Pump body sealing detection device

Abstract

The present invention relates to the technical field of pump body air tightness detection, and specifically, to a pump body airtightness detection device. It comprises a test bench and a support frame arranged on the test bench, a fixing ring for fixing the pump housing is arranged on the support frame, an air supply device is arranged on the upper surface of the test bench close to the support frame, an inner sealing ring is arranged on the outer sleeve of the pump housing, a plurality of exhaust holes are provided on the inner sealing ring, and an outer sealing ring is arranged on the outer sleeve of the inner sealing ring, and an exhaust hole is also provided on the outer sealing ring, and a bracket fixedly connected to the support frame is arranged on the outer side of the outer sealing ring. When the exhaust hole is detected as a leak point, a marking device marks it, and as the piston push rod moves, a horizontal line is formed on the outside of the pump housing, so that the leak position is detected through coordinates in coordination with the arc formed between the multiple leak points on the cross section of the pump housing, thereby improving the accuracy of the detection and facilitating the determination of the positions of different leak points.

Description

Technical Field

[0001] The invention relates to the technical field of pump body air tightness detection, in particular to a pump body air tightness detection device. Background Art

[0002] A water pump is a machine that transports liquids or pressurizes liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid to increase the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspensions and liquid metals. The air tightness of the water pump casing needs to be tested after it is produced. There are many ways to test it, including water testing (immersing the pump casing in water to observe whether bubbles are generated) and pressure testing (sealing the pump in a container, increasing the pressure and monitoring the changes to determine the air tightness)

[0003] There are many existing technologies for pump casing air tightness testing, such as:

[0004] Chinese patent publication number CN213148227U discloses an air pump housing air tightness detection device, which relates to the field of air pump detection equipment, including a frame and multiple independent detection mechanisms, wherein the detection mechanism includes a lower mold, an upper mold, a cylinder and a transparent measuring cup. The staff puts the air pump housing into the lower mold, and the cylinder pushes the upper mold to buckle on the lower mold. When the upper mold is buckled on the lower mold, the outlet of the air inlet channel of the upper mold seals the air inlet of the air pump housing. At this time, the air intake pipeline inflates the air pump housing through the air intake channel. When the air pump housing has excellent air tightness, no bubbles are generated in the measuring cup. It not only saves time and effort, but also can greatly improve the circulation efficiency of the air pump housing in the later stage.

[0005] Chinese patent publication number CN208297044U discloses a pump casing air tightness detection device, which relates to the field of pump casing testing technology, including a bottom plate, a bottom platform and a support platform are arranged on the bottom plate, a plurality of push plates are arranged on the peripheral side of the support platform to slide on the upper end surface of the bottom platform, and an air outlet is opened on the top surface of the support platform. The gas ejected from the air outlet enters the pump casing, and the inspector checks the air tightness of the pump casing by checking whether there is a gas leakage position on the outside of the pump casing. The air tightness detection speed is fast and the success rate is high.

[0006] However, if the water test method is used, when the outer wall of the pump casing is bumped, multiple cracks will be generated on the outer wall of the pump casing, and the cracks are all on the same section of the pump casing. Then, when the pump casing is immersed in water, bubbles will emerge from the multiple cracks on the section, and the bubbles below the section will float upward along the outer wall of the pump casing. This will cause the bubbles overflowing from the cracks below the section to overlap and become disordered, affecting the inspection personnel's observation and making it impossible to determine the location of the cracks. Secondly, if the pressure test method is used directly, although it can determine whether the pump casing is leaking, it is impossible to determine the specific area of ​​the leak. Summary of the invention

[0007] The object of the present invention is to provide a pump body sealing detection device to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned object, the present invention aims to provide a pump body sealing detection device, comprising a test bench and a support frame arranged on the test bench, a fixing ring for fixing a pump casing is arranged on the support frame, an air supply device is arranged on the upper surface of the test bench close to the support frame, an inner sealing ring is sleeved on the outer side of the pump casing, a plurality of exhaust holes are provided on the inner sealing ring, an outer sealing ring is sleeved on the outer side of the inner sealing ring, exhaust holes are also provided on the outer sealing ring, a bracket fixedly connected to the support frame is arranged on the outer side of the outer sealing ring, and a gas supply device for driving the pump casing is fixedly arranged on the top of the bracket. The power part drives the outer sealing ring to rotate, the exhaust hole provided on the outer sealing ring is connected with an air guide box fixedly connected with the outer sealing ring, the air guide box is provided with an ejection part and a contraction part inside, the ejection part is connected with the contraction part, and a marking device is provided at the end of the contraction part away from the outer sealing ring, when the exhaust hole on the outer sealing ring rotates to coincide with the exhaust hole on the inner sealing ring, the overflowing gas pushes the contraction part to move, and the contraction part squeezes the air at the connection between the ejection part and the contraction part, and the ejection part presses the marking device, so that the marking device rotates and marks on the outer wall of the pump casing.

