CN114060604A - Leakage detection device and detection method of single-breath valve - Google Patents
Leakage detection device and detection method of single-breath valve Download PDFInfo
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- CN114060604A CN114060604A CN202111489172.6A CN202111489172A CN114060604A CN 114060604 A CN114060604 A CN 114060604A CN 202111489172 A CN202111489172 A CN 202111489172A CN 114060604 A CN114060604 A CN 114060604A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0075—For recording or indicating the functioning of a valve in combination with test equipment
- F16K37/0091—For recording or indicating the functioning of a valve in combination with test equipment by measuring fluid parameters
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Abstract
The invention discloses a leakage detection device and a detection method of a single-expiratory valve, and belongs to the field of leakage detection of single-expiratory valves. The annular detection device comprises a pressure trigger circuit which is arranged between the valve disc and the valve seat and is of a plurality of fan-shaped structures forming an annular structure, wherein the pressure trigger circuit is conducted when being squeezed by pressure, and is disconnected when the pressure is lower than a threshold value; the pressure state that the valve disc receives is monitored in real time by utilizing the pressure trigger circuits with the fan-shaped structures, so that whether the pressure received by the valve disc is balanced or not in the closed state is judged, if the pressure trigger circuit with the fan-shaped structures is in the open circuit condition, the valve disc of the single-breathing valve is judged to leak, and meanwhile, a leakage area is judged according to the position on the valve disc corresponding to the open circuit pressure trigger circuit. The single-breath valve has the advantages of simple structure and convenience in use, can monitor whether leakage occurs in the single-breath valve in real time, and cannot interfere with normal use of the single-breath valve.
Description
Technical Field
The invention relates to a leakage detection device and a detection method of a single-expiratory valve, belonging to the field of leakage detection of the single-expiratory valve.
Background
The single-breathing valve is a valve for preventing the tank expansion risk of a storage tank for storing products such as petroleum, chemical engineering and the like. When the pressure in the storage tank is higher than the set pressure of the valve, the valve is opened to release redundant steam; when the pressure in the storage tank is lower than the set pressure of the valve, the valve is in a closed state under the action of the gravity of the valve block. After the valve is used for a certain time, the leakage problem often exists in the single-breath valve, and the leakage of the valve not only can cause the loss of stock solution in the storage tank, but also can cause certain pollution to the environment.
The existing method for solving the leakage of the single-exhalation valve comprises the following steps: in a certain period, the valves are intensively disassembled from the storage tank, and a special detection device is utilized to intensively detect whether the valves leak or not. However, according to the existing detection data, only a few valves have leakage problems, and most valves can work normally. This not only causes waste of manpower and material resources, but also causes a certain economic loss, and may also cause damage to the normal valves in the process of carrying and installing the valves.
Disclosure of Invention
The technical purpose is as follows: aiming at the defects of the prior art, the leakage detection device and the detection method of the single-breath valve are simple in structure and convenient to use, do not interfere the normal work of the single-breath valve, and can monitor whether the leakage problem is generated or not in real time.
The technical content is as follows: in order to achieve the technical purpose, the leakage detection device of the single-exhalation valve comprises an annular detection device arranged between a valve disc and a valve seat, wherein the annular detection device comprises a pressure trigger circuit which forms a plurality of fan-shaped structures of an annular structure, the pressure trigger circuit is conducted when the pressure trigger circuit is extruded by pressure, and the pressure trigger circuit is disconnected when the pressure is lower than a threshold value; the pressure state that the valve disc receives is monitored in real time by utilizing the pressure trigger circuits with the fan-shaped structures, so that whether the pressure received by the valve disc is balanced or not in the closed state is judged, if the pressure trigger circuit with the fan-shaped structures is in the open circuit condition, the valve disc of the single-breathing valve is judged to leak, and meanwhile, a leakage area is judged according to the position on the valve disc corresponding to the open circuit pressure trigger circuit.
