Filter element air tightness detection device

Abstract

The utility model relates to a filter element air tightness detection device. The device comprises a base; the filter element fixing structure is fixedly arranged on the base; the connecting plate is slidably connected to the base, and the connecting plate and the filter element fixing structure are sequentially arranged in the first direction; the first driving assembly comprises a first seat body and a first output shaft; the first connector is fixedly arranged on the first output shaft, and a first vent hole and a second vent hole are formed in the first connector; the second driving assembly comprises a second seat body and a second output shaft, and the second seat body and the first seat body are sequentially arranged in the sliding direction of the connecting plate; the second connector is fixedly arranged on the second output shaft, and a third vent hole and a fourth vent hole are formed in the second connector; the first seat body and the second seat body are fixedly arranged on the connecting plate, and the first output shaft and the second output shaft can move in the first direction; and the pressure gauge is used for fixedly blocking any one of the third vent hole and the fourth vent hole. The filter element air tightness detection device can detect the air tightness of the whole waterway.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of filter core air tightness detection, in particular to a filter core air tightness detection device. BACKGROUND

[0002] The manufacturing process of the filter core is as follows: a filter bottle and a filter core cover are manufactured by an injection molding machine, then an inner core is installed into the filter bottle, and finally the filter bottle and the filter core cover are sealed by hot pressing or welding, wherein the filter bottle and the filter core cover are connected together to form a filter core shell. At present, when detecting the air tightness of the filter core, compressed air is usually introduced into the water inlet and the water outlet of the filter core by using an air source, and then the filter core is immersed in water, and whether bubbles appear in the water is observed. If bubbles appear in the water, it is determined that the air tightness of the filter core is unqualified; if no bubbles appear in the water, it is determined that the air tightness of the filter core is qualified. The filter core has a water channel, and in a common filter core, the filter core shell participates in the formation of the water channel. The above-mentioned method for detecting the air tightness of the filter core can only detect the air tightness of the filter core shell, and cannot detect the air tightness of the entire water channel. The inner core is mainly fixed with the filter bottle through a sealing ring, if the sealing effect of the sealing ring is poor, the water in the water channel will leak out through the place where the sealing ring is located, and the water that leaks out of the water channel will flow out without being filtered by the inner core, which will reduce the purification effect on the water. Therefore, it is necessary to provide a filter core air tightness detection device that can detect the air tightness of the filter core shell and the air tightness of the entire water channel. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a filter core air tightness detection device in view of the above problems.

[0004] In order to solve the above problems, the technical scheme of the present application is as follows:

[0005] A filter core air tightness detection device for detecting the air tightness of a filter core, the filter core having a water channel, both ends of the water channel being a water inlet and a water outlet respectively, the filter core air tightness detection device comprising:

[0006] a base;

[0007] a filter core fixing structure fixedly arranged on the base;

[0008] a connecting plate slidably connected to the base, and arranged along a first direction in sequence with the filter core fixing structure, the connecting plate having an included angle between the sliding direction and the first direction;

[0009] a first driving assembly comprising a first seat body and a first output shaft, the first seat body being fixedly arranged on the connecting plate, and the first output shaft being movable along the first direction;

[0010] a first joint fixedly arranged on the first output shaft, the first joint being provided with a first air hole for communicating with the water inlet and a second air hole for communicating with the water outlet.

[0011] a second driving assembly comprising a second seat body and a second output shaft, the second seat body being fixed to the connecting plate and arranged in sequence with the first seat body along the sliding direction of the connecting plate, the second output shaft being movable along the first direction;

[0012] a second joint fixed to the second output shaft, the second joint being provided with a third air hole for communicating with the water inlet and a fourth air hole for communicating with the water outlet; and

[0013] a pressure gauge fixedly blocking any one of the third air hole and the fourth air hole for testing the air pressure in the water path.

[0014] The filter core air tightness detection device has at least the following beneficial effects:

[0015] In the application of the filter core air tightness detection device, the air tightness of the filter core shell can be detected according to the following process: fixing the filter core on the filter core fixing structure, then sliding the connecting plate to make the first joint opposite to the filter core fixing structure, so that the first joint and the filter core are opposite. Then, the first output shaft moves along the first direction towards the filter core fixing structure until the first air hole communicates with the water inlet and the second air hole communicates with the water outlet. Then, the filter core is aerated through the first air hole and / or the second air hole, and the filter core is immersed in water. Observe whether there are air bubbles in the water. If there are air bubbles in the water, the air tightness of the filter core shell is unqualified; if there are no air bubbles in the water, the air tightness of the filter core shell is qualified.

