Double-valve-element plug valve

Abstract

The utility model relates to the technical field of plug valves, in particular to a double-spool plug valve which comprises a valve body, a main spool, an auxiliary spool and a driving mechanism, the valve body is provided with a water inlet and a water outlet, a first mounting groove is further formed in the valve body, the main spool is rotatably arranged in the first mounting groove, and the auxiliary spool is rotatably arranged in the second mounting groove. The peripheral face of the main valve element abuts against the inner wall of the first mounting groove to form sealing, openings are formed in the main valve element and the auxiliary valve element, a second mounting groove and a through hole are formed in the main valve element, the through hole communicates with the second mounting groove, the auxiliary valve element is rotationally arranged in the second mounting groove, and the auxiliary valve element abuts against the inner wall of the second mounting groove to form sealing. The driving mechanism is arranged on the valve body and used for driving the main valve element and the auxiliary valve element to rotate to open and close the valve. According to the utility model, the pressure on the two sides of the main valve core can be balanced before the main valve core is rotated, so that the valve can be opened more easily.

Description

Technical Field

[0001] This application relates to the field of plug valve technology, and more particularly to a dual-core plug valve. Background Technology

[0002] A plug valve is a rotary valve with a plunger-shaped closing element. It is opened or closed by rotating 90 degrees to connect or separate the passage on the plug from the passage on the valve body. The plug can be cylindrical or conical.

[0003] For some existing plug valves, when used in high-pressure fluid conditions, after the valve core is closed by rotating it, there will be a large pressure difference on both sides of the valve core. The high-pressure liquid on the inlet side will press the other side of the valve core against the valve body or valve seat, resulting in increased friction between the valve core and the valve body or valve seat. This may cause the valve core to be difficult to rotate when the valve needs to be opened. Utility Model Content

[0004] This application provides a dual-core plug valve, which can improve the technical problem of valves being difficult to open under high-pressure conditions in the prior art.

[0005] This application provides a dual-valve-core plug valve, including a valve body, a main valve core, a secondary valve core, and a drive mechanism. The valve body has an inlet and an outlet, and a first mounting groove is also provided inside the valve body. The main valve core is rotatably disposed inside the first mounting groove, and the outer circumferential surface of the main valve core abuts against the inner wall of the first mounting groove to form a seal. Both the main valve core and the secondary valve core have openings. The main valve core has a second mounting groove and a through hole, and the through hole communicates with the second mounting groove. The secondary valve core is rotatably disposed inside the second mounting groove, and the secondary valve core abuts against the inner wall of the second mounting groove to form a seal. The drive mechanism is disposed on the valve body and is used to drive the main valve core and the secondary valve core to rotate, thereby opening and closing the valve.

[0006] The technical solution described above in this application embodiment has at least the following technical effects: The through hole passes through the main valve core and can directly connect the inlet and outlet. In the initial state, the main valve core cuts off the inlet and outlet, and the auxiliary valve core cuts off the through hole, so the valve is in a closed state. When the valve needs to be opened, the auxiliary valve core is rotated first by the drive mechanism. The auxiliary valve core rotates relative to the main valve core inside the second mounting groove. After the auxiliary valve core is rotated at a certain angle, the opening on the auxiliary valve core connects with the through hole. The high-pressure liquid inside the inlet flows into the inlet through the through hole and the opening on the auxiliary valve core, gradually balancing the pressure on both sides of the main valve core. Then, the drive mechanism rotates the main valve core and the auxiliary valve core simultaneously to connect the inlet and outlet through the opening on the main valve core, so that the valve can be opened. When closing the valve, the drive mechanism drives the auxiliary valve core to reverse back to its original position relative to the main valve core, and then drives the main valve core and the auxiliary valve core to reverse back to their initial position. Since the pressure on both sides of the main valve core is balanced before rotating it, the valve can be opened more easily.

[0007] The dual-valve-core plug valve provided in this application embodiment can balance the pressure on both sides of the main valve core before rotating it, making the valve easier to open.

