A domestic coffee machine pressure sensor structure
By employing a dual-sealing and cooling system, the design solves the problems of sealing and detection accuracy of pressure sensors in home coffee machines under high temperature and vibration environments, extending the sensor's lifespan and improving detection accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUXI SENCOCH SEMICON CO LTD
- Filing Date
- 2025-12-10
- Publication Date
- 2026-08-04
AI Technical Summary
Existing pressure sensors for home coffee machines cannot adapt to high-temperature working environments, water corrosion, and water pump vibration, resulting in problems such as insufficient sealing performance, water leakage, impurity infiltration, detection accuracy deviation, and shortened lifespan.
The sensor employs a dual-sealing structure, protective devices, and cooling devices, including a sealing design for the sealing ring and gasket, a limiting structure for the collar and O-ring, and a cooling circulation system for the vortex guide frame, to ensure the sensor's sealing performance, stability, and heat dissipation.
It significantly reduces the risk of water leakage and impurity infiltration, improves detection accuracy and sensor lifespan, and ensures stable operation of the sensor in high-temperature environments.
Smart Images
Figure CN121595100B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of pressure sensor technology, specifically to a pressure sensor structure for a home coffee machine. Background Technology
[0002] A pressure sensor is an electronic component that accurately detects the pressure of a gas or liquid and converts the pressure signal into a readable electrical signal. It is widely used in industries such as manufacturing, medicine, automotive, and consumer electronics. Its core consists of a sensing element and a signal conversion circuit. During operation, pressure causes deformation or changes in the physical properties of the sensing element, which are then converted into a standard electrical signal by the conversion circuit, enabling quantitative pressure monitoring. In practical applications, it is used for industrial pipeline pressure monitoring, hydraulic system pressure feedback, automotive tire pressure monitoring, medical blood pressure monitor pressure measurement, and differential pressure detection of household appliance filters. It is a key component for achieving accurate pressure parameter sensing and automated control in various industries, providing data support for safe system operation and efficiency optimization.
[0003] Pressure sensors in home coffee machines are core components that ensure coffee quality and equipment safety. They often employ piezoresistive MEMS chip technology, where pressure causes deformation of the sensitive element, resulting in a change in resistance, which is then converted into an electrical signal. Their core function is to control extraction pressure, installed at the water pump or brewing head, stabilizing the pressure within the golden range of 9-11 bar to prevent under- or over-extraction from affecting the taste. High-end models can even connect to an app to visualize the pressure curve; or monitor steam pressure to ensure the fineness of milk foam, and link the system to overpressure warnings and automatic pressure relief to protect the equipment.
[0004] Existing pressure sensors for home coffee machines suffer from structural design flaws, making them unsuitable for the complex usage scenarios of coffee machines, including "high-temperature operating environment, water circuit corrosion, and water pump vibration." These sensors suffer from insufficient sealing performance leading to water circuit leakage and impurity infiltration; direct contact between the sensor's sensitive element and the water circuit causes scaling and corrosion, shortening its lifespan; and are also affected by temperature drift due to high-temperature conduction and assembly displacement caused by vibration. Ultimately, this results in pressure detection accuracy deviations exceeding 15%, a lifespan shortened to less than one year, and poor long-term operational stability, failing to meet the core requirements of home coffee machines for precise control of extraction pressure and safe operation. Therefore, we propose a new pressure sensor structure for home coffee machines. Summary of the Invention
[0005] To address the shortcomings of existing technologies, this invention provides a pressure sensor structure for home coffee machines, solving the problem that existing pressure sensors cannot adapt to the complex usage scenarios of coffee machines, such as "high-temperature working environment, water medium erosion, and water pump vibration." These problems include insufficient sealing performance leading to water leakage and impurity infiltration, as well as scaling and corrosion caused by direct contact between the sensor's sensitive element and the water system, resulting in a shortened lifespan.
[0006] To achieve the above objectives, the present invention provides the following technical solution: a pressure sensor structure for a household coffee machine, comprising a housing, a cable, and a sensor body. The cable is fixedly connected to the lower surface of the housing, and the sensor body is mounted on the inner wall of the housing. An assembly device is provided on the upper surface of the housing, the assembly device comprising a pressing plate, the pressing plate being threadedly connected to the inner wall of the housing, a guide cavity being formed on the surface of the pressing plate, the guide cavity communicating with a detection hole of the sensor body, a protective cover being threadedly connected to the surface of the housing, an isolation sleeve being fixedly connected to the inner wall of the protective cover, a guide tube being fixedly connected to the inner wall of the isolation sleeve, the guide tube being movably abutting against the upper surface of the pressing plate, and a threaded connector being fixedly connected to the upper surface of the guide tube.
