cover (2); the first oil guide hole (141) and a plurality of symmetrical unloading grooves (142) are formed in the first push plate (14), and the second oil guide hole (143) is formed in one side of the unloading groove (142).

2. The bidirectional rotary internal gear pump of claim 1, wherein, The inner and outer crescent blocks (6, 7) are arc-shaped, and the inner crescent block (6) abuts against the pinion (4) inwardly under the reaction force of the spring sheet (10).

3. The bi-directional rotary internal gear pump of claim 1, wherein, The inner and outer crescent blocks (6, 7) are positioned by the positioning pin (12) and the pump body (1), the number of the inner crescent blocks is two, and the two inner crescent blocks are provided with a main shaft positioning groove therebetween; the number of the outer crescent blocks is two, and the two outer crescent blocks are provided with a vice shaft positioning groove therebetween, and the main shaft positioning groove and the vice shaft positioning groove form a crescent shaft positioning groove.

4. The bi-directional rotary internal gear pump of claim 3, wherein, One end of the positioning pin (12) is connected with the pump body (1), and the other end is provided with a positioning boss matched with the crescent shaft positioning groove, the positioning boss is arranged in the crescent shaft positioning groove, and a tool withdrawal groove (121) is arranged at the connecting position of the positioning boss and the pin shaft of the positioning pin (12).

5. The bi-directional rotary internal gear pump of claim 1, wherein, The outer periphery of the transmission shaft (3) and the inner periphery of the pinion (4) adopt polygonal structure transmission.

6. The bi-directional rotary internal gear pump of claim 1, wherein, The outer periphery of the pinion (4) and the inner periphery of the large gear (5) adopt gear meshing transmission.

7. The bi-directional rotary internal gear pump of claim 1, wherein, The outer side surface of the large gear (5) is provided with a bushing (18).

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