Flow adjustable shutoff valve connecting transformer to photoacoustic spectrometer

Abstract

The application provides a flow-adjustable shutoff valve connecting a transformer and a photoacoustic spectrometer, which comprises a valve core and a sleeve driving assembly. The valve core is provided with a channel penetrating along the axial direction of the valve core, and the channel is used for conveying liquid to be conveyed. The sleeve driving assembly comprises a connector, a ball and a sealing gland. The connector is used for connecting the transformer, and the connector is internally provided with a first accommodating space for communicating with an oil passage of the transformer. The ball is clamped between the connector and the valve core and is movably arranged relative to the connector and the valve core and the gap is adjustable. The first accommodating space is used for accommodating the ball and the end part of the valve core and the ball which can be separated and abutted. The sealing gland is screw-connected with the connector, the sealing gland is sleeved on the outer periphery of the valve core and is drivingly connected with the valve core, is used for rotating the sealing gland to drive the valve core and the ball to abut or separate, and is used for adjusting the liquid flow from the first accommodating space into the channel.

Description

Technical Field

[0001] This application relates to the field of fluid transport and control, and in particular to a flow-adjustable shut-off valve that connects a transformer and a photoacoustic spectrometer. Background Technology

[0002] In the field of power systems and testing equipment, transformers, as key equipment for power transmission and distribution, require rigorous monitoring of their operational status. Photoacoustic spectrometers, as advanced testing devices, can analyze the composition of liquids within transformers to determine their operating condition. With the continuous development of power systems and increasing demands for equipment operational stability, achieving a stable and reliable connection between transformers and photoacoustic spectrometers, as well as facilitating liquid transport, has become an important research direction in this field.

[0003] Currently, to connect transformers and testing equipment and transport liquids, conventional piping connections are commonly used. One common method is to use a simple straight-through pipe to directly connect the transformer and the photoacoustic spectrometer, relying on the liquid's own pressure or a simple external pump to drive the flow. Another method is to use a pipe connection with a gate valve, where the liquid flow is controlled manually. In some cases, more complex piping systems with multiple valves and fittings are used to achieve more precise liquid transport control, but this method often requires a more complex installation and commissioning process.

[0004] These existing methods have significant drawbacks. Ordinary straight-through pipes cannot effectively regulate and control liquid flow, making it difficult to meet the precise liquid delivery requirements of different testing needs. Gate valves, on the other hand, are prone to leaks during long-term use, leading to not only inaccurate test results but also potential equipment damage. While complex piping systems can achieve more precise control to some extent, they are structurally complex, have high installation and maintenance costs, are prone to failure, and have lower reliability. Utility Model Content

[0005] To address the problems in the prior art, this application provides a flow-adjustable shut-off valve that connects a transformer to a photoacoustic spectrometer.

[0006] This application provides a flow-adjustable shut-off valve for connecting a transformer and a photoacoustic spectrometer, including a valve core and a sleeve-driven assembly. The valve core has a channel extending along its axis for conveying a liquid to be conveyed. The sleeve-driven assembly includes a connector, balls, and a sealing cap. The connector connects to the transformer and has a first accommodating space inside for connecting an oil passage to the transformer. The balls are sandwiched between the connector and the valve core, movably positioned relative to both with an adjustable gap. The first accommodating space accommodates the balls and the separable abutting ends of the valve core and the balls. The sealing cap is screwed to the connector, sleeved on the outer circumference of the valve core, and driven by the valve core. Rotating the sealing cap causes the valve core to abut or separate from the balls, and also regulates the flow rate of the liquid entering the channel from the first accommodating space.

[0007] Understandably, the connector is fixedly connected to the transformer. The first accommodating space inside the connector is used to connect the transformer's insulating oil pipeline. This space also accommodates the ball bearings and the valve core, with a separable abutment point between the ball bearings and the valve core. The ball bearings are sandwiched between the connector and the valve core with an adjustable gap. The sealing gland is screw-connected to the connector and driven by the valve core. When the sealing gland is rotated away from the connector, it causes the valve core to separate from the ball bearings, which in turn separates the ball bearings from the connector, increasing the flow rate of insulating oil into the first accommodating space. When the sealing gland is rotated towards the connector, it causes the valve core to abut against the ball bearings, which in turn abuts against the connector, decreasing the flow rate of insulating oil into the first accommodating space. Rotating the sealing gland adjusts the flow rate of insulating oil between the connector and the ball bearings.