[0007] Preferably, a sealing ring is fixedly connected to the inner wall of the guide cavity, and the sealing ring abuts against the upper surface of the sensor body. An assembly groove is formed on the lower surface of the pressing plate, and a gasket is fixedly connected to the inner wall of the pressing plate within the assembly groove, abutting against the upper surface of the sensor body. Relying on the abutting structure between the sealing ring and the upper surface of the sensor body, a seal can be formed first between the inner wall of the guide cavity and the contact area of the sensor. Simultaneously, the pressing plate abuts against the upper surface of the sensor body through the gasket in the assembly groove, further enhancing the sealing effect between the pressing plate and the sensor. This dual-sealing design significantly reduces the probability of leakage of the medium inside the guide cavity.
[0008] Preferably, a collar is fixedly connected to the inner wall of the protective cover, the collar is inserted into the inner wall of the outer shell, and the collar is movably abutted against the upper surface of the pressing plate. A rubber ring is fixedly connected to the inner wall of the protective cover, the rubber ring abuts against the upper surface of the outer shell, and the rubber ring is sleeved on the outer arc surface of the collar. An annular groove is formed on the lower surface of the guide tube, and an O-ring is fixedly connected to the inner wall of the guide tube in the annular groove. The O-ring abuts against the upper surface of the pressing plate. Relying on the structure of the collar fixed to the inner wall of the protective cover, its outer arc surface can restrict the position of the sleeved rubber ring to ensure accurate sealing position. At the same time, the design of the collar being inserted into the inner wall of the outer shell can supplement the shielding structure of the assembly part of the protective cover and the outer shell, and the movable abutment of the collar against the upper surface of the pressing plate can enhance the overall assembly stability. Finally, with the tight abutment of the rubber ring against the upper surface of the outer shell, the sealing strength of the contact part between the protective cover and the outer shell is effectively improved.
[0009] Preferably, the inner wall of the guide cavity is filled with a filling liquid, the inlet of the guide cavity is funnel-shaped, and the diameter of the guide section of the guide cavity is equal to the diameter of the detection hole of the sensor body. The structure of the guide cavity provides a structural guarantee for the precise correspondence between the filling liquid and the detection hole. In addition, the funnel-shaped inlet design facilitates efficient filling of the filling liquid and avoids stagnation. With the cooperation of the dual structures, the pressure generated when the filling liquid is squeezed can be transmitted to the sensor body without deviation, ensuring the accuracy of detection.
[0010] Preferably, the upper surface of the pressing plate is provided with a protective device, which includes a positioning frame, fixedly connected to the upper surface of the pressing plate, a limiting frame fixedly connected to the inner wall of the positioning frame, and an assembly frame threadedly connected to the inner wall of the positioning frame. The upper surface of the assembly frame has a groove, and a fixing ring is installed on the inner wall of the groove. A rubber film is fixedly connected to the inner wall of the fixing ring. A pressure ring is installed on the upper surface of the assembly frame, and a circular hole is opened on the upper surface of the pressure ring. A locking bolt is inserted into the inner wall of the circular hole of the pressure ring, and the locking bolt is threadedly connected to the inner wall of the assembly frame. Based on the fixed foundation of the positioning frame and the pressing plate, the limiting frame fixed to its inner wall can provide auxiliary positioning for the assembly frame threadedly connected to the positioning frame. Together with the threaded connection, this constitutes a "positioning-locking" dual fixing structure. On the one hand, it ensures that the assembly frame is accurately installed to the preset position; on the other hand, it significantly enhances its stability and firmness during use, thereby reducing the probability of media seeping into the interior of the assembly frame.
[0011] Preferably, the limiting frame and the inner wall of the assembly frame are threaded together, and the cavity formed by the limiting frame and the assembly frame is filled with filling liquid. The pressure ring abuts against the upper surface of the fixing ring. Relying on the connection between the pressure ring and the assembly frame, the pressure ring can tightly abut against the upper surface of the fixing ring, forming a rigid limit on the fixing ring, ensuring that the rubber film of the fixing ring and the inner wall is accurately fixed in the preset position of the assembly frame. This fixing structure allows the rubber film to undergo compliant deformation when squeezed by the medium, and can stably transmit the pressure to the filling liquid in the cavity of the limiting frame and the assembly frame, ensuring the continuity and accuracy of pressure transmission.
