Quick leak detection connector, leak detection system containing same and use method

Abstract

The present invention discloses a quick leak detection joint, a leak detection system containing the same and a use method thereof. The quick leak detection joint comprises a joint body, one end of which is provided with a first plug corresponding to the inlet of the expansion valve and a second plug corresponding to the outlet of the expansion valve; a sealing groove is circumferentially provided on the first plug and the second plug, and a sealing ring is installed in the sealing groove; the other end of the joint body is rotatably connected to a rotating head, and the rotating head is provided with a clamping head facing one side of the joint body; rotating the rotating head can make the clamping head enter the bottom of the expansion valve and clamp on the heat exchanger; a pipeline interface is provided on the side of the joint body, and a through hole is provided on the first plug and / or the second plug, and the through hole and the pipeline interface are interconnected. The quick leak detection joint provided by the present invention can be quickly installed at the interface position after the expansion valve is installed on the heat exchanger, has the effects of high repeatability and fast installation and disassembly, and is more suitable for the current leak detection production rhythm.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioner heat exchanger manufacturing, in particular to a quick leak detection joint, a leak detection system containing the same and a use method thereof. Background Art

[0002] Currently, there are helium mass spectrometer leak detection, halogen leak detection, differential pressure leak detection, water leak detection, etc. in the airtightness leak detection methods, but to meet the annual leakage requirement of more than 2g / year, there are mainly helium mass spectrometer leak detection and halogen leak detection.

[0003] However, the helium mass spectrometer leak detection equipment for automobile air conditioning heat exchangers is expensive and takes a long time to detect leaks. Halogen detection is basically a single-machine detection, and its efficiency cannot keep up with the production line rhythm. Therefore, it is necessary to develop an online leak detection device for the interface after the expansion valve is installed on the heat exchanger with high accuracy, short cycle, reliable operation, economy and environmental protection. Summary of the invention

[0004] In view of this, one of the purposes of the present invention is to provide a quick leak detection connector, which can be quickly installed at the interface after the expansion valve is installed in the heat exchanger, has high repeatability, fast installation and disassembly, and is more suitable for the current leak detection production rhythm.

[0005] To achieve the above object, the technical solution of the present invention is:

[0006] A quick leak detection connector, used to be connected to the inlet and outlet of the expansion valve after the expansion valve is installed in the heat exchanger; it comprises a connector body, one end of which is provided with a first plug corresponding to the inlet of the expansion valve and a second plug corresponding to the outlet of the expansion valve; a sealing groove is circumferentially opened on the first plug and the second plug, and a sealing ring is installed in the sealing groove; the other end of the connector body is rotatably connected to a rotating head, and the rotating head is provided with a clamping head facing one side of the connector body; rotating the rotating head can make the clamping head enter the bottom of the expansion valve and clamp on the heat exchanger; a pipeline interface is provided on the side of the connector body, and a through hole is opened on the first plug and / or the second plug, and the through hole is connected with the pipeline interface.

[0007] Preferably, two sealing grooves are provided on the first plug and two sealing grooves are provided on the second plug.

[0008] The second object of the present invention is to provide a leak detection system, comprising a vacuum pump, a gas filling machine, an air pump, a PLC controller, a pipeline and any of the above-mentioned quick leak detection joints, the quick leak detection joint being sealingly installed on the expansion valve, one end of the pipeline being connected to the pipeline interface, and the other end being connected to the vacuum pump, the gas filling machine and the air pump through a solenoid valve, respectively, and the PLC controller being connected to the solenoid valve, the vacuum pump, the gas filling machine and the air pump signal respectively.

[0009] Preferably, the solenoid valve includes a first solenoid valve, a second solenoid valve and a third solenoid valve, and the pipeline includes a leak detection pipeline, an air extraction pipeline, a gas filling pipeline and a vacuum extraction pipeline, one end of the leak detection pipeline is connected to the pipeline interface, and the other end is respectively connected to the first solenoid valve, the second solenoid valve and the third solenoid valve; the first solenoid valve is connected to the gas pump through the air extraction pipeline; the second solenoid valve is connected to the gas filling machine through the gas filling pipeline; the third solenoid valve is connected to the vacuum pump through the vacuum extraction pipeline.

