Valve device

Abstract

The utility model relates to the technical field of valves, in particular to a valve device which comprises a valve body and a valve core assembly, the valve core assembly comprises a force transmission seat and a valve rod, the valve body is connected with an installation shell, the valve body is provided with a valve cavity, the installation shell is provided with an installation cavity, the force transmission seat is installed in the installation cavity, and the cavity bottom of the installation cavity is provided with a through hole matched with the valve rod. One end of the valve rod is connected with the force transmission base, the other end of the valve rod penetrates through the penetrating hole and extends into the valve cavity, a sealing piece is arranged between the valve element assembly and the mounting shell, the sealing piece is located on the side, away from the valve cavity, of the penetrating hole, and the sealing piece is arranged between the force transmission base and the cavity wall of the mounting cavity so as to conduct sealing when the force transmission base moves relative to the mounting shell; the sealing piece can be relatively far away from the valve cavity, the valve rod and the penetrating hole are matched to play a certain role in separating the mounting cavity from the valve cavity, the internal environment of the mounting cavity is clean relative to the valve cavity, the service life of the sealing piece is guaranteed, and the sealing reliability is not prone to being affected by sundries in the valve cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a valve device. Background Art

[0002] For intrinsically safe gas detection equipment for mining, it is connected to the pipeline through valves. Some valves will use electric valves driven by motors. Compared with solenoid valves driven by electromagnetics, electric valves have reliable stability and safety and are widely used in the field of intelligent control valves.

[0003] The existing electric valve, such as an electric constant pressure valve disclosed in the Chinese utility model patent with authorization announcement number CN218408539U, comprises a valve body, a sealing disk, and a shell. The sealing disk and the shell constitute a mounting shell. The valve body has a valve cavity, the mounting shell has a mounting cavity, the sealing disk constitutes the cavity bottom of the mounting cavity, a driving motor is fixed on the shell, the output end of the driving motor is connected to a screw rod extending into the shell, the screw rod is threadedly connected to a nut seat located in the shell, the nut seat is connected to a connecting sleeve, the connecting sleeve is connected to a connecting rod, the connecting sleeve is located in the mounting cavity, and the connecting The sleeve is installed in the outer shell by a limit piece to prevent rotation. One end of the connecting rod is connected to the connecting sleeve, and the other end passes through the center hole of the sealing disk and extends into the valve cavity. The connecting rod is connected to the valve core. The nut seat, connecting sleeve, connecting rod and valve core constitute the valve core assembly. The connecting rod constitutes the valve stem. The center hole of the sealing disk constitutes a through hole for the valve stem to pass through. The nut seat and the connecting sleeve constitute a force transmission seat. The screw rod is driven to rotate by a driving motor. Under the action of the screw nut mechanism formed by the screw rod and the nut seat, the nut seat moves along the axial direction of the valve body with the connecting sleeve, the connecting rod and the valve core to realize the opening and closing of the valve.

[0004] In order to seal the valve core assembly with the mounting housing, the electric valve is provided with a first sealing member in the center hole of the sealing disk of the mounting housing. The first sealing member is a sealing ring. The center hole of the sealing disk is used to guide the movement of the connecting rod while the sliding seal is achieved through the first sealing member. When this electric valve is used as a valve device for intrinsically safe gas detection equipment for mining, in addition to gas, there will be coal ash or other large particles in the pipeline connected to the valve. These coal ash or other large particles will enter the valve cavity of the valve, making the valve cavity always a relatively harsh environment. Coal ash or other large particles will adhere to the connecting rod connected to the valve core. The first sealing member is provided in the center hole of the sealing disk of the mounting housing for the connecting rod to pass through and is adjacent to the valve cavity. In this way, when the valve is opened, the connecting rod moves along the center hole of the sealing disk of the mounting housing. The part of the connecting rod exposed in the valve cavity with more particles attached will rub the sealing ring with the connecting rod, which will affect the sealing performance of the sealing ring. When used for a long time, it is not conducive to reliable sealing. Utility Model Content

[0005] The utility model aims to provide a valve device to solve the problem that the existing valve device uses the portion of the valve stem exposed in the valve cavity to seal with the cavity bottom perforation of the mounting housing, but the sealing reliability is easily affected by debris in the valve cavity.