[0012] Preferably, the surface of the isolation sleeve is provided with a cooling device, which includes a vortex guide frame. The vortex guide frame is fixedly connected to the lower surface of the isolation sleeve and inserted into the inner wall of the pressing plate. A flow cavity is formed on the arc surface of the isolation sleeve. A connector is fixedly connected to the inner wall of the outer shell. Discharge cavities are formed on the surfaces of both the isolation sleeve and the guide tube. A connecting frame is fixedly connected to the inner wall of the outer shell, and a connector is fixedly connected to the inner wall of the connecting frame. Relying on the fixed connection between the vortex guide frame and the lower surface of the isolation sleeve, and its insertion into the inner wall of the pressing plate, the cooling medium flowing in from the flow cavity on the arc surface of the isolation sleeve can be precisely guided. The vortex structure can extend the flow path of the medium inside the pressing plate, thereby increasing the contact time between the medium and the pressing plate. During this process, the medium can fully absorb the heat on the pressing plate and finally discharge it through the discharge cavities on the surfaces of the isolation sleeve and the guide tube, effectively improving the heat exchange efficiency, thereby reducing the conduction of heat to the sensor body and reducing the thermal impact on the sensor body.
[0013] Preferably, a blocking part is fixedly connected to the surface of the vortex guide frame, and the blocking part abuts against the inner wall of the pressing plate. A shielding part is fixedly connected to the inner side of the vortex guide frame, and the shielding part is fixedly connected to the lower surface of the guide tube and inserted into the inner wall of the pressing plate. Relying on the shielding part fixed to the inner side of the vortex guide frame, a structural blockage can be formed at the end of the vortex guide frame near the discharge chamber, cutting off the subsequent space in the extension direction of the vortex guide frame. Together with the sealing of the blocking part on the surface of the vortex guide frame and the abutment seal of the inner wall of the pressing plate, the flow direction of the medium in the vortex path is limited, ensuring that the cooling medium entering the vortex guide frame from the flow chamber flows along the preset trajectory to the discharge chamber, and finally is smoothly discharged through the discharge chamber on the surface of the isolation sleeve and the guide tube, effectively preventing the medium from stagnating at the end of the vortex path and ensuring the smoothness of the cooling circulation.
[0014] Preferably, the flow chamber is connected to the interior of connector one, the discharge chamber is connected to the interior of the connecting frame, and connector two is connected to the interior of the connecting frame. Based on the internal connection between connector one and the flow chamber, connector one can be connected to an external water supply pipe, allowing the cooling medium to flow steadily into the flow chamber of the isolation sleeve through connector one, and then be transported to the guiding space of the vortex guide frame. Simultaneously, through the internal connection link between the discharge chamber, the connecting frame, and connector two, connector two can be connected to an external drain pipe, allowing the cooling medium that has completed heat exchange within the vortex guide frame to first enter the interior of the connecting frame through the discharge chamber, and then smoothly discharge to the drain pipe through connector two. This "supply-drain" link design, with connector one and connector two respectively connecting to the supply and drain pipes, combined with the internal connection structure of each component, ensures that the cooling medium can stably flow into and out of the vortex guide frame along a preset path, providing a reliable guarantee for the continuous operation of the cooling cycle.
[0015] In summary, the technical effects and advantages of this invention are as follows: 1. In this invention, by setting up an assembly device, a double-sealing structure is used to prevent leakage and ensure the reliability of assembly and testing. The sealing ring and gasket of the pressing plate seal the guide cavity and the sensor contact area. Combined with the collar limiting O-ring of the protective cover and the O-ring abutting the outer shell, the double protection greatly reduces the risk of leakage of filling liquid or water source and infiltration of external impurities. The threaded connection design of the pressing plate makes it easy to accurately lock the sensor position during assembly. The funnel-shaped inlet of the guide cavity facilitates the filling liquid filling and the diameter of the guide section matches the sensor detection hole to ensure pressure transmission without deviation. The threaded joint of the guide tube can also simplify the assembly with the coffee machine. The design of the collar inserting into the outer shell and abutting the pressing plate further enhances the overall assembly stability and avoids vibration causing displacement that affects the detection.
[0016] 2. In this invention, by setting up a protective device, isolation protection and stable pressure transmission can be achieved. The rubber diaphragm in the assembly frame can directly isolate the coffee machine water source from the sensor body, preventing water impurities or minerals from corroding the sensor and extending its lifespan. On the fixed base of the positioning frame, the limiting frame and the assembly frame form a "positioning-locking" double fixation through threaded connection and auxiliary limiting, avoiding the medium from seeping in due to loosening of the assembly frame. The pressure ring is tightly abutted against the fixing ring by locking bolts, ensuring that the rubber diaphragm is accurately fixed in the preset position. When squeezed, it only deforms in accordance with regulations, stably transmitting pressure to the filling liquid and then to the sensor, ensuring accurate detection.