Further, the leak detection device of the single exhalation valve according to claim, characterized in that: the device comprises a simulated air inlet generating system, a leakage detecting system and a display system; the detected single-breath valve comprises a lower valve body, a valve seat, a valve rod group, a valve cover and an upper valve body; the simulated air inlet generating system is hermetically connected with an air inlet of the single-expiratory valve, the leakage detection system is arranged in the single-expiratory valve, and the display system is connected with the leakage detection system and displays data of the leakage detection system; the valve seat is fixed in a round hole at the lower end of the upper valve body; the lower valve body is connected with the lower end of the upper valve body through a bolt; the valve rod group is placed on the valve seat; the valve cover is connected with the upper end of the upper valve body in a bolt connection mode; the axes of the lower valve body, the valve seat, the valve rod group, the valve cover and the upper valve body are mutually overlapped;
the simulated air inlet generation system comprises an air compressor, a pressure stabilizing tank, a pressure regulating valve and a flange plate which are connected in series by utilizing an air transmission pipeline, wherein the flange plate is connected with an air inlet of a single exhalation valve in a sealing way;
the leakage detection system comprises a valve rod group arranged on a valve seat of the single-exhalation valve; the valve rod group comprises a valve rod with a hollow structure, a valve disc matched with a valve seat is arranged on the valve rod, an annular detection device matched with the valve seat is fixed below the valve disc through a locking nut and a pressing sheet, a sealing film is arranged between the annular detection device and the pressing sheet, a valve cap used for covering the valve seat is arranged above the valve disc, and a balancing weight is arranged above the valve cap through a fixing ring;
the annular detection device is formed by surrounding a plurality of pressure trigger circuits with sector structures, and is turned on when the pressure applied on the pressure trigger circuits exceeds a threshold value and is turned off when the pressure is lower than the threshold value, so that the gas pressure applied on different areas on the surface of the annular detection device is detected
And the valve cover is provided with a conductive limiting structure for limiting the sliding position of the end part of the valve rod.
Further, the upper portion and the lower part of hollow structure's valve rod are equipped with a circle round hole and lower round hole respectively around the lateral wall, and wherein the hollow structure intercommunication of valve rod is gone up round hole and lower round hole, and wherein cyclic annular detection device is connected with the wire, and the wire passes the hollow structure of valve rod from lower round hole and wears out from last round hole at last and electrically conducts limit structure contact, is connected with display system through electrically conducting limit structure, and display system includes controller and the display module that connects in order.
Furthermore, the annular detection device comprises a lower circuit layer, a partition plate layer and an upper circuit layer which are of an annular structure; the front surface of the lower circuit layer is connected with the back surface of the partition plate layer in an adhesive manner, the front surface of the partition plate layer is connected with the back surface of the upper circuit layer in an adhesive manner, the back surface of the lower circuit layer is the lower end surface of the annular detection device, and the front surface of the upper circuit layer is the upper end surface of the annular detection device.
Furthermore, a plurality of groups of pressure contact circuits with fan-shaped structures are respectively arranged at equal included angles on the lower circuit layer, fan-shaped hollows matched with the number of the contact circuits are formed in the partition plate layer, and conducting contacts matched with the number and the positions of the pressure contact circuits with the fan-shaped structures arranged on the upper surface of the lower circuit layer are arranged on the lower surface of the upper circuit layer, so that the contacts of the upper circuit layer can be in contact with and conducted with the fan-shaped pressure contact circuits of the lower circuit layer through the fan-shaped holes in the partition plate layer; each pressure contact circuit and the conducting contact form a pressure trigger circuit; the partition plate layer and the upper circuit layer are made of elastic materials, when the upper circuit layer is pressed from bottom to top, the conducting contact area is arranged under the action of pressure to deform so as to be in contact with the pressure contact circuit of the upper circuit layer, so that the circuit is conducted, and if the pressure is reduced, the conducting contact is rebounded so as to be separated from the pressure contact circuit, so that the circuit is disconnected; the pressure trigger circuits are connected with wires, and each group is based on actual needs; the pressure trigger circuits are all connected with a lead, or a plurality of groups of pressure trigger circuits are connected in series and are connected with a lead together.
