Dry-wet composite leak detection machine for shell

Abstract

The invention relates to the technical field of compressor processing, and discloses a shell dry-wet composite leak detection machine, which comprises a sealing detection mechanism, and the sealing detection mechanism comprises a bearing unit; a top plugging unit is slidably arranged on the bearing unit, a vacuum lifting unit is slidably arranged on the top plugging unit, the vacuum lifting unit comprises a vacuum cover and a lifting part, the lifting part can drive the vacuum cover to ascend and descend, and the top plugging unit is used for sealing the top of the shell and the top of the vacuum cover; a gas path sealing unit is arranged below the top plugging unit, the gas path sealing unit is used for sealing the bottom of the shell and the bottom of the vacuum cover, and the gas path sealing unit is provided with a gas inlet channel communicated with the interior of the shell and a gas exhaust channel communicated with the interior of the vacuum cover; a lateral plugging unit is further arranged on the gas circuit sealing unit and used for sealing the side face of the shell and the side face of the vacuum cover, and a differential pressure sensor is installed between the vacuum cover and the shell. According to the scheme, the precision and reliability of air tightness detection of the shell can be remarkably improved, and interference of external environmental factors on the detection process is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of compressor processing, and in particular to a shell dry-wet composite leak detector. Background Art

[0002] The automotive air conditioning system plays a vital role in modern cars, and its performance directly affects the comfort of the driving environment in the car. The automotive air conditioning compressor is the core driving component of the automotive air conditioning system, and its housing is the key structural component to ensure the normal operation of the compressor.

[0003] In the casting process of automobile air-conditioning compressor housing, there will inevitably be some defects, such as pores, looseness, etc. These defects seriously threaten the air tightness of the housing. If the air tightness of the housing is not good, the cooling or heating effect of the air conditioner will be greatly reduced, and it may even cause compressor failure and shorten its service life, thus affecting the reliability and stability of the entire automobile air-conditioning system. Therefore, testing the air tightness of the housing and ensuring that the quality meets the standards has become a key link in the automobile manufacturing process.

[0004] In the right Figure 1 When the shell 1 shown is tested for air tightness, the commonly used leak detection method is: install the shell 1 on the detection device, and use the detection device to block the bottom, top and side of the shell 1 to form a closed space inside the shell 1, and then inject high-pressure gas into the shell 1. After ventilation, the pressure sensor inside the shell 1 monitors the pressure change inside the shell 1 to determine whether there is a leak in the shell 1. However, this technical solution has significant drawbacks. On the one hand, the pressure change is only monitored by the pressure sensor inside the shell 1, and the detection accuracy is not high. Even if there is a small leak in the shell 1, it is difficult to detect due to the small amount of leaked gas, which undoubtedly increases the risk of missing a small leak. On the other hand, the outside of the shell 1 is exposed to the air, and the detection is easily disturbed by external environmental factors such as atmospheric pressure fluctuations, temperature changes, and air flow.

[0005] In view of the various shortcomings of the existing automobile air-conditioning compressor housing leak detection methods, it is urgent to optimize the leak detection equipment, improve the detection accuracy and effect, lay a solid foundation for the high-quality operation of the automobile air-conditioning system, ensure its stable and efficient operation under various working conditions, and create a comfortable and safe in-car environment for drivers and passengers. Summary of the invention

[0006] The present invention aims to provide a shell dry-wet composite leak detector to improve the accuracy and reliability of shell air tightness detection and reduce the interference of external environmental factors on the detection process.

[0007] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a dry-wet composite leak detector for a shell, including a sealing detection mechanism, which includes a carrying unit; a top sealing unit is slidably arranged on the carrying unit, and a vacuum lifting unit is slidably arranged on the top sealing unit, the vacuum lifting unit includes a vacuum cover and a lifting part, the lifting part can drive the vacuum cover to rise and fall, and the top sealing unit is used to seal the top of the shell and the top of the vacuum cover; an air path sealing unit is arranged below the top sealing unit, the air path sealing unit is used to seal the bottom of the shell and the bottom of the vacuum cover, and the air path sealing unit is provided with an air intake channel communicating with the interior of the shell and an air exhaust channel communicating with the interior of the vacuum cover; the air path sealing unit is also provided with a lateral sealing unit, which is used to seal the side of the shell and the side of the vacuum cover, and a differential pressure sensor is installed between the vacuum cover and the shell.

[0008] The beneficial effects of this scheme are as follows: when performing the air tightness test of the shell, the shell is first placed on the gas path sealing unit, and the bottom of the shell is sealed by the gas path sealing unit, and then the top of the shell is sealed by the top blocking unit to achieve the sealing of the upper and lower ends of the shell. Subsequently, the lifting part drives the vacuum hood to descend and sets its hood outside the shell. At this time, the top of the inside of the vacuum hood is tightly fitted with the top surface of the top blocking unit to complete the sealing of the top of the vacuum hood. At the same time, the bottom of the vacuum hood is sealed by the gas path sealing unit to ensure the sealing of the upper and lower ends of the vacuum hood; then, the side of the shell and the side of the vacuum hood are sealed by the lateral blocking unit, thereby constructing an independent enclosed space inside the shell, and also forming an enclosed interval between the shell and the vacuum hood. Afterwards, high-pressure gas is filled into the shell through the air inlet channel with the help of an inflation device; at the same time, the gas in the vacuum cover is extracted through the exhaust channel with the help of an exhaust device, thereby creating a negative pressure state in the vacuum cover. After the inflation and exhaust processes are completed, the pressure changes in the vacuum cover and the shell are monitored in real time by means of a differential pressure sensor, and whether the leakage of the shell exceeds the specified standard is judged based on the monitoring data, so as to accurately determine whether the air tightness of the shell is qualified.

[0009] Compared with the traditional detection method that only relies on the pressure sensor inside the shell to monitor the pressure change and the outside of the shell is exposed to the air, the leak detection device of the present invention has significant advantages.