[0009] As a further improvement of the present technical solution, the power unit includes a motor and a gear set. The motor is fixed at the top of the bracket. The motor is used to drive the gear set to rotate. The power unit is meshed with the outer sealing ring through the gear set, and the gear set consists of two meshing gears.

[0010] As a further improvement of the present technical solution, a partition is provided between two adjacent exhaust holes in the inner sealing ring, and the width of the partition is set to be the same as that of the exhaust hole. When the exhaust hole in the outer sealing ring moves to completely overlap with the partition, the partition is used to seal the exhaust hole.

[0011] As a further improvement of the present technical solution, an exhaust chamber connected to the exhaust hole in the outer sealing ring is provided inside the air guide box, a compression chamber is also provided inside the air guide box below the exhaust chamber, a conduit is connected between the compression chamber and the exhaust chamber, the contraction portion is located inside the exhaust chamber, the contraction portion includes a piston push rod and a piston head coaxially connected to the piston push rod, the piston push rod passes through the air guide box and is rotatably connected to the marking device, the piston head is sleeved and fitted with the inner wall of the exhaust chamber, and the piston head is located at the end of the exhaust chamber to seal the inside of the exhaust chamber to limit the overflow of gas.

[0012] As a further improvement of the present technical solution, a return spring is fixedly connected to the piston head away from one end of the piston push rod, the return spring is located in the exhaust chamber, and the end of the return spring is fixedly connected to the inner wall of the exhaust chamber.

[0013] As a further improvement of the present technical solution, the ejection part includes a limit rod and a piston plate coaxially connected to the limit rod, the piston plate is sleeved and matched with the inner wall of the compression chamber, and the piston plate is away from the catheter under normal conditions, and the end of the limit rod away from the piston plate is fixedly connected with a baffle, and the baffle is used to abut against the marking device when the marking device marks, so that the marking device is tightly attached to the outer wall of the pump casing.

[0014] As a further improvement of the present technical solution, an airbag is arranged at the bottom of the air guide box near the catheter, and the airbag is connected to the compression chamber. As the gas is continuously transported to the compression chamber for storage, the piston head cooperates with the limit rod to push the airflow in the compression chamber into the airbag, so that the airbag is filled.

[0015] As a further improvement of the present technical solution, an air deflation pipe is provided on the outer sealing ring near the joint between the inner sealing ring and the outer sealing ring, and the air deflation pipe is connected to the exhaust hole in the outer sealing ring. In the process where the airflow flowing in the exhaust hole pushes the piston head to transport air to the airbag, the airflow is divided into two streams, one airflow is discharged from the air deflation pipe, and the other airflow is used to push the piston head to move, so that the piston head gradually returns to its initial position.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the pump body sealing detection device, when the exhaust hole is detected as a leaking point, the marking device marks it, and as the piston push rod moves, a horizontal line is formed on the outside of the pump housing. In this way, the arc formed by multiple leaking points on the cross section of the pump housing is matched to detect the leaking position through coordinates, thereby improving the accuracy of detection and facilitating the determination of the positions of different leaking points.

[0018] 2. In the pump body sealing detection device, the gas in the compression chamber is transported to the airbag to make the airbag gradually expand. At this time, the air vent pipe acts as a buffer to ensure that the pen body is in close contact with the outer wall of the pump casing while the baffle restricts the marking device. In the process of the piston push rod driving the marking device to move, the limit rod will not stop, but move in the same direction as the piston push rod at a speed lower than that of the piston push rod, so that the pen body marks a clear horizontal line on the outer wall of the pump casing, so as to facilitate the later determination of the leakage position and improve the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the support frame, air supply device and pump casing structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the explosion structure of the support frame, pump casing and fixing ring of the present invention;

[0022] Figure 4 It is a schematic diagram of the explosion structure of the inner sealing ring and the outer sealing ring of the present invention;

[0023] Figure 5 It is a schematic diagram of the cutaway structure of the inner sealing ring, the outer sealing ring and the air guide box of the present invention;

[0024] Figure 6 For the present invention Figure 5 A is an enlarged structural diagram;

[0025] Figure 7 It is a right view of the cutaway structure of the inner sealing ring, the outer sealing ring and the air guide box of the present invention;

[0026] Figure 8 For the present invention Figure 7 The enlarged structural diagram at B in FIG.