[0017] 3. In this invention, by setting up a cooling device, efficient heat dissipation can be achieved for the sensor body and stable operation of the sensor body can be ensured. The vortex guide frame extends the flow path of the cooling medium in the pressing plate, increases the contact time to fully absorb heat, and greatly improves the heat dissipation efficiency. After the cooling medium carries away the heat, it reduces the conduction to the sensor body, avoiding performance drift of the sensor due to high temperature. Connector 1 connects to the flow cavity for the cooling medium to flow in, and connector 2 connects to the discharge cavity through the connecting frame for the medium to discharge, forming a complete circulation link. The sealing part and shielding part of the vortex guide frame prevent the medium from stagnating, ensuring continuous and smooth cooling circulation and providing a stable low-temperature working environment for the sensor. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of a pressure sensor for a home coffee machine according to the present invention; Figure 2 This is a front view of the pressure sensor structure for a home coffee machine according to the present invention; Figure 3 This is a side view of a pressure sensor structure for a home coffee machine according to the present invention; Figure 4 This is a partial structural diagram of a pressure sensor structure for a home coffee machine according to the present invention; Figure 5 This is a schematic diagram of the sensor body structure of a pressure sensor structure for a household coffee machine according to the present invention; Figure 6 This is a cross-sectional view of a pressure sensor structure for a home coffee machine according to the present invention. Figure 7 This is a schematic diagram of the assembly device structure for a pressure sensor structure in a home coffee machine according to the present invention; Figure 8 This invention relates to a pressure sensor structure for a home coffee machine. Figure 7 Schematic diagram of the structure at point A in the middle; Figure 9 This is a partial structural diagram of the assembly device for a pressure sensor structure in a home coffee machine according to the present invention; Figure 10This is a schematic diagram of the protective device structure of a pressure sensor structure for a household coffee machine according to the present invention; Figure 11 This invention relates to a pressure sensor structure for a home coffee machine. Figure 10 A schematic diagram of the cross-sectional structure; Figure 12 This is a schematic diagram of the cooling device structure of a pressure sensor structure for a home coffee machine according to the present invention; Figure 13 This is a schematic diagram of the cooling device portion of a pressure sensor structure for a home coffee machine according to the present invention; Figure 14 This is a partial structural diagram of the cooling device for a pressure sensor structure in a home coffee machine according to the present invention.
[0019] In the diagram: 1. Housing; 2. Cable; 3. Sensor body; 4. Assembly device; 41. Pressing plate; 42. Guide cavity; 43. Sealing ring; 44. Washer; 45. Protective cover; 46. Collar; 47. Rubber ring; 48. Isolation sleeve; 49. Guide tube; 410. Threaded joint; 411. O-ring; 5. Protective device; 51. Positioning frame; 52. Limiting frame; 53. Assembly frame; 54. Groove; 55. Fixing ring; 56. Rubber diaphragm; 57. Pressure ring; 58. Locking bolt; 6. Cooling device; 61. Vortex guide frame; 611. Sealing part; 612. Shielding part; 62. Flow chamber; 63. Connector one; 64. Discharge chamber; 65. Connecting frame; 66. Connector two. Detailed Implementation
[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0021] refer to Figures 1-14The pressure sensor structure for a household coffee machine shown includes a housing 1, a cable 2, and a sensor body 3. The cable 2 is fixedly connected to the lower surface of the housing 1. The sensor body 3 is installed on the inner wall of the housing 1. An assembly device 4 is provided on the upper surface of the housing 1. The assembly device 4 includes a pressing plate 41, which is threadedly connected to the inner wall of the housing 1. A guide cavity 42 is opened on the surface of the pressing plate 41, which communicates with the detection hole of the sensor body 3. A protective cover 45 is threadedly connected to the surface of the housing 1. An isolation sleeve 48 is fixedly connected to the inner wall of the protective cover 45. A guide tube 49 is fixedly connected to the inner wall of the isolation sleeve 48. The guide tube 49 is movably abutting against the upper surface of the pressing plate 41. A threaded connector 410 is fixedly connected to the upper surface of the guide tube 49.
[0022] The guide cavity 42 has a sealing ring 43 fixedly connected to its inner wall, which abuts against the upper surface of the sensor body 3. A mounting groove is formed on the lower surface of the pressing plate 41, and a gasket 44 is fixedly connected to the inner wall of the mounting groove, abutting against the upper surface of the sensor body 3. Based on the abutment structure between the sealing ring 43 and the upper surface of the sensor body 3, a seal is first formed between the inner wall of the guide cavity 42 and the sensor. Simultaneously, the pressing plate 41 abuts against the upper surface of the sensor body 3 through the gasket 44 in the mounting groove, further enhancing the sealing effect between the pressing plate 41 and the sensor. This double-sealing design significantly reduces the probability of leakage of the medium inside the guide cavity 42.
