Double-screw pump with high sealing performance

Abstract

The utility model relates to the technical field of screw pumps, and discloses a high-sealing-performance double-screw pump which comprises an outer shell and a screw arranged in the outer shell, the outer shell comprises a first sub-shell and a second sub-shell which are spliced, a bolt is connected between the first sub-shell and the second sub-shell, and the first sub-shell and the second sub-shell are connected through the bolt. A sealing mechanism is arranged between the first sub-shell and the second sub-shell and comprises a sheet-shaped sealing ring, the sealing ring is connected between the first sub-shell and the second sub-shell in an abutting mode, a first protrusion is arranged on the side, close to the sealing ring, of the first sub-shell, and a second protrusion is arranged on the side, close to the sealing ring, of the second sub-shell. The first protrusion and the second protrusion abut against the sealing ring. The number of the first protrusions and the number of the second protrusions are both multiple, and the first protrusions and the second protrusions are arranged in a staggered mode. The device is simple in structure and low in production cost; and the sealing performance between the first sub-shell and the second sub-shell is improved through the sealing mechanism, the problem of liquid leakage is avoided, and use is safe and reliable.

Description

Technical Field

[0001] This utility model relates to the field of screw pump technology, and more specifically, to a twin-screw pump with high sealing performance. Background Technology

[0002] A screw pump is a rotary pump that transports or pressurizes liquids by relying on the changing and moving volume of the meshing space formed by the pump body and the screw. Screw pumps are classified according to the number of screws, such as single-screw pumps, twin-screw pumps, and three-screw pumps. When the driving screw rotates, it drives the driven screw meshing with it to rotate as well. The volume of the screw meshing space at the suction end gradually increases, and the pressure decreases. Liquid enters the meshing space under the action of pressure difference. When the volume increases to its maximum and forms a sealed cavity, the liquid moves continuously axially within each sealed cavity until it reaches the discharge end. At this point, the screw meshing space at the discharge end gradually decreases, and the liquid is discharged. The outstanding advantages of screw pumps are that they do not form eddies when transporting media, are not sensitive to the viscosity of the media, and can transport high-viscosity media. Therefore, they are widely used in various industries.

[0003] Some existing twin-screw pumps have a larger housing than single-screw pumps, making them more difficult and costly to manufacture. To facilitate manufacturing and reduce costs, the housing of existing twin-screw pumps is assembled from multiple (two or more) separate housings. However, some existing twin-screw pumps are prone to liquid leakage at the joints of the housings, resulting in waste of the pumped liquid. If the leaked liquid is polluting, it can also cause environmental pollution or harm to human health. Utility Model Content

[0004] To address at least one of the aforementioned problems, this utility model provides a high-sealing twin-screw pump, comprising a housing and a screw disposed within the housing. The housing includes a first sub-housing and a second sub-housing connected together, connected by bolts. A sealing mechanism is provided between the first and second sub-housings, comprising a sheet-like sealing ring abutting between the first and second sub-housings. A first protrusion is provided on the side of the first sub-housing near the sealing ring, and a second protrusion is provided on the side of the second sub-housing near the sealing ring. Both the first and second protrusions abut against the sealing ring. Multiple first and second protrusions are provided, arranged in an alternating pattern. The bolts sequentially pass through the first sub-housing, the sealing ring, and the second sub-housing. This utility model features a simple structure and low production cost. By increasing the sealing performance between the first and second sub-housings through the sealing mechanism, liquid leakage is avoided, ensuring safe and reliable operation.

[0005] Optionally, the first sub-shell, the sealing ring, and the second sub-shell are all provided with mounting slots for installing the bolts. The bolts include studs, and the sealing mechanism further includes a sealing sleeve disposed on the outside of the stud. The outer wall of the sealing sleeve abuts against the inner wall of the mounting slot. The first protrusion and the second protrusion are both arc-shaped protrusions.

[0006] Optionally, one end of the sealing sleeve is provided with a first guide slope in an annular shape, the first guide slope being used to guide the sealing sleeve into the mounting groove.

[0007] Optionally, the sealing sleeve is made of rubber and is formed on the outside of the stud by injection molding.

[0008] Optionally, the first sub-shell is provided with a first flange in an annular shape, and the second sub-shell is provided with a second flange in an annular shape corresponding to the first flange. The sealing ring abuts between the first flange and the second flange, and the bolt passes through the first flange, the sealing ring and the second flange in sequence.

