A control valve sealing detection device

Abstract

A control valve sealing detection device includes a top seat and a base, wherein the base is arranged below the control valve, and its upper end is correspondingly connected to the bottom end of the control valve, the base is connected to a corresponding gas power source through a connected air intake pipeline, and a corresponding air intake flow meter is arranged on the air intake pipeline, the top seat is arranged above the control valve, and its lower end is correspondingly connected to the upper end of the control valve, the top seat is connected to a corresponding air outlet pipeline, and a corresponding air outlet flow meter is arranged on the air outlet pipeline, and the sealing of the control valve is detected through the mutual cooperation of the top seat and the base and their corresponding connected air intake flow meter, the gas power source, and the air outlet flow meter. The utility model makes the sealing detection of the control valve become an independent detection corresponding to itself, improves the detection accuracy and the quality and efficiency of the detection, makes the detection more convenient and faster, and improves the production efficiency of the control valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of sealing detection, in particular to a device for detecting the sealing of a control valve in a fuel injection system. Background Art

[0002] As a key component of the fuel injection system, the sealing performance of the control valve has an important influence on the effective injection pressure, injection oil volume and injection response time of the system. In the prior art, there is no corresponding detection device for the sealing performance of the control valve. The control valve can only be assembled on the injector assembly, and then the sealing performance of the control valve can be detected by the performance test of the injector assembly. However, using this detection method, not only the sealing performance of the injector assembly, but also the sealing performance of the injector assembly, such as the nozzle and the injector body, will affect the sealing performance of the injector assembly. When the performance test of the injector assembly is used to detect the sealing performance of the control valve, if the sealing performance of the other related parts of the injector assembly is abnormal, it will interfere with the detection result of the sealing performance of the control valve, thereby causing misjudgment, affecting the accuracy, quality and efficiency of the detection. In addition, the required detection conditions, detection time and labor cost are high, which seriously reduces the production efficiency and economic benefits of the control valve in the mass production process. Utility Model Content

[0003] The utility model aims to provide a device for detecting the sealing performance of a control valve 5, so as to solve the technical problem that the sealing performance of the existing control valve can only be detected by assembling it to an injector assembly, but cannot be detected separately, and the detection accuracy is low.

[0004] To achieve the above purpose, the specific technical solution of the utility model is as follows:

[0005] A control valve sealing detection device includes a top seat and a base. The base is arranged below the control valve, and its upper end is correspondingly connected to the bottom end of the control valve. The base is connected to a corresponding gas power source through a connected air intake pipeline, and a corresponding air intake flow meter is provided on the air intake pipeline. The top seat is arranged above the control valve, and its lower end is correspondingly connected to the upper end of the control valve. The top seat is connected to a corresponding air outlet pipeline, and a corresponding air outlet flow meter is provided on the air outlet pipeline. The sealing of the control valve is detected through the cooperation of the top seat and the base and their corresponding connected air intake flow meter, gas power source and air outlet flow meter.

[0006] Furthermore, the control valve includes a control valve seat, a corresponding electromagnetic actuator is fixedly installed on the periphery of the side wall of which, the two are positioned by using corresponding pins through reserved pin holes, the interior of the control valve seat is provided with a valve seat inner cavity connected to the upper and lower ends, the side wall of the control valve seat is provided with an oil passage connected from the top to the bottom thereof, a corresponding control valve core that can move up and down is provided in the valve seat inner cavity, the top end of the control valve core is lower than the upper end surface of the control valve seat, the valve seat inner cavity and the control valve core are divided into multiple sections from top to bottom for corresponding cooperation, which are: oil leakage section, upper sealing section, oil inlet section, The control valve seat has an inner cavity side wall corresponding to the oil inlet section and an oil hole to connect it with the oil passage. The control valve adjusts the state of the upper sealing section by controlling the valve core to move up and down with the cooperation of the lower sealing section. The bottom of the control valve seat is provided with a valve core seat fixedly connected to the control valve core. The side walls around the control valve seat corresponding to the lower end of the oil passage extend downward to form a boss. The lower port of the oil passage is arranged on the bottom surface of the boss. The valve core seat is provided with a boss hole corresponding to the boss. The boss passes through the boss hole and forms a ring with the corresponding gasket arranged under the valve core seat.