[0016] After confirming that the air tightness of the filter core shell is qualified, the air tightness of the entire water path can also be detected according to the following process: fixing the filter core on the filter core fixing structure, then sliding the connecting plate to make the second joint opposite to the filter core fixing structure, so that the second joint and the filter core are opposite. Then, the second output shaft moves along the first direction towards the filter core fixing structure until the third air hole communicates with the water inlet and the fourth air hole communicates with the water outlet. Then, the filter core is aerated through one of the third air hole and the fourth air hole which is not blocked by the pressure gauge. After stopping aeration, observe whether the air pressure in the water path measured by the pressure gauge continues to decrease. If the air pressure in the water path remains unchanged, the air tightness of the entire water path is qualified; if the air pressure in the water path continues to decrease, the air tightness of the entire water path is unqualified.

[0017] In summary, the filter core air tightness detection device can detect the air tightness of the filter core shell and the air tightness of the entire water path.

[0018] In one of the embodiments, the pressure gauge fixedly blocks the fourth air hole.

[0019] In this way, in the process of detecting the air tightness of the water path, even if impurities exist in the gas flowing into the filter element, the impurities can be blocked by the filter element, and the outlet can be prevented from accumulating impurities in the process of detecting the air tightness of the water path.

[0020] In one of the embodiments, the first joint is provided with a plurality of first air holes and a plurality of second air holes, the second joint is provided with a plurality of third air holes and a plurality of fourth air holes, and the first air holes, the second air holes, the third air holes and the fourth air holes are arranged one by one in correspondence; the pressure gauge is provided with a plurality of pressure gauges, and one of the corresponding third air hole and fourth air hole is fixedly blocked by one of the pressure gauges.

[0021] In this way, the filter element air tightness detection device can be used to detect filter elements with multiple water paths, and can also be used to simultaneously detect multiple filter elements with only one water path.

[0022] In one of the embodiments, the pressure gauge has a dial, and the dials of two adjacent pressure gauges are arranged in a staggered manner.

[0023] In this way, the dial of one pressure gauge can be prevented from blocking the dial of another pressure gauge, facilitating the user to read the measurement results of the pressure gauges.

[0024] In one of the embodiments, the sliding direction of the connecting plate is perpendicular to the first direction.

[0025] In this way, it is beneficial to make the filter element air tightness detection device compact in structure.

[0026] In one of the embodiments, the filter element air tightness detection device further comprises a third driving assembly, the third driving assembly comprises a third seat body and a third output shaft, the third seat body is fixedly arranged on the base, the third output shaft is movable along the sliding direction of the connecting plate, and the connecting plate is fixedly connected to the third output shaft.

[0027] In this way, the third driving assembly can be used to push the connecting plate to slide.

[0028] In one of the embodiments, the third driving assembly comprises a plurality of third output shafts, and the plurality of third output shafts are arranged in parallel with each other.

[0029] In this way, it is beneficial to the third driving assembly to smoothly push the connecting plate to slide.

[0030] In one of the embodiments, the third driving assembly is a cylinder, the sliding direction of the connecting plate is perpendicular to the first direction, the distance between the axis of the first output shaft and the axis of the second output shaft is equal to the stroke of the third output shaft; in the state that the third output shaft is located at the starting position, one of the first joint and the second joint is opposite to the filter core fixing structure; in the state that the third output shaft is located at the ending position, the other of the first joint and the second joint is opposite to the filter core fixing structure.

[0031] In this way, the third driving assembly can push the first joint and the second joint to the positions opposite to the filter core fixing structure respectively.

[0032] In one of the embodiments, the filter core air tightness detection device further comprises a sliding rail and a sliding block, the sliding rail is fixedly arranged on the base, and the sliding block is slidably connected to the sliding rail, and the connecting plate is fixedly arranged on the sliding block.

[0033] In this way, the sliding rail and the sliding block are arranged between the connecting plate and the base, so that the connecting plate can slide stably relative to the base.

[0034] In one of the embodiments, two sliding rails are arranged, four sliding blocks are arranged, the two sliding rails are arranged in parallel, two sliding blocks are arranged on each sliding rail, and each sliding block is fixedly connected to the connecting plate.

