Universal sealing gland and oil collecting cavity combination device of screw pump

Abstract

The utility model discloses a universal sealing gland and oil collecting cavity combination device for a screw pump, which belongs to the field of screw pumps and comprises a sealing gland, an oil collecting cavity, a fastener and a sealing element. The sealing gland is arranged on the screw pump in a wrapping mode, and a sealing piece is arranged at the connecting position of the sealing gland and the screw pump. The fastening piece penetrates through the first fastening piece installation hole of the sealing gland and the second fastening piece installation hole of the oil collecting cavity, the sealing piece is a mechanical seal or a framework seal, or the mechanical seal and the framework seal are assembled at the same time. According to the utility model, both the mechanical seal and the framework seal can be independently mounted; by means of the combination of the sealing gland and the oil collecting cavity, the double-sealing mode that a mechanical seal and a framework seal are installed at the same time can be achieved, the sealing performance of a product is improved, and the requirements of users are met; the system can better meet the needs of production management, inventory management and cost management, simplifies and facilitates various management processes, reduces the cost, and better meets the demands of users.

Description

Technical Field

[0001] The utility model relates to the field of screw pumps, and particularly to a combined device of a universal seal gland and an oil collecting cavity for a screw pump. Background Technique

[0002] In existing screw pump products, mechanical seals or skeleton seals are generally used to seal the conveyed medium, and an oil collecting cavity is used to collect the leaked medium. In this way, there will be components such as mechanical seal glands, skeleton seal glands, and oil collecting cavities. After these seal glands and oil collecting cavities are combined, the installation of mechanical seals or skeleton seals can be achieved.

[0003] Due to the requirements of existing working conditions for the selection of sealing methods, there are various sealing method requirements such as installing mechanical seals alone, installing skeleton seals alone, and double seals with both mechanical seals and skeleton seals installed at the same time. However, the components of the existing technology can only support the selection of installing mechanical seals alone or installing skeleton seals alone, and can only be achieved by using a combination of multiple components. Therefore, there are certain disadvantages in the selection of sealing methods that meet the working conditions and the production management of related components. Content of the Utility Model

[0004] Regarding some existing problems, the purpose of the utility model is to provide a combined device of a universal seal gland and an oil collecting cavity for a screw pump. The utility model provides a combination of a universal seal gland and an oil collecting cavity for a screw pump that can not only install mechanical seals independently, but also install skeleton seals independently, and can also install both seals at the same time, and can save production and management costs, so as to solve the problems proposed in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A combined device of a universal seal gland and an oil collecting cavity for a screw pump includes a seal gland, an oil collecting cavity, fasteners, and seals; the seal gland is wrapped around the screw pump, and a seal is provided at the connection between the seal gland and the screw pump;

[0007] The outer wall of the seal gland is connected to the oil collecting cavity. The seal gland is provided with a mechanical seal installation hole, a mechanical seal positioning circle, a skeleton seal installation hole, a skeleton seal positioning circle, a first fastener installation hole, and an oil return hole; the oil collecting cavity is provided with an oil collecting cavity, a second fastener installation hole, a skeleton seal limiting circle, and an oil return groove; the fasteners pass through the first fastener installation hole of the seal gland and the second fastener installation hole of the oil collecting cavity, and the oil collecting cavity is communicated with the oil return hole on the seal gland through the oil return groove.

[0008] As a further solution of the present utility model: The seal is a mechanical seal, which is installed in the mechanical seal installation hole of the seal gland, and the oil collecting cavity is installed on the seal gland.

[0009] As a further solution of the present utility model: The seal is a skeleton seal, which is installed in the skeleton seal installation hole of the seal gland, and the oil collecting cavity is installed on the seal gland.

[0010] As a further solution of the present utility model: The seal is an assembly combination of a mechanical seal and a skeleton seal. The mechanical seal is installed in the mechanical seal installation hole of the seal gland, the skeleton seal is installed in the skeleton seal installation hole of the seal gland, and the oil collecting cavity is installed on the seal gland.

[0011] As a further solution of the present utility model: The outer diameter dimension d1 of the positioning circle of the mechanical seal is equal to the outer diameter dimension d2 of the positioning circle of the skeleton seal, that is, d1 = d2.

[0012] As a further solution of the present utility model: The depth dimension L5 of the oil collecting cavity is greater than the depth dimension L4 of the limiting circle of the skeleton seal, and the depth dimension L6 of the oil return groove is greater than the depth dimension L5 of the oil collecting cavity, that is, the relationship of the three depth dimensions is L6 > L5 > L4.