[0027] Fig. 9 It is a schematic diagram of the counterclockwise rotating structure of the marking device of the present invention.

[0028] The meaning of each number in the figure is:

[0029] 100, test bench; 101, support frame; 110, air supply device; 120, pump housing; 121, fixing ring; 130, bracket;

[0030] 140. Power unit; 141. Motor; 142. Gear set;

[0031] 150, inner sealing ring; 151, exhaust hole; 152, partition; 160, outer sealing ring;

[0032] 170, air guide box; 171, exhaust chamber; 172, compression chamber; 173, guide tube; 174, return spring; 175, air bag; 176, deflation pipe;

[0033] 180, ejector; 181, limit rod; 182, piston plate; 183, baffle; 190, marking device;

[0034] 200, contraction portion; 210, piston push rod; 220, piston head. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Fig. 9 As shown, a pump body sealing detection device is provided, including a test bench 100 and a support frame 101 arranged on the test bench 100, a fixing ring 121 for fixing a pump housing 120 is arranged on the support frame 101, and an air supply device 110 is arranged on the upper surface of the test bench 100 close to the support frame 101. The specific detection process is as follows:

[0038] When testing the sealing performance of the pump casing 120, according to the location of the bump, the inner sealing ring 150 provided on the outside of the pump casing 120 is moved to cover the bump location, and then the pump casing 120 is fixed to the support frame 101 using the fixing ring 121. Then, the two air pipe joints of the pump casing 120 are respectively connected to the water inlet and the outlet of the pump casing 120, and subsequent testing is carried out by filling the pump casing 120 with gas.

[0039] Among them, a plurality of exhaust holes 151 are provided on the inner sealing ring 150, and an outer sealing ring 160 is provided on the outer portion of the inner sealing ring 150, and an exhaust hole 151 is also provided on the outer sealing ring 160. When the pump housing 120 passes through the outer sealing ring 160, the outer sealing ring 160 is sleeved on the outer portion of the inner sealing ring 150, and at this time, the support frame 101 provides support for the pump housing 120. Under normal conditions, the exhaust holes 151 provided on the inner sealing ring 150 and the outer sealing ring 160 overlap, and the inner sealing ring 150 wraps around the leaking position of the pump housing 120 to prevent the gas filled into the pump housing 120 from directly overflowing from the exhaust holes 151 provided on the inner sealing ring 150, thereby playing a sealing role.

[0040] Secondly, the outer sealing ring 160 is provided with a bracket 130 fixedly connected to the support frame 101, and a power unit 140 for driving the outer sealing ring 160 to rotate is fixedly provided on the top of the bracket 130. The power unit 140 includes a motor 141 and a gear set 142. The motor 141 is fixed to the top of the bracket 130. The motor 141 is used to drive the gear set 142 to rotate. The power unit 140 and the outer sealing ring 160 are meshed through the gear set 142. Secondly, the gear set 142 is meshed with two gears (belonging to the prior art and will not be repeated here). When the motor 141 drives the gear to rotate, refer to Figure 7 As shown, the gear drives the outer sealing ring 160 to rotate clockwise, while the inner sealing ring 150 is in a fixed state ( Figure 7 The arrow in the figure indicates the rotation direction of the outer sealing ring 160).

[0041] Below Figure 7 Based on and combined with Figure 8 As shown, a partition 152 is provided between two adjacent exhaust holes 151 in the inner sealing ring 150. As the outer sealing ring 160 rotates clockwise, in order to ensure that when the exhaust hole 151 in the outer sealing ring 160 moves to contact with the partition 152, the exhaust hole 151 in the outer sealing ring 160 will not overlap with the exhaust hole 151 at the next position in the inner sealing ring 150. Therefore, the width of the partition 152 is set to be the same as that of the exhaust hole 151. When the exhaust hole 151 in the outer sealing ring 160 moves to completely overlap with the partition 152, the partition 152 is used to block the exhaust hole 151. In other words, during the movement of the outer sealing ring 160, one exhaust hole 151 in the outer sealing ring 160 overlaps with the adjacent exhaust hole 151 in the inner sealing ring 150. In this way, if the adjacent exhaust holes 151 in the inner sealing ring 150 are all leaking points, it will affect the judgment of the leaking position and the accuracy of the marking. The following is a detailed description:

[0042] Return to Figure 4 and Figure 5As shown, the exhaust hole 151 provided on the outer sealing ring 160 is connected to the air guide box 170 fixedly connected to the outer sealing ring 160, and the air guide box 170 is provided with an ejection part 180 and a contraction part 200 inside. The ejection part 180 is connected to the contraction part 200, and a marking device 190 is provided at the end of the contraction part 200 away from the outer sealing ring 160. When the exhaust hole 151 on the outer sealing ring 160 rotates to coincide with the exhaust hole 151 on the inner sealing ring 150, the overflowing gas pushes the contraction part 200 to move, and the contraction part 200 squeezes the air at the connection between the ejection part 180 and the contraction part 200, and the ejection part 180 presses the marking device 190 to rotate the marking device 190 and mark the outer wall of the pump housing 120. In this way, the leakage position is tested by continuously rotating the outer sealing ring 160, which is convenient for observation by a straight pipe, improves the accuracy of detection, and facilitates accurate judgment of the leakage position.

[0043] exist Figure 4 , Figure 5 , Figure 7 Based on and combined with Figure 6 As shown, an exhaust chamber 171 communicating with the exhaust hole 151 in the outer sealing ring 160 is provided inside the air guide box 170, a compression chamber 172 is further provided inside the air guide box 170 below the exhaust chamber 171, a conduit 173 is communicated between the compression chamber 172 and the exhaust chamber 171, a contraction portion 200 is located inside the exhaust chamber 171, the contraction portion 200 includes a piston push rod 210 and a piston head 220 coaxially connected to the piston push rod 210, the piston push rod 210 passes through the air guide box 170 and is rotatably connected to the marking device 190, the piston head 220 is sleeved and matched with the inner wall of the exhaust chamber 171, and the piston head 220 is located at the end of the exhaust chamber 171 for blocking the inside of the exhaust chamber 171 to limit the overflow of gas (wherein, Figure 6 The arrows in the figure represent the flow direction of the gas. The gas is discharged from the exhaust hole 151 and passes through the exhaust chamber 171 and the conduit 173 in sequence and enters the compression chamber 172).

[0044] In this way, when the exhaust holes 151 in the inner sealing ring 150 and the outer sealing ring 160 overlap with each other, the leaking point is discharged from the exhaust hole 151 of the inner sealing ring 150. At this time, since the exhaust holes 151 that overlap with each other cooperate with the piston head 220 to achieve sealing, the piston head 220 pushes the air in the exhaust chamber 171 and the conduit 173 into the compression chamber 172 under the push of the gas. In this process, since the piston head 220 away from one end of the piston push rod 210 is fixedly connected with the return spring 174, the return spring 174 is located in the exhaust chamber 171, and the end of the return spring 174 is fixedly connected to the inner wall of the exhaust chamber 171, so, as the piston head 220 moves, the gas overcomes the elastic potential energy of the return spring 174 to compress the return spring 174, and the elastic potential energy increases, and the piston push rod 210 drives the marking device 190 to mark on the pump housing 120.

[0045] It should be disclosed that: the marking device 190 belongs to the prior art and is only used for the convenience of observation by the inspection personnel. The marking device 190 includes a housing, a pen body and a knob. Before the test, the pen body is placed in the housing. After the appropriate angle is adjusted, the pen body is fixed by the knob, and the housing is rotatably connected to the piston push rod 210. Fig. 9 shown.

[0046] When the exhaust hole 151 is detected as a leakage point, the marking device 190 marks it and forms a horizontal line on the outside of the pump housing 120 as the piston push rod 210 moves. In this way, the arc line formed by multiple leakage points on the cross section of the pump housing 120 is combined, which is similar to detecting the leakage position through coordinates, thereby improving the accuracy of detection and facilitating the determination of the positions of different leakage points.

[0047] It should be noted that: in order to improve the accuracy of the judgment of the leak point, the denser the vent holes 151 in each inner sealing ring 150, the more accurate the position of the leak point detected. In addition, when the gas flow rate at the leak point is large, the size of the crack at the position can be judged by observing the speed of movement of the marking device 190, so as to trim the leak point later.