[0010] Preferably, the solenoid valve is a four-way solenoid valve, and the pipeline includes a leak detection pipeline, an air extraction pipeline, a gas filling pipeline and a vacuum extraction pipeline; one of the interfaces of the four-way solenoid valve is connected to the pipeline interface through the leak detection pipeline, and the other three interfaces are respectively connected to the air extraction machine, the gas filling machine and the vacuum pump through the air extraction pipeline, the gas filling pipeline and the vacuum extraction pipeline.

[0011] Preferably, the gas filling machine and the air exhaust machine are integrated into a whole, which is a fluorine collecting and adding machine.

[0012] A third object of the present invention is to provide a method for using a leak detection system, comprising the following steps:

[0013] S1. Install the expansion valve on the heat exchanger;

[0014] S2. Install any of the above-mentioned quick leak detection joints at the inlet and outlet of the expansion valve in a sealed manner;

[0015] S3, control the PLC controller to evacuate the heat exchanger, and when the vacuum degree reaches the preset vacuum degree, the vacuum pump stops running;

[0016] S4, after controlling the PLC controller to charge the heat exchanger with halogen to a first preset pressure value, the halogen charging device stops running;

[0017] S5. Use a halogen leak detection gun to perform halogen leak detection;

[0018] S6. After the halogen leak detection is completed, the PLC controller is controlled to recover the halogen from the heat exchanger. When the halogen recovery pressure reaches the second preset pressure value, the halogen recovery equipment stops running.

[0019] Preferably, in step S3, the preset vacuum degree is 15-25 pa; in step S4, the first preset pressure value is 0.4-0.6 MPa; in step S6, the second preset pressure value is 0.01-0.03 MPa.

[0020] Preferably, in step S3, the vacuuming time is 3 to 5 seconds; in step S4, the halogen filling time is 2 to 4 seconds; in step S5, the halogen leak detection time is 10 to 15 seconds; in step S6, the halogen recovery time is 8 to 12 seconds.

[0021] Preferably, in step S3, the vacuuming time is 4 s; in step S4, the halogen filling time is 3 s; in step S5, the halogen leak detection time is 12 s; and in step S6, the halogen recovery time is 10 s.

[0022] The beneficial effects of the present invention are:

[0023] (1) Compared with the traditional stand-alone halogen inspection, which uses a rubber plug to tighten the pressure plate with screws, and a needle is used for filling and halogen gas recovery, resulting in the rubber plug being recycled only twice on average, and the leakage of halogen gas into the atmosphere affects the environment. After the online use of the quick leak detection joint provided by the present invention, the quick leak detection joint and the halogen gas can be 100% recycled, and the cost of each quick leak detection joint and gas detection, as well as the cost of joint loading and unloading can save more than 0.5 yuan; and the disassembly and assembly method is simple and fast, and the disassembly and assembly time can be completed within 2 seconds, thereby effectively reducing the production cycle;

[0024] (2) Compared with the original bell-shaped helium mass spectrometer leak detector, which has an equipment cost of about one million and a production cycle of 68 seconds, the leak detection system and leak detection method provided by the present invention, combined with a quick leak detection connector, can reduce the production cycle to less than 33 seconds. The equipment price investment is only 120,000 yuan, and the detection accuracy can reach more than 2g / year. It significantly reduces the production cycle, improves production efficiency, and reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the quick leak detection connector of the present invention;

[0026] Figure 2 This is a schematic diagram of the main structure of the quick leak detection connector of the present invention;

[0027] Figure 3 It is a side structural schematic diagram of the quick leak detection connector of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the heat exchanger of the present invention after the expansion valve is installed;

[0029] Figure 5This is a schematic diagram of the structure of the heat exchanger of the present invention after being connected with a quick leak detection joint;

[0030] Figure 6 A schematic diagram of the structure of the leak detection system of the present invention using multiple solenoid valves;

[0031] Figure 7 This is a schematic diagram of the structure of a four-way solenoid valve used in the leak detection system of the present invention.

