Internal gear pump with high-pressure sealing support

Abstract

The internal gear pump comprises a pump body, a pump cover, a pressing plate, a high-pressure sealing ring, an inner boss and a gear assembly, the pump cover is fixedly arranged on the pump body and matched with the pump body, a pump cavity is formed between the pump body and the pump cover, the gear assembly is arranged in the pump cavity, and the inner boss is arranged in the pump cavity. The pump cover is provided with two oil inlet and outlet channels matched with the gear assembly, a pressing plate is arranged between the gear assembly and the pump cover, oil through holes matched with the oil inlet and outlet channels are formed in the two sides of the pressing plate respectively, and the oil inlet and outlet channels are communicated with the corresponding oil through holes in a sealed mode through high-pressure sealing rings. A sealing groove matched with the high-pressure sealing ring is formed in the end face of the pump cover, and an annular inner boss is arranged on the inner wall of the high-pressure sealing ring in a sealed mode. The inner boss is arranged on the high-pressure sealing ring, hydraulic oil acts on the inner boss to enable the high-pressure sealing ring and the pressing plate to be fully sealed, the high-pressure sealing ring is arranged in the sealing groove and also fully sealed with the pump cover, and therefore leakage of the hydraulic oil is effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear pump field, especially in a kind of high-pressure sealing support's internal meshing gear pump. BACKGROUND

[0002] In internal meshing gear pump, friction exists between gear and pump cover, therefore, pressure plate is arranged between gear and pump cover, small gap exists between pressure plate and pump cover, when gear pressurizes hydraulic oil, high-pressure part of hydraulic oil enters low-pressure part through small gap, after setting sealing ring between pump cover and pressure plate, better sealing work still cannot be realized. UTILITY MODEL CONTENTS

[0003] The utility model aims at overcoming the insufficient of prior art, provide a kind of high-pressure sealing support's internal meshing gear pump.

[0004] The utility model aims at overcoming the insufficient of prior art, provide a kind of high-pressure sealing support's internal meshing gear pump.

[0005] A kind of high-pressure sealing support's internal meshing gear pump, including pump body, pump cover, pressure plate, high-pressure sealing ring, inner boss and gear assembly, the pump cover is fixedly arranged on the pump body and is cooperated with the pump body, pump cavity is arranged between the pump body and the pump cover, the gear assembly is arranged in the pump cavity, two oil inlet and outlet passages that are cooperated with the gear assembly are provided on the pump cover, the pressure plate is arranged between the gear assembly and the pump cover, two sides of the pressure plate are respectively provided with the oil passage that is cooperated with the oil inlet and outlet passage, the oil inlet and outlet passage and corresponding the oil passage are sealed and communicated by the high-pressure sealing ring, the end surface of the pump cover is provided with the sealing groove that is cooperated with the high-pressure sealing ring, annular inner boss is sealingly arranged on the inner wall of the high-pressure sealing ring.

[0006] Further, the gear assembly includes transmission shaft, driving gear, driven gear and crescent plate, the driven gear is rotatably arranged in the pump cavity and is cooperated with the pump cavity, the driving gear is coaxially fixedly arranged on the transmission shaft, the transmission shaft is sealingly rotatably arranged on the pump body, the outer gear of the driving gear is engaged with the inner gear of the driven gear, the crescent plate is arranged between the driving gear and the driven gear, the two ends of the crescent plate are respectively formed first hydraulic chamber and second hydraulic chamber, the first hydraulic chamber and the second hydraulic chamber are cooperated with two oil passages respectively.

[0007] Further, wear-resistant ring is arranged between the outer wall of the driven gear and the inner wall of the pump cavity.

[0008] Further, wear-resistant bottom plate is arranged between the bottom of the pump cavity and the gear assembly.

[0009] Further, the crescent plate is arranged on the pump cover through a connecting pin.

[0010] Further, the end of the high-pressure sealing ring and the end of the inner boss are flush and both are in sealing fit with the pressing plate.

[0011] Further, the two high-pressure sealing rings on the pump cover are arranged symmetrically.

[0012] Further, the high-pressure sealing ring is integrally formed with the inner boss.

[0013] The utility model has the advantages of:

[0014] 1) In the present technology, the inner boss is arranged on the high-pressure sealing ring, and the hydraulic oil acts on the inner boss to make the high-pressure sealing ring and the pressing plate fully realize sealing, and the high-pressure sealing ring arranged in the sealing groove also fully realizes sealing between the high-pressure sealing ring and the pump cover, thereby effectively preventing the hydraulic oil from leaking.

[0015] 2) In the present technology, the wear-resistant ring is arranged to prevent the driven gear from contacting the side wall of the pump cavity, and the wear-resistant bottom plate is arranged to prevent the driving gear and the driven gear from contacting the bottom of the pump cavity, thereby preventing the driving gear and the driven gear from damaging the side wall and the bottom of the pump cavity during operation. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective connection structure diagram of the gear pump.