[0007] Furthermore, the base includes a bottom plate, and a barrel-shaped support platform with an opening upward is provided above the bottom plate, the bottom surface of the support platform is fixedly connected to the upper surface of the base, the upper surface of the upper port of the support platform corresponds to the annular lower surface composed of the gasket and the boss of the control valve, and a corresponding push rod and a compression spring are provided in the inner cavity of the support platform, the compression spring is provided on the bottom surface of the inner cavity of the support platform, and the push rod is correspondingly installed above the compression spring, and under the action of the compression spring, the top end of the push rod is against the lower surface of the valve core seat, and an air passage is provided on the side wall of the support platform, the air inlet of the air passage is provided on the outer side wall of the support platform, and is correspondingly connected to the air inlet pipeline, and the air outlet of the air passage is provided on the corresponding side wall top surface of the support platform, and is correspondingly connected to the lower port of the oil passage.

[0008] Furthermore, a corresponding annular gasket is provided between the base and the control valve, the upper surface of the support platform is attached to the lower surface of the gasket, the upper surface of the gasket is attached to the lower end surface of the ring formed by the gasket and the boss, and a through gasket hole is provided on the side wall of the gasket, the upper opening of the gasket hole corresponds to the lower port of the oil passage, and the lower opening of the gasket hole corresponds to the air outlet of the ventilation passage.

[0009] Furthermore, the cross-section of the push rod is cross-shaped, and its cross bar is arranged above the compression spring. The outer dimension of the cross bar is larger than the inner diameter of the compression spring, and the top end of the compression spring is against the lower end surface of the cross bar. The cross bar and the vertical bar are integrally formed, and the lower end of the vertical bar is correspondingly inserted into the inner circle of the compression spring. The lower end length of the vertical bar is smaller than the height of the compression spring. The push rod is arranged above the compression spring through the cross bar, and the top end of the vertical bar is inserted into the center of the gasket and its top surface is against the lower surface of the valve core seat.

[0010] Further, the top seat includes a top plate, and the upper end surface of the control valve seat is correspondingly attached to the lower surface of the top plate. A positioning hole corresponding to the pin of the control valve is provided on the lower surface of the top seat, and the depth of the positioning hole is greater than the height difference between the top end of the pin and the upper end surface of the control valve seat. A downward annular protrusion is provided on the lower surface of the top seat, which is a ring protrusion. The bottom end of the ring protrusion extends toward its inner circle to form a bottom ring corresponding to the inner circle and the upper part of the outer wall of the control valve seat. The top seat, the ring protrusion and the bottom ring form a T-shaped inner cavity opening downward, and the upper end of the control valve seat extends into the T-shaped inner cavity. The upper end of the bottom ring is lower than the outlet of the pressure relief channel on the control valve seat. A transverse hole connected to the T-shaped inner cavity is provided on the side wall of the ring protrusion, and the outer opening of the transverse hole provided on the outer wall of the ring protrusion is correspondingly connected to the air outlet pipeline.

[0011] Furthermore, a corresponding sealing plate is provided between the top seat and the control valve, the upper surface of which is attached to the lower surface of the top plate, the upper end surface of the control valve seat is attached to the lower surface of the sealing plate, and the sealing plate is provided with matching holes corresponding to the positioning holes. The sealing plate is pressed by the top seat above the upper end surface of the control valve seat, so that the upper port of the oil channel is sealed.

[0012] Furthermore, an annular transverse groove is provided on the inner side wall of the bottom ring, and a corresponding sealing ring is provided in the annular transverse groove.

[0013] The utility model relates to a control valve sealing detection device, which makes the sealing detection of the control valve become an independent detection corresponding to the control valve itself, reduces the interference of the control valve by external influences, improves the detection accuracy, and also improves the quality and efficiency of the control valve sealing detection, making the detection more convenient and faster. The control valve is also more suitable for mass production, which improves its production efficiency and makes the control valve more economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model when it is installed and used;

[0015] Figure 2 It is a structural schematic diagram of the top seat of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the base of the utility model;

[0017] Figure 4 For this utility model Figure 1 Structural schematic diagram of the control valve seat of the middle control valve;

[0018] Figure 5 For this utility model Figure 4 A schematic diagram of the structure of the control valve core of the middle control valve;

[0019] Explanation of the markings in the figure: 1. Top seat; 11. Top plate; 12. Positioning hole; 13. Ring protrusion; 14. Bottom ring; 15. T-shaped inner cavity; 16. Horizontal hole; 17. Horizontal groove; 18. Sealing ring; 19. Sealing pad; 191. Matching hole; 2. Base; 21. Bottom plate; 22. Support platform; 23. Top rod; 231. Horizontal rod; 232. Vertical rod; 24. Compression spring; 25. Ventilation channel; 26. Gasket; 261. Gasket hole; 3. Gas power source; 31. Inlet pipeline; 32. Inlet flow meter; 4. Outlet pipeline ;41. Air outlet flow meter;5. Control valve;51. Control valve seat;52. Valve seat cavity;521. Groove;522. Lower sealing cavity;523. Inclined surface;524. Oil leakage cavity;53. Control valve core;531. Oil inlet section core;532. Lower sealing core;533. Seat surface;534. Oil leakage section core;54. Valve core seat;541. Boss hole;55. Pressure relief channel;56. Oil passage;57. Boss;58. Gasket;59. Oil passage;6. Electromagnetic actuator;61. Pin;62. Pin hole. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a control valve sealing detection device of the utility model in conjunction with the accompanying drawings.