[0032] Description of reference numerals:

[0033] 1. Quick leak detection connector; 11. Connector body; 12. First plug; 13. Second plug; 14. Sealing groove; 15. Sealing ring; 16. Rotating head; 17. Clamp; 18. Pipeline interface; 2. Expansion valve; 21. Inlet; 22. Outlet; 3. Vacuum pump; 4. Gas filling machine; 5. PLC controller; 61. Leak detection pipeline; 62. Air extraction pipeline; 63. Gas filling pipeline; 64. Vacuum extraction pipeline; 71. First solenoid valve; 72. First solenoid valve; 73. Third solenoid valve; 74. Four-way solenoid valve; 8. Fluorine collector and fluorine filling machine; 9. Air pump; 10. Heat exchanger. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0035] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0036] Example 1

[0037] refer to Figures 1 to 5As shown, a quick leak detection connector is used to be connected to the inlet and outlet of the expansion valve 2 after the expansion valve 2 is installed in the heat exchanger 10; it includes a connector body 11, one end of which is provided with a first plug 12 corresponding to the inlet 21 of the expansion valve and a second plug 13 corresponding to the outlet 22 of the expansion valve; a sealing groove 14 is circumferentially opened on the first plug 12 and the second plug 13, and a sealing ring 15 is installed in the sealing groove 14; the other end of the connector body 11 is rotatably connected to a rotating head 16, and the rotating head 16 is provided with a clamping head 17 facing one side of the connector body 11; rotating the rotating head 16 can make the clamping head 17 enter the bottom of the expansion valve and clamp on the heat exchanger 10; a pipeline interface 18 is provided on the side of the connector body 11, and a through hole (not shown in the figure) is opened on the first plug 12 and / or the second plug 13, and the through hole is connected with the pipeline interface 18.

[0038] In the illustrated embodiment, two sealing grooves 14 are provided on each of the first plug 12 and the second plug 13 to improve the sealing performance of the plugs.

[0039] In this embodiment, the joint body 11 is a rectangular block structure; the rotating head 16 is a pancake-shaped structure, the rotating head 16 is rotatably connected to the front end of the joint body 11, the first plug 12 and the second plug 13 are arranged side by side at the rear end of the joint body 11, and the pipe interface 18 is opened on the side of the joint body 11; the through hole is formed by punching along the central axis of the first plug 12 and / or the second plug 13, and a hole is punched inward from the pipe interface 18 so that it intersects with the through hole, thereby forming a passage between the leak detection pipeline 61 and the core of the heat exchanger 10.

[0040] In this embodiment, two clamps are provided. When in use, the first plug 12 and the second plug 13 are aligned to the inlet 21 and the outlet 22 of the expansion valve 2; then the rotating head 16 is rotated counterclockwise, and the clamp 17 enters the lower bottom surface of the expansion valve 2 to clamp the heat exchanger 10. Since the first plug 12 and the second plug 13 adopt radial sealing, the tightness of the clamp 17 does not affect the sealing leakage. When the core of the heat exchanger 10 is filled with leak detection gas, the joint body 11 retreats due to the pressure, and the clamp 17 clamps the expansion valve 2. When disassembly is required, rotate the rotating head 16 clockwise and pull the joint body 11 outward, so that the quick leak detection joint 1 is disengaged. In this embodiment, the core of the heat exchanger 10 is the evaporator core.

[0041] In this embodiment, compared with the traditional stand-alone halogen inspection, the rubber plug pressure plate is tightened with screws, and the filling and halogen gas recovery are carried out with a needle, which causes the rubber plug to be recycled only twice on average, and the leakage of halogen gas into the atmosphere affects the environment. After the quick leak detection joint provided by this embodiment is adopted online, the quick leak detection joint 1 and the halogen gas can be recycled 100%, and the cost of each quick leak detection joint and gas detection, as well as the cost of joint loading and unloading can save more than 0.5 yuan; and the disassembly and assembly method is simple and quick, and the disassembly and assembly time can be completed within 2 seconds, respectively, thereby effectively reducing the production cycle.