[0035] In this way, the connecting plate can slide stably relative to the base. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 FIG. 1 is a perspective view of a filter core air tightness detection device according to an embodiment of the present application;

[0037] Figure 2 FIG. 2 is a perspective view of the filter core air tightness detection device shown in FIG. 1 from another angle; Figure 1

[0038] FIG. 3 is a perspective view of the filter core air tightness detection device shown in FIG. 1 from another angle; Figure 3 Figure 1 FIG. 4 is a side view of the filter core air tightness detection device shown in FIG. 1;

[0039] Figure 4 Figure 1 FIG. 5 is a sectional view of the filter core air tightness detection device shown in FIG. 1 along the sectional line A-A;

[0040] Figure 5 FIG. 6 is a sectional view of the filter core air tightness detection device shown in FIG. 1 along the sectional line B-B; Figure 4

[0041] FIG. 7 is a sectional view of the filter core air tightness detection device shown in FIG. 1 along the sectional line C-C; and Figure 6 Figure 1 ​​​Schematic view of the first joint;

[0042] Figure 7 For Figure 1 Schematic view of the connection between the second joint and the pressure gauge;

[0043] Figure 8 For Figure 1 Schematic view of the connection between the filter element and the filter element air tightness detection device shown;

[0044] Figure 9 For Figure 8 Schematic view of the filter element.

[0045] Reference signs:

[0046] 1, filter element air tightness detection device; 11, base; 12, filter element fixing structure; 13, connecting plate; 14, first driving assembly; 141, first seat body; 142, first output shaft; 15, first joint; 151, first air hole; 152, second air hole; 16, second driving assembly; 161, second seat body; 162, second output shaft; 17, second joint; 171, third air hole; 172, fourth air hole; 18, pressure gauge; 181, dial; 19, third driving assembly; 191, third seat body; 192, third output shaft; 201, sliding rail; 202, sliding block; 2, filter element; 21, waterway; 211, water inlet; 212, water outlet. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first", "second", "third", etc. are used herein for descriptive purposes only and are not to be construed as indicating or implying relative importance or a meaningful distinction. It is therefore to be understood that a "first", "second", "third", etc. feature can implicitly or explicitly include at least one of the feature. In the description of the present application, the meaning of "a plurality" is at least two, for example, two, three, etc., unless explicitly specified and limited otherwise.

[0050] In the present application, unless specifically and particularly defined otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, they can be fixedly connected, or detachably connected, or integrated; they can be mechanically connected, or electrically connected; they can be directly connected, or indirectly connected through an intermediate medium; they can be the internal communication of two elements or the interaction relationship between two elements, unless specifically defined otherwise. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the present application, unless specifically and particularly defined otherwise, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or it only means that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or it only means that the horizontal height of the first feature is less than that of the second feature.

[0052] It should be noted that when an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not the only embodiment.

[0053] Referring to Figures 1 to 9 The present application provides a filter element air tightness detection device 1 for detecting the air tightness of a filter element 2. The filter element 2 to be detected has a waterway 21, and the two ends of the waterway 21 are respectively a water inlet 211 and a water outlet 212. The filter element air tightness detection device 1 comprises a base 11, a filter element fixing structure 12, a connecting plate 13, a first driving assembly 14, a first joint 15, a second driving assembly 16, a second joint 17 and a pressure gauge 18. The filter element fixing structure 12 is fixedly arranged on the base 11. The connecting plate 13 is slidably connected to the base 11 and is arranged along a first direction (i.e.Figure 9 The filter core 2 is fixed on the filter core fixing structure 12, and the first joint 15 and the second joint 17 are arranged in sequence along the length direction of the filter core 2. The sliding direction of the connecting plate 13 and the first direction form an included angle. The first driving assembly 14 comprises a first seat body 141 and a first output shaft 142. The first seat body 141 is fixed on the connecting plate 13, and the first output shaft 142 is movable along the first direction. The first joint 15 is fixed on the first output shaft 142, and the first joint 15 is provided with a first air hole 151 for connecting the water inlet 211 and a second air hole 152 for connecting the water outlet 212. The second driving assembly 16 comprises a second seat body 161 and a second output shaft 162. The second seat body 161 is fixed on the connecting plate 13 and arranged in sequence with the first seat body 141 along the sliding direction of the connecting plate 13, and the second output shaft 162 is movable along the first direction. The second joint 17 is fixed on the second output shaft 162, and the second joint 17 is provided with a third air hole 171 for connecting the water inlet 211 and a fourth air hole 172 for connecting the water outlet 212. The pressure gauge 18 is fixed to block any one of the third air hole 171 and the fourth air hole 172, and is used to test the air pressure in the water path 21.

