阅读说明：本技术 一种具有间隙补偿功能双联齿轮泵的密封结构 (Sealing structure of duplex gear pump with clearance compensation function ) 是由 孙蒙蒙 姚广山 王华光 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种具有间隙补偿功能的双联齿轮泵密封结构,包括依次装配的前泵盖、泵体和后泵盖,泵体与后泵盖形成的泵腔中安装有后主动齿轮和后从动齿轮；后主动齿轮的前端面上和后从动齿轮的前端面上设有浮动侧板,该浮动侧板与泵体的端面之间设有橡胶密封圈；橡胶密封圈包括外周的外密封圈体和一体连接在该外密封圈体内侧的内密封圈体；外密封圈体压紧在泵体与后泵盖之间用于实现泵体和后泵盖间的密封,内密封圈体压紧在浮动侧板与泵体的端面之间用于为浮动侧板提供压紧力并将泵的低压区与高压区的隔离。本发明结构简洁、经济实用,并且密封效果好,无需引入压力油即能实现齿轮前端面与泵体间端面间隙的自动补偿。(The invention discloses a double gear pump sealing structure with a clearance compensation function, which comprises a front pump cover, a pump body and a rear pump cover which are assembled in sequence, wherein a rear driving gear and a rear driven gear are arranged in a pump cavity formed by the pump body and the rear pump cover; floating side plates are arranged on the front end surface of the rear driving gear and the front end surface of the rear driven gear, and rubber sealing rings are arranged between the floating side plates and the end surface of the pump body; the rubber sealing ring comprises an outer sealing ring body and an inner sealing ring body, wherein the outer sealing ring body is arranged on the periphery of the rubber sealing ring, and the inner sealing ring body is integrally connected to the inner side of the outer sealing ring body; the outer sealing ring body is tightly pressed between the pump body and the rear pump cover to realize the sealing between the pump body and the rear pump cover, and the inner sealing ring body is tightly pressed between the floating side plate and the end face of the pump body to provide pressing force for the floating side plate and isolate a low-pressure area and a high-pressure area of the pump. The invention has simple structure, economy and practicality and good sealing effect, and can realize the automatic compensation of the end surface clearance between the front end surface of the gear and the pump body without introducing pressure oil.)

1. A duplex gear pump sealing structure with a clearance compensation function comprises a front pump cover (1), a pump body (2) and a rear pump cover (3) which are assembled in sequence, wherein a rear driving gear (4) and a rear driven gear (5) which are meshed with each other are rotatably arranged in a pump cavity (K) formed by the pump body (2) and the rear pump cover (3) in a covering and matching mode; the method is characterized in that: a floating side plate (6) for reducing the end surface clearance between the front end surface of the gear and the pump body (2) is arranged on the front end surface of the rear driving gear (4) and the front end surface of the rear driven gear (5), and a rubber sealing ring (7) which can utilize pressing force generated by elastic deformation force to force the floating side plate (6) to be always attached to the front end surface of the gear to realize automatic compensation of the end surface clearance is arranged between the floating side plate (6) and the end surface of the pump body (2); the rubber sealing ring (7) comprises an outer sealing ring body (71) on the periphery and an inner sealing ring body (72) integrally connected to the inner side of the outer sealing ring body (71); the outer sealing ring body (71) is tightly pressed between the pump body (2) and the rear pump cover (3) and used for realizing sealing between the pump body (2) and the rear pump cover (3), and the inner sealing ring body (72) is tightly pressed between the floating side plate (6) and the end face of the pump body (2) and used for providing pressing force for the floating side plate (6) and isolating a low-pressure area (D) and a high-pressure area (G) of the pump.

