Sealing structure suitable for rotor pump

Abstract

The embodiment of the invention provides a sealing structure suitable for a rotor pump. The sealing structure comprises a pump body 1, a gear 2, a sliding bearing 3, a front cover 4, a rear cover 5, a rear O-shaped ring 6 and a front O-shaped ring 7. The gear 2 and the sliding bearing 3 form a dimension chain which is arranged in an 8-shaped hole of the pump body 1; the rear O-shaped ring 6 and the front O-shaped ring 7 are sealing rubber rings; the front O-shaped ring 7 is embedded between the pump body 1 and the front cover 4, the rear O-shaped ring 6 is embedded between the pump body 1 and the rear cover 5, and the gap of a pump set is controlled through the sealing effect of rubber and the machining size. By providing a pure mechanical seal ring control clearance gear pump structure, after a pump set operates for a period of time, a medium in the pump is directly sealed through an O-shaped ring at the end face, the phenomenon of swelling cannot be generated, the end face clearance cannot be increased, the effects of reducing internal leakage of the pump set and ensuring normal operation of the pump set are achieved, and meanwhile the gear pump has the advantages of being simple in structure, convenient to operate and the like. And the use is durable.

Description

Technical Field

[0001] The present application relates to the technical field of volumetric pump equipment, and in particular to a sealing structure suitable for a rotor pump. Background Art

[0002] The existing conventional gear pump is a gear pump that rotates and drives with two metal rotors in contact and meshing. The control of the clearance is the key point in the design process of the gear pump. The control of the end face clearance is related to the realization of the main performance parameters of the gear pump. Large end face leakage will lead to insufficient flow of the pump group.

[0003] At present, the two ends of the gear pump are sealed with gaskets, such as oil-resistant non-asbestos fiberboard or lead gaskets. When the gasket is in contact with the medium for a long time, it will swell due to the adsorption of the medium, resulting in changes in the end face gap and a decrease in the flow rate of the pump.

[0004] The clearance control of gear pump is mainly controlled by the processing dimensions of pump body, gear, sliding bearing, front cover, rear cover, rear cover gasket and front cover gasket. When the pump runs for a long time, the oil-resistant asbestos-free fiberboard gasket on the end face swells under the immersion of oil, resulting in the increase of the distance between the pump body and the front cover, and between the pump body and the rear cover, which causes the size chain of the sliding bearing and gear inside the pump body to be much smaller than the total length of the pump body, thus increasing the clearance of the end face.

[0005] When the end face clearance increases, the leakage of the pump group increases, the medium leaks from the end face where the gear contacts the sliding bearing, the amount of medium flowing through the gear tooth surface decreases, and the volume of medium transported per rotation of the gear decreases, resulting in a decrease in the flow rate of the pump group. As the volume of the medium decreases, the lubricating effect of the medium on the gear also decreases, resulting in the inability to form a lubricating oil film on the two meshing gears, resulting in wear and tear, which further reduces the flow rate. Summary of the invention

[0006] The present invention is developed based on an existing conventional gear pump and relates to an end face sealing structure of a positive displacement gear pump, and in particular to a mechanical design structure capable of preventing the gear pump from leaking when there is no gasket on the end face.

[0007] The embodiment of the present invention provides a sealing structure suitable for a rotor pump, comprising: a pump body 1, a gear 2, a sliding bearing 3, a front cover 4, a rear cover 5, a rear O-ring 6, and a front O-ring 7;

[0008] The gear 2 and the sliding bearing 3 form a dimension chain and are installed in the 8-shaped hole of the pump body 1;

[0009] The rear O-ring 6 and the front O-ring 7 are sealing rubber rings;

[0010] The front O-ring 7 is embedded between the pump body 1 and the front cover 4, and the rear O-ring 6 is embedded between the pump body 1 and the rear cover 5. The gap of the pump group is controlled by the sealing effect of the rubber and the processing size.