Furthermore, the conductive limiting structure comprises a plurality of conductive bearing bushes arranged on the outer side of the end part of the valve rod and a plurality of conductive sleeves arranged at the connecting part of the valve cover and the valve rod, and a group of balls for conducting electricity are arranged between each conductive bearing bush and the conductive sleeve at the corresponding position; the ball bearing is provided with a blocking block for blocking a gap below, the blocking block is inserted into the conductive sleeve in a fan-shaped protrusion mode to prevent the ball bearing from falling, a conductive bearing bush is arranged on the outer side of each upper round hole, each conductive bearing bush is connected with a lead, each conductive sleeve sends a detection signal of the annular detection device to the display system through a signal line, and the valve cover is provided with a plurality of round holes for the signal line to penetrate out.
Further, electrically conductive axle bush is the arc structure, and the junction of electrically conductive axle bush and valve rod is established to the indent structure equally, and the arc sunk structure that equally is matchd between electrically conductive sleeve and the valve gap makes electrically conductive sleeve and relative electrically conductive axle bush form the tube-shape structure that matches so that the ball that a set of and diameter that prevents to set up between the two matches produces and rocks thereby influence electrically conductive effect.
A method for detecting a leak detection device of a single-exhalation valve comprises the following steps:
when the single exhalation valve does not leak, the annular detection device below the valve disc is tightly buckled with the valve seat under the action of the gravity of the balancing weight, all conducting contacts of an upper circuit layer of the annular detection device are correspondingly contacted with all fan-shaped pressure contact circuits on a lower circuit layer, circuits on the lower circuit layer are conducted, and the annular detection device outputs pressure signals to the display system through a lead and a conducting mechanism in sequence;
when the single-breath valve leaks, part area of the valve disc is impacted by gas pressure in the valve to move upwards to drive the sealing film to separate from the valve seat, the separation position of the sealing film and the valve seat is the valve leakage position, part of the annular detection device corresponding to the region of the leakage position is not acted by gravity any more, the upper circuit layer corresponding to the region cannot be in contact with the fan-shaped pressure contact circuit on the lower circuit layer corresponding to the position due to insufficient pressure, the fan-shaped pressure contact circuit which cannot be conducted is broken, the corresponding lead and the signal wire cannot transmit effective signals, and the display system judges the region position where leakage occurs through the region without the pressure signals.
Has the advantages that: the device and the detection method realize that the annular detection device is arranged on the valve disc, thereby realizing the real-time detection of whether the single-breath valve leaks or not, realizing the real-time acquisition of electric signals related to leakage on the premise of not influencing the normal work of the valve and facilitating the leakage detection of the valve; meanwhile, the valve rod is connected with the valve cover through the ball, so that the problem that the valve rod group inclines or rotates in the opening process of the valve is avoided, and the stability of opening and closing of the valve is ensured; whether the valve leaks or not can be detected by the annular detection device, meanwhile, the leakage position of the valve can be roughly analyzed, and the leakage position is displayed by the display module, so that the leakage position can be quickly positioned conveniently. Meanwhile, the pressure contacts in the annular detection device are connected in a matrix mode, so that the number of signal output wires is reduced, and the complexity of the structure is reduced.
