CN203743068U - Water pump used for engine - Google Patents

Abstract

The utility model discloses a water pump for an engine, which comprises an impeller, a shaft seal and a bearing arranged sequentially along the axial direction of a transmission shaft; the vortex chamber of the water pump is formed by a pump body and a cover; The end protrudes from the cover body, and the liquid inlet side of the impeller placed in the vortex chamber faces the pump body; wherein, the liquid inlet channel communicating with the vortex chamber is opened on the pump body. The water pump provided by the utility model can be installed on the side of the engine, and the liquid inlet part is relatively located at the rear, and does not occupy the size of the front end of the engine. Therefore, the problem of the overall length of the engine after the assembly is completed can be completely avoided. It improves its applicability, has the characteristics of reliable operation and compact structure, and meets the mainstream trend requirements of existing structural design.

Description

engine water pump

technical field

The utility model relates to the technical field of engine cooling, in particular to an engine water pump.

Background technique

The function of the engine cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature. Among them, the cooling system using air as the cooling medium is called the air cooling system; the cooling system using the cooling liquid as the cooling medium is called the water cooling system.

As we all know, when the engine is working, the temperature of the gas in the cylinder is very high. If it is not cooled in time, the temperature of the engine parts will be too high, especially the parts that are directly in contact with the high-temperature gas will affect the normal fit clearance due to thermal expansion, resulting in the movement of moving parts. blocked or even stuck. In addition, high temperature will also cause the mechanical strength of engine parts to decrease, and the lubricating oil will lose its effect. For the water cooling system, the water pump used in the system is used to pressurize the coolant to ensure its circulation in the cooling system. Obviously, the water pump is one of the key components to ensure the reliability of the cooling system.

In the prior art, a water pump is a pumping device that utilizes the interaction between blades and liquid to transport liquid. Please refer to Fig. 1, which shows a schematic structural diagram of a typical water pump.

The water pump includes a casing 3 used to form a vortex chamber with the engine body, etc., and an impeller 4 is installed in the casing 3. The impeller 4 is fixedly connected with the transmission shaft of the shaft coupling bearing 2 through an interference fit, and the extension of the transmission shaft The end is fixedly connected with the pulley hub 1, so that the power of the engine outside the casing can be transmitted to the impeller 4 through the belt, and the water pumping function of the water pump can be realized by the rotation of the impeller 4. Wherein, in order to avoid excessive leakage of water in the water-absorbing chamber, a waterproof seal, namely the water seal 5, is installed between the transmission shaft mounting hole on the water-absorbing chamber and the transmission shaft. The water pump of this structure is widely used in the engine. However, limited by its own structure, the water pump is generally installed on the front face of the body, and forms a vortex chamber with the body on the front face. The coolant enters the water pump from the front end, which will increase The overall length of the engine limits the choice of engine installation space.

In addition, in this solution, the water seal 5 is arranged between the impeller 4 and the bearing 2, and is located in front of the water inlet of the impeller 4. When the cooling liquid flows from the casing 3 to the impeller 4, it is easy to form a vortex, so that the eddy current loss will lead to a decrease in efficiency. Moreover, it is easy to cause the angle at which the fluid enters the impeller 4 to deviate from the design range, resulting in phenomena such as impact loss and cavitation. In addition, under working conditions, the coolant at the water inlet of the impeller 4 of the water pump is often under negative pressure, while the back of the impeller 4 of the water pump is under a relatively high positive pressure. The impeller 4, water seal 5, and bearing 2 directly affect the reliability of the bearing and water seal connection system.

In view of this, it is urgent to find another way to improve the basic structure of the engine water pump, so as to overcome the defect that the overall length of the engine in the prior art cannot be effectively controlled.

Utility model content

In view of the above defects, the technical problem solved by the utility model is to provide an engine water pump, which can effectively control the influence of setting the engine water pump on the axial dimension of the whole machine through structural optimization.

The water pump for engines provided by the utility model includes impellers, shaft seals and bearings arranged in sequence along the axial direction of the transmission shaft; the vortex chamber of the water pump is surrounded by a pump body and a cover, and the input end Extending from the cover body, the liquid inlet side of the impeller placed in the vortex chamber is facing the pump body; wherein, the liquid inlet flow channel communicating with the vortex chamber is opened on the pump body.

Preferably, the inner connecting section of the liquid inlet passage communicated with the vortex chamber is arranged axially opposite to the impeller.