[0008] In one embodiment, the first receiving space includes a connecting area, a chamfered area, and a receiving area arranged sequentially. The connecting area is used to connect the oil circuit of the transformer, the receiving area is used to receive the end of the valve core, the chamfered area is used to connect the connecting area and the receiving area, and the inner diameter of the chamfered area gradually increases from the side where the connecting area is located toward the side where the receiving area is located. The joint is used to surround the inner wall of the chamfered structure and is used to detachably abut against the ball.

[0009] Understandably, the connection area connects to the transformer's insulating oil pipeline, allowing the insulating oil inside the transformer to flow smoothly into the first receiving space. The receiving area ensures the stability of the relative position of the valve core and the connector. The chamfered area makes the flow of insulating oil from the connection area into the receiving area smoother, reducing the resistance to the flow of insulating oil. When the rotating sealing gland causes the valve core to contact or separate from the ball bearing, the flow rate of insulating oil entering the channel from the first receiving space can be adjusted through the cooperation of the ball bearing and the inclined inner wall.

[0010] In one embodiment, the valve core has several holes on its outer peripheral surface near the connector, and these holes communicate with the channel.

[0011] Understandably, the holes allow insulating oil to enter the channel through the openings on the outer circumference, increasing the pathways for the insulating oil to enter the channel. Compared to entering the channel only from the ends, this improves the efficiency of insulating oil entering the channel.

[0012] In one embodiment, a slot is provided on the outer peripheral surface of the sealing gland away from the connector, the slot being used to allow the sealing gland to be clamped and driven to rotate.

[0013] Understandably, a slot is made on the outer circumference of the sealing gland away from the joint to facilitate clamping the slot with tools, thereby driving the sealing gland to rotate. The rotation of the sealing gland causes the valve core to abut or separate from the ball bearing, facilitating the adjustment of the insulating oil flow rate into the first receiving space.

[0014] In one embodiment, the sleeve drive assembly further includes a first sealing ring and a second sealing ring, the first sealing ring being disposed on the contact surface between the connector and the valve core, and the second sealing ring being disposed on the contact surface between the connector and the sealing gland.

[0015] Understandably, the first sealing ring prevents insulating oil from leaking outwards from the contact surface between the connector and the valve core, ensuring the sealing of the connection between the valve core and the connector. The second sealing ring prevents insulating oil from leaking outwards from the contact surface between the connector and the sealing gland, further enhancing the sealing performance of the entire sleeve drive assembly. The cooperation of the first and second sealing rings prevents leakage of insulating oil during transport, improving the reliability and stability of the shut-off valve.

[0016] In one embodiment, the sleeve drive assembly further includes a clamping screw cap, which is sleeved on the outer peripheral surface of the valve core and located at the end of the sealing cover away from the joint, and is in tight engagement with the sealing cover.

[0017] Understandably, the tightening cap is used to prevent the sealing gland and valve core from loosening, ensuring the stability of the spiral connection between the sealing gland and the connector, and thus ensuring the stability of the sealing gland's drive process for the valve core.

[0018] In one embodiment, the sleeve drive assembly further includes an elastic sealing gasket disposed between the clamping screw cap and the sealing gland.

[0019] Understandably, the elastic sealing gasket is partially located on the contact surface between the compression nut and the valve core, extending beyond the contact surface. The compression nut further improves the sealing performance and prevents gas leakage by compressing the elastic sealing gasket that extends beyond the contact surface between the compression nut and the valve core.

[0020] In one embodiment, a two-way ball valve is also included, with the other end of the valve core away from the ball located outside the sleeve drive assembly and communicating with the two-way ball valve. The two-way ball valve is also used to communicate with a photoacoustic spectrometer.

