A new reverse truncation device

Abstract

The utility model relates to a novel reverse cutting device, including: the inside of valve seat is equipped with the valve cavity that penetrates, and the valve port portion is shaped in the valve cavity, the valve sleeve is located valve port portion one side and is opposite static with the arrangement of valve seat, and the valve sleeve inner chamber and valve seat inner chamber intercommunication, the guide shaft is axially mobile and is connected on the valve sleeve, both ends of guide shaft are arranged respectively in the both sides position of valve port portion, the utility model discloses the guide shaft is designed to pass through valve port portion, makes both ends of guide shaft arranged respectively in the both sides of valve port portion, thereby makes the distance between the one end of guide shaft and valve port portion that radial limit significantly reduces, and the guide effect is more direct, and the precision is higher, and this structure makes the axial movement of valve core in the opening and closing process more stable, avoids eccentric or swing phenomenon, improves the adhesion precision and sealing performance of valve core and valve port, simultaneously, this arrangement reduces the space that guide structure occupies, makes the valve body whole more compact, is favorable to the miniaturization design of overall structure.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, and in particular to a novel reverse cut-off device. Background Technology

[0002] A reverse shut-off device is a control element that allows fluid to flow in only one direction and automatically shuts off when the flow reverses. It is widely used in fluid pipelines such as air conditioning systems, refrigeration circuits, and hydraulic control systems. This device typically consists of a valve seat, valve core, and valve sleeve. Fluid pressure pushes the valve core to move axially, opening or closing the valve port, thereby preventing backflow or pressure surges within the system and ensuring safe and stable system operation.

[0003] However, in existing reverse cut-off structures, the axial movement of the valve core typically relies on a guide shaft and guide sleeve coaxially arranged thereto for guiding engagement. Current designs often place the guide shaft on one side of the valve port, with a guide sleeve on that side for limiting and guiding the movement, allowing the valve core to reciprocate within a single area of ​​the valve port. While this structure achieves basic guiding functionality, it has the following drawbacks: First, the concentration of the guide shaft and valve core on the same side of the valve port increases the overall axial length of the structure, resulting in a larger device size; second, the force and guiding position of the valve core and guide shaft deviate from the center of the valve port, easily causing a decrease in guiding accuracy and valve core movement deviation; third, due to the large isolation distance between the valve port and the guide sleeve, local resistance increases when fluid passes through, affecting fluid flow efficiency. Utility Model Content

[0004] To address the problems of limited guiding structure, large size, and insufficient compact layout of existing one-way valves mentioned in the background art, this application provides a novel reverse shut-off device.

[0005] The novel reverse cutoff device provided in this application adopts the following technical solution:

[0006] A novel reverse cutoff device includes:

[0007] The valve seat has a through valve cavity inside, and a valve port is formed inside the valve cavity;

[0008] A valve sleeve is located on one side of the valve port and is stationary relative to the valve seat. The inner cavity of the valve sleeve is in communication with the inner cavity of the valve seat.

[0009] A guide shaft is axially movable and connected to the valve sleeve, with its two ends respectively located on both sides of the valve port.

[0010] The valve core, which is fixedly connected to the guide shaft, is located on the other side of the valve port relative to the valve sleeve, and is used to cooperate with the valve port to realize the opening and closing of the valve.

[0011] By employing the aforementioned technical solution, the guide shaft is designed to pass through the valve port, with both ends of the guide shaft positioned on opposite sides of the valve port. This significantly reduces the distance between the radially limited end of the guide shaft and the valve port, resulting in a more direct and precise guiding effect. This structure also makes the axial movement of the valve core more stable during opening and closing, avoiding eccentricity or oscillation, and improving the fitting accuracy and sealing performance between the valve core and the valve port. Furthermore, this arrangement reduces the space occupied by the guide structure, making the valve body more compact and facilitating the miniaturization of the overall structure.

[0012] Optionally, the valve sleeve and the valve seat are coaxially arranged, and a guide sleeve is fixed at the center of the valve sleeve. The guide sleeve extends from the end wall of the valve sleeve toward the valve port, and the guide shaft slides in conjunction with the guide sleeve.