Drawings
FIG. 1 is a schematic view of a leak detection device of a single exhalation valve of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at I;
FIG. 3 is a cross-sectional view of section A-A of FIG. 1;
FIG. 4 is a schematic diagram of a single exhalation valve stem assembly of the present invention;
FIG. 5 is an isometric view of a valve stem of the present invention;
figure 6 is an isometric view of an electrically conductive bearing shell according to the present invention;
FIG. 7 is an isometric view of a valve cover according to the present invention;
FIG. 8 is a front view of the valve cover of the present invention;
FIG. 9 is a bottom view of the valve cover of the present invention;
FIG. 10 is an isometric view of a conductive sleeve of the present invention;
FIG. 11 is an isometric view of a stop block of the present invention;
FIG. 12 is a schematic view of the ring detection device according to the present invention;
FIG. 13 is a schematic diagram of a lower circuit layer according to the present invention;
FIG. 14 is a schematic structural view of a separator layer structure according to the present invention;
FIG. 15 is a schematic structural diagram of an upper circuit layer according to the present invention;
in the figure: 1-air compressor, 2-gas transmission pipeline, 3-surge tank, 4-pressure regulating valve, 5-flange plate, 6-lower valve body, 7-valve seat, 8-valve rod group, 81-fixing ring, 82-balancing weight, 83-valve cap, 84-valve disc, 85-pressing sheet, 86-locking nut, 87-valve rod, 871-conductive bearing bush, 872-lower round hole, 873-upper round hole, 88-annular detection device, 881-upper circuit layer, 882-partition plate layer, 883-lower circuit layer, 89-sealing film, 810-lead, 9-valve cap, 91-ball, 92-conductive sleeve, 93-blocking block, 94-round hole, 95-fan-shaped hole, 10-signal line, 11-controller, 12-display Module, 13-Upper valve body
Detailed Description
The implementation of the present invention is further described with reference to the accompanying drawings:
as shown in fig. 1, the leak detection device of the single-exhalation valve of the present invention includes an annular detection device leak 88 disposed between the valve disc leak 84 and the valve seat leak 7, the annular detection device leak 88 includes a pressure trigger circuit having a plurality of fan-shaped structures constituting an annular structure, the pressure trigger circuit is turned on when the pressure trigger circuit is pressed by pressure, and is turned off when the pressure is lower than a threshold value; the pressure state of the valve disc leakage 84 leakage is monitored in real time by utilizing a plurality of fan-shaped pressure trigger circuits, so that whether the pressure of the valve disc leakage 84 leakage in the closed state is balanced or not is judged, if the fan-shaped pressure trigger circuits are in an open circuit state, the leakage of the valve disc leakage 84 leakage part of the single-breathing valve at the moment is judged, and meanwhile, the leakage area is judged according to the position of the valve disc leakage 84 leakage corresponding to the open circuit pressure trigger circuits.
As shown in fig. 4, the leak detection apparatus of the single exhalation valve of the present invention includes a simulated intake air generation system, a leak detection system, and a display system; the detected single-exhalation valve comprises a lower valve body 6, a valve seat 7, a valve rod group 8, a valve cover 9 and an upper valve body 13; the simulated air inlet generating system is hermetically connected with an air inlet of the single-expiratory valve, the leakage detection system is arranged in the single-expiratory valve, and the display system is connected with the leakage detection system and displays data of the leakage detection system; the valve seat 7 is fixed in a circular hole at the lower end of the upper valve body 13; the lower valve body 6 is connected with the lower end of the upper valve body 13 through a bolt; the valve rod group 8 is placed on the valve seat 7; the valve cover 9 is connected with the upper end of the upper valve body 13 in a bolt connection mode; the axes of the lower valve body 6, the valve seat 7, the valve rod group 8, the valve cover 9 and the upper valve body 13 are mutually overlapped; the simulated air inlet generation system comprises an air compressor 1, a pressure stabilizing tank 3, a pressure regulating valve 4 and a flange plate 5 which are connected in series by a gas transmission pipeline 2, wherein the flange plate 5 is connected with an air inlet of a single exhalation valve in a sealing way; the leakage detection system comprises a valve rod group 8 arranged on a valve seat 7 of the single-exhalation valve; the valve rod group 8 comprises a valve rod 87 with a hollow structure, the valve rod 87 is provided with a valve disc 4 matched with the valve seat 7, an annular detection device 88 matched with the valve seat 7 is fixed below the valve disc 4 through a locking nut 86 and a pressing sheet 85, a sealing film 89 is arranged between the annular detection device 88 and the pressing sheet 85, a valve cap 83 used for covering the valve seat 7 is arranged above the valve disc 4, and a balancing weight 82 is arranged above the valve cap 83 through a fixing ring 81;
the ring-shaped detection device 88 is formed by surrounding a plurality of sector-shaped pressure trigger circuits, and is turned on when the pressure applied on the pressure trigger circuits exceeds a threshold value and is turned off when the pressure is lower than the threshold value, so that the gas pressure applied on different areas on the surface of the pressure trigger circuits is detected
And the valve cover 9 is provided with a conductive limiting structure for limiting the sliding position of the end part of the valve rod 87.