[0017] Figure 2 It is an internal connection structure diagram of the gear pump.

[0018] Figure 3 It is a cooperation structure diagram between the pressing plate and the high-pressure sealing ring.

[0019] Figure 4 It is a perspective connection structure diagram of the gear assembly.

[0020] Figure 5 It is a cooperation structure diagram between the high-pressure sealing ring and the inner boss.

[0021] In the figure, 1-pump body, 2-pump cover, 3-pressing plate, 4-high-pressure sealing ring, 5-inner boss, 6-inlet and outlet oil passage, 7-oil passage hole, 8-sealing groove, 9-transmission shaft, 10-driving gear, 11-driven gear, 12-crescent plate, 13-first hydraulic cavity, 14-second hydraulic cavity, 15-wear-resistant ring, 16-wear-resistant bottom plate, 17-connecting pin. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described clearly and completely below in connection with the embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative effort are within the scope of the present application.

[0023] Referring to Figure 1-Figure 5 The present application provides a technical solution:

[0024] The internal gear pump with high-pressure sealing support comprises a pump body 1, a pump cover 2, a pressing plate 3, a high-pressure sealing ring 4, an inner boss 5 and a gear assembly. The pump cover 2 is fixedly arranged on the pump body 1 and cooperates with the pump body 1. A pump cavity is arranged between the pump body 1 and the pump cover 2. The gear assembly is arranged in the pump cavity. Two oil inlet and outlet channels 6 are arranged on the pump cover 2 and cooperate with the gear assembly. The pressing plate 3 is arranged between the gear assembly and the pump cover 2. Two oil through holes 7 are arranged on the two sides of the pressing plate 3 and cooperate with the oil inlet and outlet channels 6. The oil inlet and outlet channels 6 are in sealing communication with the corresponding oil through holes 7 through the high-pressure sealing ring 4. A sealing groove 8 is arranged on the end face of the pump cover 2 and cooperates with the high-pressure sealing ring 4. The inner wall of the high-pressure sealing ring 4 is sealingly provided with the annular inner boss 5. The end of the high-pressure sealing ring 4 and the end of the inner boss 5 are flush and sealingly cooperate with the pressing plate 3. The high-pressure sealing ring 4 and the inner boss 5 are integrally formed. The two high-pressure sealing rings 4 on the pump cover 2 are symmetrically arranged. The pump cavity is arranged only in the pump body 1. The gear assembly is used to pressurize the hydraulic oil in the pump cavity and discharge the high-pressure hydraulic oil. One of the two oil inlet and outlet channels 6 is an oil inlet channel, and the other is an oil discharge channel. When the driving gear 10 rotates forward, the oil inlet channel is used for oil inlet, and the oil discharge channel is used for oil discharge. When the driving gear 10 rotates reversely, the oil discharge channel is used for oil inlet, and the oil inlet channel is used for oil discharge. The high-pressure sealing ring 4 and the inner boss 5 form a complete sealing ring. The sealing ring not only sealingly cooperates with the pump cover 2, but also sealingly cooperates with the pressing plate 3. In this way, the hydraulic oil in the high-pressure channel is prevented from entering the low-pressure channel. The high-pressure channel is used for oil discharge, and the low-pressure channel is used for oil inlet.

[0025] In some embodiments, the gear assembly comprises a transmission shaft 9, a driving gear 10, a driven gear 11 and a crescent plate 12, the driven gear 11 is rotatably arranged in the pump cavity and cooperates with the pump cavity, the driving gear 10 is coaxially fixedly arranged on the transmission shaft 9, the transmission shaft 9 is sealingly rotatably arranged on the pump body 1, the outer teeth of the driving gear 10 are engaged with the inner teeth of the driven gear 11, the crescent plate 12 is arranged between the driving gear 10 and the driven gear 11, two ends of the crescent plate 12 are respectively formed with a first hydraulic cavity 13 and a second hydraulic cavity 14, and the first hydraulic cavity 13 and the second hydraulic cavity 14 are matched with two oil holes 7 respectively. The crescent plate 12 is arranged on the pump cover 2 through a connecting pin 17. Wherein, the transmission shaft 9 is sealingly matched with the pump body 1, one end of the transmission shaft 9 is connected with the driving gear 10, the other end of the transmission shaft 9 is connected with the driving motor in the prior art, the driving gear 10 and the driven gear 11 do not rotate in the rotating process, therefore the crescent plate 12 is connected with the pump cover 2 through the connecting pin 17, and a through hole matched with the connecting pin 17 is arranged on the pressing plate 3. One end of the driving gear 10, the driven gear 11 and the crescent plate 12 is in contact with the pressing plate 3, and the other end of the driving gear 10, the driven gear 11 and the crescent plate 12 is in contact with the wear-resistant bottom plate 16. The first hydraulic cavity 13 is communicated with one oil inlet and outlet 6, the second hydraulic cavity 14 is communicated with another oil inlet and outlet 6, and the first hydraulic cavity 13 and the second hydraulic cavity 14 are arranged in the interior of the driven gear 11.