[0010] First, by installing a differential pressure sensor between the vacuum cover and the shell and creating a negative pressure environment in the vacuum cover, a comparative monitoring mechanism for the internal and external pressure difference is formed. When there is a small leak in the shell, due to the internal and external pressure difference, the flow of the leaking gas will cause the differential pressure sensor to respond more sensitively, greatly improving the detection accuracy and effectively reducing the risk of missing small leaks. It can accurately capture extremely subtle leaks, ensure the airtightness detection quality of the shell, and provide a solid guarantee for the stable operation of the automotive air-conditioning compressor.

[0011] Secondly, isolating the shell from the external environment avoids interference from external environmental factors such as atmospheric pressure fluctuations, temperature changes, and air flow on the test results. This stable test environment makes the pressure monitoring data more accurate and reliable, and can ensure the consistency and repeatability of the test results regardless of the complex external conditions, thereby greatly improving the stability and reliability of the test, providing strong support for quality control in the automobile manufacturing process, helping to improve the performance and quality of the entire automobile air conditioning system, reducing failures and maintenance costs caused by shell air tightness problems, and ultimately providing drivers and passengers with a more comfortable and reliable in-car environment experience, enhancing the market competitiveness of automobile products.

[0012] In addition, the collaborative working mechanism between the various components of this technical solution not only improves the accuracy and reliability of detection, but also has the characteristics of simple operation and high efficiency. It can meet the needs of efficient detection on automobile production lines, further optimize the process flow of automobile manufacturing, and improve production efficiency and economic benefits.

[0013] Furthermore, the bearing unit includes a top plate, a bearing plate and a plurality of supporting columns, and the top plate and the bearing plate are connected through the supporting columns.

[0014] The beneficial effects of this solution are as follows: the load-bearing unit provided by this technical solution has a stable structure, and the support column connects the top plate and the load-bearing plate, which can effectively disperse the pressure, provide stable support for detection, prevent the equipment from displacement and deformation, and ensure accurate detection. At the same time, its structure is simple, easy to manufacture, assemble and maintain, reduce costs, and improve equipment versatility and production efficiency.

[0015] Furthermore, the top sealing unit includes a No. 1 driving member, a connecting plate, a push plate and a plurality of connecting columns. The No. 1 driving member is installed on the top of the top plate, and its output shaft passes through the top plate and is detachably connected to the connecting plate. The connecting plate and the push plate are fixedly connected through the connecting columns. The push plate is slidably arranged on the support columns. The push plate is provided with a sealing portion on the side close to the supporting plate, and the sealing portion can seal the top of the shell placed in the vacuum cover and the top of the vacuum cover.

[0016] The beneficial effect of this solution is as follows: when the sealing operation is performed on the top of the shell, the No. 1 driving member drives the push plate to slide along the support column toward the load-bearing plate, ensuring that the sealing part is tightly fitted with the top of the shell, achieving the sealing of the top of the shell, and effectively preventing gas leakage, which greatly improves the reliability and stability of the sealing on the top of the shell and lays a solid foundation for subsequent air tightness testing.

[0017] Since the push plate is slidably arranged on the support column and the sealing part is arranged on the side close to the bearing plate, during the process of sealing the top of the shell, the support column can guide the sliding of the push plate, so that the sealing part can accurately and stably seal the top of the shell.

[0018] Furthermore, the blocking part includes a connecting rod and a blocking disk, one end of the connecting rod is fixedly connected to a connecting disk No. 1, and the other end is fixedly connected to a connecting disk No. 2, the connecting disk No. 1 is detachably connected to a side of the push plate close to the supporting plate, the connecting disk No. 2 is detachably connected to the blocking disk, a sealing ring No. 1 is provided on a side of the blocking disk close to the supporting plate, and a sealing ring No. 2 is provided on a side of the blocking disk away from the supporting plate.

[0019] The beneficial effects of this solution are as follows: in this technical solution, since the sealing disk and the No. 2 connecting disk are detachably connected, when it is necessary to detect shells of different models, it is convenient to replace the sealing disk to be suitable for the detection of shells of different models; at the same time, the setting of the No. 1 sealing ring and the No. 2 sealing ring facilitates the sealing of the top of the shell and the top of the vacuum cover, thereby improving the reliability and accuracy of the detection results.

[0020] Compared with connecting the push plate and the sealing disk through a connecting rod, the setting of the No. 1 connecting disk and the No. 2 connecting disk can evenly transfer the pressure applied by the push plate to the sealing disk, so that the sealing disk is subjected to more uniform force during the sealing process, avoiding sealing failure due to excessive local force.

[0021] Furthermore, the lifting part includes a No. 2 driving member and a lifting plate. The No. 2 driving member is installed on the top of the push plate. The driving plate is detachably connected to the output shaft of the No. 2 driving member. A plurality of guide rods are fixedly connected to the side of the driving plate close to the supporting plate. The guide rods pass through the push plate and are fixedly connected to the top of the lifting plate. The vacuum cover is detachably connected to the side of the lifting plate close to the supporting plate.

[0022] The beneficial effect of this scheme is as follows: in the process of setting the vacuum hood outside the shell, the output shaft of the No. 2 drive component contracts, driving the lifting plate and the vacuum hood to descend synchronously, and the vacuum hood is set outside the shell. After the vacuum hood descends into place, the top of the vacuum hood fits tightly with the No. 2 sealing ring, effectively achieving a reliable seal on the top of the vacuum hood, effectively ensuring the airtightness of the detection environment, and laying a solid foundation for accurate leak detection.

[0023] The detachable connection between the vacuum cover and the lifting plate greatly improves the applicability and flexibility of the equipment. When faced with different types of shell inspection tasks, operators can quickly and conveniently replace the appropriate vacuum cover without complicated tools and lengthy debugging processes, greatly shortening the equipment preparation time and switching costs, significantly improving production efficiency, and ensuring that under diverse production needs, this technical solution can always accurately and efficiently complete the airtightness inspection of various types of shells, which greatly enhances the competitiveness and practicality of the equipment in the market and provides strong technical support for the production operations of enterprises.

[0024] Furthermore, a guide unit is provided between the lifting plate and the vacuum cover, and the vacuum cover is mounted on the guide unit.