[0023] Among them, a collar 46 is fixedly connected to the inner wall of the protective cover 45, the collar 46 is inserted into the inner wall of the outer shell 1, and the collar 46 is movably abutted against the upper surface of the pressing plate 41. A rubber ring 47 is fixedly connected to the inner wall of the protective cover 45, the rubber ring 47 abuts against the upper surface of the outer shell 1, and the rubber ring 47 is sleeved on the outer arc surface of the collar 46. An annular groove is opened on the lower surface of the guide tube 49, and an O-ring 411 is fixedly connected to the inner wall of the guide tube 49 in the annular groove. The O-ring 411 abuts against the upper surface of the pressing plate 41. The structure of the retaining ring 46 fixed to the inner wall of the protective cover 45 has an outer arc surface that can restrict the position of the sleeved rubber ring 47, ensuring accurate sealing. At the same time, the design of the retaining ring 46 being inserted into the inner wall of the outer shell 1 can supplement the shielding structure at the assembly part of the protective cover 45 and the outer shell 1. Furthermore, the movable contact between the retaining ring 46 and the upper surface of the pressing plate 41 can enhance the overall assembly stability. Finally, the tight contact between the rubber ring 47 and the upper surface of the outer shell 1 effectively improves the sealing strength of the contact part between the protective cover 45 and the outer shell 1.
[0024] The inner wall of the guide cavity 42 is filled with filling liquid, and the inlet of the guide cavity 42 is funnel-shaped. The diameter of the guiding section of the guide cavity 42 is equal to the diameter of the detection hole of the sensor body 3. The structure of the guide cavity 42 provides a structural guarantee for the precise correspondence between the filling liquid and the detection hole. In addition, the funnel-shaped inlet design facilitates efficient filling of the filling liquid and avoids stagnation. With the cooperation of the dual structures, the pressure generated when the filling liquid is squeezed can be transmitted to the sensor body 3 without deviation, ensuring the accuracy of detection.
[0025] The upper surface of the pressing plate 41 is provided with a protective device 5, which includes a positioning frame 51. The positioning frame 51 is fixedly connected to the upper surface of the pressing plate 41. A limiting frame 52 is fixedly connected to the inner wall of the positioning frame 51. An assembly frame 53 is threadedly connected to the inner wall of the positioning frame 51. A groove 54 is formed on the upper surface of the assembly frame 53. A fixing ring 55 is installed on the inner wall of the assembly frame 53 in the groove 54. A rubber film 56 is fixedly connected to the inner wall of the fixing ring 55. A pressure ring 57 is installed on the upper surface of the assembly frame 53. A circular groove is formed on the upper surface of the pressure ring 57. A locking bolt 58 is inserted into the inner wall of the hole and the pressure ring 57. The locking bolt 58 is threadedly connected to the inner wall of the assembly frame 53. Based on the fixed base of the positioning frame 51 and the pressing plate 41, the limiting frame 52 fixed on its inner wall can form an auxiliary limit for the assembly frame 53 threaded to the positioning frame 51. Together with the threaded connection, it forms a "positioning-locking" double fixing structure. On the one hand, it ensures that the assembly frame 53 is accurately installed in the preset position. On the other hand, it significantly enhances its stability and firmness in use, thereby reducing the probability of the medium seeping into the interior of the assembly frame 53.
[0026] The inner walls of the limiting frame 52 and the assembly frame 53 are threaded together. The cavity formed by the limiting frame 52 and the assembly frame 53 is filled with filling fluid. The pressure ring 57 abuts against the upper surface of the fixing ring 55. Relying on the connection between the pressure ring 57 and the assembly frame 53, the pressure ring 57 can tightly abut against the upper surface of the fixing ring 55, forming a rigid limit on the fixing ring 55. This ensures that the fixing ring 55 and the rubber diaphragm 56 on the inner wall are accurately fixed in the preset position of the assembly frame 53. This fixing structure allows the rubber diaphragm 56 to undergo compliant deformation when squeezed by the medium, and can stably transmit the pressure to the filling fluid in the cavity of the limiting frame 52 and the assembly frame 53, ensuring the continuity and accuracy of pressure transmission.