[0013] As a further solution of the present utility model: The inner hole dimension d5 of the oil collecting cavity on the oil collecting cavity body is greater than the outer diameter dimension d2 of the skeleton seal positioning circle on the seal gland, that is, d5 > d2, and the outer diameter dimension d4 of the limiting circle of the skeleton seal on the oil collecting cavity body is less than the dimension d3 of the skeleton seal installation hole on the seal gland, that is, d4 < d3.

[0014] As a further solution of the present utility model: The length dimension L1 of the mechanical seal positioning circle on the seal gland is less than the depth dimension L4 of the limiting circle of the skeleton seal on the oil collecting cavity body, that is, L1 < L4, and the length dimension L2 of the skeleton seal positioning circle on the seal gland is less than the depth dimension L5 of the oil collecting cavity on the oil collecting cavity body, that is, L2 < L5; The relationship between the depth dimension L3 of the skeleton seal installation hole on the seal gland and L2, L4, L5 is L5 - L2 > L3 - L4.

[0015] As a further solution of the present utility model: The installation pitch circle d6 of the first fastener installation hole on the seal gland is the same as the installation pitch circle d7 of the second fastener installation hole on the oil collecting cavity body, that is, d6 = d7.

[0016] Compared with the prior art, the beneficial effects of the present utility model are:

[0017] The utility model utilizes a combination of a sealing gland and an oil collecting cavity to replace the original combination forms of a mechanical sealing gland and an oil collecting cavity, as well as a skeleton sealing gland and an oil collecting cavity. It can install a mechanical seal independently and can also install a skeleton seal independently. By using this combination of the sealing gland and the oil collecting cavity, a dual-seal form of simultaneously installing a mechanical seal and a skeleton seal can be achieved, which the original mechanical sealing gland and skeleton sealing gland do not have. This improves the sealing performance of the product and meets the needs of users. Moreover, it can better meet the requirements of current production management, inventory management, and cost management, simplifies and facilitates various management processes, reduces costs, and at the same time, there are multiple sealing form options in the use at the user site, which is more in line with the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 FIG. is a schematic diagram of simultaneously installing a mechanical seal and a skeleton seal for a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0019] Figure 2 FIG. is a schematic diagram of separately installing a mechanical seal for a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0020] Figure 3 FIG. is a schematic diagram of separately installing a skeleton seal for a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0021] Figure 4 FIG. is a schematic diagram of one side structure of the sealing gland in a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0022] Figure 5 FIG. is a schematic diagram of the other side structure of the sealing gland in a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0023] Figure 6 FIG. is a schematic diagram of one side structure of the oil collecting cavity in a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0024] Figure 7 FIG. is a schematic diagram of the other side structure of the oil collecting cavity in a combined device of a general-purpose sealing gland and an oil collecting cavity of a screw pump.

[0025] In the figures: 1. Sealing gland; 2. Oil collecting cavity; 3. Fastener; 4. Mechanical seal; 5. Skeleton seal; 11. Mechanical seal installation hole; 12. Mechanical seal positioning circle; 13. Skeleton seal installation hole; 14. Skeleton seal positioning circle; 15. First fastener installation hole; 16. Oil return hole; 21. Oil collecting chamber; 22. Second fastener installation hole; 23. Skeleton seal limiting circle; 24. Oil return groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model; it is obvious that the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "coupled" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] Please refer to Figure 1-7 , a combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump, including a sealing gland 1, an oil collecting cavity 2, a fastener 3 and a sealing member;

[0029] The sealing gland 1 is wrapped around the screw pump, and a sealing member is provided at the connection between the sealing gland 1 and the screw pump;

[0030] The outer wall of the sealing gland 1 is connected to the oil collecting cavity 2. The sealing gland 1 is provided with a mechanical seal mounting hole 11, a mechanical seal positioning circle 12, a skeleton seal mounting hole 13, a skeleton seal positioning circle 14, a first fastener mounting hole 15 and an oil return hole 16; the oil collecting cavity 2 is provided with an oil collecting cavity 21, a second fastener mounting hole 22, a skeleton seal limiting circle 23 and an oil return groove 24; the fastener 3 passes through the first fastener mounting hole 15 of the sealing gland 1 and the second fastener mounting hole 22 of the oil collecting cavity 2 to ensure the stable connection between the sealing gland 1 and the oil collecting cavity 2.