[0006] The technical solution of the valve device of the utility model is:

[0007] A valve device includes a valve body and a valve core assembly, the valve core assembly includes a force transmission seat and a valve stem, the valve body is connected to a mounting shell, the valve body has a valve cavity, the mounting shell has a mounting cavity, the force transmission seat is installed in the mounting cavity, the cavity bottom of the mounting cavity is provided with a through hole adapted to the valve stem, one end of the valve stem is connected to the force transmission seat, and the other end passes through the through hole and extends into the valve cavity, a sealing member is provided between the valve core assembly and the mounting shell, the sealing member is located in the mounting cavity and on the side of the through hole away from the valve cavity, the sealing member is arranged between the force transmission seat and the cavity wall of the mounting cavity to seal when the force transmission seat moves relative to the mounting shell.

[0008] Furthermore, a guide groove is provided on the cavity wall of the installation cavity, and a guide column is provided on the force transmission seat. The guide column extends into the guide groove to prevent the force transmission seat from rotating in the installation cavity. The guide groove extends along the axial direction of the installation shell and avoids the guide column when the force transmission seat moves axially relative to the installation shell along the installation shell. The seal is arranged on the side of the guide groove away from the through hole.

[0009] Furthermore, the sealing member is a Y-shaped sealing ring, and a sealing groove for installing the sealing member is provided on the cavity wall of the installation cavity, and the sealing groove and the guide groove are connected in the axial direction of the installation shell.

[0010] Furthermore, the mounting housing comprises a main housing and a sealing disk, the sealing disk is mounted at one end of the main housing away from the valve body, a step surface facing the sealing disk is provided in the main housing, and the sealing groove is formed between the sealing disk and the step surface.

[0011] Furthermore, the force transmission seat is a force transmission rod, and threaded holes are respectively provided at both ends of the force transmission rod. The threaded hole at one end of the force transmission rod is used to connect the screw rod, and the threaded hole at the other end is used to connect the valve stem.

[0012] Furthermore, a valve core is provided at one end of the valve stem extending into the valve cavity, the through hole has a first opening facing the valve cavity, and the valve core has a stopper for cooperating with the opening edge of the first opening of the through hole when the valve device is opened.

[0013] Furthermore, a valve core is provided at one end of the valve stem extending into the valve cavity, and a valve seat cooperating with the valve core for closing the valve device is provided in the valve cavity, and the valve seat has a plane in sealing contact with the valve core.

[0014] Furthermore, the valve seat is an annular boss, and the top surface of the annular boss is a plane for sealing contact with the valve core.

[0015] Furthermore, a sealing ring is provided on the valve core for pressing contact with the top surface of the annular boss.

[0016] Furthermore, a valve core is provided at one end of the valve stem extending into the valve cavity, a spring is provided in the valve cavity, the spring is sleeved outside the valve stem, one end of the spring abuts against the valve core, and the other end abuts against the mounting housing.

[0017] Beneficial effects: The utility model is improved on the basis of the valve device in the prior art, and a sealing member is arranged between the force transmission seat and the mounting shell. The force transmission seat is located in the mounting cavity of the mounting shell, and the force transmission seat can move in the mounting cavity. The sealing member forms a seal between the force transmission seat and the cavity wall of the mounting cavity. The mounting cavity of the mounting shell and the valve cavity of the valve body are respectively located on both sides of the perforation. The perforation is for the valve stem to fit through and the sealing member is located on the side of the hole away from the valve cavity, so that the sealing member is located in the mounting cavity, and the sealing member can be relatively far away from the valve cavity. The valve stem and the perforation can play a certain role in separating the mounting cavity and the valve cavity, and can play a certain role in dust avoidance by matching the valve stem and the perforation with a small gap, so that the internal environment of the mounting cavity is relatively clean relative to the valve cavity, which is conducive to ensuring the service life of the sealing member, and is not easily affected by debris in the valve cavity. The sealing groove of the mounting seal is connected with the guide groove on the cavity wall of the mounting cavity, which is convenient for the gas pressure to be transmitted to the seal member. The gas pressure can be used to expand the seal member, which helps to improve the sealing reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of the valve device of the utility model;

[0019] Figure 2 for Figure 1 A cross-sectional view of the valve device in FIG.

[0020] Figure 3 for Figure 1 A top view of the main housing in FIG.

[0021] Figure 4 for Figure 1 Schematic diagram of the cross section of the main shell.