[0027] The isolation sleeve 48 is provided with a cooling device 6, which includes a vortex guide frame 61. The vortex guide frame 61 is fixedly connected to the lower surface of the isolation sleeve 48 and inserted into the inner wall of the pressing plate 41. A flow cavity 62 is opened on the arc surface of the isolation sleeve 48. A connector 63 is fixedly connected to the inner wall of the outer shell 1. Discharge cavities 64 are opened on the surfaces of both the isolation sleeve 48 and the guide pipe 49. A connecting frame 65 is fixedly connected to the inner wall of the outer shell 1, and a connector 66 is fixedly connected to the inner wall of the connecting frame 65. The vortex guide frame 61 and the lower surface of the isolation sleeve 48 are connected to the lower surface of the isolation sleeve 48. The fixed connection of the surface and its insertion into the inner wall of the pressing plate 41 can accurately guide the cooling medium flowing in from the arc flow cavity 62 of the isolation sleeve 48. The vortex structure can extend the flow path of the medium inside the pressing plate 41, thereby increasing the contact time between the medium and the pressing plate 41. During this process, the medium can fully absorb the heat on the pressing plate 41 and finally discharge it through the discharge cavity 64 on the surface of the isolation sleeve 48 and the guide tube 49, effectively improving the heat exchange efficiency, thereby reducing the conduction of heat to the sensor body 3 and reducing the thermal impact on the sensor body 3.
[0028] The vortex guide frame 61 has a sealing part 611 fixedly connected to its surface, which abuts against the inner wall of the pressing plate 41. A shielding part 612 is fixedly connected to the inner side of the vortex guide frame 61, which is fixedly connected to the lower surface of the guide tube 49 and inserted into the inner wall of the pressing plate 41. Relying on the shielding part 612 fixed to the inner side of the vortex guide frame 61, a structural blockage can be formed at the end of the vortex guide frame 61 near the discharge chamber 64, cutting off the subsequent space in the extension direction of the vortex guide frame 61. Together with the sealing of the sealing part 611 on the surface of the vortex guide frame 61 and the inner wall of the pressing plate 41, the flow direction of the medium in the vortex path is limited, ensuring that the cooling medium entering the vortex guide frame 61 from the flow chamber 62 flows along the preset trajectory to the discharge chamber 64, and finally is discharged smoothly through the discharge chamber 64 on the surface of the isolation sleeve 48 and the guide tube 49, effectively preventing the medium from stagnating at the end of the vortex path and ensuring the smoothness of the cooling circulation.
[0029] The flow chamber 62 is internally connected to the connector 63, the discharge chamber 64 is internally connected to the connecting frame 65, and the connector 66 is internally connected to the connecting frame 65. Based on the internal connection between the connector 63 and the flow chamber 62, the connector 63 can be connected to an external water supply pipe, allowing the cooling medium to flow steadily into the flow chamber 62 of the isolation sleeve 48 through the connector 63, and then be transported to the guiding space of the vortex guide frame 61. Simultaneously, through the internal connection link between the discharge chamber 64, the connecting frame 65, and the connector 66, the connector 66 can be connected to an external drain pipe, allowing the cooling medium that has completed heat exchange within the vortex guide frame 61 to first enter the connecting frame 65 through the discharge chamber 64, and then smoothly discharge to the drain pipe through the connector 66. This "supply-drain" link design, with the connectors 63 and 66 respectively connecting to the supply and drain pipes, combined with the internal connection structure of each component, ensures that the cooling medium can stably flow into and out of the vortex guide frame 61 along a preset path, providing a reliable guarantee for the continuous operation of the cooling cycle.