[0021] like Figure 1-5As shown, the control valve sealing detection device of the utility model comprises a top seat 1 and a base 2, wherein the base 2 is arranged below the control valve 5, and its upper end is correspondingly connected to the bottom end of the control valve 5, and a corresponding air inlet pipeline 31 is connected to the base 2, and the base 2 is connected to a corresponding gas power source 3 through the air inlet pipeline 31, and the gas power source 3 provides gas for the detection device through the air inlet pipeline 31, and a corresponding air inlet flowmeter 32 is provided on the air inlet pipeline 31 between the base 2 and the gas power source 3, and when the gas power source 3 provides gas for the detection device, the air inlet flowmeter 32 can detect the air inlet flow entering the detection device through the air inlet pipeline 31, and the top seat 1 is arranged above the control valve 5, and its lower end is correspondingly connected to the upper end of the control valve 5, and a corresponding air outlet pipeline 4 is connected to the top seat 1, and a corresponding air outlet flowmeter 41 is provided on the air outlet pipeline 4. In this embodiment, the air outlet The flowmeter 41 is arranged at the end of the outlet pipe 4, and the gas leaked from the upper end of the control valve 5 will flow out through the outlet pipe 4 connected to the top seat 1. The outlet flow rate of the gas flowing out of the outlet pipe 4 can be detected by the outlet flowmeter 41, so that the outlet flow rate leaking from the upper end of the control valve 5 can be detected by the outlet flowmeter 41, so as to judge whether the upper end of the control valve 5 is leaking, and the intake flow rate of the intake flowmeter 32 minus the outlet flow rate of the outlet flowmeter 41 is the leakage flow rate of the lower end of the control valve 5. By observing whether there is a difference between the two, it can be known whether there is a leakage at the lower end of the control valve 5, and the size of the leakage flow rate at the lower end of the control valve 5 can be obtained according to the size of the difference. In this way, the sealing of the control valve 5 can be detected by the top seat 1 and the base 2 and the correspondingly connected intake flowmeter 32, the gas power source 3, and the outlet flowmeter 41.