[0021] In one embodiment, the two-way ball valve further includes a valve body, a ball, and a valve stem. The valve body has a communicating second receiving space and a first through hole inside. The ball is rotatably disposed in the second receiving space, and the ball has the second through hole. The valve stem passes through the first through hole and is connected to the top of the ball. The valve stem is used to drive the ball to rotate, so that the second through hole is connected to or disconnected from the channel.

[0022] Understandably, a two-way ball valve can effectively control the flow of insulating oil from the transformer to the photoacoustic spectrometer through the valve core channel. The valve stem drives the ball to rotate, connecting or disconnecting the second through hole from the channel. This configuration improves the controllability and stability of the entire system, while also facilitating system maintenance and repair.

[0023] In one embodiment, the two-way ball valve further includes a plurality of gaskets disposed in a second receiving space between the ball and the valve body.

[0024] Understandably, multiple gaskets enhance the seal between the ball and the valve body, preventing insulating oil from leaking out of the second containment space between the ball and the valve body, thus ensuring the normal operation of the shut-off valve and the stability of the insulating oil delivery. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the flow-adjustable shut-off valve connecting the transformer and the photoacoustic spectrometer provided in the embodiments of this application.

[0026] Figure 2 This is a plan view of the flow-adjustable shut-off valve connecting the transformer and the photoacoustic spectrometer provided in the embodiments of this application.

[0027] Figure 3 This is a cross-sectional view of the flow-adjustable shut-off valve connecting the transformer and the photoacoustic spectrometer provided in the embodiments of this application.

[0028] Figure 4 yes Figure 3 Enlarged structural diagram at point A in the middle.

[0029] Explanation of reference numerals in the attached drawings: 1. Valve core; 11. Channel; 12. Hole; 2. Sleeve drive assembly; 21. Connector; 211. First receiving space; 2111. Connection area; 2112. Chamfered area; 2113. Receiving area; 212. Inner wall; 22. Ball; 23. Sealing gland; 231. Groove; 24. First sealing ring; 25. Second sealing ring; 26. Compression screw cap; 27. Elastic sealing gasket; 3. Two-way ball valve; 31. Valve body; 311. Second receiving space; 312. First through hole; 32. Ball; 321. Second through hole; 33. Valve stem; 34. Gasket. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail below.

[0031] The technical solutions in the embodiments of this application will be further described in detail below with reference to the accompanying drawings. The described embodiments are only possible technical implementations of this application, but are not limited thereto. Other embodiments obtained by those skilled in the art in conjunction with the embodiments of this application without creative effort are also within the protection scope of this application.

[0032] This application discloses a flow-adjustable shut-off valve connecting a transformer and a photoacoustic spectrometer. (Refer to...) Figure 1 The flow-adjustable shut-off valve connecting the transformer and the photoacoustic spectrometer includes a valve core 1 and a sleeve drive assembly 2. The valve core 1 has a channel 11 extending along its axis, used to transport the liquid to be transported. The sleeve drive assembly 2 includes a connector 21, balls 22, and a sealing cap 23. The connector 21 connects to the transformer, and its interior has a first receiving space 211 for connecting the transformer's oil passage. The balls 22 are sandwiched between the connector 21 and the valve core 1, movably positioned relative to both with an adjustable gap. The first receiving space 211 accommodates the balls 22 and the separable abutting ends of the valve core 1 and the balls 22. The sealing cap 23 is screwed to the connector 21, sleeved on the outer circumference of the valve core 1, and driven by the valve core 1. Rotating the sealing cap 23 causes the valve core 1 to abut or separate from the balls 22, and also regulates the flow rate of the liquid entering the channel 11 from the first receiving space 211.

[0033] In this embodiment, when it is necessary to transport insulating oil from the transformer, rotating the sealing cap 23 separates the valve core 1 and the ball bearing 22 located inside the first receiving space 211. Under the pressure of the insulating oil, an insulating oil passage is formed between the ball bearing 22 and the connector 21, and the insulating oil enters the channel 11 through the passage. The flow rate of the insulating oil can be adjusted by rotating the sealing cap 23, thereby enabling the transport of insulating oil with different flow rates as needed. When it is not necessary to transport insulating oil from the transformer, rotating the sealing cap 23 causes the valve core 1 and the ball bearing 22 located inside the first receiving space 211 to abut against each other, causing the ball bearing 22 to abut against the connector 21, closing the insulating oil passage through a hard seal between the metal parts. This ingenious structural design is easy to operate and solves the problem of not being able to adjust the flow rate of insulating oil during the transport process, significantly improving the reliability of the equipment connection and the convenience of operation.