[0054] In the application of the filter core air tightness detection device 1, the air tightness of the filter core 2 shell can be detected according to the following process: the filter core 2 is fixed on the filter core fixing structure 12, and then the connecting plate 13 is slid to make the first joint 15 opposite to the filter core fixing structure 12, so that the first joint 15 and the filter core 2 are opposite. Then, the first output shaft 142 moves along the first direction towards the filter core fixing structure 12 until the first air hole 151 is connected with the water inlet 211 and the second air hole 152 is connected with the water outlet 212. Then, the filter core 2 is aerated through the first air hole 151 and / or the second air hole 152, and the filter core 2 is immersed in water. It is observed whether there are air bubbles in the water. If there are air bubbles in the water, the air tightness of the filter core 2 shell is unqualified; if there are no air bubbles in the water, the air tightness of the filter core 2 shell is qualified.

[0055] After confirming that the air tightness of the filter core 2 shell is qualified, the air tightness of the entire water path 21 can be detected according to the following process: the filter core 2 is fixed on the filter core fixing structure 12, and then the connecting plate 13 is slid to make the second joint 17 opposite to the filter core fixing structure 12, so that the second joint 17 and the filter core 2 are opposite. Then, the second output shaft 162 moves along the first direction towards the filter core fixing structure 12 until the third air hole 171 is connected with the water inlet 211 and the fourth air hole 172 is connected with the water outlet 212. Then, the filter core 2 is aerated through one of the third air hole 171 and the fourth air hole 172 which is not blocked by the pressure gauge 18. After stopping the aeration, it is observed whether the air pressure in the water path 21 measured by the pressure gauge 18 continues to decrease. If the air pressure in the water path 21 remains unchanged, the air tightness of the entire water path 21 is qualified; if the air pressure in the water path 21 continues to decrease, the air tightness of the entire water path 21 is unqualified.

[0056] In summary, the filter cartridge air tightness detection device 1 can detect the air tightness of the filter cartridge 2 shell and the air tightness of the entire water path 21.

[0057] When the filter cartridge air tightness detection device 1 is used to detect the air tightness of the filter cartridge 2 shell, the first air hole 151 and the second air hole 152 can be connected to the air source respectively to ventilate the filter cartridge 2, or one of the first air hole 151 and the second air hole 152 can be plugged and the other can be connected to the air source to ventilate the filter cartridge 2.

[0058] Referring to Figures 1 to 5 and Figure 7 , the pressure gauge 18 is fixedly plugged the fourth air hole 172. In other words, the filter cartridge 2 is ventilated through the third air hole 171 during the detection of the air tightness of the water path 21. In this way, during the detection of the air tightness of the water path 21, even if there are impurities in the gas introduced into the filter cartridge 2, the impurities will be blocked by the filter cartridge 2, and the outlet 212 can be prevented from accumulating impurities during the detection of the air tightness of the water path 21.

[0059] Referring to Figure 3 , Figure 6 and Figure 7 , the first joint 15 is provided with a plurality of first air holes 151 and a plurality of second air holes 152, and the second joint 17 is provided with a plurality of third air holes 171 and a plurality of fourth air holes 172, and the first air holes 151, the second air holes 152, the third air holes 171 and the fourth air holes 172 are arranged one by one. The pressure gauge 18 is provided with a plurality of corresponding third air holes 171 and fourth air holes 172, one of which is fixedly plugged by one pressure gauge 18. In other words, the number of pressure gauges 18 is half the number of third air holes 171. In this way, the filter cartridge air tightness detection device 1 can be used to detect filter cartridges 2 with multiple water paths 21, and can also be used to simultaneously detect multiple filter cartridges 2 with only one water path 21.