[0048] Furthermore, due to the rotational connection between the marking device 190 and the piston push rod 210, the pen body is easily rotated when marking, causing the pen body to separate from the outer wall of the pump housing 120. For this reason, on the basis of the above structure, the structure of the ejection part 180 is disclosed, and the ejection part 180 includes a limit rod 181 and a piston plate 182 coaxially connected to the limit rod 181. The piston plate 182 is sleeved and matched with the inner wall of the compression chamber 172, and the piston plate 182 is away from the conduit 173 under normal conditions. The end of the limit rod 181 away from the piston plate 182 is fixedly connected with a baffle 183. The baffle 183 is used to abut against the marking device 190 when the marking device 190 is marking, so that the marking device 190 is tightly attached to the outer wall of the pump housing 120, thereby preventing the marking device 190 and the piston push rod 210 from loosening during marking ( Fig. 9 The arrow in the figure indicates that the marking device 190 rotates during the movement of the piston push rod 210).

[0049] In addition, in order to provide power to the piston plate 182, when the piston head 220 pushes the air in the exhaust chamber 171 and the conduit 173 to the compression chamber 172, the gas entering the compression chamber 172 is used to provide thrust for the piston plate 182, so that the limit rod 181 pushes the baffle 183 to block the pen body, thereby ensuring that the horizontal line marked on the outer wall of the pump housing 120 is clearly visible, so as to facilitate the later determination of the location of the leakage point.

[0050] Considering that the two exhaust holes 151 are always in the overlapping state, that is, the outer sealing ring 160 is in a stationary state, the piston push rod 210 is in the state of pulling the marking device 190 to move, and the compression chamber 172 is resisted by the gas delivered to the compression chamber 172. This will cause the marking device 190 to be unable to move, resulting in a shorter horizontal line of the mark. To this end, an airbag 175 is provided at the bottom of the air guide box 170 near the conduit 173. The airbag 175 is connected to the compression chamber 172. As the gas is continuously transported to the compression chamber 172 for storage, at the same time, the marking device 190 can exert an opposite force on the baffle 183, so that the limiting rod 181 pushes the piston plate 182 to move in the opposite direction, that is, under the action of the piston head 220 and the piston plate 182, the gas transported to the compression chamber 172 is gradually discharged into the airbag 175 for storage, so that the piston head 220 cooperates with the limiting rod 181 to push the airflow in the compression chamber 172 into the airbag 175, so that the airbag 175 is filled.

[0051] Furthermore, because an air vent pipe 176 is provided on the outer sealing ring 160 near the joint between the inner sealing ring 150 and the outer sealing ring 160, and the air vent pipe 176 is connected to the exhaust hole 151 in the outer sealing ring 160, during the process of the airflow flowing in the exhaust hole 151 pushing the piston head 220 to transport air to the airbag 175, the airflow is divided into two streams, one airflow is discharged from the air vent pipe 176, and the other airflow is used to push the piston head 220 to move, so that the piston head 220 gradually returns to its initial position.

[0052] That is to say, the gas in the compression chamber 172 is transported to the airbag 175, causing the airbag 175 to gradually expand. At this time, the air release pipe 176 acts as a buffer to ensure that the pen body is tightly attached to the outer wall of the pump housing 120 while the baffle 183 restricts the pen body. In the process of the piston push rod 210 driving the pen body to move, the limit rod 181 will not stop, but move in the same direction as the piston push rod 210 at a speed lower than that of the piston push rod 210, so that the pen body marks a clear horizontal line on the outer wall of the pump housing 120, so as to facilitate the subsequent determination of the leakage position and improve the accuracy of the detection.

[0053] When the return spring 174 is compressed to the maximum stroke, the gas inside the pump housing 120 is discharged from the vent pipe 176. Under the action of the return spring 174 and the air bag 175, the piston head 220 and the piston plate 182 move in the opposite direction until they return to their initial positions. The marking device 190 gradually separates from the pump housing 120 during the reverse movement, thereby preventing the pen body from still contacting the outer wall of the pump housing 120 when the pen body rotates to detect the next leakage point.

[0054] After the leak point detection is completed, repeat the above steps to detect the next leak point until all leak points are marked.