[0008] In some embodiments, the drive mechanism includes a valve stem, a connecting assembly, and a transmission assembly. The valve stem is rotatably mounted on the valve body. One end of the valve stem is located outside the valve body, and the other end is connected to the side of the auxiliary valve core away from the main valve core via the connecting assembly. The transmission assembly is used to transmit the power of the auxiliary valve core when it rotates to drive the main valve core to rotate.

[0009] In some embodiments, the connecting assembly includes a connecting plate bolted to the side of the secondary valve core away from the main valve core, and the end of the valve stem located inside the valve body is fixedly connected to the side of the connecting plate away from the secondary valve core.

[0010] In some embodiments, the transmission assembly includes a pair of first abutment blocks and a pair of second abutment blocks symmetrically arranged relative to the valve stem axis. The first abutment blocks are all fixedly connected to the main valve core, and the second abutment blocks are all fixedly connected to the side of the connecting plate. One end of each of the two first abutment blocks abuts against one end of each of the two second abutment blocks.

[0011] In some embodiments, the valve body is further provided with an installation port, and a valve cover is bolted to the valve body to seal the installation port. The valve stem passes through the valve cover and is rotatably connected to the valve cover.

[0012] In some embodiments, the valve stem has an abutment portion that abuts against the side of the valve cover near the main valve core. Attached Figure Description

[0013] Figure 1A schematic diagram of the overall structure of a dual-core plug valve provided in an embodiment of this application;

[0014] Figure 2 A cross-sectional view of a dual-core plug valve provided in an embodiment of this application;

[0015] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0016] Figure 4 A schematic diagram of the connection structure between the main valve core and the drive mechanism.

[0017] The following are the labeling elements in the figure:

[0018] 1. Valve body; 11. Inlet; 12. Outlet; 13. First mounting groove; 14. Mounting port; 15. Valve cover; 2. Main valve core; 21. Opening; 22. Second mounting groove; 23. Through hole; 3. Secondary valve core; 4. Valve stem; 41. Abutment part; 5. Connecting plate; 61. First abutment block; 62. Second abutment block. Detailed Implementation

[0019] Based on this, in order to improve the technical problem of valves being difficult to open under high pressure conditions in the prior art, the embodiments of this application provide the following solutions.

[0020] The following combination Figures 1-4 The present invention will be described in further detail below.

[0021] This embodiment discloses a dual-core plug valve, comprising a valve body 1, a main valve core 2, a secondary valve core 3, and a drive mechanism. The valve body 1 has an inlet 11 and an outlet 12. The valve body 1 also has a first mounting groove 13. The main valve core 2 is rotatably disposed inside the first mounting groove 13. The outer circumferential surface of the main valve core 2 abuts against the inner wall of the first mounting groove 13 to form a seal. Both the main valve core 2 and the secondary valve core 3 have openings 21. The main valve core 2 has a second mounting groove 22 and a through hole 23. The through hole 23 communicates with the second mounting groove 22. The secondary valve core 3 is rotatably disposed inside the second mounting groove 22. The secondary valve core 3 abuts against the inner wall of the second mounting groove 22 to form a seal. The drive mechanism is disposed on the valve body 1 and is used to drive the main valve core 2 and the secondary valve core 3 to rotate to open and close the valve.

[0022] As can be seen from the above, the dual-valve-core plug valve provided in this application embodiment has a through hole 23 passing through the main valve core 2, which can directly connect the inlet 11 and the outlet 12. In the initial state, the main valve core 2 cuts off the inlet 11 and the outlet 12, and the auxiliary valve core 3 cuts off the through hole 23, so the valve is in the closed state. When the valve needs to be opened, the auxiliary valve core 3 is rotated first by the drive mechanism. The auxiliary valve core 3 rotates relative to the main valve core 2 inside the second mounting groove 22. After the auxiliary valve core 3 is rotated by a certain angle, the opening 21 on the auxiliary valve core 3 connects with the through hole 23, and the high-pressure liquid inside the inlet 11 passes through the through hole. Water flows into the inlet 11 through the opening 21 on the auxiliary valve core 3, gradually balancing the pressure on both sides of the main valve core 2. Then, the driving mechanism simultaneously rotates the main valve core 2 and the auxiliary valve core 3, connecting the inlet 11 and the outlet 12 through the opening 21 on the main valve core 2, thus opening the valve. To close the valve, the driving mechanism first drives the auxiliary valve core 3 to reverse relative to the main valve core 2 back to its original position, then simultaneously drives the main valve core 2 and the auxiliary valve core 3 to reverse, returning the main valve core 2 to its initial position. Because the pressure on both sides of the main valve core 2 is balanced before rotation, opening the valve is easier.