Preferably, the inner connecting section is extended and bent to form an outer connecting section of the liquid inlet channel.

Preferably, both the shaft seal and the bearing are built in the cover body, and the liquid outlet channel is opened on the pump body.

Preferably, an annular gap is formed between the other end surface of the impeller and the cover, and the annular gap radially divides the space between the impeller and the cover to form an inner space and an outer space; The axial through hole opened on the impeller communicates with the inner space, and the outer space communicates with the liquid outlet channel.

Preferably, the annular gap is formed along the axial direction.

Preferably, the end surface of the impeller has a first axially extending annular rib, and the inner surface of the cover has a correspondingly arranged axially extending second annular rib; the first annular rib and the second Of the annular ribs, one is inserted into the other and forms the annular gap in the axial direction.

Preferably, the cover body in the inner space has radially extending spoiler ribs; the inner diameter of the spoiler ribs changes gradually from inside to outside along the axial direction.

Preferably, discharge holes are provided on the shaft seal and the cover of the bearing.

Preferably, a casing seal is provided between the joint surfaces of the pump body and the cover body.

Compared with the prior art, the utility model proposes the improvement of the structural principle, and its vortex chamber is formed by the enclosure of the pump body and the cover body, so that the water pump with an independent vortex chamber has no installation restrictions; specifically, the input end of the transmission shaft Protruding from the cover body, it is used to establish connection with the engine power output on the front side. The liquid inlet side of the impeller placed in the vortex chamber faces the pump body, and the liquid inlet flow channel is opened on the pump body. With such a setting, the water pump can be installed on the side of the engine, and the liquid inlet part is relatively located at the rear, which does not occupy the size of the front end of the engine. Therefore, the problem of the overall length of the engine after the assembly is completed can be completely avoided. It improves its applicability, has the characteristics of reliable operation and compact structure, and meets the mainstream trend requirements of existing structural design.

In the preferred solution of the present utility model, a further improvement is made on the structural form of the inner connection section of the liquid inlet channel which communicates with the vortex chamber, and the inner connection section is arranged axially opposite to the impeller. Therefore, it can ensure that the liquid flow enters the impeller in a laminar flow state to the greatest extent, reduce eddy current loss, make the liquid flow enter the impeller at an optimal design angle, and reduce the impact loss on the blade and the risk of cavitation.

In another preferred solution of the present utility model, both the shaft seal and the bearing are built into the cover, and an annular gap is formed between the other end surface of the impeller and the cover, and the annular gap radially divides the space between the impeller and the cover. The space forms an inner space and an outer space, thereby establishing a choke ring structure. Correspondingly, the axial through hole opened on the impeller communicates with the inner space, and the outer space communicates with the liquid outlet channel. With this setting, the high-pressure coolant pressurized by the impeller will enter the back of the impeller from the gap between the impeller and the cover body, and the pressure of the high-pressure coolant will become lower after being throttled by the throttle ring structure. Since the pressure at the impeller inlet is the lowest, therefore, It can reduce the axial force caused by the pressure difference between the front and rear of the impeller axially, make the impeller work more reliably, and improve the service life of the shaft seal and the bearing.

In yet another preferred solution of the present utility model, there is a radially extending spoiler rib on the cover body in the inner space; the inner diameter of the spoiler rib changes gradually from inside to outside along the axial direction. . In this way, when the impeller is working, the coolant behind it is driven to rotate. When the coolant hits the spoiler, the liquid flow is disturbed to the shaft seal, thereby cooling and lubricating the friction pair of the shaft seal, which can further improve the shaft seal. The service life of the seal.

The engine water pump provided by the utility model can be applied to any form of engine water cooling system.

Description of drawings

Fig. 1 is a schematic structural view of a typical water pump in the prior art;

2 is a schematic diagram of the overall structure of the water pump for the engine described in the specific embodiment;

Fig. 3 is an enlarged view of part C of Fig. 2;

Fig. 4 is a D-direction view of the cover shown in Fig. 2 .

In Figure 2-Figure 4:

Transmission shaft 10, impeller 20, axial through hole 21, first annular rib 22, shaft seal 30, bearing 40, pump body 50, inlet flow channel 51, inner connection section 511, outer connection section 512, outlet flow channel 52 , installation hole 53 , cover body 60 , second annular rib 61 , spoiler rib 62 , and discharge hole 63 .