[0034] The connector 21 is made of stainless steel, which has good corrosion resistance. Stainless steel can effectively resist corrosion of the connector 21 by transformer insulating oil and corrosive gases. The connector 21 is a flange type connector and is welded to the transformer. The connector 21 is connected to the transformer insulating oil pipeline through the first receiving space 211 opened inside.

[0035] The ball bearing 22 is made of steel with high hardness and good wear resistance. The size of the ball bearing 22 is adjusted according to actual needs so that the insulating oil passage can be closed when the ball bearing 22 abuts against the connector 21.

[0036] The valve core 1 is cylindrical in shape. The outermost diameter of the valve core 1's cross-section is typically 4 to 10 mm, but in this case, the outermost diameter is 6 mm. The valve core 1 is made of copper, which has good corrosion resistance and strength. A smooth channel 11 is provided inside the valve core 1 to reduce resistance to the flow of insulating oil.

[0037] In one embodiment, the valve core 1 has a plurality of holes 12 on its outer peripheral surface near the connector 21, and the plurality of holes 12 are connected to the channel 11.

[0038] In this embodiment, the hole 12 allows insulating oil to enter the channel 11 through the hole 12 on the outer peripheral surface, increasing the pathways for insulating oil to enter the channel 11. Compared to entering the channel 11 only from the end, this improves the efficiency of insulating oil entering the channel 11.

[0039] In one embodiment, the first accommodating space 211 includes a connecting area 2111, a chamfered area 2112, and an accommodating area 2113 arranged sequentially. The connecting area 2111 is used to connect the oil circuit of the transformer, the accommodating area 2113 is used to accommodate the end of the valve core 1, the chamfered area 2112 is used to connect the connecting area 2111 and the accommodating area 2113, the inner diameter of the chamfered area 2112 gradually increases from the side where the connecting area 2111 is located toward the side where the accommodating area 2113 is located, and the joint 21 is used to surround the inner wall 212 of the chamfered structure and is used to detachably abut against the ball 22.

[0040] In this embodiment, the connection area 2111 connects to the transformer's insulating oil pipeline, allowing the insulating oil inside the transformer to flow smoothly into the first receiving space 211. The receiving area 2113 ensures the stability of the relative position between the valve core 1 and the connector 21. The chamfered area 2112 makes the flow of insulating oil from the connection area 2111 into the receiving area 2113 smoother, reducing the resistance to the flow of insulating oil. When the rotating sealing cover 23 causes the valve core 1 to abut or separate from the ball 22, the flow rate of insulating oil entering the channel 11 from the first receiving space 211 is adjusted through the cooperation of the ball 22 and the inclined inner wall 212.

[0041] In one embodiment, the sleeve drive assembly 2 further includes a first sealing ring 24 and a second sealing ring 25. The first sealing ring 24 is disposed on the contact surface between the connector 21 and the valve core 1, and the second sealing ring 25 is disposed on the contact surface between the connector 21 and the sealing cover 23.

[0042] In this embodiment, the first sealing ring 24 prevents insulating oil from leaking outward from the contact surface between the connector 21 and the valve core 1, ensuring the sealing performance of the connection between the valve core 1 and the connector 21. The second sealing ring 25 prevents insulating oil from leaking outward from the contact surface between the connector 21 and the sealing cap 23, further enhancing the sealing performance of the entire sleeve drive assembly 2. Through the cooperation of the first sealing ring 24 and the second sealing ring 25, leakage of insulating oil during transportation is avoided, improving the reliability and stability of the shut-off valve.

[0043] In one embodiment, a slot 231 is provided on the outer peripheral surface of the sealing cap 23 away from the connector 21. The slot 231 is used to allow the sealing cap 23 to be clamped and driven to rotate.

[0044] In this embodiment, the slot 231 can be a rectangular slot or a triangular slot. By providing the slot 231, it is convenient to use tools such as wrenches to tighten and rotate the sealing cap 23.