[0026] In some embodiments, a wear-resistant ring 15 is arranged between the outer wall of the driven gear 11 and the inner wall of the pump cavity. A wear-resistant bottom plate 16 is arranged between the bottom of the pump cavity and the gear assembly. Wherein, the wear-resistant ring 15 is arranged to prevent the driven gear 11 from contacting the side wall of the pump cavity, and the wear-resistant bottom plate 16 is arranged to prevent the driving gear 10 and the driven gear 11 from contacting the bottom of the pump cavity, so as to prevent the driving gear 10 and the driven gear 11 from damaging the side wall and the bottom of the pump cavity during operation. The wear-resistant ring 15 and the wear-resistant bottom plate 16 are convenient to replace after being damaged. The wear-resistant bottom plate 16 and the pressing plate 3 do not rotate in the pump cavity.

[0027] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower", "bottom", "one end", "top", "middle", "the other end", "coaxial", "one side", "inner", "front", "central", "both ends" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model.

[0028] In the utility model, unless another definite provision and limitation, the term "arrange", "install", "connect", "fix", "hinge" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two element internal communication or two element's mutual action relation, unless another definite limitation, for the ordinary skill in the art, can understand the above-mentioned term in the utility model specific meaning according to specific circumstances.

[0029] The above only is the preferred embodiment of the utility model, should understand the utility model is not limited to the form disclosed in this paper, should not be regarded as the exclusion of other embodiments, and can be used in various other combinations, modifications and environment, and can be within the scope of the concept described herein, by the above teaching or related art technical or knowledge is changed.And the personnel of the change and variation of the field do not deviate from the spirit and scope of the utility model, then all should be within the scope of protection of the claims attached to the utility model.

Claims

1. An internal gear pump with a high-pressure seal support, characterized in that: The invention comprises a pump body (1), a pump cover (2), a pressure plate (3), a high-pressure sealing ring (4), an inner boss (5) and a gear assembly, wherein the pump cover (2) is fixedly arranged on the pump body (1) and cooperates with the pump body (1), a pump cavity is arranged between the pump body (1) and the pump cover (2), the gear assembly is arranged in the pump cavity, two inlet and outlet oil passages (6) cooperating with the gear assembly are arranged on the pump cover (2), the pressure plate (3) is arranged between the gear assembly and the pump cover (2), oil holes (7) cooperating with the inlet and outlet oil passages (6) are respectively arranged on both sides of the pressure plate (3), the inlet and outlet oil passages (6) and the corresponding oil holes (7) are sealed and connected through the high-pressure sealing ring (4), a sealing groove (8) cooperating with the high-pressure sealing ring (4) is arranged on the end face of the pump cover (2), and the inner wall of the high-pressure sealing ring (4) is sealed with the annular inner boss (5).

2. An internal gear pump with a high-pressure seal support according to claim 1, characterized in that: The gear assembly comprises a transmission shaft (9), a driving gear (10), a driven gear (11) and a crescent plate (12); the driven gear (11) is rotatably arranged in the pump chamber and cooperates with the pump chamber; the driving gear (10) is coaxially fixedly arranged on the transmission shaft (9); the transmission shaft (9) is sealed and rotatably arranged on the pump body (1); the external teeth of the driving gear (10) are meshed with the internal teeth of the driven gear (11); the crescent plate (12) is arranged between the driving gear (10) and the driven gear (11); the two end sides of the crescent plate (12) respectively form a first hydraulic chamber (13) and a second hydraulic chamber (14); the first hydraulic chamber (13) and the second hydraulic chamber (14) respectively cooperate with the two oil holes (7).

3. An internal gear pump with a high-pressure seal support according to claim 2, characterized in that: A wear-resistant ring (15) is provided between the outer wall of the driven gear (11) and the inner wall of the pump chamber.

4. An internal gear pump with a high-pressure seal support according to claim 2 or 3, characterized in that: A wear-resistant bottom plate (16) is provided between the bottom of the pump chamber and the gear assembly.

5. An internal gear pump with a high-pressure seal support according to claim 2 or 3, characterized in that: The crescent plate (12) is arranged on the pump cover (2) via a connecting pin (17).

6. An internal gear pump with a high-pressure seal support according to any one of claims 1 to 3, characterized in that: The end of the high-pressure sealing ring (4) and the end of the inner boss (5) are flush and both are in sealing cooperation with the pressure plate (3).

7. An internal gear pump with a high-pressure seal support according to any one of claims 1 to 3, characterized in that: The two high-pressure sealing rings (4) on the pump cover (2) are symmetrically arranged.

8. An internal gear pump with a high-pressure seal support according to any one of claims 1 to 3, characterized in that: The high-pressure sealing ring (4) and the inner boss (5) are integrally formed.

Images