[0025] The beneficial effect of this solution is that due to the setting of the guide unit, this technical solution can provide precise guidance for the lifting of the lifting part, thereby ensuring that the vacuum cover always maintains a stable and vertical motion trajectory during the lifting process. This can not only effectively avoid the problem of poor sealing caused by the lifting and lowering deviation of the vacuum cover, but also further improve the airtightness of the detection environment and ensure the accuracy and reliability of the leak detection results.

[0026] Furthermore, the air path sealing unit includes a ventilation plate, which is detachably connected to the supporting plate, and a positioning seat is sealed on the ventilation plate. A No. 3 sealing ring and a No. 4 sealing ring are provided on the ventilation plate, and the No. 3 sealing ring and the No. 4 sealing ring are concentrically arranged with the positioning seat, and a No. 1 air inlet hole is provided on the positioning seat, and a No. 2 air inlet hole is provided on the side of the ventilation plate, and the No. 1 air inlet hole is connected with the No. 2 air inlet hole to form an air inlet channel, and a No. 1 exhaust hole is provided on the ventilation plate between the No. 3 sealing ring and the No. 4 sealing ring, and a No. 2 exhaust hole is provided on the side of the ventilation plate, and the No. 1 exhaust hole is connected with the No. 2 exhaust hole to form an exhaust channel.

[0027] The beneficial effects of this solution are as follows: In this technical solution, the ventilation plate and the carrier plate can be detachably connected to facilitate equipment maintenance and component replacement. The positioning seat on the ventilation plate is exquisitely designed and can accurately position the shell to ensure that it is in the standard position during detection, laying a solid foundation for subsequent processes and ensuring accurate and stable detection. The No. 3 sealing ring is concentric with the positioning seat and fits tightly to the bottom of the shell to prevent gas leakage and ensure a high-pressure environment inside the shell. The No. 4 sealing ring meets the sealing requirements of the bottom of the vacuum hood and maintains a stable negative pressure environment. The air intake and exhaust channels provide efficient ways for ventilation inside the shell and exhaust in the vacuum hood, respectively, forming a pressure difference, improving detection sensitivity and accuracy, and effectively ensuring that the shell quality inspection is completed accurately and efficiently.

[0028] Furthermore, a mounting plate is provided between the bearing plate and the ventilation plate.

[0029] The beneficial effects of this solution are as follows: This technical solution adds a mounting plate between the load-bearing plate and the ventilation plate, which is highly targeted and practical. When dealing with air tightness testing tasks for shells of different models, the mounting plate makes the replacement of the air path sealing unit easy and convenient. Only a quick replacement is required to adapt to the new shell, without the need for large-scale modification and debugging of the equipment, which greatly improves the versatility and flexibility of the equipment. In this way, not only is the idle time of equipment caused by changes in shell models effectively shortened, the detection efficiency is improved, but also the cost investment of enterprises in purchasing a variety of special equipment to meet diversified testing needs is reduced, which effectively promotes automobile manufacturers to optimize production processes and control costs, ensuring that shell air tightness testing can be efficient and accurate in various scenarios.

[0030] Furthermore, the lateral blocking unit includes a No. 1 mounting seat and a No. 2 mounting seat. The No. 1 mounting seat is detachably connected to the mounting plate. A No. 3 driving member is installed on the No. 1 mounting seat, and the No. 3 driving member can drive the No. 2 mounting seat to move to a side close to the positioning seat. A No. 4 driving member is installed on the No. 2 mounting seat. A blocking rod is installed on the output shaft of the No. 4 driving member. A blocking sleeve is provided on the blocking rod, and a No. 5 sealing ring is provided on the sealing sleeve for sealing the side of the vacuum cover. A No. 6 sealing ring for sealing the side of the shell is provided between the sealing sleeve and the head of the blocking rod.

[0031] The beneficial effects of this solution are as follows: when sealing the sides of the shell and the vacuum hood, first start the No. 3 drive, which drives the No. 2 mounting seat to move toward the side of the vacuum hood, driving the sealing sleeve and the sealing rod to move synchronously, and the No. 5 sealing ring on the sealing sleeve seals the side of the vacuum hood. At the same time, the No. 6 sealing ring is inserted into the side hole of the shell along with the sealing rod. Then start the No. 4 drive, and its output shaft contracts to move the sealing rod away from the shell until the head of the sealing rod enters the No. 6 sealing ring to stretch it open, completing the sealing of the side of the shell. The No. 5 sealing ring and the No. 6 sealing ring cooperate with each other to effectively seal the sides of the shell and the vacuum hood, prevent gas leakage from the side, ensure the stability of the negative pressure in the vacuum hood and the high pressure environment in the shell, and thus improve the accuracy of air tightness detection. The special expansion seal design of the No. 6 sealing ring allows the sealing ring to fit tightly against the inner wall of the side hole of the shell under the action of the No. 4 driving part when the head of the sealing rod enters. Even under the impact of high-pressure gas in the shell, it can still be reliably sealed to effectively prevent gas leakage, further enhance the reliability of the side seal of the shell, and effectively ensure the accuracy and stability of the test results.

[0032] Furthermore, a wet detection unit is included, and the wet detection unit is used to detect the leakage position of the shell.

[0033] The beneficial effect of this solution is that in the air tightness test of the automobile air-conditioning compressor housing, the "dry method" test of the sealing test mechanism can preliminarily determine whether the housing is leaking. If the "dry method" detects that the housing leakage exceeds the standard, the wet method detection unit will be activated to accurately locate the leakage position, making up for the deficiency that the "dry method" cannot clearly identify the specific leakage point.