[0013] By using the above technical solution, the valve sleeve and valve seat are arranged coaxially, which simplifies the structure and facilitates rapid assembly. A guide sleeve is set at the center of the valve sleeve, which slides with the guide shaft to play a guiding and positioning role. At the same time, the guide shaft extends along the valve port, making the valve core movement more stable and significantly improving the guiding accuracy.

[0014] Optionally, the end of the guide shaft is provided with a limiting part for axially limiting the guide shaft. The limiting part can abut against the end wall of the valve sleeve to achieve axial limiting of the guide shaft. The structure of the limiting part includes, but is not limited to, the following:

[0015] The limiting part is a convex ring integrally connected to the end of the guide shaft and extending outward in a radial direction;

[0016] The limiting part is a limiting plate fixed to the end of the guide shaft, and the diameter of the limiting plate is larger than the diameter of the guide shaft;

[0017] The limiting part is a stepped sleeve fixed to the end of the guide shaft, and the outer diameter of the stepped sleeve gradually increases from the end away from the valve port towards the valve port.

[0018] Through the above technical solution, the limiting part can prevent the guide shaft from detaching from the valve sleeve during the valve opening process, thus achieving axial limiting. The limiting part can adopt different structural forms to meet diverse design requirements, such as a convex ring, a limiting plate, or a stepped sleeve. The outer diameter of the stepped sleeve gradually increases from the end away from the valve port towards the valve port. The step-by-step radial structure of the stepped sleeve forms a flow guiding path, guiding the fluid to flow smoothly around the end of the guide shaft, reducing local eddy current impact, and providing radial support to make the movement of the guide shaft more stable, thereby ensuring the smooth and reliable opening and closing action of the valve core.

[0019] Optionally, the end of the valve sleeve is provided with several liquid passage holes.

[0020] The above technical solution connects the inner cavity of the valve sleeve with the valve cavity of the valve seat through the liquid passage, so that after the valve core is opened, the fluid can flow normally through the liquid passage.

[0021] Optionally, the reverse cut-off device is provided with a first mounting position and a second mounting position at both ends. The first mounting position is used to connect to the first pipeline, and the second mounting position is used to connect to the second pipeline, so as to reliably install the reverse cut-off device in the pipeline system and realize unidirectional flow control of fluid.

[0022] The above technical solution is mainly used to connect the reverse cut-off device with the external pipeline and assemble it into the pipeline system.

[0023] Optionally, the first mounting position is formed in an axially extending inner cavity channel at one end of the valve seat; or

[0024] One end of the valve seat is fixed with a first pair of connecting pipes, which communicate with the valve cavity of the valve seat. The first mounting position is formed in the inner cavity channel of the first pair of connecting pipes; or

[0025] The first mounting position is formed in the inner cavity channel of the valve sleeve.

[0026] Optionally, the second mounting position is formed in an axially extending inner cavity channel at one end of the valve seat; or

[0027] A second pair of connecting pipes is fixed on the valve seat. The second pair of connecting pipes extends axially outward from the valve seat, and a second mounting position is formed at the end cavity of the second pair of connecting pipes.

[0028] Through the above technical solutions, different methods can be selected to form the first and second mounting positions according to actual needs, adapting to the docking requirements of different pipeline systems and expanding the application range of the reverse cut-off device.

[0029] Optionally, when the first mounting position is formed in the inner cavity channel extending axially at one end of the valve seat, the valve seat extends axially toward the outside of the valve sleeve, the first pipe is installed in the first mounting position and the end of the first pipe abuts against the end of the valve sleeve.

[0030] The above technical solution allows the valve sleeve to be used as an abutment in the first pipeline docking process, thereby achieving axial limiting of the first pipeline and directly docking the first pipeline to the valve seat. This simplifies the overall structure of the reverse cut-off device and reduces costs.

[0031] Optionally, when a first pair of connecting pipes is fixed to one end of the valve seat, the first pair of connecting pipes is at least partially sleeved on the inner cavity or outer wall of the valve seat, or the first pair of connecting pipes is fixed to the end of the valve seat.

[0032] By using the above technical solution, the first pair of connecting pipes is used as an intermediate connector to connect the first pipeline to the valve seat. If the connection part is damaged, only the first pair of connecting pipes needs to be replaced for reuse, thus avoiding waste.