[0009] Optionally, one end of the bolt is threaded with a nut, and the first sub-shell and the second sub-shell are locked and fixed by the bolt and the nut. The locking force between the first sub-shell and the second sub-shell causes the sealing ring to abut against the first sub-shell and the second sub-shell.

[0010] Optionally, a first gasket abuts between the nut and the second sub-shell.

[0011] Optionally, the bolt further includes a bolt head, and a second washer is abutted between the bolt head and the first sub-shell.

[0012] Optionally, both the first gasket and the second gasket are made of polytetrafluoroethylene.

[0013] Optionally, the first sub-shell has a positioning protrusion arranged in an annular shape on the side near the second sub-shell, and the second sub-shell has a positioning groove arranged in an annular shape corresponding to the positioning protrusion. One end of the positioning protrusion is provided with a second guide slope, which is used to guide the positioning protrusion into the positioning groove.

[0014] Compared to existing technologies, the high-sealing twin-screw pump of this invention has a simple structure and low production cost. The sealing mechanism enhances the seal between the first and second housings, preventing liquid leakage and ensuring safe and reliable operation. The sealing mechanism includes a sealing sleeve located outside the stud, with its outer wall abutting against the inner wall of the mounting groove, further improving sealing performance. A first guide bevel is annularly positioned at one end of the sealing sleeve, guiding it into the mounting groove and reducing assembly difficulty. The first and second gaskets prevent bolt loosening; both are made of polytetrafluoroethylene (PTFE), which has excellent sealing properties, further enhancing the sealing performance. Attached Figure Description

[0015] Figure 1 This is a perspective view of the high-sealing twin-screw pump of this utility model;

[0016] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0017] Figure 3 This is a cross-sectional view of the high-sealing twin-screw pump of this utility model;

[0018] Figure 4 for Figure 3 Enlarged view of section B;

[0019] The component names corresponding to the various reference numerals in the figure are as follows: 1 is the driving screw, 2 is the first sub-shell, 21 is the first protrusion, 22 is the first flange, 23 is the positioning protrusion, 231 is the second guide slope, 3 is the second sub-shell, 31 is the second protrusion, 32 is the second flange, 33 is the positioning groove, 4 is the bolt, 401 is the inner wall, 402 is the stud, 403 is the bolt head, 51 is the sealing ring, 52 is the sealing sleeve, 521 is the first guide slope, 6 is the nut, 71 is the first washer, 72 is the second washer, 8 is the motor, 11 is the threaded head, and 12 is the connecting rod. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] In the description of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship when the product is in normal use.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0023] See Figures 1-4 This utility model provides a high-sealing twin-screw pump, including a housing and a screw disposed within the housing. The housing includes a first sub-housing 2 and a second sub-housing 3 joined together, connected by a bolt 4. A sealing mechanism is provided between the first sub-housing 2 and the second sub-housing 3, including a sheet-like sealing ring 51 made of rubber or silicone. The sealing ring 51 abuts against the first sub-housing 2 and the second sub-housing 3. A first protrusion 21 is provided on the side of the first sub-housing 2 near the sealing ring 51, and a second protrusion 31 is provided on the side of the second sub-housing 3 near the sealing ring 51. Both the first protrusion 21 and the second protrusion 31 abut against the sealing ring 51. Multiple first protrusions 21 and second protrusions 31 are provided. The two protrusions 31 are staggered, increasing the contact area with the sealing ring 51 and compressing it to improve sealing performance. The staggered arrangement of the first protrusion 21 and the second protrusion 31 further enhances the sealing effect. Bolts 4 sequentially pass through the first sub-shell 2, the sealing ring 51, and the second sub-shell 3, locking them together. The tightening force of the bolts 4 presses the sealing ring 51 against the joint between the first sub-shell 2 and the second sub-shell 3, improving sealing performance and preventing leakage at the joint. This invention has a simple structure and low production cost. The sealing mechanism increases the seal between the first and second sub-shells, preventing liquid leakage and ensuring safe and reliable use.