Detailed ways

The core of the utility model is to provide a structurally optimized engine water pump, so as to avoid the problem of occupying the axial installation size of the engine after the water pump is assembled through structural improvement, thereby effectively improving its adaptability. The present embodiment will be described in detail below in conjunction with the accompanying drawings.

Please refer to FIG. 2 , which is a schematic diagram of the overall structure of the water pump for the engine according to this embodiment, which is an axial sectional view.

Same as the prior art, the water pump for the engine is also in the form of impeller drive, including an impeller 20, a shaft seal 30 and a bearing 40 arranged in sequence along the axial direction of the transmission shaft 10; as the transmission shaft 10 rotates, the impeller 20 is driven The synchronous rotation realizes the function of pumping water. It should be understood that the specific structures and working principles of the impeller 20, the shaft seal 30 and the bearing 40 have not been substantially changed, and those skilled in the art can implement them using existing technologies. For example, the shaft seal 30 adopts double silicon carbide water seals, and the bearings 40 adopts linkage bearings, which will not be repeated in this paper.

The vortex chamber of the water pump is enclosed by the pump body 50 and the cover body 60, and the input end of the transmission shaft 10 protrudes from the cover body 60 so as to establish a transmission connection with the power output of the engine; specifically, the input end can be configured with a pulley or The sprocket realizes the power transmission. The liquid inlet side of the impeller 20 placed in the vortex chamber faces the pump body 50 , and the liquid inlet channel 51 communicating with the vortex chamber is opened on the pump body 50 . After the assembly with the engine body is completed, the water pump can be located at the side of the engine, and the liquid inlet part is located at a relatively rear position, which does not occupy the size of the front end of the engine. It should be noted that the installation hole 53 opened on the water pump for assembling with the engine is not limited to the arrangement shown in the figure, in fact, the arrangement of the installation hole 53 should also consider the overall arrangement of other accessories of the engine.

In order to avoid eddy current loss, reduce the impact loss and the risk of discouraging the blades of the impeller 20, further as shown in the figure, the inner connection section 511 of the liquid inlet channel 51 communicated with the vortex chamber is arranged axially opposite to the impeller 20; In the liquid inlet direction, the inner section 511 of the liquid inlet channel 51 is located on the downstream side of the outer section 512 . That is to say, the inner cavity of the inner section 511 directly connected to the vortex chamber is approximately a straight section. When the cooling medium enters the liquid inlet channel 51, it can ensure that the liquid flow enters the impeller 20 in a laminar flow state to the greatest extent, as shown by the arrow D in Figure 2, thereby reducing the eddy current loss and allowing the liquid flow to enter the impeller 20 at the best design angle. The impeller 20 effectively reduces the impact loss on the blade and the risk of cavitation. On this basis, the inner connecting section 511 can be extended and bent to form the outer connecting section 512 of the liquid inlet channel 51. Obviously, the outer connecting section 512 can be bent in any form according to the adjacent configuration relationship, and it does not occupy the engine's space in comparison. Axial dimension space.

In this solution, the liquid outlet channel 52 is also opened on the pump body 50 , and the shaft seal 30 and the bearing 40 are both built in the cover body 60 . Of course, based on the basic function of forming a vortex chamber enclosed with the pump body 50 , the shaft seal 30 can also be built in the pump body 50 .

Here, in order to further avoid the pressure difference on both sides of the impeller 20 to form an axial force, an annular gap L may be formed between the other end surface of the impeller 20 and the cover body 60, and the annular gap L radially divides the gap between the impeller 20 and the cover body 60. The space between forms an inner space A and an outer space B; thus, a choke ring structure is established. As shown in the figure, the axial through hole 21 opened on the impeller 20 communicates with the inner space A, and the outer space communicates with the liquid outlet channel. During the working process, the high-pressure coolant pressurized by the impeller 20 will enter the back of the impeller 20 from the gap between the impeller 20 and the cover body 60, and the pressure of the high-pressure coolant will become lower after being throttled by the throttle ring structure. The axial force caused by the axial pressure difference between the front and rear of the small impeller 20 makes the impeller 20 work more reliably, thereby further improving the service life of the shaft seal 30 and the bearing 40 .

As shown in the figure, the annular gap L is formed in the axial direction. It should be noted that the annular gap L can be arranged in different forms, as long as the above functional requirements are met, all are within the protection scope of the present application. For example, a radial arrangement or an oblique arrangement at a certain angle with the axial direction, of course, from the perspective of processing and assembly manufacturability, forming the annular gap L along the axial direction is the optimal solution.