[0011] In some embodiments, the front cover sealing adjustment structure is connected by installing the front cover 4 and the front O-ring 7 through machining dimensions. When the clearance of the pump group is determined, the value of the clearance is ensured through machining. After the gear 2 and the sliding bearing 3 are installed inside the pump body 1, the front O-ring 7 is installed on the front cover 4 and connected to the pump body 1 through bolts.

[0012] In some embodiments, the rear cover sealing adjustment structure is connected by installing the rear cover 5 and the rear O-ring 6 through mechanical processing dimensions. When the clearance of the pump group is determined, the value of the clearance is guaranteed through processing. After the gear 2 and the sliding bearing 3 are installed inside the pump body 1, the rear O-ring 6 is installed on the rear cover 5 and connected to the pump body 1 through bolts.

[0013] In some embodiments, after the pump unit has been running for a period of time, the medium is sealed at the end surface by the rear O-ring 6 and the front O-ring 7 , and the front cover 4 or the rear cover 5 is in direct contact with the pump body 1 .

[0014] In some embodiments, the difference between the size of the gear 2 and the sliding bearing 3 and the total length of the pump body 1 is the clearance value that should be retained.

[0015] In some embodiments, the material of the rear O-ring 6 and the front O-ring 7 is oil-resistant rubber.

[0016] The above-mentioned embodiment of the present invention provides a purely mechanical sealing ring controlled clearance gear pump structure. After the pump group has been running for a period of time, the medium in the pump is directly sealed at the end face by the O-ring, and no swelling phenomenon will occur, which will cause the end face gap to increase, thereby reducing the internal leakage of the pump group and ensuring the normal operation of the pump group. At the same time, it has the advantages of simple structure and durable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0018] Figure 1 A schematic cross-sectional structure diagram of a sealing structure applicable to a rotor pump is provided for an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the partial structure of the front O-ring and the front cover;

[0020] Figure 3 It is a schematic diagram of the partial structure of the rear O-ring and the rear cover;

[0021] Figure 4 For the corresponding Figure 1 Left view of;

[0022] Figure 5 For the corresponding Figure 1 The top view of

[0023] Figure 6 For the corresponding Figure 1 Oblique view of . DETAILED DESCRIPTION

[0024] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0025] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0026] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0027] The present invention provides a seal ring controlled clearance gear pump structure comprising two identical O-rings and a specially designed front cover and rear cover. Figure 2 shown.

[0028] like Figure 1 As shown in the figure, the seal ring controls the clearance gear pump structure, and its overall clearance control structure consists of a pump body 1, a gear 2, a sliding bearing 3, a front cover 4, a rear cover 5, a rear O-ring 6, and a front O-ring 7. The gear 2 and the sliding bearing 3 form a dimension chain and are installed in the 8-shaped hole of the pump body 1. The clearance value to be retained is calculated based on the flow rate, that is, the difference between the size of the gear 2 and the sliding bearing 3 and the total length of the pump body. The end face is no longer added with an oil-resistant asbestos-free fiberboard gasket for the calculation and processing of the dimension chain, but the front O-ring 7 and the rear O-ring 8 are embedded between the front cover 7 and the rear cover 6. The control of the pump group clearance is completely guaranteed by the sealing effect of the rubber and the processing size, and is no longer affected by the uncertainty of the swelling of the oil-resistant asbestos-free fiberboard gasket.

[0029] like Figure 2 As shown, the seal ring controls the clearance gear pump structure, and its front cover seal adjustment structure is connected by the front cover 4 and the front O-ring 7 through the machining size installation. When the pump group clearance is determined, the clearance value is guaranteed through processing, and the gear 2 and the sliding bearing 3 are installed inside the pump body 1, and the front O-ring 7 is installed on the front cover 4, and connected with the pump body 1 through bolts. After the pump group runs for a period of time, the medium is sealed by the O-ring at the end face, and the front cover 4 is in direct contact with the pump body 1. The gap will not increase due to the swelling phenomenon of the gasket seal, thereby affecting the performance of the pump.