[0042] Example 2

[0043] Combination Figure 6 and Figure 7 As shown, this embodiment provides a leak detection system, including a vacuum pump 3, a gas filling machine 4, an air pump 9, a PLC controller 5, a pipeline and the quick leak detection joint 1 described in Example 1, the quick leak detection joint 1 is sealed and installed on the expansion valve 2, one end of the pipeline is connected to the pipeline interface 18, and the other end is connected to the vacuum pump 4, the gas filling machine 4 and the air pump 9 through the pipeline and the solenoid valve respectively, and the PLC controller 5 is signal-connected to the solenoid valve, the vacuum pump 3, the gas filling machine 4 and the air pump 9 respectively.

[0044] Specifically, refer to Figure 6 As shown, it is a leak detection system using multiple solenoid valves, the solenoid valves include a first solenoid valve 71, a second solenoid valve 72 and a third solenoid valve 73, the pipeline includes a leak detection pipeline 61, an air extraction pipeline 62, a gas filling pipeline 63 and a vacuum extraction pipeline 64, one end of the leak detection pipeline 61 is connected to the pipeline interface 18, and the other end is respectively connected to the first solenoid valve 71, the first solenoid valve 72 and the third solenoid valve 73; the first solenoid valve 71 is connected to the vacuum pump 9 through the air extraction pipeline 62; the second solenoid valve 72 is connected to the gas filling machine 4 through the gas filling pipeline 63; the third solenoid valve 73 is connected to the vacuum pump 3 through the vacuum extraction pipeline 64. In this embodiment, the added gas is fluorine, and the gas filling machine and the air extraction machine are integrated, namely, the fluorine collecting and adding machine 8; three solenoid valves are used, which are connected in parallel to the leak detection pipeline 61, the first solenoid valve 71 is connected to the fluorine extraction interface of the fluorine collecting and adding machine 8, the second solenoid valve 72 is connected to the fluorine adding interface, and the third solenoid valve 73 is connected to the interface of the vacuum pump 3. The three solenoid valves and the vacuum pump 3, and the fluorine collecting and adding machine 8 are all controlled by the PLC controller 5. The PLC controller 5 automatically controls the solenoid valves and the fluorine collecting and adding machine 8, and the vacuum pump 3 respectively, and the device automatically completes the vacuuming, fluorine adding and pressure maintaining process, and the device reminds the operator to use the halogen detector to detect leaks. After the leak detection is completed, the operator presses the device button, and the device automatically completes the fluorine collecting process.

[0045] Example 3

[0046] Combination Figure 7 As shown, in this embodiment, a leak detection system using a four-way solenoid valve is provided, that is, the solenoid valve is a four-way solenoid valve 74, and the pipeline includes a leak detection pipeline 61, an air extraction pipeline 62, a gas filling pipeline 63 and a vacuum extraction pipeline 64; one of the interfaces of the four-way solenoid valve 74 is connected to the pipeline interface 18 through the leak detection pipeline 61, and the other three interfaces are respectively connected to the exhaust machine 9, the gas filling machine 4 and the vacuum pump 3 through the air extraction pipeline 62, the gas filling pipeline 63 and the vacuum extraction pipeline 64.

[0047] In this embodiment, the gas filling machine 4 is a fluorine filling machine, and the air extraction machine 9 is a fluorine extraction machine. The quick leak detection joint 1, the vacuum pump 3, the fluorine filling machine and the fluorine extraction machine are connected through a 4-position 4-way solenoid valve, and the four-way solenoid valve 74 is controlled by the PLC controller 5. The four-way solenoid valve 74 is respectively executed: a. the leak detection pipeline 61-vacuum extraction pipeline 64 are interconnected; b. the leak detection pipeline 61-gas filling pipeline 63 are interconnected, c. all pipelines are disconnected; d. the leak detection pipeline 61-air extraction pipeline 64 are interconnected. The four-way solenoid valve is controlled by the PLC controller 5. The operator presses the start button, and the four-way solenoid valve executes a, turning on the vacuum pump 3 to perform vacuuming. When the vacuum reaches 20pa, the vacuum pump 3 stops; the four-way solenoid valve executes b, the fluorine filling machine is turned on, the fluorine gas is filled to 0.5MPa, and the fluorine filling machine stops; the four-way solenoid valve executes c, at which time the equipment enters the waiting time. After the operator gives a signal to the equipment, the four-way solenoid valve executes d, the fluorine extraction machine is turned on, and when the fluorine gas recovery pressure reaches 0.02MPa, the fluorine gas recovery equipment stops, and the four-way solenoid valve returns to state a, waiting for the next device cycle.