[0023] In some embodiments, please refer to the following: Figures 2 to 4 The drive mechanism includes a valve stem 4, a connecting assembly, and a transmission assembly. The valve stem 4 is rotatably mounted on the valve body 1. One end of the valve stem 4 is located outside the valve body 1, and the other end is connected to the side of the auxiliary valve core 3 away from the main valve core 2 through the connecting assembly. The transmission assembly is used to transmit the power of the auxiliary valve core 3 when it rotates to drive the main valve core 2 to rotate.

[0024] With this setup, when the valve needs to be opened, rotate the valve stem 4 at one end outside the valve body 1. The valve stem 4 drives the auxiliary valve core 3 to rotate 90 degrees relative to the main valve core 2 inside the second mounting groove 22 via the connecting assembly. At this time, the opening 21 on the auxiliary valve core 3 is directly opposite the through hole 23. Then, continue to rotate the valve stem 4. The valve stem 4 drives the auxiliary valve core 3 to rotate. At the same time, the auxiliary valve core 3 drives the main valve core 2 to rotate via the transmission assembly. After the valve stem 4 rotates 90 degrees again, the opening 21 on the main valve core 2 is directly opposite the inlet 11 and the outlet 12, and the valve is opened.

[0025] Optionally, in some embodiments, please refer to Figures 2 to 4 The connecting assembly includes a connecting plate 5, which is bolted to the side of the secondary valve core 3 away from the main valve core 2. The end of the valve stem 4 located inside the valve body 1 is fixedly connected to the side of the connecting plate 5 away from the secondary valve core 3.

[0026] With this configuration, when the valve stem 4 rotates, it can drive the auxiliary valve core 3 to rotate through the connecting plate 5. After the auxiliary valve core 3 is damaged and cannot be used normally, the auxiliary valve core 3 can be removed from the connecting plate 5, and then a new auxiliary valve core 3 can be installed back on the connecting plate 5. Replacing the auxiliary valve core 3 can improve the service life of the valve.

[0027] Optionally, please refer to Figures 2 to 4 The transmission assembly includes a pair of first abutment blocks 61 and a pair of second abutment blocks 62 arranged symmetrically relative to the valve stem 4. The first abutment blocks 61 are fixedly connected to the main valve core 2, and the second abutment blocks 62 are fixedly connected to the side of the connecting plate 5. One end of the two first abutment blocks 61 abuts against one end of the two second abutment blocks 62 respectively.

[0028] With this configuration, both the first abutment block 61 and the second abutment block 62 are partially circular rings with an angle of 45 degrees. Initially, one end of the second abutment block 62 abuts against one end of a first abutment block 61, and the other end of this second abutment block 62 is at a 90-degree angle to the other first abutment block 61. The other second abutment block 62 is similarly positioned. When the valve stem 4 is rotated, causing the connecting plate 5 to rotate, the main valve core 2 and the first abutment block 61 remain stationary, while the second abutment block 62 rotates and separates from the first abutment block 61. After rotating 90 degrees, both second abutment blocks 62... The valve stem 61 abuts against another first abutting block 61, and then the connecting plate 5 continues to rotate, which synchronously drives the first abutting block 61 and the main valve stem 4 to rotate through the second abutting block 62. After rotating 90 degrees again, the valve opens. Similarly, when the valve needs to be closed, the valve stem 4 is rotated 90 degrees in the opposite direction, and the second abutting block 62 rotates 90 degrees in the opposite direction to abut against another first abutting block 61. During this process, the first abutting block 61 does not move, and the valve stem 4 continues to rotate 90 degrees in the opposite direction. The second abutting block 62 drives the main valve core 2 to rotate 90 degrees in the opposite direction through the first abutting block 61, and the valve closes and returns to the initial state.