[0024] See Figure 1 , Figure 2 and Figure 4The first sub-shell 2, the sealing ring 51, and the second sub-shell 3 are all provided with mounting slots for mounting bolts 4. Bolts 4 include studs 402. The sealing mechanism also includes a sealing sleeve 52 disposed on the outside of the stud 402. The outer wall of the sealing sleeve 52 abuts against the inner wall 401 of the mounting slot, further improving the sealing performance. When the stud 402 is not installed, the outer diameter of the sealing sleeve 52 is slightly larger than the inner diameter of the mounting slot, so that after the stud 402 is installed, the sealing sleeve 52 is slightly squeezed by the inner wall 401 and abuts against the inner wall 401 to seal. The first protrusion 21 and the second protrusion 31 are both arc-shaped protrusions. The first protrusion 21 and the second protrusion 31 are relatively rounded in shape, making it less likely to puncture the sealing ring 51 when it is squeezed. In this embodiment, the cross-sections of the first protrusion 21 and the second protrusion 31 are both semi-circular. One end of the sealing sleeve 52 is provided with a first guide slope 521, which is used to guide the sealing sleeve 52 into the installation groove, reducing the assembly difficulty. The sealing sleeve 52 is made of rubber and is formed on the outside of the stud 402 by injection molding. The manufacturing cost of the rubber molding process is relatively low. The sealing sleeve 52 can also be made of other materials with sealing properties and suitable for the rubber molding process.

[0025] See Figures 1-3 The first sub-shell 2 has a first flange 22 arranged in an annular shape, and the second sub-shell 3 has a second flange 32 arranged in an annular shape corresponding to the first flange 22. The sealing ring 51 abuts between the first flange 22 and the second flange 32. The bolt 4 passes through the first flange 22, the sealing ring 51 and the second flange 32 in sequence. The first flange 22 and the second flange 32 are locked by the bolt 4, thereby locking the first sub-shell 2 and the second sub-shell 3. The structure is reasonably designed. In this embodiment, the first flange 22 and the second flange 32 are locked together by multiple bolts 4. One end of the bolt 4 is threaded with a nut 6. The first sub-shell 2 and the second sub-shell 3 are locked and fixed by the bolt 4 and the nut 6. The locking force between the first sub-shell 2 and the second sub-shell 3 makes the sealing ring 51 abut against the first sub-shell 2 and the second sub-shell 3, thereby improving the sealing performance.

[0026] See Figures 2-4 The nut 6 abuts against the second housing 3 with a first washer 71; the bolt 4 also includes a bolt head 403, and the bolt head 403 abuts against the first housing 2 with a second washer 72. The first washer 71 and the second washer 72 can prevent the bolt 4 from loosening; the first washer 71 and the second washer 72 are both made of polytetrafluoroethylene (PTFE). PTFE has good sealing performance, which allows the first washer 71 and the second washer 72 to also have a sealing effect, further improving the sealing performance.

[0027] See Figure 3 and Figure 4The first sub-shell 2 has a positioning protrusion 23 arranged in a ring on the side near the second sub-shell 3. The second sub-shell 3 has a positioning groove 33 arranged in a ring on the side corresponding to the positioning protrusion 23. The positioning protrusion 23 and the positioning groove 33 cooperate to ensure that the first sub-shell 2 and the second sub-shell 3 are accurately assembled and are not prone to relative displacement after assembly. If the first sub-shell 2 and the second sub-shell 3 are relatively displaced, leakage is likely to occur. One end of the positioning protrusion 23 is provided with a second guide slope 231, which is used to guide the positioning protrusion 23 into the positioning groove. Within the slot 33, the assembly difficulty of the first sub-shell 2 and the second sub-shell 3 is reduced; one end of the sealing ring 51 abuts against the positioning protrusion 23 for limiting, making the sealing ring 51 less prone to displacement and ensuring stable sealing performance; the outer shell is connected to the motor 8, and the screw includes a meshing active screw 1 and a driven screw. The active screw 1 includes a threaded head 11 and a connecting rod 12. The threaded head 11 is placed inside the first sub-shell 2, and the connecting rod 12 passes through the second sub-shell 3. One end of the connecting rod 12 is integrally connected to the threaded head 11, and the other end of the connecting rod 12 is connected to the output end of the motor 8.

[0028] The high-sealing twin-screw pump of this invention has a simple structure and low production cost. The sealing mechanism enhances the seal between the first and second housings, preventing liquid leakage and ensuring safe and reliable operation. The sealing mechanism includes a sealing sleeve located outside the stud, with its outer wall abutting against the inner wall of the mounting groove, further improving sealing performance. A first guide bevel is annularly positioned at one end of the sealing sleeve, guiding it into the mounting groove and reducing assembly difficulty. A first gasket and a second gasket prevent bolt loosening. Both gaskets are made of polytetrafluoroethylene (PTFE), which has excellent sealing properties, further enhancing the sealing performance.