[0045] In one embodiment, the sleeve drive assembly 2 further includes a clamping screw cap 26, which is sleeved on the outer peripheral surface of the valve core 1. The clamping screw cap 26 is located at the end of the sealing cover 23 away from the connector 21 and is in tight engagement with the sealing cover 23.

[0046] In this embodiment, the clamping cap 26 is a hexagonal cap made of stainless steel. The clamping cap 26 can further fix the sealing cap 23 and enhance the stability of the connection. The clamping cap 26 is used to prevent the sealing cap 23 and the valve core 1 from loosening, ensuring the stable spiral connection between the sealing cap 23 and the connector 21, thereby ensuring the stable driving effect of the sealing cap 23 on the valve core 1.

[0047] In one embodiment, the sleeve drive assembly 2 further includes an elastic sealing gasket 27 disposed between the clamping screw cap 26 and the sealing cap 23.

[0048] In this embodiment, the elastic sealing gasket 27 can be a gasket layer with good sealing and chemical corrosion resistance, such as a graphite gasket. The elastic sealing gasket 27 is partially disposed on the contact surface between the tightening screw cap 26 and the valve core 1, and partially extends beyond the contact surface of the tightening screw cap 26 and the valve core 1. The tightening screw cap 26 further improves the sealing performance and prevents insulating oil leakage by compressing the elastic sealing gasket 27 that extends beyond the contact surface of the tightening screw cap and the valve core 1.

[0049] In one embodiment, the flow-adjustable shut-off valve connecting the transformer and the photoacoustic spectrometer further includes a two-way ball valve 3. The other end of the valve core 1 away from the ball 22 is located outside the sleeve drive assembly 2 and is connected to the two-way ball valve 3. The two-way ball valve 3 is also used to connect to the photoacoustic spectrometer.

[0050] In this embodiment, the two-way ball valve 3 can effectively control the flow of insulating oil from the transformer to the photoacoustic spectrometer via the valve core 1, providing a flexible control method for the insulating oil delivery process.

[0051] In one embodiment, the two-way ball valve 3 further includes a valve body 31, a ball 32, and a valve stem 33. The valve body 31 has a communicating second receiving space 311 and a first through hole 312 inside. The ball 32 is rotatably disposed in the second receiving space 311, and the ball 32 has a second through hole 321. The valve stem 33 passes through the first through hole 312 and is connected to the top of the ball 32. The valve stem 33 is used to drive the ball 32 to rotate, so that the second through hole 321 is connected to or not connected to the channel 11.

[0052] In this embodiment, the valve body 31, ball 32, and valve stem 33 are all made of stainless steel, which has good rigidity and corrosion resistance. The valve stem 33 drives the ball 32 to rotate, causing the second through hole 321 to connect or disconnect from the channel 11, thereby controlling the opening and closing of the channel 11. This arrangement improves the controllability and stability of the entire system, and also facilitates system maintenance and repair.

[0053] In one embodiment, the two-way ball valve 3 further includes a plurality of gaskets 34 disposed in a second receiving space 311 between the ball 32 and the valve body 31.

[0054] In this embodiment, the multiple gaskets 34 can be polytetrafluoroethylene gaskets 34 with good corrosion resistance and self-lubricating properties. The multiple gaskets 34 can enhance the sealing between the ball 32 and the valve body 31, prevent insulating oil from leaking out from the second receiving space 311 between the ball 32 and the valve body 31, and ensure the normal operation of the shut-off valve and the stability of the insulating oil delivery.

[0055] The implementation principle of this embodiment is as follows: This shut-off valve achieves precise and stable regulation of the insulating oil flow rate through the cooperation of the sleeve drive assembly 2 and the valve core 1. The separable contact between the ball bearing 22 and the valve core 1 causes the ball bearing 22 and the connector 21 to separate and contact, and the gap between the ball bearing 22 and the connector 21 is adjustable, allowing flexible control of the insulating oil flow rate according to actual needs. Simultaneously, the sealing configuration of the first sealing ring 24, the second sealing ring 25, the elastic sealing gasket 27, and the gasket 34 ensures the sealing performance of the connection, prevents insulating oil leakage, and improves the accuracy of detection and the normal operation of the equipment. The two-way ball valve 3 controls the opening and closing of the insulating oil channel 11, making the entire connection system more reliable. Compared with existing technologies, this effectively solves the shortcomings of traditional valves in terms of insulating oil flow regulation and connection sealing, improving the performance of transformer and photoacoustic spectrometer connection detection in power systems.