2. A tandem gear pump seal structure with clearance compensation function according to claim 1, wherein: a sealing channel for positioning and installing a rubber sealing ring (7) is formed on the end face of the pump body (2), and comprises an outer sealing channel (21) positioned on the outer periphery and an inner sealing channel (22) positioned in the area surrounded by the outer sealing channel (21); the inner sealing channel (22) divides the area in the outer sealing channel (21) to form a low-pressure area (D) and a high-pressure area (G) of the pump; the outer sealing ring body (71) of the rubber sealing ring (7) is positioned and clamped in the outer sealing groove channel (21), and the inner sealing ring body (72) is positioned and clamped in the inner sealing groove channel (22).

3. A double gear pump seal structure with clearance compensation function according to claim 2, wherein: an oil inlet hole (2a), a first shaft hole (2b) for rotatably supporting a rear driving gear (4) and a second shaft hole (2c) for rotatably supporting a rear driven gear (5) are formed in a low-pressure area (D) of the pump on the end surface of the pump body (2); an oil outlet (2d) is formed in a high-pressure area (G) of the pump on the end surface of the pump body (2).

4. A tandem gear pump seal structure having a clearance compensation function according to claim 3, wherein: the rear pump cover (3) is formed with a gear installation cavity (K1) forming a pump cavity body, a third shaft hole (3b) corresponding to the first shaft hole (2b) and a fourth shaft hole (3c) corresponding to the second shaft hole (2c) are formed in the bottom surface of the gear installation cavity (K1), and an oil inlet hole channel (3a) used for connecting the oil inlet hole (2a) with the gear installation cavity (K1) and an oil outlet hole channel (3d) used for connecting the oil outlet (2d) with the gear installation cavity (K1) are formed on the cover plate surface of the rear pump cover (3).

5. A tandem gear pump seal structure having a clearance compensation function according to claim 4, wherein: a driving gear shaft (41) is formed on the rear driving gear (4), the front end of the driving gear shaft (41) is rotatably supported in a first shaft hole (2b) of the pump body (2), and the rear end of the driving gear shaft (41) is rotatably supported in a third shaft hole (3b) of the rear pump cover (3); and a driven gear shaft (51) is formed on the rear driven gear (5), the front end of the driven gear shaft (51) is rotatably supported in a second shaft hole (2c) of the pump body (2), and the rear end of the driven gear shaft (51) is rotatably supported in a fourth shaft hole (3c) of the rear pump cover (3).

6. A tandem gear pump sealing structure with clearance compensation function according to claim 5, wherein: the front end and the rear end of the driving gear shaft (41) and the front end and the rear end of the driven gear shaft (51) are respectively sleeved with a wear-resistant oilless bearing (8).

7. A tandem gear pump sealing structure with clearance compensation function according to claim 6, wherein: the floating side plate (6) is an 8-shaped gasket which is provided with a main shaft hole (6a) and a driven shaft hole (6b), the main shaft hole (6a) is matched with a driving gear shaft (41) of the rear driving gear (4) in a sleeved mode, and the driven shaft hole (6b) is matched with a driven gear shaft (51) of the rear driven gear (5) in a sleeved mode.

8. A tandem gear pump seal structure having a clearance compensation function according to claim 7, wherein: the floating side plate (6) consists of a base steel plate (61) at the bottom and a wear-resistant alloy plate (62) compounded on the base steel plate (61).

9. A tandem gear pump seal structure having a clearance compensation function according to claim 8, wherein: preceding pump cover (1), pump body (2) and back pump cover (3) link to each other through four long bolt stationary phases and become an organic whole, preceding pump cover (1), pump body (2) and back pump cover (3) on all process and have bolt hole (L) that supply long bolt to wear to establish.

10. A tandem gear pump seal structure having a clearance compensation function according to claim 8, wherein: the terminal surface of the pump body (2) on be located the outside bilateral symmetry of fashioned sealed channel and process two first locating pin holes (2e), first locating pin hole (2e) in install locating pin (9), correspondingly, back shroud (3) on process and be used for with locating pin (9) grafting complex second locating pin hole (3 e).