[0034] Based on the results of wet testing, technicians can accurately repair or improve the shell, greatly improve the repair efficiency, and save time and resources for blind inspection. Moreover, on the automobile production line, the marking function of the wet testing unit makes it easier for production personnel to distinguish problematic shells. By statistically analyzing the leakage location, the company can accurately control the weak links, optimize the production process and quality control strategy, promote the overall efficiency and product qualification rate, and help the company develop with high quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a three-dimensional front view of an existing automobile air-conditioning compressor housing; Figure 2 A bottom-up three-dimensional diagram of an existing automobile air-conditioning compressor housing; Figure 3 A three-dimensional diagram of the dry-wet composite leak detector for the shell in Example 1 of the present invention; Figure 4 A three-dimensional diagram of the sealing detection mechanism in Example 1 of the present invention; Figure 5 A three-dimensional diagram of the blocking portion in Example 1 of the present invention; Figure 6 A three-dimensional diagram of the bearing unit and the gas path sealing unit in Example 1 of the present invention; Figure 7 for Figure 6 A partial enlarged view of the middle A; Figure 8 A three-dimensional diagram of the lateral blocking unit in Example 1 of the present invention; Fig. 9 It is a three-dimensional diagram of the sealing detection mechanism and the wet detection unit in Example 1 of the present invention. DETAILED DESCRIPTION

[0036] The following is further described in detail through specific implementation methods: The reference numerals in the drawings of the specification include: housing 1, arc hole 2, connecting hole 3, circular hole 4, blind hole 5, chassis 6, No. 1 switch door 7, safety grating 8, top plate 9, bearing plate 10, support column 11, No. 1 driving member 12, connecting plate 13, push plate 14, connecting column 15, connecting rod 16, No. 1 connecting plate 17, No. 2 connecting plate 18, blocking plate 19, No. 2 sealing ring 20, No. 1 guide sleeve 21, vacuum cover 22, No. 2 driving member 23, lifting plate 24, driving plate 25, guide rod 26, No. 2 guide sleeve 27, guide plate 28, No. 1 guide column 29, No. 3 guide sleeve 30, guide hole 31, ventilation plate 32, positioning seat 33, rubber ring 34, No. 3 sealing ring 35, No. 4 sealing ring 36, No. 1 air inlet 37, No. 2 air inlet 38, No. 1 exhaust hole 39, No. 2 exhaust hole 40, No. 1 positioning column 41, No. 2 positioning column 42, guide bar 43, No. 2 guide column 44, mounting plate 45, L-shaped positioning bar 46, No. 1 mounting seat 47, No. 2 mounting seat 48, No. 3 driving member 49, No. 4 driving member 50, "I"-shaped push rod 51, slider 52, slide rail 53, blocking rod 54, fixed section 55, blocking section 56, limit section 57, connecting section 58, No. 5 sealing ring 59, No. 6 sealing ring 60, No. 2 switch door 61, No. 5 driving member 62, water tank 63, sliding plate 64, No. 4 guide sleeve 65, slide rod 66, sight glass 67.

[0037] Example 1 like Figure 1As shown, the existing automobile air-conditioning compressor housing 1 is a cylindrical structure with the bottom and the top connected. Six arc-shaped holes 2 are opened on the upper side of the housing 1 and penetrate to the bottom. Each arc-shaped hole 2 is provided with a partition bar, thereby dividing the arc-shaped hole 2 at the bottom of the housing 1 into two parts. A total of 12 arc-shaped holes 2 are formed at the bottom of the housing 1. The partition bar is integrally formed with the housing 1. A connecting hole 3 is opened on the left side of the housing 1, and the connecting hole 3 is connected to one of the arc-shaped holes 2. Figure 2 As shown, the front side of the housing 1 is provided with two symmetrically distributed circular holes 4 and two symmetrically distributed blind holes 5 .

[0038] like Figure 3 The shell dry-wet composite leak detector shown includes a chassis 6, a wet detection unit and a sealing detection mechanism.

[0039] like Figure 3 As shown, a sealing detection mechanism installation area is provided on the upper left side of the chassis 6, and a No. 1 switch door 7 is hinged on the chassis 6 on the left side and the rear side of the sealing detection mechanism. This technology provides convenient conditions for the maintenance and repair of the sealing detection mechanism. The chassis 6 on the front side of the sealing detection mechanism adopts an open structure, and safety gratings 8 are installed on the left and right sides of the front side of the chassis 6. The setting of the safety grating 8 can effectively avoid accidental contact incidents when personnel approach the working area of ​​the chassis 6, and effectively prevent the occurrence of mechanical injuries such as pinching, thereby effectively ensuring the personal safety of personnel.

[0040] like Figure 4 As shown, the sealing detection mechanism includes a bearing unit, a top sealing unit, a vacuum lifting unit and an air path sealing unit.

[0041] like Figure 3-4 As shown, the bearing unit includes a top plate 9 and a bearing plate 10. The top plate 9 is firmly connected to the top of the inside of the chassis 6 by bolts. Support columns 11 are installed at the four corners of the bottom of the top plate 9 by bolts, and the lower end of each support column 11 is fixed to the bearing plate 10 by welding, thereby constructing a stable and reliable bearing structure.