As shown in fig. 5, the upper part and the lower part of the valve rod 87 of the hollow structure are respectively provided with a circle of round holes 873 and a circle of round holes 872 around the side wall, wherein the hollow structure of the valve rod 87 is communicated with the upper round hole 873 and the lower round hole 872, the annular detection device 88 is connected with a lead 810, the lead 810 penetrates through the hollow structure of the valve rod 87 from the lower round hole 872 and finally penetrates out from the upper round hole 873 to be in contact with the conductive limiting structure, and is connected with a display system through the conductive limiting structure, and the display system comprises a controller 11 and a display module 12 which are connected in sequence.
As shown in fig. 12, the ring detector 88 includes a lower circuit layer 883, a spacer layer 882, and an upper circuit layer 881 in a ring structure; wherein the front surface of the lower circuit layer 883 is adhesively connected to the back surface of the spacer layer 882, the front surface of the spacer layer 882 is adhesively connected to the back surface of the upper circuit layer 881, the back surface of the lower circuit layer 883 is the lower end surface of the annular detection device 88, and the front surface of the upper circuit layer 881 is the upper end surface of the annular detection device 88.
As shown in fig. 13, 14 and 15, a plurality of sets of sector-shaped pressure contact circuits are respectively disposed at equal angles on the lower circuit layer 883, a sector hollow matched with the number of the contact circuits is opened on the partition layer 882, and a conducting contact matched with the number and position of the plurality of sets of sector-shaped pressure contact circuits disposed on the upper surface of the lower circuit layer 883 is disposed on the lower surface of the upper circuit layer 881, so as to ensure that the contact of the upper circuit layer 881 can be contacted and conducted with the sector-shaped pressure contact circuits of the lower circuit layer 883 through the sector hole 95 on the partition layer 882; each pressure contact circuit and the conducting contact form a pressure trigger circuit; the partition layer 882 and the upper circuit layer 881 are both made of elastic materials, when the upper circuit layer 881 is pressed from bottom to top, the conducting contact area is arranged under the action of pressure to deform so as to be in contact with the pressure contact circuit of the upper circuit layer 881, so that the circuit is conducted, and if the pressure is reduced, the conducting contact is rebounded so as to be separated from the pressure contact circuit to realize circuit breaking; the pressure trigger circuits are connected with leads 810, and each group is according to actual needs; the pressure trigger circuits are all connected with a lead wire 810, or a plurality of groups of pressure trigger circuits are connected in series and are connected with a lead wire 810 together.
As shown in fig. 2 and 3, the conductive limiting structure comprises a plurality of conductive bearing bushes 871 arranged at the outer sides of the ends of the valve rod 87 and a plurality of conductive sleeves 92 arranged at the joints of the valve cover 9 and the valve rod 87, and a set of balls 91 for conducting electricity are arranged between each conductive bearing bush 871 and the corresponding conductive sleeve 92; a blocking block 93 for blocking the gap is arranged below the ball 91, the blocking block 93 is shown in fig. 11, a fan-shaped protrusion of the blocking block 93 is inserted into the conductive sleeve 92 to prevent the ball 91 from falling off, a conductive bearing 871 is arranged outside each upper circular hole 873, each conductive bearing 871 is connected with a conducting wire 810, each conductive sleeve 92 sends a detection signal of the annular detection device 88 to a display system through a signal wire 10, and the valve cover 9 is provided with a plurality of circular holes 94 for the signal wires 10 to pass through, as shown in fig. 7, 8 and 9.