[0029] In the description of this disclosure, it should be understood that the terms "upper", "lower", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0030] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0032] In this disclosure, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first feature or in indirect contact with the first feature through an intermediate medium.

[0033] It should be noted that when a component is described as being "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is described as "connected to another component," it can be directly connected to the other component or there may be an intervening component. Furthermore, when a component is described as being "fixedly connected" to another component, the connection can be detachable or non-detachable, such as through socketing, snap-fitting, integral molding, welding, etc., which are achievable in conventional technologies and will not be elaborated upon here.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A high-sealing twin-screw pump, comprising a housing and a screw disposed within the housing, the housing comprising a first sub-housing (2) and a second sub-housing (3) joined together, characterized in that, A bolt (4) is connected between the first sub-shell (2) and the second sub-shell (3). A sealing mechanism is provided between the first sub-shell (2) and the second sub-shell (3). The sealing mechanism includes a sheet-shaped sealing ring (51). The sealing ring (51) abuts against the first sub-shell (2) and the second sub-shell (3). A first protrusion (21) is provided on the side of the first sub-shell (2) near the sealing ring (51). A second protrusion (31) is provided on the side of the second sub-shell (3) near the sealing ring (51). Both the first protrusion (21) and the second protrusion (31) abut against the sealing ring (51). There are multiple first protrusions (21) and second protrusions (31). The first protrusions (21) and the second protrusions (31) are arranged alternately. The bolt (4) passes through the first sub-shell (2), the sealing ring (51) and the second sub-shell (3) in sequence.

2. The high-sealing twin-screw pump according to claim 1, characterized in that, The first sub-shell (2), the sealing ring (51) and the second sub-shell (3) are all provided with mounting grooves for mounting the bolt (4). The bolt (4) includes a stud (402). The sealing mechanism also includes a sealing sleeve (52) disposed outside the stud (402). The outer wall of the sealing sleeve (52) abuts against the inner wall (401) of the mounting groove. The first protrusion (21) and the second protrusion (31) are both arc-shaped protrusions.

3. The high-sealing twin-screw pump according to claim 2, characterized in that, One end of the sealing sleeve (52) is provided with a first guide slope (521) in an annular shape, which is used to guide the sealing sleeve (52) into the mounting groove.

4. The high-sealing twin-screw pump according to claim 2, characterized in that, The sealing sleeve (52) is made of rubber and is formed on the outside of the stud (402) by injection molding.

5. The high-sealing twin-screw pump according to claim 1, characterized in that, The first sub-shell (2) is provided with a first flange (22) in an annular shape, and the second sub-shell (3) is provided with a second flange (32) corresponding to the first flange (22) in an annular shape. The sealing ring (51) abuts between the first flange (22) and the second flange (32). The bolt (4) passes through the first flange (22), the sealing ring (51) and the second flange (32) in sequence.

6. The high-sealing twin-screw pump according to claim 1, characterized in that, One end of the bolt (4) is threaded with a nut (6). The first sub-shell (2) and the second sub-shell (3) are locked and fixed by the bolt (4) and the nut (6). The sealing ring (51) is pressed against the first sub-shell (2) and the second sub-shell (3) by the locking force between the first sub-shell (2) and the second sub-shell (3).

7. The high-sealing twin-screw pump according to claim 6, characterized in that, A first gasket (71) abuts against the nut (6) and the second sub-shell (3).

8. The high-sealing twin-screw pump according to claim 7, characterized in that, The bolt (4) also includes a bolt head (403), and a second gasket (72) abuts against the first sub-shell (2).

9. The high-sealing twin-screw pump according to claim 8, characterized in that, Both the first gasket (71) and the second gasket (72) are made of polytetrafluoroethylene.

10. The high-sealing twin-screw pump according to any one of claims 1-9, characterized in that, The first sub-shell (2) has a positioning protrusion (23) arranged in an annular shape on one side near the second sub-shell (3). The second sub-shell (3) has a positioning groove (33) arranged in an annular shape corresponding to the positioning protrusion (23). One end of the positioning protrusion (23) is provided with a second guide slope (231), which is used to guide the positioning protrusion (23) into the positioning groove (33).

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