[0022] In the figure: 1. motor mounting seat; 2. sealing disk; 3. main housing; 4. valve body; 5. first screw; 6. second screw; 7. motor; 8. third screw; 9. screw rod; 10. force transmission rod; 11. first sealing ring; 12. valve core; 13. second sealing ring; 14. spring; 15. guide column; 16. sealing member; 17. valve stem; 18. stop surface; 19. annular boss; 20. guide groove; 21. inlet; 22. outlet; 23. sealing groove; 24. through hole; 25. mounting hole; 26. step surface. DETAILED DESCRIPTION

[0023] The utility model provides a sealing member between the force transmission seat and the mounting shell of the valve device. The force transmission seat is located in the mounting cavity of the mounting shell. The force transmission seat can move in the mounting cavity. The sealing member forms a seal between the force transmission seat and the cavity wall of the mounting cavity. The mounting cavity of the mounting shell and the valve cavity of the valve body are respectively located on both sides of the through hole. The through hole is for the valve stem to fit through and the sealing member is located on the side of the hole away from the valve cavity. In this way, the sealing member is located in the mounting cavity. The sealing member can be relatively away from the valve cavity, and the valve stem and the through hole can cooperate to play a certain role in separating the mounting cavity and the valve cavity. The internal environment of the mounting cavity is relatively clean compared to the valve cavity, which is conducive to ensuring the service life of the sealing member and is not easily affected by debris in the valve cavity. The sealing reliability.

[0024] Embodiment of the valve device of the utility model:

[0025] like Figure 1 , Figure 2 As shown, the valve device includes a valve body 4, a mounting housing, a valve core assembly and a motor 7. The valve body 4 is fixedly connected to the mounting housing. The mounting housing includes a main housing 3. The main housing 3 is connected to a sealing disk 2. The sealing disk 2 is connected to a motor mounting seat 1. The motor 7 is mounted on the motor mounting seat 1. The valve core assembly includes a force transmission rod 10, a valve stem 17 and a valve core 12. The valve core assembly is in driving connection with the motor 7. The valve device is an electric valve. The motor 7 drives the valve core assembly to move to realize the opening and closing of the valve.

[0026] The valve body 4 has a valve cavity, and an inlet hole and an outlet hole communicating with the valve cavity are provided on the valve body 4. The outer opening of the inlet hole located on the outer surface of the valve body 4 constitutes an inlet 21, and the outer opening of the outlet hole located on the outer surface of the valve body 4 constitutes an outlet 22. The inlet hole extends along the axial direction of the valve body 4, and the extension direction of the outlet hole is perpendicular to the extension direction of the inlet hole. The aperture of the outlet hole is larger than that of the inlet hole, which can reduce the risk of blockage. A valve seat is provided in the valve cavity, and the valve core 12 cooperates with the valve seat to connect and block the inlet 21 and the outlet 22.

[0027] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the mounting shell has a mounting cavity, which includes the center hole of the sealing disk 2, the sealing groove 23 surrounded by the main shell 3 and the sealing disk 2, and the guide groove 20 and the mounting hole 25 of the main shell 3. The force transmission rod 10 is penetrated through the center hole of the sealing disk 2 and the mounting hole 25 of the main shell 3. A through hole 24 is provided on the main shell 3 on the side of the mounting hole 25 close to the valve body 4. The aperture of the mounting hole 25 is larger than the aperture of the through hole 24. An annular surface facing the force transmission rod 10 is formed at the junction of the mounting hole 25 and the through hole 24. The annular surface constitutes the cavity bottom of the mounting cavity, and the through hole 24 is arranged at the cavity bottom of the mounting cavity. The force transmission rod 10 is installed in the installation cavity, one end of the valve stem 17 is connected to the force transmission rod 10, and the other end passes through the through hole 24 and extends into the valve cavity. The through hole 24 is adapted to the valve stem 17 to guide the movement of the valve stem 17. A seal 16 is provided between the force transmission rod 10 and the installation housing. The seal 16 is located on the side of the through hole 24 away from the valve cavity. When the force transmission rod 10 moves relative to the installation housing, a sliding seal is formed between the force transmission rod 10 and the cavity wall of the installation cavity. The internal space of the installation cavity is relatively large, and the seal 16 is located in the installation cavity. The seal 16 can be relatively far away from the valve cavity, and the valve stem 17 and the through hole 24 can cooperate to play a certain role in separating the installation cavity and the valve cavity. The internal environment of the installation cavity is relatively clean compared to the valve cavity, which is conducive to ensuring the service life of the seal 16, and it is not easy to affect the sealing reliability due to debris in the valve cavity.