[0042] like Figure 3-5As shown, the top blocking unit is mounted on the bearing unit in a sliding manner, and its main function is to effectively seal the top of the housing 1 placed in the vacuum cover 22 and the top of the vacuum cover 22. Specifically, the top blocking unit includes a No. 1 driving member 12, a connecting plate 13 and a push plate 14. A mounting hole is provided on the top of the chassis 6, and the No. 1 driving member 12 is mounted on the top of the top plate 9. Its output shaft passes through the top plate 9 and is fixed to the connecting plate 13 by bolt connection. The four corner positions at the bottom of the connecting plate 13 are all bolted with connecting columns 15, and the lower ends of each connecting column 15 are welded to the upper side of the push plate 14. A blocking portion is provided at the bottom of the push plate 14, and the blocking portion includes a connecting rod 16 and a blocking disk 19. The upper end of the connecting rod 16 is integrally formed with a No. 1 connecting disk 17, and the lower end of the connecting rod 16 is integrally formed with a No. 2 connecting disk 18. The No. 1 connecting disk 17 is connected to the bottom of the push plate 14 by bolts, and the No. 2 connecting disk 18 is connected to the top of the blocking disk 19 by bolts. Furthermore, in order to improve the installation efficiency and installation accuracy of the plugging part, a No. 1 positioning groove is provided at the bottom of the push plate 14, the upper end of the connecting rod 16 extends to the top of the No. 1 connecting disk 17, and a No. 2 positioning groove is provided at the top of the plugging disk 19, and the lower end of the connecting rod 16 extends to the bottom of the No. 2 connecting disk 18. With such a design, the upper end of the connecting rod 16 cooperates with the No. 1 positioning groove to accurately and quickly determine the installation position of the No. 1 connecting disk 17 at the bottom of the push plate 14; the lower end of the connecting rod 16 cooperates with the No. 2 positioning groove to accurately and quickly determine the installation position of the No. 2 connecting disk 17 at the top of the plugging disk 19. A No. 1 sealing ring is glued to the bottom of the plugging disk 19, and the No. 1 sealing ring is used to seal the top of the shell 1, and the sealing position is on the shell 1 outside the arc hole 2, so as to construct a closed space inside the shell 1 and inside the arc hole 2; a No. 2 sealing ring 20 is glued to the top of the plugging disk 19, and the No. 2 sealing ring 20 is used to seal the top inside the vacuum cover 22. The push plate 14 is slidably set on the support column 11. Specifically, the four corner positions of the upper side of the push plate 14 are all equipped with a No. 1 guide sleeve 21 running through the bottom thereof by bolts. The No. 1 guide sleeve 21 is slidably matched with the support column 11. With the help of the No. 1 driving member 12, the push plate 14 can be driven to slide on the support column 11, thereby accurately pressing the sealing disk 19 on the top of the shell 1.

[0043] like Figure 4As shown, the vacuum lifting unit is slidably arranged on the top sealing unit, and includes a vacuum cover 22 and a lifting part. The lifting part can drive the vacuum cover 22 to perform lifting movements, so that the vacuum cover 22 can be covered on the outside of the shell 1, and a differential pressure sensor is installed between the vacuum cover 22 and the shell 1. Specifically, the lifting part includes a No. 2 driving member 23 and a lifting plate 24. The No. 2 driving member 23 is installed on the top of the push plate 14 by bolts. A driving plate 25 is installed on the output shaft of the No. 2 driving member 23 by bolts. Guide rods 26 are welded at the four corner positions of the bottom of the driving plate 25. Four No. 2 guide sleeves 27 are installed on the upper side of the push plate 14 by bolts. The No. 2 guide sleeve 27 is connected with the bottom of the push plate 14. The guide rods 26 correspond to the No. 2 guide sleeves 27 one by one. The guide rods 26 pass through the No. 2 guide sleeves 27 and are welded to the upper side of the lifting plate 24. The vacuum cover 22 is installed at the bottom of the lifting plate 24 by bolts. The vacuum cover 22 is driven down by the No. 2 driving member 23, and the vacuum cover 22 is placed on the shell 1, and it is ensured that the top of the vacuum cover 22 is tightly fitted with the No. 2 sealing ring 20 to achieve effective sealing of the top of the vacuum cover 22.

[0044] Furthermore, in order to enhance the stability of the lifting part, a guide unit is provided between the lifting plate 24 and the vacuum cover 22, and the vacuum cover 22 is mounted on the guide unit. Figure 4 As shown, the guide unit includes a guide plate 28 and four No. 1 guide columns 29. The guide plate 28 is connected to the bottom of the lifting plate 24 by bolts. The vacuum cover 22 is installed at the bottom of the guide plate 28 by bolts. The lifting plate 24 and the guide plate 28 are provided with through holes for the plugging part to pass through. The lower end of the No. 1 guide column 29 is installed on the gas path sealing unit. Four No. 3 guide sleeves 30 are installed at the four corners of the bottom of the guide plate 28 by bolts. The No. 3 guide sleeves 30 are connected to the top of the guide plate 28. Four guide holes 31 are provided on the push plate 14. The No. 1 guide column 29 is slidably arranged in the No. 3 guide sleeves 30 and the guide holes 31.

[0045] like Figure 4 As shown, the air path sealing unit is arranged on the top of the supporting plate 10, which can locate the placement position of the shell 1 and effectively seal the bottom of the shell 1 and the bottom of the vacuum cover 22, and the air path sealing unit is provided with an air intake channel communicating with the interior of the shell 1 and an air exhaust channel communicating with the interior of the vacuum cover 22.

[0046] like Figure 6-7As shown, the gas path sealing unit includes a vent plate 32, which is installed on the top of the bearing plate 10 by bolts. A positioning seat 33 for positioning the housing 1 is installed on the top of the bearing plate 10 by bolts. A No. 7 sealing ring is arranged between the positioning seat 33 and the vent plate 32. The No. 7 sealing ring can seal the bottom of the positioning seat 33. When the housing 1 is ventilated, the gas is effectively prevented from leaking from the bottom of the positioning seat 33 to the vacuum cover 22. A rubber ring 34 is glued to the side of the positioning seat 33. When the housing 1 is placed, the rubber ring 34 can prevent the positioning seat 33 from scratching the inner wall of the housing 1. The upper side of the vent plate 32 is provided with a concentric No. 1 annular groove and a No. 2 annular groove. Both the No. 1 annular groove and the No. 2 annular groove are concentrically arranged with the positioning seat 33. A No. 3 sealing ring 35 is glued in the No. 1 annular groove for sealing the bottom of the housing 1. The sealing position is on the housing 1 outside the arc hole 2. A No. 4 sealing ring 36 is glued in the No. 2 annular groove to seal the bottom of the vacuum cover 22; a No. 1 air inlet hole 37 is opened on the top of the positioning seat 33, and a No. 2 air inlet hole 38 is opened on the right side of the ventilation plate 32. The No. 1 air inlet hole 37 is connected with the No. 2 air inlet hole 38 to form an air inlet channel for introducing high-pressure gas into the shell 1. A No. 1 exhaust hole 39 is opened on the ventilation plate 32 between the No. 3 sealing ring 35 and the No. 4 sealing ring 36, and a No. 2 exhaust hole 40 is opened on the right side of the ventilation plate 32. The No. 1 exhaust hole 39 is connected with the No. 2 exhaust hole 40 to form an exhaust channel for extracting air from the vacuum cover 22 and creating a negative pressure environment in the vacuum cover 22. A No. 1 positioning column 41 is installed on the left and right sides of the upper side of the ventilation plate 32 by bolts, and the No. 1 positioning column 41 corresponds to the circular hole 4 at the bottom of the shell 1. The front and rear sides of the upper side of the vent plate 32 are both bolted with No. 2 positioning columns 42, which correspond to the blind holes 5 at the bottom of the housing 1. A guide bar 43 is bolted to the upper side of the vent plate 32, and two No. 2 guide columns 44 are bolted to the vent plate 32 on the opposite side of the guide bar 43, and the guide bar 43 and the No. 2 guide column 44 are used to guide the vacuum cover 22.