[0033] Optionally, when a second pair of connecting pipes is fixed on the valve seat, a limiting ring is formed at the root position of the second mounting position. The structure of the second pair of connecting pipes includes, but is not limited to, the following:

[0034] The second pair of connecting pipes is sleeved on the outside of the valve seat, and the second pair of connecting pipes extends towards the end of the valve seat and narrows to form a second mounting position;

[0035] The second pair of connecting pipes is sleeved in the port cavity of the valve seat, and the second pair of connecting pipes extends outward from the valve seat and forms a second mounting position in the cavity.

[0036] Optionally, when the valve seat is fixed with a first pair of connecting pipes and a second pair of connecting pipes, the first pair of connecting pipes and the second pair of connecting pipes are either separate structures or integrated structures.

[0037] By adopting the above technical solutions and using different installation methods, the second connecting pipe can be connected to the valve seat to meet different working conditions.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] This invention designs the guide shaft to pass through the valve port, with both ends of the guide shaft positioned on opposite sides of the valve port. This significantly reduces the distance between the radially limited end of the guide shaft and the valve port, resulting in a more direct and precise guiding effect. This structure makes the axial movement of the valve core more stable during opening and closing, avoiding eccentricity or oscillation, and improving the fitting accuracy and sealing performance between the valve core and the valve port. At the same time, this arrangement reduces the space occupied by the guide structure, making the valve body more compact and facilitating the miniaturization of the overall structure. Attached Figure Description

[0040] Figure 1 This is a structural diagram of Embodiment 1 of the present invention when the valve seat is not equipped with connecting pipes at both ends;

[0041] Figure 2 This is a utility model Figure 1 A structural diagram showing the connection between the first and second pipes.

[0042] Figure 3 This is a structural diagram of Embodiment 2 of the present invention, in which the valve seat does not have connecting pipes at both ends;

[0043] Figure 4 This is a structural diagram of Embodiment 3 of the present invention, in which the valve seat is not provided with connecting pipes at both ends;

[0044] Figure 5 This is a structural diagram of Embodiment 4 of the present invention, in which the valve seat is not provided with connecting pipes at both ends;

[0045] Figure 6 This is a structural diagram of Embodiment 1 of the present invention, showing the valve seat connected only to the first pair of connecting pipes.

[0046] Figure 7 This is a structural diagram of Embodiment 2 of the present invention, showing the valve seat connected only to the first pair of connecting pipes.

[0047] Figure 8 This is a structural diagram of Embodiment 3 of the present invention, showing the valve seat connected only to the first pair of connecting pipes.

[0048] Figure 9 This is a structural diagram of Embodiment 1 of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0049] Figure 10 This is a structural diagram of Embodiment 2 of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0050] Figure 11 This is a structural diagram of Embodiment 3 of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0051] Figure 12 This is a structural diagram of Embodiment 4 of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0052] Figure 13 This is a structural diagram of Embodiment 5 of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0053] Figure 14 This is a structural diagram of Embodiment Six of this utility model, showing the valve seat connected only to the second pair of connecting pipes.

[0054] Figure 15 This is a structural diagram of Embodiment Seven of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0055] Figure 16 This is the eighth structural diagram of the present invention, showing the valve seat connected only to the second pair of connecting pipes.

[0056] Figure 17 This is a structural diagram of an embodiment of the present invention in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0057] Figure 18 This is a structural diagram of Embodiment 2 of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0058] Figure 19 This is a structural diagram of Embodiment 3 of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0059] Figure 20 This is a structural diagram of Embodiment 4 of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0060] Figure 21 This is a structural diagram of Embodiment 5 of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0061] Figure 22 This is a structural diagram of Embodiment Six of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0062] Figure 23 This is a structural diagram of embodiment seven of the present invention, in which the valve seat is provided with a first pair of connecting pipes and a second pair of connecting pipes at both ends;

[0063] Figure 24 This is an eighth structural diagram of an embodiment of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0064] Figure 25 This is a structural diagram of Embodiment Nine of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0065] Figure 26 This is a structural diagram of Embodiment 10 of the present invention, in which a first pair of connecting pipes and a second pair of connecting pipes are provided at both ends of the valve seat;

[0066] Figure 27 This is a structural diagram of an embodiment of the present invention, in which the valve seat is provided with an integrally connected first pair of connecting pipes and a second pair of connecting pipes at both ends.