[0030] Working principle of the invention: When assembling the pressure sensor, the housing 1 is clamped with a clamp and the mounting cavity of the housing 1 faces upward. The sensor body 3 is placed in the reserved mounting cavity of the housing 1. Then, the pressing plate 41 is taken out and placed in the housing 1. The pressing plate 41 is rotated and gradually tightened. After the pressing plate 41 is completely locked, the pressing plate 41 and the washer 44 press and lock the sensor body 3. After completing the above operations, use a syringe to inject filling liquid into the guide cavity 42 and the filling cavity composed of the positioning frame 51, the limiting frame 52 and the assembly frame 53. After the filling liquid completely fills the filling cavity, place the fixing ring 55 in the groove 54 of the assembly frame 53, cover the pressure ring 57, and then use the locking bolt 58 to lock the pressure ring 57. After the pressure ring 57 is locked, the assembly of the protective device 5 is completed. After the protective device 5 is assembled, the protective cover 45 is installed on the outer shell 1 and the protective cover 45 is tightened. During the rotation of the protective cover 45, the collar 46, rubber ring 47, isolation sleeve 48, guide tube 49 and O-ring 411 are driven. The collar 46 is inserted into the outer shell 1 and abuts against the upper surface of the pressing plate 41. The rubber ring 47 is pushed against the upper surface of the outer shell 1. The isolation sleeve 48 cooperates with the outer shell 1 to press the guide tube 49 and O-ring 411 above the pressing plate 41. When the user locks the protective cover 45, the assembly operation of the assembly device 4 is completed. When the user needs to install the sensor on the coffee machine, the user can use the threaded connector 410 on the guide tube 49 to install the sensor structure on the designated monitoring position of the coffee machine. After the initial installation of the sensor is completed, the pre-installed cooling medium pipe on the coffee machine is connected to connector 63 and the discharge pipe is connected to connector 66. Then, when the coffee machine is working, the cooling medium, such as cold water, can be injected into the vortex guide frame 61 through connector 63 and flow chamber 62. Under the guidance of the vortex guide frame 61, the cold water flows in the designated direction and carries away the heat on the pressing plate 41 during the flow. At the same time, the cold water that has completed the heat exchange is discharged through the discharge chamber 64. During the monitoring process, the water source of the coffee machine enters the guide pipe 49 through the water path. When the water source enters the guide pipe 49, the guide pipe 49 delivers the water source to the rubber diaphragm 56. At this time, the water source squeezes the rubber diaphragm 56 under its own pressure. The rubber diaphragm 56 deforms under force and simultaneously squeezes the filling liquid in the filling chamber. During the squeezing process, the filling liquid is squeezed by force to squeeze the diaphragm of the sensor body 3, thereby transmitting the water pressure synchronously to the pressure sensor, so that the pressure sensor can monitor the pressure of the water source without contacting the water source.
[0031] By setting up the assembly device 4, a double sealing structure is used to prevent leakage and ensure the reliability of assembly and testing. The sealing ring 43 and gasket 44 of the pressing plate 41 seal the guide cavity 42 and the sensor contact area. Combined with the collar 46 of the protective cover 45 limiting the O-ring 411, and the O-ring 411 abutting against the outer shell 1, the double protection greatly reduces the risk of leakage of filling liquid or water source and infiltration of external impurities. The threaded connection design of the pressing plate 41 makes it easy to accurately lock the sensor position during assembly. The funnel-shaped inlet of the guide cavity 42 facilitates the filling liquid filling and the diameter of the guide section matches the sensor detection hole to ensure pressure transmission without deviation. The threaded joint 410 of the guide tube 49 can also simplify the assembly with the coffee machine. The design of the collar 46 inserting into the outer shell 1 and abutting against the pressing plate 41 further enhances the overall assembly stability and avoids vibration causing displacement that affects the detection.
[0032] By setting up the protective device 5, isolation protection and stable pressure transmission can be achieved. The rubber diaphragm 56 inside the assembly frame 53 can directly isolate the coffee machine water source from the sensor body 3, preventing water impurities or minerals from corroding the sensor and extending its lifespan. On the fixed base of the positioning frame 51, the limiting frame 52 and the assembly frame 53 form a "positioning-locking" double fixation through threaded connection and auxiliary limiting, preventing the assembly frame 53 from loosening and causing the medium to seep in. The pressure ring 57 tightly abuts against the fixing ring 55 through the locking bolt 58, ensuring that the rubber diaphragm 56 is accurately fixed in the preset position. When squeezed, it only deforms in accordance with regulations, and the pressure is stably transmitted to the filling liquid and then to the sensor, ensuring accurate detection.
[0033] By setting up the cooling device 6, efficient heat dissipation can be achieved for the sensor body 3 and the stable operation of the sensor body 3 can be ensured. The vortex guide frame 61 extends the flow path of the cooling medium in the pressing plate 41, increases the contact time to fully absorb heat, and greatly improves the heat dissipation efficiency. After the cooling medium carries away the heat, it reduces the conduction to the sensor body 3, and avoids the sensor's performance drift due to high temperature. The connector 1 63 connects to the flow cavity 62 to allow the cooling medium to flow in, and the connector 2 66 connects to the discharge cavity 64 through the connecting frame 65 to allow the medium to discharge, forming a complete circulation link. The sealing part 611 and the shielding part 612 of the vortex guide frame 61 prevent the medium from stagnating, ensure the continuous smooth cooling circulation, and provide a stable low-temperature working environment for the sensor.
[0034] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can control it.