[0047] Furthermore, in order to facilitate the replacement of the air path sealing unit to adapt to the detection requirements of different types of shells, the air path sealing unit also includes a mounting plate 45, and L-shaped positioning strips 46 are installed on the left and right sides of the upper side of the supporting plate 10 by bolts. The mounting plate 45 is installed on the supporting plate 10 between the two L-shaped positioning strips 46 by bolts, and the ventilation plate 32 is installed on the mounting plate 45 by bolts. The lower end of the No. 1 guide column 29 is installed on the mounting plate 45 by bolts. By arranging the L-shaped positioning strip 46 on the supporting plate 10, the mounting plate 45 can be positioned to improve the installation efficiency.

[0048] like Figure 6As shown, the gas path sealing unit is also provided with a lateral blocking unit, which is located on the mounting plate 45 at the rear side of the positioning seat 33 and is used to seal the side of the housing 1 and the side of the vacuum cover 22. Specifically, as Figure 8 As shown, the lateral blocking unit includes a No. 1 mounting seat 47, a No. 2 mounting seat 48, a No. 3 driving member 49 and a No. 4 driving member 50. The No. 1 mounting seat 47 is mounted on the plate 45 by bolts, and the No. 3 driving member 49 is mounted on the left side of the No. 1 mounting seat 47 by bolts. The output shaft of the No. 3 driving member 49 passes through the left side of the No. 1 mounting seat 47, and an "I"-shaped push rod 51 is installed on its output shaft by bolts. The "I"-shaped push rod 51 is clamped on the left side of the No. 2 mounting block, and the No. 2 mounting seat 48 is set on the No. 1 mounting seat 47 in a sliding manner. The front and rear side surfaces of the No. 2 mounting seat 48 are both installed with sliders 52 by bolts, and the front and rear side surfaces of the inner side surface of the No. 1 mounting seat 47 are both installed with slide rails 53 by bolts. The slider 52 is slidably matched with the slide rail 53, and the No. 2 mounting seat 48 is driven to move by the No. 3 driving member 49. The fourth driving member 50 is installed inside the No. 2 mounting seat 48 by bolts, and the output shaft of the fourth driving member 50 passes through the right side of the No. 2 mounting seat 48, and a blocking rod 54 is installed on its output shaft by bolts, and a blocking sleeve is sleeved on the blocking rod 54, and the blocking sleeve includes a fixed section 55, a blocking section 56, a limiting section 57 and a connecting section 58 which are connected in sequence, and the fixed section 55, the blocking section 56, the limiting section 57 and the connecting section 58 are integrally formed, and the fixed section 55 is connected to the right side of the No. 2 mounting seat 48 by bolts, and a No. 5 sealing ring 59 is glued to the right side of the sealing section 56, and the No. 5 sealing ring 59 is used to seal the side of the vacuum cover 22. A No. 6 sealing ring 60 is sleeved on the blocking rod 54 between the connecting section 58 and the head of the blocking rod 54. The output shaft of the No. 4 driving member 50 contracts, which can drive the blocking rod 54 to move to the side away from the shell 1, so that the head of the blocking rod 54 moves to the inside of the No. 6 sealing ring 60, and the No. 6 sealing ring 60 is stretched open, so as to seal the connecting hole 3 on the shell 1.

[0049] like Fig. 9 As shown, the wet detection unit is arranged below the sealing detection mechanism to detect the leakage position of the housing 1. Figure 3 As shown, a wet detection unit installation area is provided in the chassis 6 below the sealing detection mechanism, and a second switch door 61 is hinged on the chassis 6 on the front side of the wet detection unit to facilitate maintenance and repair of the leak detection unit.

[0050] like Fig. 9As shown, the wet detection unit includes a No. 5 drive 62 and a water tank 63. The water tank 63 is a box structure with an opening at the top. The water tank 63 is vertically slidably arranged in the chassis 6. The No. 5 drive 62 can drive the water tank 63 to rise and fall. Specifically, a sliding plate 64 is welded at the bottom of the water tank 63. Four guide sleeves 65 are installed at the four corners of the top of the sliding plate 64 by bolts. The lower end of the No. 4 guide sleeve 65 passes through the bottom of the sliding plate 64 and is located below the sliding plate 64. Four slide bars 66 are installed on the chassis 6 below the sliding plate 64 by bolts. The upper end of each slide bar 66 passes through the No. 4 guide sleeve 65 and is welded to the chassis 6 above the sliding plate 64. The No. 5 drive 62 is installed on the chassis 6 below the sliding plate 64 by bolts. The output shaft of the No. 5 drive 62 is installed at the bottom of the sliding plate 64 by bolts. A sight glass 67 is installed on the front side of the water tank 63. The sight glass 67 is convenient for observing the leakage position of the housing 1. In this embodiment, the first driving member 12, the second driving member 23, the third driving member 49, the fourth driving member 50 and the fifth driving member 62 are all cylinders.