[0067] Explanation of reference numerals in the attached figures:

[0068] 1. Valve seat; 101. Valve port; 2. Valve sleeve; 201. Guide sleeve; 202. Fluid passage hole; 3. Guide shaft; 301. Convex ring; 4. Valve core; 5. First mounting position; 6. Second mounting position; 7. First connecting pipe; 8. Second connecting pipe; 801. Limiting ring; 9. Limiting plate; 10. Stepped sleeve; 11. First pipeline; 12. Second pipeline. Detailed Implementation

[0069] The present application will be further described in detail below with reference to the accompanying drawings.

[0070] like Figure 1-2As shown, this embodiment discloses a novel reverse shut-off device, including a valve seat 1, a valve sleeve 2, a guide shaft 3, and a valve core 4. The valve seat 1 has a through-hole valve cavity, within which a valve port 101 is formed. The valve sleeve 2 is located on one side of the valve port 101 and is stationary relative to the valve seat 1. The inner cavity of the valve sleeve 2 is interconnected with the inner cavity of the valve seat 1. In this example, the valve sleeve 2 is fixed to the valve seat 1 by welding. The guide shaft 3 is axially movable and connected to the valve sleeve 2. Both ends of the guide shaft 3 are respectively located on both sides of the valve port 101. The valve core 4 is fixedly connected to the guide shaft 3 and is located on the other side of the valve port 101 relative to the valve sleeve 2, for cooperating with the valve port 101 to achieve valve opening and closing actions.

[0071] like Figure 1-2 As shown, in this example, the valve sleeve 2 and the valve seat 1 are coaxially arranged. A guide sleeve 201 is fixed at the center of the valve sleeve 2. The guide sleeve 201 extends from the end wall of the valve sleeve 2 toward the valve port 101. The guide shaft 3 is slidably engaged with the guide sleeve 201.

[0072] The two ends of the guide shaft 3 are located on both sides of the valve port 101. One end of the guide shaft 3 is slidably engaged with the guide sleeve 201 to radially limit the guide shaft 3. The other end of the guide shaft 3 is connected to the valve core 4, which engages with the valve port 101. This structural design allows the area where the guide shaft 3 engages with the guide sleeve 201 to be closer to the valve port 101, making the guiding effect of the guide sleeve 201 more direct and the axial movement accuracy of the guide shaft 3 higher. This avoids the valve core 4 from shifting, resulting in better valve opening and closing effect and more flexible response.

[0073] like Figure 1-2 As shown in this example, in order to prevent the guide shaft 3 from disengaging from the guide sleeve 201 during axial movement, the end of the guide shaft 3 is provided with a limiting part for axially limiting the guide shaft 3. The limiting part can abut against the end wall of the valve sleeve 2 to achieve axial limiting of the guide shaft 3. Specifically, the limiting part is a convex ring 301 integrally connected to the end of the guide shaft 3 and extending radially outward. That is, the outer diameter of the convex ring 301 is larger than the inner diameter of the guide sleeve 201. After the guide shaft 3 moves to the limit position of the open valve state, the convex ring 301 can contact the end of the valve sleeve 2 to achieve axial limiting of the guide shaft 3. When the guide shaft 3 moves in the opposite direction to the limit position, the valve core 4 can fit against the valve port 101, which is the closed valve state.

[0074] It is understood that in other embodiments, the structure of this limiting portion can also be in other ways, for example... Figure 3 As shown, the limiting part is a limiting plate 9 fixed to the end of the guide shaft 3. The diameter of the limiting plate 9 is larger than the diameter of the guide shaft 3. The limiting plate 9 is fixed to the end of the guide shaft 3 by welding, snap-fit ​​connection, or threaded connection. Or as... Figure 4As shown, the limiting part is a stepped sleeve 10 fixed to the end of the guide shaft 3. The outer diameter of the stepped sleeve 10 increases gradually from the end away from the valve port 101 toward the valve port 101. This allows the fluid to flow more quickly along the liquid passage 202 during the valve opening process, avoiding problems such as turbulence and resulting in better fluid flow.