[0048] Example 4

[0049] This embodiment provides a method for using a leak detection system, comprising the following steps:

[0050] S1, installing the expansion valve 2 on the heat exchanger 10;

[0051] S2. Install the quick leak detection joint 1 described in Example 1 at the inlet and outlet of the expansion valve 2 in a sealed manner;

[0052] S3, control the PLC controller 5 to evacuate the heat exchanger 10, and after the vacuum degree reaches a preset vacuum degree, the vacuum pump 3 stops running; in this embodiment, the preset vacuum degree is 15-25 Pa, preferably 20 Pa;

[0053] S4, after the PLC controller 5 is controlled to charge the heat exchanger 10 with halogen to a first preset pressure value, the halogen charging device, i.e., the fluorine collecting and adding machine 8, stops running; in this embodiment, the first preset pressure value is 0.4-0.6 MPa, preferably 0.5 MPa;

[0054] S5. Use a halogen leak detection gun to detect halogen leaks. Use the halogen gun to detect whether there is halogen element, i.e. fluorine gas, leaking into the air within 5mm of the sealing ring. Since the halogen leak detection gun is a vacuum suction gun, halogen molecules enter the suction gun with the air and enter the metal platinum electrode at a temperature of 800-900℃. When the metal platinum positive ion emission encounters the halogen gas, this emission will increase sharply. The amount of halogen molecules leaking out is fed back through the current, thereby confirming the leakage rate.

[0055] S6. After the halogen leak detection is completed, the PLC controller 5 is controlled to recover the halogen from the heat exchanger 10. When the halogen recovery pressure reaches a second preset pressure value, the halogen recovery equipment stops running. In this embodiment, the second preset pressure value is 0.01-0.03 MPa, preferably 0.02 MPa.

[0056] Specifically, when in use, the equipment takes 4 seconds to evacuate the vacuum, the vacuum degree reaches 20pa, the halogen filling time is 3 seconds, and the filling pressure reaches 0.5MPa; the equipment maintains pressure and waits for the operator to perform halogen leak detection (the manual time is approximately 12 seconds), and the equipment recovers the halogen gas, the recovery time is 10 seconds, and the recovery pressure is 0.02MPa. The total equipment cycle time is 29S, the manual assembly and disassembly of the quick leak detection joint each takes 2S, and the production cycle is only 33S. Compared with the original bell-shaped helium mass spectrometer leak detector, the equipment cost is about one million, and the production cycle is 68 seconds. The leak detection system and leak detection method provided by the present invention can significantly reduce the production cycle, improve production efficiency, and reduce production costs.

[0057] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A leak detection system, characterized in that: It comprises a vacuum pump (3), a gas filling machine (4), an air extractor (9), a PLC controller (5), a pipeline and a quick leak detection joint (1), wherein the quick leak detection joint (1) is sealed and mounted on the expansion valve (2), one end of the pipeline is connected to the pipeline interface (18), and the other end is connected to the vacuum pump (4), the gas filling machine (4) and the air extractor (9) respectively through the pipeline and the solenoid valve, and the PLC controller (5) is signal-connected to the solenoid valve, the vacuum pump (3), the gas filling machine (4) and the air extractor (9) respectively; The quick leak detection connector (1) is used to be connected to the inlet and outlet of the expansion valve (2) after the expansion valve (2) is installed on the heat exchanger (10); it comprises a connector body (11); one end of the connector body (11) is provided with a first plug (12) corresponding to the inlet (21) of the expansion valve and a second plug (13) corresponding to the outlet (22) of the expansion valve; the first plug (12) and the second plug (13) are provided with sealing grooves (14) in an annular direction, and sealing rings (15) are installed in the sealing grooves (14). The other end of the joint body (11) is rotatably connected to a rotating head (16), and the rotating head (16) is provided with a clamping head (17) facing one side of the joint body (11); the rotating head (16) is rotated so that the clamping head (17) enters the bottom of the expansion valve and is clamped on the heat exchanger (10); a pipeline interface (18) is provided on the side of the joint body (11), and a through hole is opened on the first plug (12) and / or the second plug (13), and the through hole is communicated with the pipeline interface (18).