[0060] Referring to Figure 3 , Figure 6 and Figure 7The first joint 15 is provided with two first air holes 151 and two second air holes 152, and the second joint 17 is provided with two third air holes 171 and two fourth air holes 172. Each fourth air hole 172 is fixedly plugged by a pressure gauge 18. When detecting the filter element 2 with two water paths 21, one set of corresponding first air holes 151 and second air holes 152 are connected to one water path 21, and another set of corresponding first air holes 151 and second air holes 152 are connected to the other water path 21, so as to detect the air tightness of the filter element 2 shell; after confirming that the air tightness of the filter element 2 shell is qualified, one set of corresponding third air holes 171 and fourth air holes 172 are connected to one water path 21, and another set of corresponding third air holes 171 and fourth air holes 172 are connected to the other water path 21, so as to detect the air tightness of each water path 21.

[0061] In other embodiments, the first air holes 151, the second air holes 152, the third air holes 171 and the fourth air holes 172 can also be provided with 3 / 4 / 5 / 6 respectively.

[0062] Referring to Figure 7 The pressure gauge 18 has a dial 181. In embodiments provided with multiple pressure gauges 18, the dials 181 of two adjacent pressure gauges 18 are arranged staggered. In this way, the dial 181 of one pressure gauge 18 can be prevented from shielding the dial 181 of another pressure gauge 18, so as to facilitate the user to read the measurement results of the pressure gauges 18.

[0063] Preferably, the sliding direction of the connecting plate 13 is perpendicular to the first direction. This is conducive to making the filter element air tightness detection device 1 compact in structure.

[0064] Referring to Figure 1 and Figure 2 The filter element air tightness detection device 1 further comprises a third driving assembly 19. The third driving assembly 19 comprises a third seat body 191 and a third output shaft 192. The third seat body 191 is fixedly arranged on the base 11, and the third output shaft 192 is movable along the sliding direction of the connecting plate 13. The connecting plate 13 is fixedly connected to the third output shaft 192. In this way, the third driving assembly 19 can push the connecting plate 13 to slide.

[0065] Referring to Figure 1 and Figure 2 The third driving assembly 19 comprises multiple third output shafts 192, and the multiple third output shafts 192 are arranged parallel to each other. In this way, the third driving assembly 19 can stably push the connecting plate 13 to slide. Exemplarily, the third driving assembly 19 comprises 2 / 3 / 4 third output shafts 192.

[0066] Referring to Figure 1 and Figure 2The third drive assembly 19 is a cylinder, and the third output shaft 192 is a piston rod. The sliding direction of the connecting plate 13 is perpendicular to the first direction, and the distance between the axis of the first output shaft 142 and the axis of the second output shaft 162 is equal to the stroke of the third output shaft 192. When the third output shaft 192 is in the initial position, one of the first connector 15 and the second connector 17 is directly opposite the filter element fixing structure 12. When the third output shaft 192 is in the terminated position, the other of the first connector 15 and the second connector 17 is directly opposite the filter element fixing structure 12. This facilitates the third drive assembly 19 to push the first connector 15 and the second connector 17 to positions directly opposite the filter element fixing structure 12.

[0067] It is understandable that the stroke of the third output shaft 192 is the distance that the third output shaft 192 moves from the starting position to the ending position.

[0068] exist Figure 1 In the embodiment shown, both the first drive assembly 14 and the second drive assembly 16 are cylinders, and both the first output shaft 142 and the second output shaft 162 are piston rods.

[0069] In other embodiments, the first drive assembly 14, the second drive assembly 16, and the third drive assembly 19 may also be hydraulic cylinders or linear motors.

[0070] See Figure 1 The filter element airtightness testing device 1 also includes a slide rail 201 and a slider 202. The slide rail 201 is fixed to the base 11, and the slider 202 is slidably connected to the slide rail 201. The connecting plate 13 is fixed to the slider 202. In this way, the connecting plate 13 and the base 11 are slidably connected through the slide rail 201 and the slider 202, which is beneficial for the stable sliding of the connecting plate 13 relative to the base 11.

[0071] See Figure 1 There are two slide rails 201 and four sliders 202. The two slide rails 201 are arranged in parallel, and two sliders 202 are provided on each slide rail 201. Each slider 202 is fixedly connected to the connecting plate 13. This facilitates the stable sliding of the connecting plate 13 relative to the base 11.