[0075] like Figure 1-2 As shown in this example, the valve sleeve 2 has several liquid passage holes 202 at its end. There are three liquid passage holes 202, which are evenly distributed around the center of the valve sleeve 2 to ensure the normal flow of fluid.

[0076] In order to connect the entire reverse shut-off device with the external pipeline, the two ends of the reverse shut-off device are respectively provided with a first mounting position 5 and a second mounting position 6. The first mounting position 5 is used to connect with the first pipeline 11, and the second mounting position 6 is used to connect with the second pipeline 12, so as to reliably install the reverse shut-off device in the pipeline system and realize unidirectional flow control of fluid.

[0077] Specifically, such as Figure 1-5 As shown, the first mounting position 5 is formed in the axially extending inner cavity channel at one end of the valve seat 1, and the second mounting position 6 is formed in the axially extending inner cavity channel at one end of the valve seat 1. That is, the first mounting position 5 and the second mounting position 6 are respectively formed at the two ends of the inner cavity of the valve seat 1, which allows the valve seat 1 to be directly connected to the first pipe 11 and the second pipe 12, thereby simplifying the overall structure of the reverse shut-off device. Wherein, as... Figure 1-4 As shown, when the first mounting position 5 is formed in the axially extending inner cavity channel at one end of the valve seat 1, the valve seat 1 extends axially towards the outside of the valve sleeve 2. The first pipe 11 is installed at the first mounting position 5, and the end of the first pipe 11 abuts against the end of the valve sleeve 2, using the valve sleeve 2 as a limiting member to abut against the end of the first pipe 11. Figure 5 As shown, it differs from the above. Figure 1-4 In the embodiment, the first mounting position 5 is formed in the inner cavity channel of the valve sleeve 2, and can be directly inserted into the valve sleeve 2 to achieve docking when the first pipe 11 is docked.

[0078] In other embodiments, such as Figure 6-8 As shown, a first pair of connecting pipes 7 is fixed to one end of the valve seat 1. The first pair of connecting pipes 7 is connected to the valve cavity of the valve seat 1. The first mounting position 5 is formed in the inner cavity channel of the first pair of connecting pipes 7, while the second mounting position 6 is still formed in the inner cavity channel extending axially at one end of the valve seat 1.

[0079] Specifically, such as Figure 6As shown, when the valve seat 1 is fixed with the first pair of connecting pipes 7 at one end, the first pair of connecting pipes 7 is sleeved in the inner cavity of the valve seat 1 and abuts against the end of the valve sleeve 2. At this time, the valve sleeve 2 can be limited in the valve seat 1 by the first pair of connecting pipes 7. The first pipe 11 can be directly inserted into and connected to the inner cavity of the first pair of connecting pipes 7 during docking, thereby achieving docking. In order to achieve axial limiting of the first pipe 11, an annular protrusion is provided on the inner wall of the first pair of connecting pipes 7 near the tail. The side wall of the annular protrusion can abut against the end of the first pipe 11 to achieve the axial limiting effect of the first pipe 11.

[0080] Specifically, such as Figure 7 As shown, when the valve seat 1 is fixed with a first pair of connecting pipes 7 at one end, the first pair of connecting pipes 7 is completely fitted onto the outside of the valve seat 1, and one end continues to extend towards the end of the valve seat 1, thereby forming a first mounting position 5 at the port position to facilitate connection with the first pipe 11.

[0081] Specifically, such as Figure 8 As shown, when a first pair of connecting pipes 7 is fixed to one end of the valve seat 1, one end of the first pair of connecting pipes 7 extends into the inner cavity of the valve seat 1, and the first pair of connecting pipes 7 is partially sleeved inside the valve seat 1, which can also be used to connect to the first pipe 11.

[0082] In other embodiments, such as Figure 9-16 As shown, the first mounting position 5 is formed in the inner cavity channel extending axially at one end of the valve seat 1, and the valve seat 1 is fixed with a second pair of connecting pipes 8. The second pair of connecting pipes 8 extends axially towards the outside of the valve seat 1, and the second mounting position 6 is formed at the end cavity position of the second pair of connecting pipes 8.