As shown in fig. 6 and 10, the conductive bearing 871 has an arc-shaped structure, the joint between the conductive bearing 871 and the valve stem 87 is also provided with a concave structure, and the conductive sleeve 92 and the valve cover 9 are also provided with a matched arc-shaped concave structure, so that the conductive sleeve 92 and the opposite conductive bearing 871 form a matched cylindrical structure to prevent a group of balls 91 arranged between the conductive sleeve 92 and the conductive bearing 871 and having a diameter matched with the diameter from shaking to affect the conductive effect.
8. A method for detecting a leak detection device of a single-exhalation valve comprises the following steps:
when the single exhalation valve does not leak, the annular detection device 88 below the valve disc 84 is fastened to the valve seat 7 under the action of the gravity of the counterweight 82, at this time, all conducting contacts of the upper circuit layer 881 of the annular detection device 88 are correspondingly contacted with all fan-shaped pressure contact circuits on the lower circuit layer 883, the circuits on the lower circuit layer 883 are conducted, and the annular detection device 88 outputs pressure signals to the display system through the lead 810 and the conducting mechanism in sequence;
when the single exhale valve leaks, the partial area of valve disc 84 is impacted by the gas pressure in the valve and moves up to drive sealing film 89 and valve seat 7 to separate, the separation place of sealing film 89 and valve seat 7 is the valve leakage place, the partial annular detection device 88 corresponding to the region of leakage place no longer receives the effect of gravity, the upper circuit layer 881 corresponding to the region can't contact with the fan-shaped pressure contact circuit on the lower circuit layer 883 corresponding to the position because of insufficient pressure, thereby let the fan-shaped pressure contact circuit that can't conduct break, it can't transmit effective signal to correspond wire 810 and signal line 10, thereby the display system judges the regional position that produces the leakage through the region of no pressure signal.
It should be noted that, in order to prevent the signal acquisition part from short-circuiting during signal transmission, the part of the signal acquisition part contacting the valve should be coated with an insulating layer to protect the various elements of the signal acquisition part.
When in use, the utility model is used,
s1, before the test is started, whether each part is installed correctly and whether the display module 9 can display normally are checked, and the step S2 is executed after the check is finished;
s2, closing the pressure regulating valve 4, starting the air compressor 1, and closing the air compressor 1 after the gas pressure in the pressure stabilizing tank reaches the opening pressure of the valve;
s3, slowly opening the pressure regulating valve 4 to gradually increase the pressure in the valve cavity of the single exhalation valve 6;
and S4, observing the display module 9, and judging whether the valve leaks or not and the approximate position of the leakage.
Claims (8)
1. A leak detection device of a single exhalation valve, characterized in that: the valve comprises an annular detection device (88) arranged between a valve disc (84) and a valve seat (7), wherein the annular detection device (88) comprises a pressure trigger circuit which forms a plurality of fan-shaped structures of an annular structure, the pressure trigger circuit is conducted when being pressed by pressure, and the pressure trigger circuit is disconnected when the pressure is lower than a threshold value; the pressure state of the valve disc (84) is monitored in real time by utilizing the pressure trigger circuits with the fan-shaped structures, so that whether the pressure of the valve disc (84) in the closed state is balanced or not is judged, if the pressure trigger circuit with the fan-shaped structures is in an open circuit state, leakage at the valve disc (84) of the single-breathing valve at the moment is judged, and meanwhile, a leakage area is judged according to the position on the valve disc (84) corresponding to the open circuit pressure trigger circuit.