[0029] In some embodiments, please refer to Figure 1 and Figure 2 The valve body 1 is also provided with an installation port 14. A valve cover 15 is bolted to the valve body 1 to seal the installation port 14. The valve stem 4 passes through the valve cover 15 and is rotatably connected to the valve cover 15.

[0030] With this configuration, when assembling the valve, the main valve core 2 and the auxiliary valve core 3 can be placed inside the valve body 1 through the mounting port 14. When it is necessary to inspect the inside of the valve, the valve cover 15 can be removed and the operation can be carried out through the mounting port 14.

[0031] Optionally, in some embodiments, please refer to Figure 2 The valve stem 4 has an abutment part 41, which abuts against the side of the valve cover 15 near the main valve core 2.

[0032] With this configuration, when assembling the valve, first assemble the valve stem 4, the auxiliary valve core 3, and the main valve core 2. Then, install the valve cover 15 onto the valve body 1 and pass the valve stem 4 through the valve cover 15. Then, connect the valve cover 15 to the valve body 1 with bolts. The valve cover 15 can press the valve stem 4 downward through the abutment part 41. The valve stem 4 can press the auxiliary valve core 3 into the second mounting groove 22, which can enhance the sealing between the auxiliary valve core 3 and the main valve core 2.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual-core plug valve, characterized in that: The valve includes a valve body (1), a main valve core (2), a secondary valve core (3), and a drive mechanism. The valve body (1) has an inlet (11) and an outlet (12). The valve body (1) also has a first mounting groove (13) inside. The main valve core (2) is rotatably disposed inside the first mounting groove (13). The outer circumferential surface of the main valve core (2) abuts against the inner wall of the first mounting groove (13) to form a seal. Both the main valve core (2) and the secondary valve core (3) have... An opening (21) is provided. The main valve core (2) is provided with a second mounting groove (22) and a through hole (23). The through hole (23) is connected to the second mounting groove (22). The auxiliary valve core (3) is rotatably disposed inside the second mounting groove (22). The auxiliary valve core (3) abuts against the inner wall of the second mounting groove (22) to form a seal. The driving mechanism is disposed on the valve body (1) and is used to drive the main valve core (2) and the auxiliary valve core (3) to rotate so that the valve can be opened and closed.

2. The dual-core plug valve according to claim 1, characterized in that: The driving mechanism includes a valve stem (4), a connecting assembly, and a transmission assembly. The valve stem (4) is rotatably mounted on the valve body (1). One end of the valve stem (4) is located outside the valve body (1), and the other end is connected to the side of the auxiliary valve core (3) away from the main valve core (2) through the connecting assembly. The transmission assembly is used to transmit the power of the auxiliary valve core (3) when it rotates to drive the main valve core (2) to rotate.

3. A dual-core plug valve according to claim 2, characterized in that: The connecting assembly includes a connecting plate (5), which is bolted to the side of the secondary valve core (3) away from the main valve core (2), and the valve stem (4) located inside the valve body (1) is fixedly connected to the side of the connecting plate (5) away from the secondary valve core (3).

4. A dual-core plug valve according to claim 3, characterized in that: The transmission assembly includes a pair of first abutment blocks (61) and a pair of second abutment blocks (62) symmetrically arranged relative to the valve stem (4). The first abutment blocks (61) are fixedly connected to the main valve core (2), and the second abutment blocks (62) are fixedly connected to the side of the connecting plate (5). One end of each of the two first abutment blocks (61) abuts against one end of each of the two second abutment blocks (62).

5. A dual-core plug valve according to claim 2, characterized in that: The valve body (1) is also provided with an installation port (14), and a valve cover (15) is bolted to the valve body (1) to block the installation port (14). The valve stem (4) passes through the valve cover (15) and is rotatably connected to the valve cover (15).

6. A dual-core plug valve according to claim 5, characterized in that: The valve stem (4) has an abutment part (41) which abuts against the side of the valve cover (15) near the main valve core (2).

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