Technical Field

The invention relates to the technical field of hydraulic pumps, in particular to a sealing structure of a duplex gear pump with a clearance compensation function.

Background

Among the parts forming the sealed volume of the gear pump, the end face clearance between the gear end face and the front and rear cover plates is most easily leaked under the action of the pressure difference of pumping and pressing oil. Due to the limitations of machining and assembly processes, the end face clearance cannot be made small at present, and particularly, the clearance is increased after the end face clearance is worn in use, so that leakage is increased. In order to keep a small end face clearance value after abrasion, a clearance compensation method is mostly adopted to realize automatic compensation of the end face clearance at present, but the traditional method needs to introduce pressure oil from a pressure oil cavity so as to enable a floating element to be always attached to the end face of the gear by utilizing the pressure of the pressure oil. This method requires the introduction of pressurized oil and is relatively complex in construction.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art, and provides a sealing structure of a duplex gear pump with a clearance compensation function, which has a simple structure and a good sealing effect and can realize automatic compensation of an end clearance without introducing pressure oil.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a duplex gear pump sealing structure with a clearance compensation function comprises a front pump cover, a pump body and a rear pump cover which are assembled in sequence, wherein a pump cavity formed by the pump body and the rear pump cover in a matched mode is rotatably provided with a rear driving gear and a rear driven gear which are meshed with each other; the front end face of the rear driving gear and the front end face of the rear driven gear are provided with floating side plates for reducing the end face clearance between the front end face of the gear and the pump body, and rubber sealing rings capable of utilizing pressing force generated by elastic deformation force to force the floating side plates to be always attached to the front end face of the gear to realize automatic compensation of the end face clearance are arranged between the floating side plates and the end face of the pump body; the rubber sealing ring comprises an outer sealing ring body and an inner sealing ring body, wherein the outer sealing ring body is arranged on the periphery of the rubber sealing ring, and the inner sealing ring body is integrally connected to the inner side of the outer sealing ring body; the outer sealing ring body is tightly pressed between the pump body and the rear pump cover to realize the sealing between the pump body and the rear pump cover, and the inner sealing ring body is tightly pressed between the floating side plate and the end face of the pump body to provide pressing force for the floating side plate and isolate a low-pressure area and a high-pressure area of the pump.

In order to optimize the technical scheme, the specific measures adopted further comprise:

a sealing channel for positioning and installing a rubber sealing ring is formed on the end face of the pump body, and comprises an outer sealing channel positioned on the periphery and an inner sealing channel positioned in an area surrounded by the outer sealing channel; the inner seal channel divides the area in the outer seal channel into a low pressure area of the pump and a high pressure area of the pump; the outer sealing ring body of the rubber sealing ring is positioned and clamped in the outer sealing channel, and the inner sealing ring body is positioned and clamped in the inner sealing channel. .

An oil inlet hole, a first shaft hole for rotatably supporting the rear driving gear and a second shaft hole for rotatably supporting the rear driven gear are formed in the low-pressure area of the pump on the end surface of the pump body; an oil outlet is formed in the high-pressure area of the pump on the end face of the pump body.

The rear pump cover is internally provided with a gear installation cavity forming a pump cavity main body, a third shaft hole corresponding to the first shaft hole and a fourth shaft hole corresponding to the second shaft hole are formed in the bottom surface in the gear installation cavity, and an oil inlet channel for connecting the oil inlet hole and the gear installation cavity and an oil outlet channel for connecting the oil outlet and the gear installation cavity are formed on the cover plate surface of the rear pump cover.

A driving gear shaft is formed on the rear driving gear, the front end of the driving gear shaft is rotatably supported in a first shaft hole of the pump body, and the rear end of the driving gear shaft is rotatably supported in a third shaft hole of the rear pump cover; and a driven gear shaft is formed on the rear driven gear, the front end of the driven gear shaft is rotatably supported in the second shaft hole of the pump body, and the rear end of the driven gear shaft is rotatably supported in the fourth shaft hole of the rear pump cover.