[0022] The control valve 5 includes a control valve seat 51, and a corresponding electromagnetic actuator 6 is arranged on the periphery of the control valve seat 51, and the two are fixedly connected. In this embodiment, the electromagnetic actuator 6 is arranged at the lower part of the outer wall of the control valve seat 51, and corresponding threaded holes are reserved between the control valve seat 51 and the electromagnetic actuator 6. The two are fixedly installed together by bolts corresponding to the threaded holes, and corresponding pin holes 62 are reserved between the control valve seat 51 and the electromagnetic actuator 6. When the two are installed correspondingly, they are positioned by the matching of the corresponding pins 61 and the pin holes 62. The interior of the control valve seat 51 is provided with a valve seat cavity 52 connected with the upper and lower ends, and a corresponding control valve core 53 is arranged in the valve seat cavity 52. ​​The two are coaxially corresponding, and the two are divided into multiple sections with different functions from top to bottom for corresponding matching. The control valve The core 53 can move up and down in the valve seat inner cavity 52. ​​The top of the control valve core 53 is lower than the upper end surface of the control valve seat 51. The bottom of the control valve seat 51 is provided with a valve core seat 54 corresponding to the control valve core 53. The bottom end of the control valve core 53 is fixedly connected to the upper surface of the valve core seat 54. The two are integrally formed. A connected pressure relief channel 55 is provided on the side wall of the upper part of the valve seat inner cavity 52. ​​The outlet of the pressure relief channel 55 is opened on the corresponding upper outer wall of the control valve seat 51. The side wall of the control valve seat 51 is provided with an oil passage 56 connected from the top to the bottom. The pressure relief channel 55 and the oil passage 56 are not connected to each other in the side wall of the control valve seat 51. The surrounding side walls of the control valve seat 51 corresponding to the lower end of the oil passage 56 extend downward to form a boss 57. The oil passage 56 The lower port is arranged on the bottom surface of the boss 57, and the valve core seat 54 is provided with a boss hole 541 corresponding to the boss 57. The boss hole 541 is a through hole penetrating from the upper surface of the valve core seat 54 to its lower surface, and the boss 57 passes through the boss hole 541. The two are slidably connected. A corresponding gasket 58 is provided below the valve core seat 54. The gasket 58 corresponds to the part of the valve core seat 54 protruding from the lower part of the boss 57. The two form a corresponding ring in the horizontal direction. The axis of the ring formed by the gasket 58 and the boss 57 is on the extension line of the axis of the control valve core 53, which is convenient for the external positioning and installation of the control valve 5, and also improves the sealing performance of the lower port of the oil passage 56 when it is installed correspondingly to the outside. A flange connecting the oil passage 56 and the lower part of the valve seat inner cavity 52 is provided on the side wall in the middle part of the valve seat inner cavity 52. The oil through hole 59 is provided with a corresponding groove 521 on the valve seat inner cavity 52 at the corresponding connection point of the oil through hole 59. The groove 521 is an annular outer concave groove body coaxial with the valve seat inner cavity 52. ​​The groove 521 is the oil inlet section of the valve seat inner cavity 52 and the control valve core 53. The groove 521 is the oil inlet section inner cavity of the valve seat inner cavity 52. ​​The control valve core 53 corresponding to the groove 521 is the oil inlet section core body 531. The oil through channel 56 is connected with the groove 521 through the oil through hole 59. The outer diameter of the oil inlet section core body 531 is smaller than the outer diameter of the groove 521. When it is convenient to use, the high-pressure oil in the oil through channel 56 flows into the groove 521. Below the oil inlet section is the lower sealing section of the valve seat inner cavity 52 and the control valve core 53. The corresponding valve seat inner cavity 52 here is the lower sealing cavity 522.The corresponding control valve core 53 is a lower sealing core 532. The lower sealing cavity 522 and the lower sealing core 532 are matched with each other. The lower sealing cavity 522 is in a sealed state under the cooperation of the two. The sealing state of the lower sealing section will not change with the up and down movement of the control valve core 53, so that the lower part of the oil inlet section of the valve seat inner cavity 52 is always in a sealed state. The inner circle of the top surface of the groove 521 is an annular inclined surface 523 that is narrow at the top and wide at the bottom. It is located above the oil inlet section and is connected to the oil inlet section accordingly. The outer circle of the upper end of the oil inlet section core 531 is provided with a corresponding annular inclined seat surface 533 at a position corresponding to the inclined surface 523. This is the upper sealing section of the valve seat inner cavity 52 and the control valve core 53. The control valve 5 controls the inclined surface by the up and down movement of the control valve core 53. The gap between the seat surface 523 and the seat surface 533 is used to realize the sealing control of the upper part of the oil inlet section. The upper part of the upper sealing section is the valve seat inner cavity 52 and the oil leakage section of the control valve core 53. The corresponding valve seat inner cavity 52 here is the oil leakage chamber 524. The inlet of the pressure relief channel 55 is arranged on the side wall of the oil leakage chamber 524. In this embodiment, the inlet of the pressure relief channel 55 is arranged on the side wall of the upper part of the oil leakage chamber 524. The control valve core 53 corresponding to the oil leakage chamber 524 is the oil leakage section core body 534. The outer diameter of the oil leakage section core body 534 is smaller than the radial dimension of the oil leakage chamber 524, which is convenient for the flow of high-pressure oil in this section when used. When the control valve 5 is installed and used on the injector, the upper port of its oil passage 56 is correspondingly connected to the high-pressure oil pipeline of the injector, and the lower port of the oil passage 56 is connected to the The oil outlet pipeline of the injector is connected accordingly, and the control valve 5 is connected to the pressure relief passage of the injector through the pressure relief passage 55. Under normal conditions, the electromagnetic actuator 6 is not energized, and the control valve core 53 is in a low position due to the upper pressure given by the injector. At this time, the inclined surface 523 and the seat surface 533 are in a separated state, and there is a certain gap between the two. The upper sealing section is in a non-sealed state. The high-pressure oil in the oil passage 56 of the injector flows into the groove 521 through the oil hole 59. Because the lower sealing section is always in a sealed state, no matter how the control valve core 53 moves up and down, the high-pressure oil in the groove 521 will not flow downward. At this time, the high-pressure oil in the groove 521 can only flow to the oil leakage section above the valve seat inner cavity 52 through the gap between the inclined surface 523 and the seat surface 533. Finally The oil pressure in the oil pump 521 is regulated by the pressure relief passage 55. ...When the control valve 5 is working, the upper sealing section of the control valve 5 is controlled by the up and down movement of the control valve core 53 in cooperation with the lower sealing section to control the change of the state of the upper sealing section and thus control whether the injector sprays oil. The sealing performance of the upper and lower sealing sections jointly affects the working performance of the control valve 5. During detection, the sealing performance of the upper and lower ends of the control valve 5 needs to be tested simultaneously.