[0030] like Figure 3 As shown, the seal ring controls the clearance gear pump structure, and its rear cover seal adjustment structure is connected by the rear cover 5 and the rear O-ring 6 through the machining size installation. When the pump group clearance is determined, the clearance value is guaranteed through processing, and the gear 2 and the sliding bearing 3 are installed inside the pump body 1, and the rear O-ring 6 is installed on the rear cover 5, and connected with the pump body 1 through bolts. After the pump group runs for a period of time, the medium is sealed by the rear O-ring 6 at the end face, and the rear cover 5 is in direct contact with the pump body 1. The gap will not increase due to the swelling phenomenon of the gasket seal, thereby affecting the performance of the pump.

[0031] like Figures 4 to 6 As shown, it is a corresponding embodiment of the present invention Figure 1 The left view, top view and oblique view of the pump are shown in the figure. The inlet and outlet positions of the pump are indicated. The O-ring seal is adopted, and the radial dimension chain is no longer adjusted by the traditional oil-resistant asbestos-free fiberboard gasket. The clearance of the gear pump is fully controlled by machining the dimensions. After the pump is started for a period of time, the medium flows through the end surface where the pump body 1 contacts the front cover 4 and the rear cover 5. The rear O-ring 6 and the front O-ring 7 seal the medium at the end surface. The swelling phenomenon caused by the oil-resistant asbestos-free fiberboard gasket will not occur, so that the value of the clearance can be guaranteed to remain unchanged for a long time, the internal leakage of the pump can be reduced, and the pump group can be guaranteed to operate under normal parameters.

[0032] The above-mentioned embodiment of the present invention provides a purely mechanical sealing ring controlled clearance gear pump structure. After the pump group has been running for a period of time, the medium in the pump is directly sealed at the end face by the O-ring, and no swelling phenomenon will occur, which will cause the end face gap to increase, thereby reducing the internal leakage of the pump group and ensuring the normal operation of the pump group. At the same time, it has the advantages of simple structure and durable use.

[0033] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0034] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A sealing structure suitable for a rotor pump, characterized in that: include: Pump body (1), gear (2), sliding bearing (3), front cover (4), rear cover (5), rear O-ring (6), front O-ring (7); The gear (2) and the sliding bearing (3) form a dimension chain and are installed in the 8-shaped hole of the pump body (1); The rear O-ring (6) and the front O-ring (7) are sealing rubber rings; The front O-ring (7) is embedded between the pump body (1) and the front cover (4), and the rear O-ring (6) is embedded between the pump body (1) and the rear cover (5), and the pump group clearance is controlled by the sealing effect of the rubber and the processing size.

2. The sealing structure suitable for a rotor pump according to claim 1, characterized in that: The front cover seal adjustment structure is connected by the front cover (4) and the front O-ring (7) through mechanical processing dimensions. When the clearance of the pump group is determined, the clearance value is guaranteed through processing. After the gear (2) and the sliding bearing (3) are installed inside the pump body (1), the front O-ring (7) is installed on the front cover (4) and connected to the pump body (1) through bolts.

3. The sealing structure suitable for a rotor pump according to claim 1, characterized in that: The rear cover seal adjustment structure is connected by the rear cover (5) and the rear O-ring (6) through mechanical processing dimensions. When the clearance of the pump group is determined, the clearance value is guaranteed through processing. After the gear (2) and the sliding bearing (3) are installed inside the pump body (1), the rear O-ring (6) is installed on the rear cover (5) and connected to the pump body (1) through bolts.

4. The sealing structure suitable for a rotor pump according to claim 2 or 3, characterized in that: After the pump unit has been running for a period of time, the medium is sealed at the end surface by the rear O-ring (6) and the front O-ring (7), and the front cover (4) or the rear cover (5) is in direct contact with the pump body (1).

5. The sealing structure suitable for a rotor pump according to claim 1, characterized in that: The difference between the size of the gear (2) and the sliding bearing (3) and the total length of the pump body (1) is the clearance value that should be retained.

6. The sealing structure suitable for a rotor pump according to claim 1, characterized in that: The material of the rear O-ring (6) and the front O-ring (7) is oil-resistant rubber.

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