Wear-resistant oilless bearings are sleeved at the front end and the rear end of the driving gear shaft and the front end and the rear end of the driven gear shaft.

The floating side plate is an 8-shaped gasket processed with a main shaft hole and a driven shaft hole, the main shaft hole is matched with a driving gear shaft of the rear driving gear in a sleeved mode, and the driven shaft hole is matched with a driven gear shaft of the rear driven gear in a sleeved mode.

The floating side plate consists of a base steel plate at the bottom and a wear-resistant alloy plate compounded on the base steel plate.

Foretell front pump cover, pump body and back pump cover link to each other integratively through four stay bolt stationary phases, front pump cover, pump body and back pump cover on all process and have the bolt hole that supplies the stay bolt to wear to establish.

Two first positioning pin holes are symmetrically processed on the outer side of the formed sealing channel on the end face of the pump body in a bilateral mode, positioning pins are installed in the first positioning pin holes, and correspondingly, second positioning pin holes used for being matched with the positioning pins in an inserted mode are processed on the rear cover plate.

Compared with the prior art, the invention is provided with the floating side plates on the front end surface of the rear driving gear and the front end surface of the rear driven gear, and the rubber sealing rings are arranged between the floating side plates and the end surface of the pump body. The invention directly utilizes the elastic deformation force generated by press mounting of the rubber sealing ring to provide pressing force for the floating side plate, the floating side plate can not only reduce the end surface clearance between the front end surface of the gear and the pump body, but also can enable the floating side plate to be always attached to the front end surface of the gear under the action of the elastic deformation force of the rubber sealing ring when the floating side plate is worn, thereby realizing the automatic compensation of the end surface clearance. The invention provides pressing force for the floating side plate by utilizing the deformation force of the rubber sealing ring, thereby not only playing a role of sealing between the pump body and the rear cover plate, but also replacing the introduction of the traditional pressure oil, thereby simplifying the structure of the traditional gear pump.

The invention has simple structure, economy and practicality and good sealing effect, and can realize the automatic compensation of the end surface clearance between the front end surface of the gear and the pump body without introducing pressure oil.

Drawings

FIG. 1 is a schematic view of an assembly structure of a pump body and a rear pump cover according to the present invention;

FIG. 2 is a block diagram of the pump body of the present invention;

FIG. 3 is a cross-sectional structural view of FIG. 2;

FIG. 4 is a schematic view of the rubber seal of FIG. 1;

FIG. 5 is a schematic view of the floating side plate of FIG. 1;

FIG. 6 is a cross-sectional structural view of FIG. 5;

FIG. 7 is a schematic diagram of the construction of the rear pump cap of the present invention;

FIG. 8 is a cross-sectional structural view of FIG. 7;

FIG. 9 is a schematic structural view of the present invention;

fig. 10 is a right side view of fig. 9.

Detailed Description

Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

Fig. 1 to 10 are structural illustrations of the present invention.

Wherein the reference numerals are: the pump comprises a low-pressure area D, a high-pressure area G, a pump cavity K, a gear installation cavity K1, a bolt hole L, a front pump cover 1, a pump body 2, an oil inlet hole 2a, a first shaft hole 2b, a second shaft hole 2c, an oil outlet hole 2D, a first positioning pin hole 2e, an outer sealing channel 21, an inner sealing channel 22, a rear pump cover 3, an oil inlet hole channel 3a, a third shaft hole 3b, a fourth shaft hole 3c, an oil outlet hole channel 3D, a second positioning pin hole 3e, a rear driving gear 4, a driving gear shaft 41, a rear driven gear 5, a driven gear shaft 51, a floating side plate 6, a main shaft hole 6a, a driven shaft hole 6b, a base steel plate 61, a wear-resistant alloy plate 62, a rubber sealing ring 7, an outer sealing ring body 71, an inner sealing ring body.