[0083] Specifically, such as Figure 9 As shown, the second pair of connecting pipes 8 are sleeved on the outside of the valve seat 1, and the second pair of connecting pipes 8 extend towards the end of the valve seat 1 and narrows to form the second mounting position 6. At the root of the second mounting position 6, a limiting ring 801 with an inner diameter smaller than the inner diameter of the second mounting position 6 is provided so as to abut the end of the second pipe 12, thereby achieving axial limiting of the second pipe 12.

[0084] Specifically, such as Figure 10-11 As shown, the second pair of connecting pipes 8 are fitted into the port cavity of the valve seat 1, and the second pair of connecting pipes 8 extend outward from the valve seat 1 and form a second mounting position 6 in the cavity.

[0085] Specifically, such as Figure 12-14 As shown, the second mounting position 6 is formed in the inner cavity of the second connecting pipe 8 fixed on the valve seat 1, while the first mounting position 5 is directly formed in the inner cavity of the valve sleeve 2. That is, the first pipe 11 is directly connected to the valve sleeve 2, which can also achieve the effect of pipe connection.

[0086] Specifically, such as Figure 15-16As shown, the second connecting pipe 8 is sleeved inside the port cavity of the valve seat 1, the second mounting position 6 is located inside the pipe cavity of the second connecting pipe 8, and the first mounting position 5 is located at the end of the valve seat 1 away from the second connecting pipe 8. The only difference between the two embodiments is the limiting part on the guide shaft 3. Figure 14 The limiting part is the limiting plate 9 installed at the end of the guide shaft 3. Figure 15 The limiting part is the stepped sleeve 10 installed at the end of the guide shaft 3.

[0087] In other embodiments, such as Figure 17-26 As shown in these embodiments, a first pair of connecting pipes 7 and a second pair of connecting pipes 8 are respectively installed at both ends of the valve seat 1. The first pair of connecting pipes 7 and the second pair of connecting pipes 8 are independent components, connected to the valve seat 1 by welding, tight fitting, or direct welding. Specifically, the connection structure between the first pair of connecting pipes 7 and the valve seat 1 is as follows: the first pair of connecting pipes 7 is sleeved inside or outside the valve seat 1, and is located at the end of the valve seat 1, connecting to the first pipe 11 through a first mounting position 5 formed inside the first pair of connecting pipes 7. Similarly, the connection structure between the second pair of connecting pipes 8 and the valve seat 1 is as follows: the second pair of connecting pipes 8 is sleeved inside or outside the valve seat 1, connecting to the second pipe 12 through a second mounting position 6 formed inside the second pair of connecting pipes 8.

[0088] In other embodiments, such as Figure 27 As shown, a first pair of connecting pipes 7 and a second pair of connecting pipes 8 are provided on the valve seat 1. The first pair of connecting pipes 7 and the second pair of connecting pipes 8 are integral structures, and the integral structure formed extends axially to both ends of the valve seat 1 to achieve docking with the first pipe 11 and the second pipe 12.

[0089] In the above embodiment, the valve sleeve 2 has a structure with one end open and the other end having an end wall. The open end can face or turn away from the valve port 101. The valve sleeve 2 can be directly fixedly connected to the valve seat 1, or the valve sleeve 2 can be fixed to the end of the valve seat 1 through the first connecting pipe 7.

[0090] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A novel reverse cutoff device, characterized in that, include: The valve seat (1) has a through valve cavity inside, and a valve port (101) is formed inside the valve cavity; The valve sleeve (2) is located on one side of the valve port (101) and is stationary relative to the valve seat (1). The inner cavity of the valve sleeve (2) is connected to the inner cavity of the valve seat (1). A guide shaft (3) is axially movable and connected to the valve sleeve (2), with the two ends of the guide shaft (3) respectively located on both sides of the valve port (101); The valve core (4), which is fixedly connected to the guide shaft (3), is located on the other side of the valve port (101) relative to the valve sleeve (2) and is used to cooperate with the valve port (101) to realize the opening and closing valve action.