[0051] The specific implementation process is as follows: The detection of the airtightness of the housing 1 includes the following steps: (1) Placing the housing 1: placing the housing 1 on the ventilation plate 32, and using the positioning seat 33, the first positioning column 41 and the second positioning column 42 to accurately position the housing 1; (2) Seal the upper and lower ends of the shell 1: After the shell 1 is placed in place, start the No. 1 driving member 12, which drives the push plate 14 to slide downward along the support column 11, thereby driving the sealing disk 19 to move synchronously, and press the sealing disk 19 tightly against the top of the shell 1. The top of the shell 1 is sealed by the No. 1 sealing ring, and the bottom of the shell 1 is sealed by the No. 3 sealing ring 35, thereby achieving effective sealing at the upper and lower ends of the shell 1.

[0052] (3) Covering the vacuum cover 22 and sealing the upper and lower ends of the vacuum cover 22: Start the No. 2 driving member 23, the output shaft of the No. 2 driving member 23 contracts, driving the guide plate 28 to move downward along the No. 1 guide column 29, and then driving the vacuum cover 22 to move synchronously, and the vacuum cover 22 is covered outside the shell 1. At this time, the top of the inner part of the vacuum cover 22 is tightly fitted with the top of the blocking disk 19, the top of the vacuum cover 22 is sealed by the No. 2 sealing ring 20, and the bottom of the vacuum cover 22 is sealed by the No. 4 sealing ring 36, ensuring the sealing of the upper and lower ends of the vacuum cover 22; (4) Blocking the side of the shell 1 and the vacuum cover 22: Start the No. 3 drive member 49, which drives the No. 2 mounting seat 48 to move toward the side close to the vacuum cover 22, thereby driving the blocking sleeve and the blocking rod 54 to move synchronously, and sealing the side of the vacuum cover 22 through the No. 5 sealing ring 59 on the blocking sleeve. At this time, the No. 6 sealing ring 60 and the blocking rod 54 are inserted into the connecting hole 3, and the No. 4 drive member 50 is started. The output shaft of the No. 4 drive member 50 contracts, driving the blocking rod 54 to move toward the side away from the shell 1, so that the head of the blocking rod 54 moves into the No. 6 sealing ring 60, and the No. 6 sealing ring 60 is stretched open to block the connecting hole 3 on the shell 1, thereby constructing an independent enclosed space inside the shell 1, and also forming a closed area between the shell 1 and the vacuum cover 22.

[0053] (5) Leakage performance detection: With the help of an inflation device, high-pressure gas is filled into the shell 1 through the air inlet channel; at the same time, with the help of an exhaust device, the gas in the vacuum cover 22 is extracted through the exhaust channel, thereby creating a negative pressure state in the vacuum cover 22. After the inflation and exhaust processes are completed, the pressure changes in the vacuum cover 22 and the shell 1 are monitored in real time by means of a differential pressure sensor, and it is determined based on the monitoring data whether the leakage of the shell 1 exceeds the specified standard, so as to accurately determine whether the air tightness of the shell 1 is qualified.

[0054] The above is a process of installing the housing 1 on the sealing detection mechanism and performing the detection, while the process of removing the housing 1 from the sealing detection mechanism is opposite to it, which will not be repeated here.

[0055] If the leakage of the housing 1 exceeds the specified standard, the wet detection unit is used to detect the leakage position of the housing 1. The specific detection process is as follows: (1) Release the constraint of the lateral blocking unit on the shell 1 and the vacuum cover 22: Start the No. 4 driving member 50, the output shaft of the No. 4 driving member 50 extends, driving the blocking rod 54 to move toward the side close to the shell 1, so that the head of the blocking rod 54 extends out of the No. 6 sealing ring 60; then start the No. 3 driving member 49, the No. 3 driving member 49 drives the No. 2 mounting seat 48 to move toward the side away from the vacuum cover 22, thereby releasing the constraint of the blocking sleeve and the blocking rod 54 on the shell 1 and the vacuum cover 22; (2) Removing the vacuum cover 22: Start the second driving member 23, the output shaft of the second driving member 23 extends, driving the guide plate 28 to move upward along the first guide column 29, thereby driving the vacuum cover 22 to move synchronously, so that the vacuum cover 22 is away from the housing 1; (3) Using the lateral blocking unit to block the connection hole 3 on the side of the shell 1: Start the No. 3 driving member 49, the No. 3 driving member 49 drives the No. 2 mounting seat 48 to move toward the side close to the shell 1, thereby driving the blocking sleeve and the blocking rod 54 to move synchronously, and the No. 6 sealing ring 60 and the blocking rod 54 are inserted into the connection hole 3, and start the No. 4 driving member 50, the output shaft of the No. 4 driving member 50 contracts, driving the blocking rod 54 to move toward the side away from the shell 1, so that the head of the blocking rod 54 moves into the No. 6 sealing ring 60, the No. 6 sealing ring 60 is opened, and the connection hole 3 on the shell 1 is blocked, thereby constructing an independent closed space inside the shell 1; (4) Detecting the leakage position of the shell 1: Start the fifth drive member 62, the output shaft of the fifth drive member 62 extends, driving the water tank 63 to rise synchronously, immerse the shell 1 in the water in the water tank 63, and observe the leakage position of the shell 1 through the sight glass 67.

[0056] Through the coordinated operation of the various units of this housing dry-wet composite leak detector, the air tightness detection and leakage position detection of the automobile air-conditioning compressor housing 1 can be completed efficiently and accurately, effectively ensuring product quality, improving detection efficiency and accuracy, and providing solid and strong support for the stable operation of the automobile air-conditioning system.

[0057] Example 2 On the basis of Example 1, a control unit is further included, the control unit includes a controller and a buzzer, a pressure sensor is provided in the fourth drive member 50, and the pressure sensor and the buzzer are electrically connected to the controller. In this embodiment, the controller uses a single chip microcomputer of model STC89C51, and the pressure sensor model is MPXV7002.