As shown in fig. 1 and 10, the invention discloses a double gear pump sealing structure with a clearance compensation function, which comprises a front pump cover 1, a pump body 2 and a rear pump cover 3 which are sequentially assembled in a penetrating way through bolts, wherein the pump body 2 and the rear pump cover 3 are matched in a covering way to form a pump cavity K, two gears which are meshed with each other are rotatably arranged in the pump cavity K, the two gears comprise a rear driving gear 4 and a rear driven gear 5, and the pump cavity K is formed by two gears in a hydraulic sealing way to form an oil suction cavity and an oil pressing cavity. The oil suction chamber is formed by the increase of the sealed volume of the cavity at the side where the two gears are disengaged in the pump chamber K, and the oil pressing chamber is formed by the decrease of the sealed volume of the cavity at the side where the two gears are engaged in the pump chamber K. In the prior art, more than 80% of oil leakage of the double gear pump leaks from the end face gap between the front end face of the gear and the pump body, and particularly, the leakage is increased when the end face gap is increased due to the abrasion of the end face after the pump is used for a long time. In order to reduce the end face clearance and ensure that clearance compensation can be obtained after abrasion, floating side plates 6 for reducing the end face clearance between the front end faces of the gears and the pump body 2 are arranged on the front end faces of the two gears, namely the front end face of the rear driving gear 4 and the front end face of the rear driven gear 5, and elastic rubber sealing rings 7 are arranged between the floating side plates 6 and the end face of the pump body 2. The rubber sealing ring 7 forms pressing force acting on the floating side plate 6 by utilizing elastic deformation force generated by compression, and forces the floating side plate 6 to be always attached to the front end face of the gear, so that the gap between the end faces can be reduced, and the automatic compensation of the end face gap can be realized after the floating side plate 6 is worn.

As shown in fig. 4, the rubber seal ring 7 of the present invention is a shaped rubber ring, and is composed of an outer seal ring body 71 at the outer periphery and an inner seal ring body 72 integrally connected to the inner side of the outer seal ring body 71. The outer sealing ring body 71 is tightly pressed between the pump body 2 and the rear pump cover 3 and used for realizing the sealing between the pump body 2 and the rear pump cover 3. The inner seal body 72 is pressed between the floating side plate 6 and the end face of the pump body 2 for providing pressing force to the floating side plate 6 to press the floating side plate 6 against the front end face of the gear, while the inner seal body 72 also serves to isolate the low pressure region D of the pump from the high pressure region G.

In the embodiment, in order to facilitate the positioning and installation of the rubber seal ring 7 and prevent the rubber seal ring 7 from being dislocated, as shown in fig. 2, a sealing channel for positioning and installing the rubber seal ring 7 is formed on the end face of the pump body 2, and the sealing channel is an inner groove machined on the end face of the pump body 2 and comprises an outer sealing channel 21 located on the outer periphery and an inner sealing channel 22 located in the area surrounded by the outer sealing channel 21. The inner seal channel 22 divides the area inside the outer seal channel 21 into a low pressure zone D of the pump and a high pressure zone G of the pump; the outer seal ring body 71 of the rubber seal 7 is positioned to be snap fitted in the outer seal groove 21, and the inner seal ring body 72 is positioned to be snap fitted in the inner seal groove 22.

In the embodiment, with continued reference to fig. 2, an oil inlet hole 2a, a first shaft hole 2b for rotatably supporting the rear driving gear 4 and a second shaft hole 2c for rotatably supporting the rear driven gear 5 are formed on the end surface of the pump body 2 of the present invention in the low pressure region D of the pump; an oil outlet 2d is formed in the high-pressure area G of the pump on the end surface of the pump body 2. The oil inlet hole 2a is used for providing hydraulic oil for an oil suction cavity of the pump, and the oil outlet hole 2d is used for discharging high-pressure oil in the oil suction cavity. Therefore, by separating the high pressure region G of the pump and the low pressure region D of the pump by the inner seal ring body 72, oil leakage between the oil inlet hole 2a and the oil outlet hole 2D can be prevented.