[0028] The axial direction of the mounting shell is consistent with the axial direction of the valve body 4. One axial end of the main shell 3 of the mounting shell is fixedly connected to the valve body 4 by a first screw 5. The main shell 3 and the valve body 4 are sealed by a first sealing ring 11. The other axial end of the main shell 3 is fixedly connected to the sealing disk 2 and the motor mounting seat 1 by a second screw 6. The second screw 6 passes through the motor mounting seat 1 and the sealing disk 2 and is connected to the main shell 3. The sealing disk 2 is fixed between the main shell 3 and the motor mounting seat 1. The motor 7 is fixed to the motor mounting seat 1 by a third screw 8. The output shaft of the motor 7 is connected with a screw 9, and the force transmission rod 10 constitutes a force transmission seat. The two ends of the force transmission rod are respectively provided with threaded holes. The threaded hole at one end of the force transmission rod is connected to the screw 9, and the threaded hole at the other end is connected to the valve stem 17. The outer diameter of the force transmission rod 10 is larger than the outer diameter of the valve stem 17. The outer diameter of the force transmission rod 10 is adapted to the center hole of the sealing disk 2 and the aperture of the mounting hole 25. The force transmission rod is fixed in the installation cavity, and the motor 7 drives the screw rod 9 to rotate. The screw rod 9 cooperates with the corresponding threaded hole of the force transmission rod to make the force transmission rod move axially along the main housing 3. The force transmission rod 10 drives the valve stem 17 and the valve core 12 to move axially along the valve body 4 to approach or move away from the valve seat in the valve cavity.

[0029] A step surface 26 facing the sealing disk 2 is provided in the main shell 3, and an annular sealing groove 23 is formed between the sealing disk 2 and the step surface 26. The sealing member 16 is installed in the sealing groove 23. The sealing member 16 is a Y-shaped sealing ring. The Y-shaped sealing ring is used to realize a sliding seal between the force transmission rod and the cavity wall of the installation cavity. The sealing is reliable and has good pressure resistance, and is suitable for the field of coal mine gas detection.

[0030] The mounting hole 25 is located on the side of the step surface 26 away from the sealing disk 2, and the guide groove 20 is arranged on the hole wall of the mounting hole 25, that is, the guide groove 20 is arranged on the cavity wall of the mounting cavity, and the guide groove 20 has a groove bottom surface facing the force transmission rod 10. The force transmission rod 10 is provided with a guide column 15, which is threadedly connected to the force transmission rod 10, and the guide column 15 protrudes from the outer peripheral surface of the force transmission rod 10 along the radial direction of the force transmission rod 10. The guide column 15 extends into the guide groove 20 to prevent the force transmission rod 10 from rotating in the mounting cavity. The guide groove 20 extends along the axial direction of the mounting housing, and the guide column 15 can move in the guide groove 20 along the axial direction of the force transmission rod 10 to ensure that the force transmission seat can move relative to the mounting housing along the axial direction of the mounting housing.

[0031] The seal 16 is arranged on the side of the guide groove 20 away from the through hole 24, so that the seal 16 can be further away from the valve cavity, and it is also convenient to arrange the seal groove 23. The seal groove 23 and the guide groove 20 are connected in the axial direction of the installation housing, so that the gas can enter the seal groove 23 more easily, and the Y-shaped seal ring can be tightened by the gas pressure to improve the sealing force of the Y-shaped seal ring.

[0032] One end of the valve stem 17 is threadedly connected to the force transmission rod, which can adapt to the length of the valve core assembly. The end of the valve stem 17 that extends into the valve cavity is integrally connected to the main body of the valve core 12. The outer diameter of the valve core 12 is larger than the outer diameter of the valve stem 17. A valve seat that cooperates with the valve core 12 to close the valve device is provided in the valve cavity of the valve body 4. The valve seat is an annular boss 19 provided at the inner orifice of the inlet 21 hole of the valve body 4. The top surface of the annular boss 19 is a plane for sealing contact with the valve core 12. The valve core 12 is provided with a second sealing ring 13 for pressing contact with the top surface of the annular boss 19. When the valve device is closed, the valve core 12 sits on the annular boss 19, and the top surface of the annular boss 19 presses the second sealing ring 13 to form a sealing match. The valve core 12 and the valve seat adopt a flat sealing method, which can withstand higher sealing pressure and has a wide range of applications.

[0033] The main housing 3 has a boss extending into the valve cavity of the valve body 4. The through hole 24 has a first orifice located on the top surface of the boss and facing the valve cavity. The top surface of the boss is a stop surface 18, and the top surface of the boss constitutes an orifice edge of the first orifice. The valve core 12 has a stop portion for cooperating with the stop surface 18 when the valve device is opened to limit the movement stroke of the valve core 12.