2. The leak detection system according to claim 1, characterized in that: Two sealing grooves (14) are provided on each of the first plug (12) and the second plug (13).

3. The leak detection system according to claim 1, characterized in that: The solenoid valve comprises a first solenoid valve (71), a second solenoid valve (72) and a third solenoid valve (73); the pipeline comprises a leak detection pipeline (61), an air extraction pipeline (62), a gas filling pipeline (63) and a vacuum extraction pipeline (64); one end of the leak detection pipeline (61) is connected to the pipeline interface (18), and the other end is respectively connected to the first solenoid valve (71), the first solenoid valve (72) and the third solenoid valve (73); the first solenoid valve (71) is connected to the gas extractor (9) through the air extraction pipeline (62); the second solenoid valve (72) is connected to the gas filling machine (4) through the gas filling pipeline (63); and the third solenoid valve (73) is connected to the vacuum pump (3) through the vacuum extraction pipeline (64).

4. The leak detection system according to claim 1, characterized in that: The solenoid valve is a four-way solenoid valve (74), and the pipeline comprises a leak detection pipeline (61), an air extraction pipeline (62), an air filling pipeline (63) and a vacuum extraction pipeline (64); one of the interfaces of the four-way solenoid valve (74) is connected to the pipeline interface (18) through the leak detection pipeline (61), and the other three interfaces are connected to the air extraction machine (9), the air filling machine (4) and the vacuum pump (3) respectively through the air extraction pipeline (62), the air filling pipeline (63) and the vacuum extraction pipeline (64).

5. The leak detection system according to claim 1, characterized in that: The gas filling machine and the gas extraction machine are integrated into a whole, and are a fluorine collecting and filling machine (8).

6. A method for using the leak detection system according to claim 1 or 2, characterized in that: The following steps are involved: S1. Install the expansion valve (2) on the heat exchanger (10); S2. Installing the quick leak detection connector (1) in a sealed manner at the inlet and outlet of the expansion valve (2); S3, controlling the PLC controller (5) to evacuate the heat exchanger (10), and after the vacuum degree of the heat exchanger (10) reaches a preset vacuum degree, the vacuum pump (3) stops running; S4, controlling the PLC controller (5) to fill the heat exchanger (10) with halogen to a first preset pressure value, and then stopping the operation of the halogen filling device; S5. Use a halogen leak detection gun to perform halogen leak detection; S6. After the halogen leak detection is completed, the PLC controller (5) is controlled to recover the halogen from the heat exchanger (10). When the halogen recovery pressure reaches a second preset pressure value, the halogen recovery device stops running.

7. The method for using the leak detection system according to claim 6, characterized in that: In step S3, the preset vacuum degree is 15-25 pa; in step S4, the first preset pressure value is 0.4-0.6 MPa; in step S6, the second preset pressure value is 0.01-0.03 MPa.

8. The method for using the leak detection system according to claim 6, characterized in that: In step S3, the vacuuming time is 3 to 5 seconds; in step S4, the halogen filling time is 2 to 4 seconds; in step S5, the halogen leak detection time is 10 to 15 seconds; in step S6, the halogen recovery time is 8 to 12 seconds.

9. The method for using the leak detection system according to claim 6, characterized in that: In step S3, the vacuuming time is 4 seconds; in step S4, the halogen filling time is 3 seconds; in step S5, the halogen leak detection time is 12 seconds; in step S6, the halogen recovery time is 10 seconds.

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