[0055] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A pump body sealing detection device, comprising a test bench (100) and a support frame (101) arranged on the test bench (100), the support frame (101) being provided with a fixing ring (121) for fixing a pump housing (120), and an air supply device (110) being provided on the upper surface of the test bench (100) near the support frame (101), characterized in that: The pump housing (120) is provided with an inner sealing ring (150) on the outside, and a plurality of exhaust holes (151) are provided on the inner sealing ring (150). The inner sealing ring (150) is provided with an outer sealing ring (160) on the outside, and the outer sealing ring (160) is also provided with exhaust holes (151). A bracket (130) fixedly connected to the support frame (101) is provided on the outside of the outer sealing ring (160). A power unit (140) for driving the outer sealing ring (160) to rotate is fixedly provided on the top of the bracket (130). The exhaust holes (151) provided on the outer sealing ring (160) are connected to an air guide box (170) fixedly connected to the outer sealing ring (160). The air guide box (170) is provided with a plurality of exhaust holes (151) on the inner sealing ring (150). 0) is provided with an ejector portion (180) and a contraction portion (200) inside, the ejector portion (180) is connected to the contraction portion (200), and a marking device (190) is provided at the end of the contraction portion (200) away from the outer sealing ring (160), when the exhaust hole (151) on the outer sealing ring (160) rotates to overlap with the exhaust hole (151) on the inner sealing ring (150), the overflowing gas pushes the contraction portion (200) to move, and the contraction portion (200) squeezes the air at the connection point between the ejector portion (180) and the contraction portion (200), and the ejector portion (180) presses against the marking device (190), so that the marking device (190) rotates and marks on the outer wall of the pump housing (120); An exhaust chamber (171) is provided inside the air guide box (170) and is connected to the exhaust hole (151) in the outer sealing ring (160). A compression chamber (172) is also provided inside the air guide box (170) below the exhaust chamber (171). A conduit (173) is connected between the compression chamber (172) and the exhaust chamber (171). The contraction portion (200) is located inside the exhaust chamber (171). The contraction portion (200) comprises a piston push rod (210) and a piston head (220) coaxially connected to the piston push rod (210). The piston push rod (210) passes through the air guide box (170) and is rotatably connected to the marking device (190). The piston head (220) is sleeved and matched with the inner wall of the exhaust chamber (171). The piston head (220) is located at the end of the exhaust chamber (171) and is used to block the inside of the exhaust chamber (171) to limit the overflow of gas. The ejection portion (180) comprises a limiting rod (181) and a piston plate (182) coaxially connected to the limiting rod (181); the piston plate (182) is sleeved and matched with the inner wall of the compression chamber (172); the piston plate (182) is away from the conduit (173) in a normal state; the end of the limiting rod (181) away from the piston plate (182) is fixedly connected with a baffle (183); the baffle (183) is used to abut against the marking device (190) when the marking device (190) is marking, so that the marking device (190) is in close contact with the outer wall of the pump housing (120); An air bag (175) is provided at the bottom of the air guide box (170) near the conduit (173), and the air bag (175) is in communication with the compression chamber (172). As gas is continuously delivered to the compression chamber (172) for storage, the piston head (220) cooperates with the limiting rod (181) to push the airflow in the compression chamber (172) into the air bag (175), so that the air bag (175) is filled. An air release pipe (176) is provided on the outer sealing ring (160) near the joint between the inner sealing ring (150) and the outer sealing ring (160). The air release pipe (176) is connected to the exhaust hole (151) in the outer sealing ring (160). In the process of the airflow flowing in the exhaust hole (151) pushing the piston head (220) to transport air to the airbag (175), the airflow is divided into two streams, one of which is discharged from the air release pipe (176) and the other is used to push the piston head (220) to move, so that the piston head (220) gradually returns to its initial position.

2. The pump body sealing detection device according to claim 1, characterized in that: The power unit (140) comprises a motor (141) and a gear set (142); the motor (141) is fixed to the top end of the bracket (130); the motor (141) is used to drive the gear set (142) to rotate; the power unit (140) is meshed with the outer sealing ring (160) via the gear set (142).

3. The pump body sealing detection device according to claim 1, characterized in that: A partition plate (152) is provided between two adjacent exhaust holes (151) in the inner sealing ring (150); the width of the partition plate (152) is set to be the same as that of the exhaust hole (151); when the exhaust hole (151) in the outer sealing ring (160) moves to completely overlap with the partition plate (152), the partition plate (152) is used to block the exhaust hole (151).

4. The pump body sealing detection device according to claim 1, characterized in that: A return spring (174) is fixedly connected to the piston head (220) at one end away from the piston push rod (210); the return spring (174) is located in the exhaust chamber (171), and an end of the return spring (174) is fixedly connected to the inner wall of the exhaust chamber (171).

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