[0023] The base 2 includes a bottom plate 21, and a corresponding support platform 22 is provided above the bottom plate 21. The support platform 22 is a barrel-shaped barrel with an opening at the upper end. The bottom surface of the support platform 22 is fixedly connected to the upper surface of the base 2, and the two are integrally formed. The upper port of the support platform 22 is installed correspondingly to the lower end of the control valve 5, and its upper surface is correspondingly fitted on the annular lower surface composed of the gasket 58 and the boss 57 of the control valve 5. The inner cavity of the support platform 22 is provided with a corresponding push rod 23 and a compression spring 24. The compression spring 24 is arranged on the bottom surface of the inner cavity of the support platform 22, and the push rod 23 is correspondingly installed above the compression spring 24. The cross section of the push rod 23 is a cross shape, and its cross bar 231 is arranged above the compression spring 24. The outer size of the cross bar 231 is larger than the inner diameter of the compression spring 24. In this embodiment, the cross bar 231 The outer size corresponds to the outer diameter of the compression spring 24, and both are smaller than the inner cavity size of the support platform 22. The top end of the compression spring 24 is against the lower end surface of the cross bar 231. The cross bar 231 and the vertical bar 232 are integrally formed and fixedly connected. The push rod 23 is mounted on the top of the compression spring 24 through the cross bar 231. The lower end of the vertical rod 232 of the push rod 23 corresponds to the inner circle of the compression spring 24. The lower end length of the vertical rod 232 is less than the height of the compression spring 24. During the inspection and installation, the top surface of the vertical rod 232 is against the lower surface of the valve core seat 54, and the top end of the vertical rod 232 penetrates the center of the gasket 58 and is against the bottom of the valve core seat 54. In this embodiment, the top surface of the push rod 23 is attached to the center position of the lower surface of the valve core seat 54, the inner cavity of the support platform 22 and the axis of the push rod 23 and the compression spring 24 They are all on the lower end extension line of the axis of the control valve core 53. The compression spring 24 applies force to the push rod 23 through the cross rod 231, and then provides an upward supporting force for the control valve 5 through the push rod 23. In this process, the vertical rod 232 of the push rod 23 provides a guiding effect, so that the positioning of the base 2 and the control valve 5 for coordinated installation is more convenient, and thus the installation between the two is faster. At the same time, it is more convenient for the base 2 to apply force to the control valve 5 during detection. A ventilation channel 25 corresponding to the oil passage 56 of the control valve 5 is provided on the side wall of the support platform 22. The base 2 is connected to the corresponding air inlet pipeline 31 through the ventilation channel 25. In this embodiment, the air inlet of the ventilation channel 25 is provided on the outer side wall of the support platform 22, and the air inlet pipeline 31 is connected to the air inlet of the ventilation channel 25 The air outlet of the ventilation channel 25 is arranged on the top surface of the side wall corresponding to the support platform 22. During installation and inspection, the top surface of the support platform 22 fits with the lower end surface of the ring composed of the gasket 58 and the boss 57, and the air outlet of the ventilation channel 25 is correspondingly connected to the lower end of the oil passage 56 on the lower end surface of the boss 57. The gas in the intake pipeline 31 enters the oil passage 56 through the ventilation channel 25. A corresponding gasket ring 26 is provided between the base 2 and the control valve 5. The gasket ring 26 is a corresponding ring. The upper surface of the support platform 22 fits on its lower surface, and its upper surface fits on the lower end surface of the ring composed of the gasket 58 and the boss 57. A through gasket ring hole 261 is provided on the side wall of the gasket ring 26. The upper opening of the gasket ring hole 261 corresponds to the lower end of the oil passage 56.The lower opening of the gasket hole 261 corresponds to the gas outlet of the vent channel 25. The gas in the vent channel 25 passes into the oil passage 56 through the gasket hole 261. The gasket 26 is made of airtight elastic material and has good sealing performance. It provides a sealing effect for the corresponding installation between the base 2 and the control valve 5 to prevent the gas in the vent channel 25 from leaking when flowing into the oil passage 56 due to the poor sealing performance of the corresponding connection between the vent channel 25 and the oil passage 56, thereby affecting the detection of the overall sealing performance of the control valve 5. The use of the gasket 26 improves the accuracy of the detection of the control valve 5.