In the embodiment, referring to fig. 7 and 8, the rear pump cover 3 of the present invention is formed with a gear mounting cavity K1 having a front opening, the gear mounting cavity K1 forms a main body portion of the pump cavity K, and the pump body 2 seals the front opening of the gear mounting cavity K1 to form the pump cavity K. A third shaft hole 3b corresponding to the first shaft hole 2b and a fourth shaft hole 3c corresponding to the second shaft hole 2c are formed in the bottom surface in the gear mounting cavity K1. And an oil inlet duct 3a for connecting the oil inlet hole 2a with the gear mounting cavity K1 and an oil outlet duct 3d for connecting the oil outlet hole 2d with the gear mounting cavity K1 are formed on the cover plate surface of the rear pump cover 3.

In the embodiment shown in fig. 1, the rear drive gear 4 of the present invention is formed with a drive gear shaft 41, the front end of the drive gear shaft 41 is rotatably supported in the first shaft hole 2b of the pump body 2, and the rear end of the drive gear shaft 41 is rotatably supported in the third shaft hole 3b of the rear pump cover 3. As can be seen from the figure, the front end of the moving gear shaft 41 is also connected with a coupling sleeve, so that the power drives the rear driving gear 4 to drive the rear driven gear 5 to rotate through the coupling sleeve. The rear driven gear 5 of the present invention is formed with a driven gear shaft 51, the front end of the driven gear shaft 51 is rotatably supported in the second shaft hole 2c of the pump body 2, and the rear end of the driven gear shaft 51 is rotatably supported in the fourth shaft hole 3c of the rear pump cover 3.

In the embodiment, in order to ensure the smoothness of the rotation of the gear and to improve the service life of the gear, the front and rear ends of the driving gear shaft 41 and the front and rear ends of the driven gear shaft 51 are respectively sleeved with the wear-resistant oilless bearings 8.

As shown in fig. 5 and 6, the floating side plate 6 of the present invention is a spacer having an 8-shaped structure, a spindle hole 6a and a driven shaft hole 6b are formed in the floating side plate 6, the spindle hole 6a is fitted with the driving gear shaft 41 of the rear driving gear 4, and the driven shaft hole 6b is fitted with the driven gear shaft 51 of the rear driven gear 5. The floating side plate 6 is sleeved on a gear shaft of the gear through a processed main shaft hole 6a and a processed driven shaft hole 6b, so that the gear shaft can provide guidance for floating of the floating side plate 6 and can prevent the floating side plate 6 from shifting left and right.

In order to further improve the wear resistance of the floating side plate 6 and reduce the manufacturing cost of the floating side plate 6, the floating side plate 6 is made of two materials by compounding, and comprises a base steel plate 61 at the bottom and a wear-resistant alloy plate 62 compounded on the base steel plate 61.

In the embodiment, the front pump cover 1, the pump body 2 and the rear pump cover 3 are fixedly connected into a whole through four long bolts, and bolt holes L for the long bolts to penetrate through are formed in the front pump cover 1, the pump body 2 and the rear pump cover 3.

Two first positioning pin holes 2e are symmetrically processed on the outer side of the formed sealing channel on the end face of the pump body 2, positioning pins 9 are installed in the first positioning pin holes 2e, and correspondingly, second positioning pin holes 3e matched with the positioning pins 9 in an inserting mode are processed on the rear cover plate 3.

Compared with the prior art, the invention provides pressing force for the floating side plate by utilizing the deformation force of the rubber sealing ring, thereby not only playing a role of sealing between the pump body and the rear cover plate, but also replacing the introduction of the traditional pressure oil, thereby simplifying the structure of the traditional gear pump.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by one skilled in the art without departing from the scope of the invention.