2. The novel reverse cutting device according to claim 1, characterized in that, The valve sleeve (2) is coaxially arranged with the valve seat (1). A guide sleeve (201) is fixed at the center of the valve sleeve (2). The guide sleeve (201) extends from the end wall of the valve sleeve (2) toward the valve port (101). The guide shaft (3) is slidably engaged with the guide sleeve (201).

3. The novel reverse cutting device according to claim 1, characterized in that, The end of the guide shaft (3) is provided with a limiting part for axially limiting the guide shaft (3). The limiting part can abut against the end wall of the valve sleeve (2) to realize the axial limiting of the guide shaft (3). The structure of the limiting part includes, but is not limited to, the following: The limiting part is a convex ring (301) integrally connected to the end of the guide shaft (3) and extending outward in the radial direction; The limiting part is a limiting plate (9) fixed to the end of the guide shaft (3), and the diameter of the limiting plate (9) is larger than the diameter of the guide shaft (3); The limiting part is a stepped sleeve (10) fixed to the end of the guide shaft (3). The outer diameter of the stepped sleeve (10) increases gradually from the end away from the valve port (101) toward the valve port (101).

4. The novel reverse cutting device according to claim 1, characterized in that, The valve sleeve (2) has several liquid passage holes (202) at its end.

5. A novel reverse cutting device according to claim 1, characterized in that, The reverse cut-off device is provided with a first mounting position (5) and a second mounting position (6) at both ends. The first mounting position (5) is used to connect to the first pipe (11), and the second mounting position (6) is used to connect to the second pipe (12), so as to reliably install the reverse cut-off device in the pipeline system and realize unidirectional flow control of fluid.

6. A novel reverse cutting device according to claim 5, characterized in that, The first mounting position (5) is formed in an axially extending inner cavity channel at one end of the valve seat (1); or One end of the valve seat (1) is fixed with a first pair of connecting pipes (7), which communicates with the valve cavity of the valve seat (1). The first mounting position (5) is formed in the inner cavity channel of the first pair of connecting pipes (7); or The first mounting position (5) is formed in the inner cavity channel of the valve sleeve (2).

7. A novel reverse cutting device according to claim 6, characterized in that, The second mounting position (6) is formed in an axially extending inner cavity channel at one end of the valve seat (1); or The valve seat (1) is fixed with a second pair of connecting pipes (8), which extends axially toward the outside of the valve seat (1), and a second mounting position (6) is formed in the end cavity of the second pair of connecting pipes (8).

8. A novel reverse cutting device according to claim 6, characterized in that, When the first mounting position (5) is formed in the inner cavity channel extending axially at one end of the valve seat (1), the valve seat (1) extends axially toward the outside of the valve sleeve (2), the first pipe (11) is installed at the first mounting position (5) and the end of the first pipe (11) abuts against the end of the valve sleeve (2).

9. A novel reverse cutting device according to claim 6, characterized in that, When the valve seat (1) is fixed with a first pair of connecting pipes (7) at one end, the first pair of connecting pipes (7) is at least partially sleeved on the inner cavity or outer wall of the valve seat (1), or the first pair of connecting pipes (7) is fixed at the end of the valve seat (1).

10. A novel reverse cutting device according to claim 7, characterized in that, When the second pair of connecting pipes (8) is fixed on the valve seat (1), a limiting ring (801) is formed at the root position of the second mounting position (6). The structure of the second pair of connecting pipes (8) includes, but is not limited to, the following: The second pair of connecting pipes (8) are fitted onto the outside of the valve seat (1), and the second pair of connecting pipes (8) extend toward the end of the valve seat (1) and narrows to form the second mounting position (6); The second pair of connecting pipes (8) are fitted into the port cavity of the valve seat (1), and the second pair of connecting pipes (8) extend outward from the valve seat (1) and form a second mounting position (6) in the cavity.

11. A novel reverse cutting device according to claim 7, characterized in that, When the valve seat (1) is fixed with the first pair of connecting pipes (7) and the second pair of connecting pipes (8), the first pair of connecting pipes (7) and the second pair of connecting pipes (8) are either separate structures or integrated structures.

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