[0024] The top seat 1 includes a top plate 11, and the upper end surface of the control valve seat 51 is correspondingly fitted on the lower surface of the top plate 11. A positioning hole 12 corresponding to the pin 61 of the control valve 5 is provided on the lower surface of the top seat 1. When the top seat 1 and the control valve 5 are installed and tested accordingly, the upper end of the pin 61 penetrates into the positioning hole 12, and the depth of the positioning hole 12 is greater than the height difference between the top end of the pin 61 and the upper end surface of the control valve seat 51. Through the cooperation of the pin 61 and the positioning hole 12, the assembly of the top seat 1 and the control valve 5 can be made faster and more accurate, thereby improving the efficiency of the test. A downward annular protrusion is provided on the lower surface of the top seat 1, which is a ring protrusion 13. The inner ring size of the ring protrusion 13 is larger than the outer wall of the control valve seat 51, and the bottom end of the ring protrusion 13 extends toward its inner ring to form a corresponding bottom ring 14. The inner circle of the bottom ring 14 corresponds to the outer side wall of the upper part of the control valve seat 51. The top seat 1, the annular protrusion 13 and the bottom ring 14 form a T-shaped inner cavity 15 with a downward opening and a T-shaped cross section. When the top seat 1 and the control valve 5 are installed for detection, the upper end of the control valve seat 51 extends into the T-shaped inner cavity 15. At this time, the upper end of the bottom ring 14 is lower than the outlet of the pressure relief channel 55 on the control valve seat 51. During detection, if gas flows out from the upper end of the control valve 5, the outflowing gas will pass into the T-shaped inner cavity 15 through the pressure relief channel 55. A transverse hole 16 connected to the T-shaped inner cavity 15 is provided on the side wall of the annular protrusion 13. The outer opening of the transverse hole 16 is opened on the outer side wall of the annular protrusion 13. The outer opening of the transverse hole 16 corresponds to the inlet end of the outlet pipe 4. The top seat 1 is connected to the outlet pipe 4 through the transverse hole 16. The gas introduced into the T-shaped inner cavity 15 flows into the gas outlet pipe through the transverse hole 16, and can then be detected by the gas outlet flow meter 41. An annular transverse groove 17 is provided on the inner side wall of the bottom ring 14, and a corresponding sealing ring 18 is provided in the annular transverse groove 17. The sealing ring 18 improves the sealing between the bottom ring 14 and the side wall of the control valve seat 51, thereby preventing the gas in the T-shaped inner cavity 15 from escaping outward through the gap between the two, so that the sealing detection of the upper end of the control valve 5 is more accurate. A corresponding sealing pad 19 is provided between the top seat 1 and the control valve 5. The sealing pad 19 is an elastic sealing plate. The upper surface of the sealing pad 19 is attached to the lower surface of the top plate 11, and the upper end surface of the control valve seat 51 is attached to the lower surface of the sealing pad 19. There is a sealing pad 19 on the sealing pad 19. The matching hole 191 corresponding to the positioning hole 12, during installation, the top end of the pin 61 passes through the matching hole 191 and then into the positioning hole 12. During detection and installation, an external pressure device is connected above the top seat 1, so that the sealing pad 19 is pressed by the top seat 1 between the lower surface of the top plate 11 and the upper end surface of the control valve seat 51, thereby sealing the upper port of the oil passage 56 to prevent the gas in the oil passage 56 from leaking from its upper port into the T-shaped inner cavity 15 during monitoring, thereby affecting the detection precision of the outlet gas flowmeter 41 and affecting the detection accuracy. In this embodiment, the center lines of the top plate 11, the annular convexity 13, the bottom ring 14 and the T-shaped inner cavity 15 all coincide with the axis of the control valve 5, so that the force applied above the control valve 5 during detection is more balanced and the detection accuracy is higher.