2. The leak detection device of a single exhalation valve according to claim 1, characterized in that: the device comprises a simulated air inlet generating system, a leakage detecting system and a display system; the detected single-breath valve comprises a lower valve body (6), a valve seat (7), a valve rod group (8), a valve cover (9) and an upper valve body (13); the simulated air inlet generating system is hermetically connected with an air inlet of the single-expiratory valve, the leakage detection system is arranged in the single-expiratory valve, and the display system is connected with the leakage detection system and displays data of the leakage detection system; the valve seat (7) is fixed in a round hole at the lower end of the upper valve body (13); the lower valve body (6) is connected with the lower end of the upper valve body (13) through a bolt; the valve rod group (8) is placed on the valve seat (7); the valve cover (9) is connected with the upper end of the upper valve body (13) in a bolt connection mode; the axes of the lower valve body (6), the valve seat (7), the valve rod group (8), the valve cover (9) and the upper valve body (13) are mutually overlapped;
the simulated air inlet generation system comprises an air compressor (1), a pressure stabilizing tank (3), a pressure regulating valve (4) and a flange plate (5) which are connected in series by a gas transmission pipeline (2), wherein the flange plate (5) is connected with an air inlet of a single exhalation valve in a sealing manner;
the leakage detection system comprises a valve rod group (8) arranged on a valve seat (7) of the single-exhalation valve; the valve rod group (8) comprises a valve rod (87) with a hollow structure, a valve disc (4) matched with the valve seat (7) is arranged on the valve rod (87), an annular detection device (88) matched with the valve seat (7) is fixed below the valve disc (4) through a locking nut (86) and a pressing sheet (85), a sealing film (89) is arranged between the annular detection device (88) and the pressing sheet (85), a valve cap (83) used for covering the valve seat (7) is arranged above the valve disc (4), and a balancing weight (82) is arranged above the valve cap (83) through a fixing ring (81);
the annular detection device (88) is formed by surrounding a plurality of pressure trigger circuits with fan-shaped structures, and is turned on when the pressure applied on the pressure trigger circuits exceeds a threshold value and is turned off when the pressure is lower than the threshold value, so that the gas pressure applied on different areas on the surface of the annular detection device is detected
And the valve cover (9) is provided with a conductive limiting structure for limiting the sliding position of the end part of the valve rod (87).
3. The leak detection device of a single exhalation valve according to claim 1, characterized in that: the upper portion and the lower part of hollow structure's valve rod (87) are equipped with round hole (873) and lower round hole (872) on a circle respectively around the lateral wall, wherein round hole (873) and lower round hole (872) are gone up in the hollow structure intercommunication of valve rod (87), wherein cyclic annular detection device (88) are connected with wire (810), wire (810) are worn out from last round hole (873) and are contacted with electrically conductive limit structure from round hole (872) the hollow structure that passes valve rod (87) down at last, be connected with display system through electrically conductive limit structure, display system is including controller (11) and display module (12) that the order is connected.
4. The leak detection device of a single exhalation valve according to claim 3, characterized in that: the annular detection device (88) comprises a lower circuit layer (883), a partition plate layer (882) and an upper circuit layer (881) which are of annular structures; wherein the front of lower circuit layer (883) is glued with the back of baffle layer (882) and is linked to each other, and the front of baffle layer (882) is glued with the back of last circuit layer (881) and is linked to each other, and the back of lower circuit layer (883) is the lower terminal surface of cyclic annular detection device (88), the front of last circuit layer (881) is the up end of cyclic annular detection device (88).