[0031] The sealing member is assembled with any one of a mechanical seal 4 and a skeleton seal 5, or the mechanical seal 4 and the skeleton seal 5 are assembled simultaneously;

[0032] When the mechanical seal 4 is assembled alone, the mechanical seal 4 is installed in the mechanical seal mounting hole 11 of the sealing gland 1, positioned by the mechanical seal positioning circle 12 and positioning parts, then the oil collecting cavity 2 is installed on the sealing gland 1, and finally fastened by the fastener 3 to complete the operation of assembling the mechanical seal alone;

[0033] When separately assembling the skeleton seal 5, install the skeleton seal 5 in the skeleton seal installation hole 13 of the seal gland 1, position it with the positioning part through the skeleton seal positioning circle 14, then install the oil collecting cavity 2 on the seal gland 1, and finally fasten it with the fastener 3 to complete the operation of separately assembling the skeleton seal;

[0034] When simultaneously assembling the mechanical seal 4 and the skeleton seal 5, install the mechanical seal 4 in the mechanical seal installation hole 11 of the seal gland 1, and at the same time install the skeleton seal 5 in the skeleton seal installation hole 13 of the seal gland 1, position it with the positioning part through the mechanical seal positioning circle 12, then install the oil collecting cavity 2 on the seal gland 1. At this time, the skeleton seal positioning circle 12 on the seal gland 1 will limit the skeleton seal 5 well. Finally, fasten it with the fastener 3 to complete the operation of simultaneously assembling the mechanical seal and the skeleton seal;

[0035] Among them, the outer diameter size d1 of the mechanical seal positioning circle 12 needs to be equal to the outer diameter size d2 of the skeleton seal positioning circle 14, that is, d1 = d2; the mechanical seal 4 can be installed in the mechanical seal installation hole 11, and the skeleton seal 5 can be installed in the skeleton seal installation hole 13;

[0036] Among them, the depth dimension L5 of the oil collecting cavity 21 needs to be greater than the depth dimension L4 of the skeleton seal limiting circle 23, and the depth dimension L6 of the oil return groove 24 needs to be greater than the depth dimension L5 of the oil collecting cavity 21, that is, the depth dimensions of the three have a quantitative relationship of L6 > L5 > L4; the oil collecting cavity 21 is used to collect the medium leaking out when the seal fails, and is communicated with the oil return hole 16 on the seal gland 1 through the oil return groove 24 to form a collection loop for facilitating the collection of the leaking medium;

[0037] The inner diameter size d5 of the oil collecting cavity 21 on the oil collecting cavity 2 needs to be greater than the outer diameter size d2 of the skeleton seal positioning circle 14 on the seal gland 1, that is, d5 > d2, and the outer diameter size d4 of the skeleton seal limiting circle 23 on the oil collecting cavity 2 needs to be less than the size d3 of the skeleton seal installation hole 13 on the seal gland 1, that is, d4 < d3;

[0038] The length dimension L1 of the mechanical seal positioning circle 12 on the seal gland 1 needs to be less than the depth dimension L4 of the skeleton seal limiting circle 23 on the oil collecting cavity 2, that is, L1 < L4, and the length dimension L2 of the skeleton seal positioning circle 14 on the seal gland 1 needs to be less than the depth dimension L5 of the oil collecting cavity 21 on the oil collecting cavity 2, that is, L2 < L5; in addition, the depth dimension L3 of the skeleton seal installation hole 13 on the seal gland 1 also has a quantitative relationship of L5 - L2 > L3 - L4 with L2, L4, and L5;

[0039] The mounting pitch circle d6 of the first fastener mounting hole 15 on the sealing gland 1 needs to be the same as the mounting pitch circle d7 of the second fastener mounting hole 22 on the oil collecting cavity 2, i.e., d6 = d7;

[0040] The present utility model utilizes a combination of a sealing gland and an oil collecting cavity, which can replace the original combination forms of a mechanical seal gland and an oil collecting cavity, as well as a skeleton seal gland and an oil collecting cavity. It can install a mechanical seal independently and also install a skeleton seal independently;

[0041] The present utility model utilizes this combination of a sealing gland and an oil collecting cavity to achieve a double-seal form of simultaneously installing a mechanical seal and a skeleton seal, which is not possessed by the original mechanical seal gland and skeleton seal gland, improving the sealing performance of the product and meeting the needs of users;

[0042] The present utility model can better meet the needs of current production management, inventory management, and cost management, simplify and facilitate various management processes, reduce costs, and at the same time, there are also multiple sealing form options in the on-site use by users, which is more in line with the needs of users.

[0043] The working principle of the present utility model is as follows: The present utility model innovatively designs the sealing gland, changes the form that the sealing gland can only install one type of seal, designs a structure on one side of the sealing gland that can install a mechanical seal, and designs a structure on the other side that can install a skeleton seal. At the same time, this structural design can also meet the basic conditions for installing two seals simultaneously. Since the skeleton seal is an auxiliary seal when installing the double seal, but the skeleton seal needs to be limited at this time, a skeleton seal limiting circle needs to be set on the oil collecting cavity to accurately limit the skeleton seal. At the same time, the sealing gland and the oil collecting cavity also need to be able to meet the basic requirements such as oil collection and oil return.