[0072] In other embodiments, a sliding groove may be provided on the base 11. The sliding groove is a T-shaped groove or a dovetail groove. A part of the connecting plate 13 is located in the sliding groove and is adapted to the sliding groove to form a sliding connection with the base 11.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The above-described embodiments are merely illustrative of several embodiments of the present application, which are described in more detail and in a specific manner, but should not be construed as limiting the scope of protection of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A filter element air tightness detection device for detecting air tightness of a filter element (2), the filter element (2) having a waterway (21), two ends of the waterway (21) being a water inlet (211) and a water outlet (212) respectively, characterized in that, The filter core airtightness detection device comprises a base (11), a filter core fixing structure (12) fixedly arranged on the base (11), a connecting plate (13) slidably connected to the base (11) and sequentially arranged with the filter core fixing structure (12) along a first direction, an included angle being formed between a sliding direction of the connecting plate (13) and the first direction, a first driving assembly (14) comprising a first seat body (141) and a first output shaft (142), the first seat body (141) being fixedly arranged on the connecting plate (13), the first output shaft (142) being movable along the first direction, a first joint (15) fixedly arranged on the first output shaft (142), the first joint (15) being provided with a first air hole (151) for connecting the water inlet (211) and a second air hole (152) for connecting the water outlet (212), a second driving assembly (16) comprising a second seat body (161) and a second output shaft (162), the second seat body (161) being fixedly arranged on the connecting plate (13) and sequentially arranged with the first seat body (141) along the sliding direction of the connecting plate (13), the second output shaft (162) being movable along the first direction, a second joint (17) fixedly arranged on the second output shaft (162), the second joint (17) being provided with a third air hole (171) for connecting the water inlet (211) and a fourth air hole (172) for connecting the water outlet (212), and a pressure gauge (18) fixedly sealing any one of the third air hole (171) and the fourth air hole (172) and used for testing the air pressure in the water channel (21). The pressure gauge (18) fixedly seals the fourth air hole (172). The first joint (15) is provided with a plurality of first air holes (151) and a plurality of second air holes (152), the second joint (17) is provided with a plurality of third air holes (171) and a plurality of fourth air holes (172), the first air holes (151), the second air holes (152), the third air holes (171) and the fourth air holes (172) are arranged one by one in correspondence, the pressure gauge (18) is provided with a plurality of pressure gauges, one of the corresponding third air hole (171) and fourth air hole (172) is fixedly sealed by one of the pressure gauges (18). The pressure gauge (18) has a dial (181), and the dials (181) of two adjacent pressure gauges (18) are arranged in a staggered manner. The sliding direction of the connecting plate (13) is perpendicular to the first direction. The filter core airtightness detection device further comprises a third driving assembly (19), the third driving assembly (19) comprising a third seat body (191) and a third output shaft (192), the third seat body (191) being fixedly arranged on the base (11), the third output shaft (192) being movable along the sliding direction of the connecting plate (13), and the connecting plate (13) being fixedly connected to the third output shaft (192). ​ ​ ​ 2. The filter cartridge air tightness testing device of claim 1, wherein, ​ 3. The filter cartridge air tightness testing device of claim 1, wherein, ​ 4. The filter cartridge air tightness testing device of claim 3, wherein, ​ 5. The filter cartridge air tightness testing device of claim 1, wherein, ​ 6. The filter cartridge air tightness testing device of claim 1, wherein, ​ 7. The filter cartridge air tightness testing device of claim 6, wherein, The third driving assembly (19) comprises a plurality of third output shafts (192), and the plurality of third output shafts (192) are arranged in parallel with each other.

8. The filter cartridge air tightness testing device of claim 7, wherein, The third driving assembly (19) is a cylinder, the sliding direction of the connecting plate (13) is perpendicular to the first direction, the distance between the axis of the first output shaft (142) and the axis of the second output shaft (162) is equal to the stroke of the third output shaft (192); in the state that the third output shaft (192) is located at the starting position, one of the first joint (15) and the second joint (17) is opposite to the filter core fixing structure (12); in the state that the third output shaft (192) is located at the terminal position, the other of the first joint (15) and the second joint (17) is opposite to the filter core fixing structure (12).

9. The filter cartridge air tightness testing device of claim 1, wherein, The filter core air tightness detection device further comprises a sliding rail (201) and a sliding block (202), the sliding rail (201) is fixedly arranged on the base (11), and the sliding block (202) is slidably connected to the sliding rail (201); the connecting plate (13) is fixedly arranged on the sliding block (202).

10. The filter cartridge air tightness testing device of claim 9, wherein, The sliding rail (201) is provided with two, the sliding block (202) is provided with four, two sliding rails (201) are arranged in parallel, two sliding blocks (202) are arranged on each sliding rail (201), and each sliding block (202) is fixedly connected with the connecting plate (13).

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