5. The leak detection device of a single exhalation valve according to claim 4, characterized in that: pressure contact circuits with a plurality of groups of fan-shaped structures are respectively arranged at equal included angles on the lower circuit layer (883), fan-shaped hollows matched with the number of the contact circuits are formed in the partition plate layer (882), and conducting contacts matched with the number and the positions of the pressure contact circuits with the plurality of groups of fan-shaped structures arranged on the upper surface of the lower circuit layer (883) are arranged on the lower surface of the upper circuit layer (881), so that the contacts of the upper circuit layer (881) can be in contact with and conducted with the fan-shaped pressure contact circuits of the lower circuit layer (883) through fan-shaped holes (95) formed in the partition plate layer (882); each pressure contact circuit and the conducting contact form a pressure trigger circuit; the partition plate layer (882) and the upper circuit layer (881) are made of elastic materials, when the upper circuit layer (881) is pressed from bottom to top, the conducting contact area is arranged under the action of pressure to deform so as to be in contact with the pressure contact circuit of the upper circuit layer (881) to conduct the circuit, and if the pressure is reduced, the conducting contact and the pressure contact circuit are rebounded to separate to realize disconnection; the pressure trigger circuit is connected with leads (810), and each group is according to actual needs; the pressure trigger circuits are all connected with a conducting wire (810), or a plurality of groups of pressure trigger circuits are connected in series and are connected with a conducting wire (810) together.
6. The leak detection device of a single exhalation valve according to claim 1, characterized in that: the conductive limiting structure comprises a plurality of conductive bearing bushes (871) arranged at the outer side of the end part of the valve rod (87) and a plurality of conductive sleeves (92) arranged at the joint of the valve cover (9) and the valve rod (87), and a group of balls (91) for conducting electricity are arranged between each conductive bearing bush (871) and the conductive sleeve (92) at the corresponding position; wherein ball (91) below is equipped with stopper (93) in shutoff clearance, stopper (93) fan-shaped protruding insert electrically conductive sleeve (92) in, prevent that ball (91) from dropping, wherein every round hole (873) outside is equipped with a slice electrically conductive axle bush (871), every electrically conductive axle bush (871) all is connected with a wire (810), every electrically conductive sleeve (92) all in sending the detected signal of annular detection device (88) to display system through signal line (10), it has a plurality of round holes (94) to be convenient for on valve gap (9) to wear out signal line (10).
7. The leak detection device for a single exhalation valve according to claim 6, wherein: the conductive bearing bush (871) is of an arc-shaped structure, the connecting part of the conductive bearing bush (871) and the valve rod (87) is also set to be of a concave structure, and the conductive sleeve (92) and the valve cover (9) are also of a matched arc-shaped concave structure, so that the conductive sleeve (92) and the opposite conductive bearing bush (871) form a matched cylindrical structure to prevent a group of balls (91) which are arranged between the conductive sleeve (92) and the valve cover and are matched with the diameter from shaking to influence the conductive effect.
8. A method of testing a leak testing apparatus using a single exhalation valve as claimed in any one of the preceding claims, characterized by the steps of:
when the single-breath valve does not leak, the annular detection device (88) below the valve disc (84) is fastened on the valve seat (7) under the action of gravity of the balancing weight (82), all conducting contacts of the upper circuit layer (881) of the annular detection device (88) are correspondingly contacted with all fan-shaped pressure contact circuits on the lower circuit layer (883), the circuits on the lower circuit layer (883) are conducted, and the annular detection device (88) outputs pressure signals to a display system through a lead (810) and a conducting mechanism;
when the single-exhalation valve leaks, part of the area of the valve disc (84) is impacted by gas pressure in the valve to move upwards to drive the sealing film (89) to be separated from the valve seat (7), the separation part of the sealing film (89) and the valve seat (7) is a valve leakage part, part of the annular detection device (88) in the corresponding area of the leakage part is not acted by gravity any more, the upper circuit layer (881) in the corresponding area cannot be in contact with the fan-shaped pressure contact circuit on the lower circuit layer (883) in the corresponding position due to insufficient pressure, so that the fan-shaped pressure contact circuit which cannot be conducted is broken, the corresponding lead (810) and the signal wire (10) cannot conduct effective signals, and the display system judges the area position where leakage is generated through the area without pressure signals.
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