[0025] When in use, the top seat 1 and the base 2 are respectively installed at the upper and lower ends of the control valve 5. Under the action of the compression spring 24, the control valve core 53 of the control valve 5 is pressed tightly against the control valve seat 51, and the inclined surface 523 and the seat surface 533 are in a tightly fitted state. At this time, the gas power source 3 passes gas into the control valve 5 through the intake pipe 31, and the intake flow of the gas is monitored in real time by the intake flow meter 32 in the intake pipe 31. After passing through the ventilation channel 25 of the base 2, the gas enters the oil passage 56 of the control valve 5 through the gasket hole 261. The gas flowing into the oil passage 56 has two flow directions, one of which is to flow toward its upper port. Since the upper end of the oil passage 56 is sealed by the sealing pad 19, the gas cannot flow out in this direction. The other direction is to flow into the groove 521 of the valve seat inner cavity 52 through the oil hole 59. The gas entering the groove 521 can leak out through the lower sealing section or the upper sealing section. If there is gas leakage through the upper sealing section, the leaked gas will flow into the T-shaped inner cavity 15 through the oil leakage cavity 524 and the pressure relief channel 55. The gas in the T-shaped inner cavity 15 flows into the outlet pipe through the transverse hole 16 and can be detected by the outlet flow meter 41. The outlet flow rate detected by the outlet flow meter 41 is the upper sealing section of the control valve 5. Leakage amount 2. Under normal conditions, the upper sealing section and the lower sealing section of the control valve 5 are both in a sealed state, and there will be no gas leakage at both ends. The values ​​of the inlet flow rate and the outlet flow rate are both zero. If the control valve 5 leaks, the inlet flow rate introduced through the intake pipe 31 is the overall leakage amount 1 of the control valve 5. There will be the following three situations: 1) The upper sealing section of the control valve 5 does not leak, and only the lower sealing section leaks. The leakage amount of the lower sealing section is leakage amount 3. At this time, the value of the leakage amount 2 of the control valve 5 is zero, and the overall leakage amount 1 is equal to the leakage amount 3 of the lower sealing section. By reading the value of the overall leakage amount 1, The leakage amount three can be obtained; 2) only the upper sealing section of the control valve 5 leaks, while its lower sealing section does not leak. At this time, the leakage amount three is zero, and the overall leakage amount one of the control valve 5 is equal to the leakage amount two, which can be directly read by the intake flow meter 32 or the outlet flow meter 41; 3) both the upper sealing section and the lower sealing section of the control valve 5 leak. At this time, the value of the overall leakage amount one of the control valve 5 is equal to the sum of the leakage amount two and the leakage amount three. The value of the leakage amount three can be obtained by subtracting the leakage amount two from the overall leakage amount one. As mentioned above, the sealing performance of the control valve 5 is accurately detected by the sealing performance detection device of the control valve 5 of the utility model.

[0026] The control valve sealing detection device of the utility model realizes independent detection of the sealing of the control valve 5, and can simultaneously detect the sealing of two places inside the control valve 5 separately, so that the sealing detection of the control valve 5 is more convenient, faster, more accurate, and of higher quality. At the same time, it not only improves the accuracy of the sealing detection of the control valve 5, but also makes the cost of the sealing detection of the control valve 5 lower, improves its detection efficiency, and further improves the production efficiency of the control valve 5, making it more suitable for mass production and more economical.

[0027] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A control valve sealing detection device, characterized in that: The invention comprises a top seat (1) and a base (2); the base (2) is arranged below the control valve (5), and its upper end is correspondingly connected to the lower end of the control valve (5); the base (2) is connected to a corresponding gas power source (3) through a connected air intake pipeline (31); a corresponding air intake flow meter (32) is provided on the air intake pipeline (31); the top seat (1) is arranged above the control valve (5), and its lower end is correspondingly connected to the upper end of the control valve (5); a corresponding air outlet pipeline (4) is connected to the top seat (1); a corresponding air outlet flow meter (41) is provided on the air outlet pipeline (4); and the sealing performance of the control valve (5) is detected through the mutual cooperation of the top seat (1) and the base (2) and their corresponding connected air intake flow meter (32), the gas power source (3), and the air outlet flow meter (41).

2. The control valve sealing detection device according to claim 1, characterized in that: The control valve (5) comprises a control valve seat (51), a corresponding electromagnetic actuator (6) is fixedly mounted on the outer periphery of the side wall of the control valve seat, and the two are positioned in coordination with each other through a reserved pin hole (62) using a corresponding pin (61). The control valve seat (51) is provided with a valve seat inner cavity (52) connected at the upper and lower ends, and the side wall of the control valve seat (51) is provided with an oil passage (56) connected from the top to the bottom thereof. A corresponding control valve core (53) movable up and down is provided in the valve seat inner cavity (52), and the top end of the control valve core (53) is lower than the upper end surface of the control valve seat (51). The valve seat inner cavity (52) and the control valve core (53) are divided into a plurality of sections correspondingly coordinated from top to bottom, which are: an oil drain section, an upper sealing section, an oil inlet section and a lower sealing section, and the oil inlet section corresponds to An oil hole (59) is provided on the side wall of the inner cavity (52) of the valve seat so as to communicate with the oil passage (56). The control valve (5) adjusts the state of the upper sealing section by moving the control valve core (53) up and down in cooperation with the lower sealing section. A valve core seat (54) fixedly connected to the control valve core (53) is provided at the bottom of the control valve seat (51). The side walls of the control valve seat (51) corresponding to the lower end of the oil passage (56) extend downward to form a boss (57). The lower end of the oil passage (56) is provided on the bottom surface of the boss (57). A boss hole (541) corresponding to the boss (57) is provided on the valve core seat (54). The boss (57) passes through the boss hole (541) and forms a ring with a corresponding gasket (58) provided below the valve core seat (54).