[0056] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flow-adjustable shut-off valve for connecting a transformer and a photoacoustic spectrometer, characterized in that, include: The valve core (1) has a channel (11) extending along its axis, the channel (11) being used to transport the liquid to be transported; The sleeve drive assembly (2) includes a connector (21), balls (22), and a sealing gland (23); the connector (21) is used to connect to the transformer, and a first receiving space (211) for connecting the oil passage of the transformer is provided inside the connector (21); the balls (22) are sandwiched between the connector (21) and the valve core (1) and are movably arranged relative to the connector (21) and the valve core (1) respectively, and the gap is adjustable; the first receiving space (211) is used to accommodate the... The ball (22) and the valve core (1) are separable from the end of the ball (22); the sealing cap (23) is spirally connected to the connector (21), the sealing cap (23) is sleeved on the outer periphery of the valve core (1) and drivenly connected to the valve core (1), for rotating the sealing cap (23) to drive the valve core (1) to abut or separate from the ball (22), and for adjusting the flow rate of liquid entering the channel (11) from the first accommodating space (211).

2. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, The first accommodating space (211) includes a connecting area (2111), a chamfered area (2112), and an accommodating area (2113) arranged in sequence. The connecting area (2111) is used to connect the oil circuit of the transformer. The accommodating area (2113) is used to accommodate the end of the valve core (1). The chamfered area (2112) is used to connect the connecting area (2111) and the accommodating area (2113). The inner diameter of the chamfered area (2112) gradually increases from the side where the connecting area (2111) is located toward the side where the accommodating area (2113) is located. The joint (21) is used to surround the inner wall (212) of the chamfered structure and is used to detachably abut against the ball (22).

3. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, The valve core (1) has several holes (12) on its outer peripheral surface near the connector (21), and the holes (12) are connected to the channel (11).

4. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, The sealing cap (23) has a slot (231) on its outer peripheral surface away from the joint (21). The slot (231) is used to allow the sealing cap (23) to be clamped and driven to rotate.

5. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, The sleeve drive assembly (2) further includes a first sealing ring (24) and a second sealing ring (25). The first sealing ring (24) is disposed on the contact surface between the connector (21) and the valve core (1), and the second sealing ring (25) is disposed on the contact surface between the connector (21) and the sealing cover (23).

6. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, The sleeve drive assembly (2) further includes a clamping screw cap (26), which is sleeved on the outer peripheral surface of the valve core (1). The clamping screw cap (26) is located at the end of the sealing cover (23) away from the joint (21) and is in tight fit with the sealing cover (23).

7. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 6, characterized in that, The socket drive assembly (2) further includes an elastic sealing gasket (27), which is disposed between the clamping screw cap (26) and the sealing cap (23).

8. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 1, characterized in that, It also includes a two-way ball valve (3), the other end of the valve core (1) away from the ball (22) is located outside the sleeve drive assembly (2) and communicates with the two-way ball valve (3), the two-way ball valve (3) is also used to communicate with the photoacoustic spectrometer.

9. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 8, characterized in that, The two-way ball valve (3) also includes: The valve body (31) has a second accommodating space (311) and a first through hole (312) inside. A sphere (32) is rotatably disposed in the second receiving space (311), and the sphere (32) is provided with a second through hole (321). A valve stem (33) passes through the first through hole (312) and is connected to the top of the ball (32). The valve stem (33) is used to drive the ball (32) to rotate so that the second through hole (321) is connected to or not connected to the channel (11).

10. The flow-adjustable shut-off valve for connecting the transformer and the photoacoustic spectrometer according to claim 8, characterized in that, The two-way ball valve (3) also includes a plurality of gaskets (34), which are disposed in a second receiving space (311) between the ball (32) and the valve body (31).

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