[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A domestic coffee machine pressure sensor structure comprising a housing (1), a cable (2) and a sensor body (3), characterized in that: The cable (2) is fixedly connected to the lower surface of the housing (1). The sensor body (3) is installed on the inner wall of the housing (1). An assembly device (4) is provided on the upper surface of the housing (1). The assembly device (4) includes a pressing plate (41). The pressing plate (41) is threadedly connected to the inner wall of the housing (1). A guide cavity (42) is opened on the surface of the pressing plate (41). The guide cavity (42) is connected to the detection hole of the sensor body (3). A protective cover (45) is threadedly connected to the surface of the housing (1). An isolation sleeve (48) is fixedly connected to the inner wall of the protective cover (45). A guide tube (49) is fixedly connected to the inner wall of the isolation sleeve (48). The guide tube (49) is movably abutted against the upper surface of the pressing plate (41). A threaded joint (410) is fixedly connected to the upper surface of the guide tube (49). A sealing ring (43) is fixedly connected to the inner wall of the guide cavity (42). The sealing ring (43) abuts against the upper surface of the sensor body (3). An assembly groove is opened on the lower surface of the pressing plate (41). A gasket (44) is fixedly connected to the inner wall of the pressing plate (41) in the assembly groove. The gasket (44) abuts against the upper surface of the sensor body (3). The inner wall of the protective cover (45) is fixedly connected with a collar (46), the collar (46) is inserted into the inner wall of the outer shell (1), the collar (46) is in movable contact with the upper surface of the pressing plate (41), the inner wall of the protective cover (45) is fixedly connected with a rubber ring (47), the rubber ring (47) is in contact with the upper surface of the outer shell (1), the rubber ring (47) is sleeved on the outer arc surface of the collar (46), the lower surface of the guide tube (49) is provided with an annular groove, the guide tube (49) is fixedly connected with an O-ring (411) on the inner wall of the annular groove, and the O-ring (411) is in contact with the upper surface of the pressing plate (41). The upper surface of the pressing plate (41) is provided with a protective device (5). The protective device (5) includes a positioning frame (51). The positioning frame (51) is fixedly connected to the upper surface of the pressing plate (41). A limiting frame (52) is fixedly connected to the inner wall of the positioning frame (51). An assembly frame (53) is threadedly connected to the inner wall of the positioning frame (51). A groove (54) is opened on the upper surface of the assembly frame (53). A fixing ring (55) is installed on the inner wall of the groove (54) of the assembly frame (53). A rubber film (56) is fixedly connected to the inner wall of the fixing ring (55). A pressure ring (57) is installed on the upper surface of the assembly frame (53). A round hole is opened on the upper surface of the pressure ring (57). A locking bolt (58) is inserted into the inner wall of the round hole of the pressure ring (57). The locking bolt (58) is threadedly connected to the inner wall of the assembly frame (53).
2. A pressure sensor structure for a domestic coffee machine according to claim 1, characterized in that: The inner wall of the guide cavity (42) is filled with filling liquid. The inlet of the guide cavity (42) is funnel-shaped. The diameter of the guide section of the guide cavity (42) is equal to the diameter of the detection hole of the sensor body (3).
3. A pressure sensor structure for a domestic coffee machine according to claim 1, characterized in that: The limiting frame (52) is threaded to the inner wall of the assembly frame (53), and the cavity formed by the limiting frame (52) and the assembly frame (53) is filled with filling liquid. The pressure ring (57) abuts against the upper surface of the fixing ring (55).
4. A pressure sensor structure for a domestic coffee machine according to claim 1, characterized in that: The surface of the isolation sleeve (48) is provided with a cooling device (6), the cooling device (6) includes a vortex guide frame (61), the vortex guide frame (61) is fixedly connected to the lower surface of the isolation sleeve (48), the vortex guide frame (61) is inserted into the inner wall of the pressing plate (41), the arc surface of the isolation sleeve (48) is provided with a flow cavity (62), the inner wall of the outer shell (1) is fixedly connected with a connector one (63), the surfaces of the isolation sleeve (48) and the guide tube (49) are both provided with a discharge cavity (64), the inner wall of the outer shell (1) is fixedly connected with a connecting frame (65), and the inner wall of the connecting frame (65) is fixedly connected with a connector two (66).
5. A pressure sensor structure for a domestic coffee machine according to claim 4, characterized in that: The surface of the vortex guide frame (61) is fixedly connected to a blocking part (611), which abuts against the inner wall of the pressing plate (41). The inner side of the vortex guide frame (61) is fixedly connected to a shielding part (612), which is fixedly connected to the lower surface of the guide tube (49) and inserted into the inner wall of the pressing plate (41).
6. A pressure sensor structure for a domestic coffee machine according to claim 4, characterized in that: The flow chamber (62) is connected to the interior of connector one (63), the discharge chamber (64) is connected to the interior of the connecting frame (65), and the connector two (66) is connected to the interior of the connecting frame (65).