[0034] A spring 14 is provided in the valve cavity of the valve body 4. The spring 14 is sleeved on the outside of the valve stem 17. One end of the spring 14 abuts against the valve core 12 and the other end abuts against the main housing 3. The spring 14 is a compression spring, which can buffer the impact of gas on the valve core 12 and also facilitate the valve core 12 to form a seal with the valve seat.

[0035] In other embodiments, the sealing groove can also be set on the side of the guide groove close to the through hole, and the sealing groove can be set on the hole wall of the mounting hole. At this time, in order to ensure that the force transmission rod and the main shell body maintain a sliding seal, the axial length of the mounting hole is increased, and the part of the mounting hole located on the side of the guide groove close to the through hole has sufficient length to ensure that the force transmission rod can maintain a seal during its moving stroke after the sealing groove is set.

[0036] In other implementations, the sealing member may also be an O-ring.

[0037] In other implementations, the sealing groove and the guide groove may also be separated from each other.

[0038] In other implementations, the sealing disk and the main housing may also be integrally provided, and the sealing groove may be integrally formed on the mounting housing.

[0039] In other implementations, the valve stem may also be fixed to the force transmission rod by welding.

[0040] In other implementations, the valve core and the valve seat may also be sealed by conical contact.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A valve device, comprising a valve body and a valve core assembly, the valve core assembly comprising a force transmission seat and a valve stem, the valve body is connected to a mounting housing, the valve body has a valve cavity, the mounting housing has a mounting cavity, the force transmission seat is mounted in the mounting cavity, the cavity bottom of the mounting cavity is provided with a through hole adapted to the valve stem, one end of the valve stem is connected to the force transmission seat, and the other end passes through the through hole and extends into the valve cavity, a sealing member is provided between the valve core assembly and the mounting housing, wherein the feature is that: The sealing member is located in the installation cavity and on the side of the perforation away from the valve cavity. The sealing member is arranged between the force transmission seat and the cavity wall of the installation cavity to perform sealing when the force transmission seat moves relative to the installation housing.

2. The valve device according to claim 1, characterized in that: A guide groove is provided on the cavity wall of the installation cavity, and a guide column is provided on the force transmission seat. The guide column extends into the guide groove to prevent the force transmission seat from rotating and is installed in the installation cavity. The guide groove extends along the axial direction of the installation shell and avoids the guide column when the force transmission seat moves axially relative to the installation shell along the installation shell. The seal is arranged on the side of the guide groove away from the through hole.

3. The valve device according to claim 2, characterized in that: The sealing member is a Y-shaped sealing ring. A sealing groove for installing the sealing member is arranged on the cavity wall of the installation cavity. The sealing groove and the guide groove are connected in the axial direction of the installation housing.

4. The valve device according to claim 3, characterized in that: The mounting housing comprises a main housing and a sealing disk. The sealing disk is mounted on one end of the main housing away from the valve body. A step surface facing the sealing disk is arranged in the main housing. The sealing groove is formed between the sealing disk and the step surface.

5. The valve device according to any one of claims 1 to 4, characterized in that: The force transmission seat is a force transmission rod, and threaded holes are respectively arranged at both ends of the force transmission rod. The threaded hole at one end of the force transmission rod is used to connect the screw rod, and the threaded hole at the other end is used to connect the valve stem.

6. The valve device according to any one of claims 1 to 4, characterized in that: One end of the valve stem extending into the valve cavity is provided with a valve core, the through hole has a first orifice facing the valve cavity, and the valve core has a stopper for stopping and cooperating with the orifice edge of the first orifice of the through hole when the valve device is opened.

7. The valve device according to any one of claims 1 to 4, characterized in that: One end of the valve stem extending into the valve cavity is provided with a valve core, and a valve seat cooperating with the valve core for closing the valve device is provided in the valve cavity, and the valve seat has a plane in sealing contact with the valve core.

8. The valve device according to claim 7, characterized in that: The valve seat is an annular boss, and the top surface of the annular boss is a plane for sealing contact with the valve core.

9. The valve device according to claim 8, characterized in that: A sealing ring for pressing and contacting with the top surface of the annular boss is arranged on the valve core.

10. The valve device according to any one of claims 1 to 4, characterized in that: One end of the valve stem extending into the valve cavity is provided with a valve core, and a spring is provided in the valve cavity. The spring is sleeved outside the valve stem, and one end of the spring abuts against the valve core, and the other end abuts against the mounting shell.

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