[0058] When the lateral blocking unit is used to block the connection hole 3 on the side of the vacuum cover 22 and the shell 1, the third drive 49 and the fourth drive 50 are started at the same time. The third drive 49 drives the second mounting seat 48 to move to the side close to the vacuum cover 22, thereby driving the blocking sleeve and the blocking rod 54 to move synchronously. At the same time, the output shaft of the fourth drive 50 is extended, driving the blocking rod 54 to move to the side close to the shell 1. When the actual position of the connection hole 3 deviates from the theoretical position, the head of the blocking rod 54 will touch the side wall of the connection hole 3. At this time, the pressure sensor located in the fourth drive 50 will immediately detect the pressure change and quickly feed back the pressure information to the controller. After receiving the pressure change information, the controller will immediately control the buzzer to send an alarm signal to clearly remind the operator that the position of the connection hole 3 has deviated, and then determine that the shell 1 is unqualified. When there is no deviation between the actual position of the connecting hole 3 and the theoretical position, the No. 5 sealing ring 59 on the sealing sleeve will seal the side of the vacuum cover 22, and the No. 6 sealing ring 60 and the sealing rod 54 will be inserted into the connecting hole 3. Through the contraction of the output shaft of the No. 4 driving member 50, the sealing rod 54 will be driven to move to the side away from the shell 1, so that the head of the sealing rod 54 will move into the No. 6 sealing ring 60, expand the No. 6 sealing ring 60, and seal the connecting hole 3 on the shell 1.

[0059] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Shell dry and wet composite leak detector, characterized by: It includes a sealing detection mechanism, which includes a bearing unit; a top sealing unit is slidably arranged on the bearing unit, a vacuum lifting unit is slidably arranged on the top sealing unit, the vacuum lifting unit includes a vacuum cover and a lifting part, the lifting part can drive the vacuum cover to rise and fall, and the top sealing unit is used to seal the top of the shell and the top of the vacuum cover; an air path sealing unit is arranged below the top sealing unit, the air path sealing unit is used to seal the bottom of the shell and the bottom of the vacuum cover, and the air path sealing unit is provided with an air inlet channel communicating with the interior of the shell and an air exhaust channel communicating with the interior of the vacuum cover; the air path sealing unit is also provided with a lateral sealing unit, which is used to seal the side of the shell and the side of the vacuum cover, and a differential pressure sensor is installed between the vacuum cover and the shell.

2. The dry-wet compound leak detector for housing according to claim 1, characterized in that: The bearing unit comprises a top plate, a bearing plate and a plurality of supporting columns, and the top plate and the bearing plate are connected through the supporting columns.

3. The dry-wet composite leak detector for housing according to claim 2, characterized in that: The top sealing unit includes a No. 1 driving member, a connecting plate, a push plate and a plurality of connecting columns. The No. 1 driving member is installed on the top of the top plate, and its output shaft passes through the top plate and is detachably connected to the connecting plate. The connecting plate and the push plate are fixedly connected by connecting columns. The push plate is slidably arranged on the supporting columns. The push plate is provided with a sealing portion on the side close to the supporting plate, and the sealing portion can seal the top of the shell placed in the vacuum cover and the top of the vacuum cover.

4. The dry-wet compound leak detector for housing according to claim 3, characterized in that: The sealing part includes a connecting rod and a sealing disk, one end of the connecting rod is fixedly connected to a connecting disk No. 1, and the other end is fixedly connected to a connecting disk No.

2. The connecting disk No. 1 is detachably connected to the side of the push plate close to the bearing plate, and the connecting disk No. 2 is detachably connected to the sealing disk. A No. 1 sealing ring is provided on the side of the sealing disk close to the bearing plate, and a No. 2 sealing ring is provided on the side of the sealing disk away from the bearing plate.

5. The dry-wet compound leak detector for housing according to claim 4, characterized in that: The lifting part includes a No. 2 driving member and a lifting plate. The No. 2 driving member is installed on the top of the push plate. The driving plate is detachably connected to the output shaft of the No. 2 driving member. A plurality of guide rods are fixedly connected to the side of the driving plate close to the supporting plate. The guide rods pass through the push plate and are fixedly connected to the top of the lifting plate. The vacuum cover is detachably connected to the side of the lifting plate close to the supporting plate.

6. The dry-wet compound leak detector for housing according to claim 5, characterized in that: A guide unit is arranged between the lifting plate and the vacuum cover, and the vacuum cover is mounted on the guide unit.

7. The dry-wet compound leak detector for housing according to claim 6, characterized in that: The air path sealing unit includes a ventilation plate, which is detachably connected to the supporting plate, and a positioning seat is sealed on the ventilation plate. A No. 3 sealing ring and a No. 4 sealing ring are provided on the ventilation plate, and the No. 3 sealing ring and the No. 4 sealing ring are concentrically arranged with the positioning seat, and a No. 1 air inlet hole is provided on the positioning seat, and a No. 2 air inlet hole is provided on the side of the ventilation plate, and the No. 1 air inlet hole is connected with the No. 2 air inlet hole to form an air inlet channel, and a No. 1 exhaust hole is provided on the ventilation plate between the No. 3 sealing ring and the No. 4 sealing ring, and a No. 2 exhaust hole is provided on the side of the ventilation plate, and the No. 1 exhaust hole is connected with the No. 2 exhaust hole to form an exhaust channel.

8. The dry-wet compound leak detector for housing according to claim 7, characterized in that: A mounting plate is arranged between the bearing plate and the ventilation plate.

9. The dry-wet compound leak detector for housing according to claim 8, characterized in that: The lateral blocking unit includes a No. 1 mounting seat and a No. 2 mounting seat. The No. 1 mounting seat is detachably connected to the mounting plate. A No. 3 driving member is installed on the No. 1 mounting seat, and the No. 3 driving member can drive the No. 2 mounting seat to move to the side close to the positioning seat. A No. 4 driving member is installed on the No. 2 mounting seat. A blocking rod is installed on the output shaft of the No. 4 driving member. A blocking sleeve is provided on the blocking rod, and a No. 5 sealing ring is provided on the sealing sleeve for sealing the side of the vacuum cover. A No. 6 sealing ring for sealing the side of the shell is provided between the sealing sleeve and the head of the blocking rod.

10. The dry-wet compound leak detector for housing according to claim 9, characterized in that: The invention also comprises a wet method detection unit, which is used for detecting the leakage position of the shell.

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