Further combined with FIG. 2 and FIG. 3 , wherein FIG. 3 is an enlarged view of part C of FIG. 2 . There is an axially extending first annular rib 22 on the end face of the impeller 20, and correspondingly, there is an axially extending second annular rib 61 on the inner surface of the cover body 60; and, the second annular rib 61 is inserted into the first annular An annular gap L is formed in the rib 22 and in the axial direction between the outer peripheral surface of the second annular rib 61 and the inner peripheral surface of the first annular rib 22 .

Thus, while adapting to the working rotation of the impeller 20, a throttle ring structure is established. It should be understood that the first annular rib 22 on the impeller 20 and the second annular rib 61 on the cover 60 are arranged in reverse, that is, the first annular rib 22 is inserted into the second annular rib 61 (not shown in the figure) , that is, the aforementioned annular gap L is formed between the outer peripheral surface of the first annular rib 22 and the inner peripheral surface of the second annular rib 61 .

In addition to the aforementioned functional features of the water pump for the engine, a further optimized design can also be made from the cooling and lubrication of the shaft seal 30 . Please refer to FIG. 3 and FIG. 4 together, wherein FIG. 4 is a D-direction view of the cover shown in FIG. 2 .

As shown in the figure, the cover body 60 in the inner space A has radially extending spoiler ribs 62; in this way, when the impeller 20 is working, it drives the coolant behind to swirl, and when the coolant hits the spoiler ribs 62 , the liquid flow is disturbed to the shaft seal 30 , as shown by the water flow arrow in FIG. 3 , so as to effectively cool and lubricate the friction pair of the shaft seal 30 . Certainly, in order to obtain a better spoiling effect, as shown in FIG. 3 , the inner diameter of the spoiler rib 62 changes gradually along the axial direction from inside to outside.

In addition, the shaft seal 30 and the cover body 60 of the bearing 40 can be provided with a drain hole 63, so that the coolant that enters between the shaft seal 30 and the bearing 40 can be discharged in time, so as to avoid excessive accumulation and affect the use status of both. . In addition, a casing seal 70 is provided between the joint surfaces of the pump body 50 and the cover body 60 to improve working reliability. Preferably, the casing seal 70 adopts an "O" type seal.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (10)

1. an engine water pump, comprises the impeller axially setting gradually, shaft seal and bearing along transmission shaft; It is characterized in that, the volute chamber of described water pump is enclosed and is formed by the pump housing and lid, and the input end of described transmission shaft stretches out from described lid, and the liquid feeding side that is placed in the described impeller in described volute chamber is towards the described pump housing; Wherein, the feed liquor runner that is communicated with described volute chamber is opened on the described pump housing.

2. engine water pump according to claim 1, is characterized in that, described feed liquor runner be communicated with described volute chamber in the section of connecing, with described impeller shaft to being oppositely arranged.

3. engine water pump according to claim 2, is characterized in that, described in the section of connecing extend and to be bent to form external section of described feed liquor runner.

4. according to the engine water pump described in any one in claims 1 to 3, it is characterized in that, described shaft seal and bearing are all built in described lid, and fluid runner is opened on the described pump housing.

5. engine water pump according to claim 4, it is characterized in that, between the opposite side end face of described impeller and described lid, form annular space, the space between described impeller and described lid is radially cut apart in described annular space, forms inner space and outer space; The axial pass-through holes of offering on described impeller is communicated with described inner space, and described outer space is communicated with fluid runner.

6. engine water pump according to claim 5, is characterized in that, described annular space forms vertically.

7. engine water pump according to claim 6, is characterized in that, the end face of described impeller has axially extended the first ring rib, has axially extended second ring rib of relative set on the internal surface of described lid; In described the first ring rib and described the second ring rib, one is inserted in another one and is formed vertically described annular space.

8. engine water pump according to claim 7, is characterized in that, on the described lid in described inner space, has the flow-interfering bar radially extending to form; The internal diameter size of described flow-interfering bar, is from the inside to the outside vertically the trend increasing progressively gradually and changes.

9. engine water pump according to claim 4, is characterized in that, on the described lid of described shaft seal and bearing, offers discharge orifice.

10. engine water pump according to claim 1, is characterized in that, between the described pump housing and the mating face of lid, is provided with housing seal part.