3. The control valve sealing detection device according to claim 2, characterized in that: The base (2) comprises a bottom plate (21), a barrel-shaped support platform (22) with an opening facing upward is provided above the bottom plate (21), the bottom surface of the support platform (22) is fixedly connected to the upper surface of the base (2), the upper surface of the upper port of the support platform (22) is correspondingly attached to the annular lower surface formed by the gasket (58) and the boss (57) of the control valve (5), the inner cavity of the support platform (22) is provided with a corresponding push rod (23) and a compression spring (24), and the compression spring (24) is arranged on the bottom surface of the inner cavity of the support platform (22). The push rod (23) is correspondingly installed above the compression spring (24). Under the action of the compression spring (24), the top end of the push rod (23) abuts against the lower surface of the valve core seat (54). A ventilation channel (25) is provided on the side wall of the support platform (22). The air inlet of the ventilation channel (25) is arranged on the outer wall of the support platform (22) and is correspondingly connected to the air inlet pipeline (31). The air outlet of the ventilation channel (25) is arranged on the top surface of the corresponding side wall of the support platform (22) and is correspondingly connected to the lower end of the oil passage (56).

4. The control valve sealing detection device according to claim 3, characterized in that: A corresponding annular gasket (26) is provided between the base (2) and the control valve (5); the upper surface of the support platform (22) is fitted on the lower surface of the gasket (26); the upper surface of the gasket (26) is fitted on the lower end surface of the ring formed by the gasket (58) and the boss (57); a through gasket hole (261) is provided on the side wall of the gasket (26); the upper opening of the gasket hole (261) corresponds to the lower end of the oil passage (56); and the lower opening of the gasket hole (261) corresponds to the air outlet of the air passage (25).

5. The control valve sealing detection device according to claim 3, characterized in that: The cross section of the push rod (23) is cross-shaped, and its cross rod (231) is arranged above the compression spring (24). The outer dimension of the cross rod (231) is larger than the inner diameter dimension of the compression spring (24). The top end of the compression spring (24) abuts against the lower end surface of the cross rod (231). The cross rod (231) and the vertical rod (232) are integrally formed. The lower end of the vertical rod (232) correspondingly penetrates into the inner circle of the compression spring (24). The lower end length of the vertical rod (232) is smaller than the height of the compression spring (24). The push rod (23) is mounted above the compression spring (24) through the cross rod (231). The top end of the vertical rod (232) penetrates into the center of the gasket (58) and its top surface abuts against the lower surface of the valve core seat (54).

6. The control valve sealing detection device according to claim 2, characterized in that: The top seat (1) comprises a top plate (11), the upper end surface of the control valve seat (51) is correspondingly attached to the lower surface of the top plate (11), a positioning hole (12) corresponding to the pin (61) of the control valve (5) is provided on the lower surface of the top seat (1), the depth of the positioning hole (12) is greater than the height difference between the top end of the pin (61) and the upper end surface of the control valve seat (51), and a downward annular protrusion (13) is provided on the lower surface of the top seat (1), the bottom end of the annular protrusion (13) extends toward its inner circle to form an inner circle and an outer side of the control valve seat (51). The top seat (1), the annular protrusion (13) and the bottom ring (14) form a T-shaped inner cavity (15) opening downwards. The upper end of the control valve seat (51) extends into the T-shaped inner cavity (15). The upper end of the bottom ring (14) is lower than the outlet of the pressure relief channel (55) on the control valve seat (51). The side wall of the annular protrusion (13) is provided with a transverse hole (16) connected to the T-shaped inner cavity (15). The outer outlet of the transverse hole (16) provided on the outer side wall of the annular protrusion (13) is correspondingly connected to the air outlet pipeline (4).

7. The control valve sealing detection device according to claim 6, characterized in that: A corresponding sealing pad (19) is provided between the top seat (1) and the control valve (5), the upper surface of which is in contact with the lower surface of the top plate (11), and the upper end surface of the control valve seat (51) is in contact with the lower surface of the sealing pad (19). The sealing pad (19) is provided with a matching hole (191) corresponding to the positioning hole (12). The sealing pad (19) is pressed by the top seat (1) against the upper end surface of the control valve seat (51), so that the upper end of the oil passage (56) is sealed.

8. The control valve sealing detection device according to claim 6, characterized in that: An annular transverse groove (17) is provided on the inner side wall of the bottom ring (14), and a corresponding sealing ring (18) is provided in the annular transverse groove (17).

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