[0044] For those skilled in the art; obviously, the present utility model is not limited to the details of the above exemplary embodiments; and without departing from the spirit or basic characteristics of the present utility model; the present utility model can be implemented in other specific forms. Therefore; from any point of view; the embodiments should be regarded as exemplary and non-limiting; the scope of the present utility model is defined by the appended claims rather than the above description; therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0045] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump, characterized in that, It includes a sealing gland (1), an oil collecting cavity (2), a fastener (3) and a seal; the sealing gland (1) is wrapped around the screw pump, and a seal is provided at the connection between the sealing gland (1) and the screw pump. The outer wall of the sealing gland (1) is connected to the oil collecting cavity (2). The sealing gland (1) is provided with a mechanical seal mounting hole (11), a mechanical seal positioning circle (12), a skeleton seal mounting hole (13), a skeleton seal positioning circle (14), a first fastener mounting hole (15) and an oil return hole (16); the oil collecting cavity (2) is provided with an oil collecting cavity (21), a second fastener mounting hole (22), a skeleton seal limiting circle (23) and an oil return groove (24); the fastener (3) passes through the first fastener mounting hole (15) of the sealing gland (1) and the second fastener mounting hole (22) of the oil collecting cavity (2), and the oil collecting cavity (21) communicates with the oil return hole (16) on the sealing gland (1) through the oil return groove (24).

2. The combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump according to claim 1, wherein, The seal is a mechanical seal (4), and the mechanical seal (4) is installed in the mechanical seal mounting hole (11) of the sealing gland (1), and the oil collecting cavity (2) is installed on the sealing gland (1).

3. The combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump according to claim 1, characterized in that, The seal is a skeleton seal (5), and the skeleton seal (5) is installed in the skeleton seal mounting hole (13) of the sealing gland (1), and the oil collecting cavity (2) is installed on the sealing gland (1).

4. A combined device of a general - type sealing gland and an oil - collecting cavity for a screw pump according to claim 1, characterized in that, The seal is an assembly combination of an assembled mechanical seal (4) and a skeleton seal (5). The mechanical seal (4) is installed in the mechanical seal mounting hole (11) of the sealing gland (1), the skeleton seal (5) is installed in the skeleton seal mounting hole (13) of the sealing gland (1), and the oil collecting cavity (2) is installed on the sealing gland (1).

5. A combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump according to claim 2 or 3 or 4, characterized in that, The outer diameter dimension d1 of the mechanical seal positioning circle (12) is equal to the outer diameter dimension d2 of the skeleton seal positioning circle (14), that is, d1 = d2.

6. A combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump according to claim 5, characterized in that, The depth dimension L5 of the oil collecting cavity (21) is greater than the depth dimension L4 of the skeleton seal limiting circle (23), and the depth dimension L6 of the oil return groove (24) is greater than the depth dimension L5 of the oil collecting cavity (21), that is, the depth dimension relationship among the three is L6 > L5 > L4.

7. A combined device of a general-purpose sealing gland and an oil collecting cavity for a screw pump according to claim 6, characterized in that, The inner hole dimension d5 of the oil collecting cavity (21) on the oil collecting cavity (2) is greater than the outer diameter dimension d2 of the skeleton seal positioning circle (14) on the sealing gland (1), that is, d5 > d2, and the outer diameter dimension d4 of the skeleton seal limiting circle (23) on the oil collecting cavity (2) is less than the dimension d3 of the skeleton seal mounting hole (13) on the sealing gland (1), that is, d4 < d3.

8. A combined device of a general - type sealing gland and an oil - collecting cavity for a screw pump according to claim 7, characterized in that, The length dimension L1 of the mechanical seal positioning circle (12) on the sealing gland (1) is less than the depth dimension L4 of the skeleton seal limiting circle (23) on the oil collecting cavity (2), that is, L1 < L4, and the length dimension L2 of the skeleton seal positioning circle (14) on the sealing gland (1) is less than the depth dimension L5 of the oil collecting cavity (21) on the oil collecting cavity (2), that is, L2 < L5; the relationship between the depth dimension L3 of the skeleton seal mounting hole (13) on the sealing gland (1) and L2, L4, L5 is L5 - L2 > L3 - L4.

9. The combined device of a general - type sealing gland and an oil - collecting cavity for a screw pump according to claim 8, wherein, The mounting pitch circle d6 of the first fastener mounting hole (15) on the sealing gland (1) is the same as the mounting pitch circle d7 of the second fastener mounting hole (22) on the oil collecting cavity (2), that is, d6 = d7.

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