Tennis ball can pressurizing cap

Abstract

The application provides a tennis ball tank pressurizing cover, belonging to the technical field of tennis equipment storage. The tennis ball tank pressurizing cover comprises a shell assembly, a pressurizing assembly, a pressure relief assembly and a tank mouth adapter. The shell assembly is used for accommodating internal components and connecting with the tennis ball tank. The pressurizing assembly is installed inside the shell assembly and is used for unidirectionally pumping external gas into the internal space of the tennis ball tank and blocking the reverse flow of the gas after stopping working. The pressure relief assembly is installed on the shell assembly and is used for controllably releasing the internal gas pressure of the tennis ball tank. The tank mouth adapter is an annular component independent of the shell assembly and is detachably fixed to the tank mouth flange of the tennis ball tank. When locked with the shell assembly, the tank mouth adapter converts the screwing torque into axial thrust to force the tank mouth flange and the bottom end seal of the shell assembly to be pressed tightly to form an end face seal. The application uses a commercial tennis ball tank as a pressure-bearing container to realize the controllable adjustment and maintenance of the gas pressure in the tank while reducing the cost of the device.

Description

Technical Field

[0001] This invention belongs to the field of tennis equipment storage technology, specifically relating to a pressure cap for tennis cans. Background Technology

[0002] Pressurized tennis balls are manufactured with cans filled with gas at a pressure higher than atmospheric pressure to maintain the internal pressure and elasticity of the balls. After opening, the gas inside the ball slowly escapes, causing a decrease in elasticity. To extend the effective lifespan of the tennis balls, they must be stored in a pressurized environment after opening.

[0003] Currently, devices used for pressurized storage of tennis balls generally employ a self-contained pressure vessel structure. That is, the device itself includes a sealed tank capable of withstanding a specified internal pressure, and a pressurization mechanism that works in conjunction with this tank. The pressurization mechanism increases the internal pressure of the tank by changing its internal volume or pumping gas into it. Implementing such devices requires the specialized manufacture of tanks that meet pressure requirements; the selection of tank materials, wall thickness design, and airtightness testing all contribute to the overall cost of the device. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a pressure cap for tennis ball cans.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: a pressure cap for tennis ball tanks, applied to tennis ball tanks, comprising:

[0006] The housing assembly is used to house the internal components and form a connection with the tennis can;

[0007] The pressurization assembly, installed inside the housing assembly, is used to pump external gas unidirectionally into the internal space of the tennis can and to prevent backflow of gas after operation is stopped;

[0008] The pressure relief assembly, installed on the housing assembly, is used to block the communication between the internal space of the tennis can and the external atmosphere when closed, and to allow the communication between the internal space of the tennis can and the external atmosphere when open.

[0009] The can opening adapter is an annular component independent of the shell assembly. It is detachably fixed to the flange of the tennis can opening and converts the turning torque into axial thrust when the shell assembly and the can opening adapter are locked together through the connecting structure, forcing the flange of the can opening to press against the seal at the bottom of the shell assembly to form an end face seal.

[0010] Preferably, the can opening adapter includes a threaded fastener and a sealing element.

[0011] The threaded thread is a discontinuous, non-closed ring component with a partial circumferential break to form an opening. The lower part of the inner circumferential surface of the threaded thread has a radially inward protruding inner step surface, the top of the threaded thread has an upper end face, and the outer circumferential surface of the threaded thread has an external thread.

[0012] The third seal is an annular elastomer, which is embedded in the annular groove provided on the bottom end face of the housing assembly, and partially protrudes from the bottom end face of the housing assembly in the free state.

[0013] The threaded fastener is installed in the neck area below the flange of the tennis ball can, with the upper surface of the inner stepped surface in contact with the lower end face of the flange. When the shell assembly and the threaded fastener are locked together by the threaded pair, the upper end face of the threaded fastener pushes the flange, forcing the upper end face of the flange to press against the seal.

[0014] Preferably, the circumferential notch width of the opening is 0.1 mm to 5 mm, and the radial width of the inner step surface is 0.5 mm to 4 mm.

[0015] Preferably, the housing assembly includes a top cover and a base;

[0016] The top cover and the base are fixedly connected by fasteners. The inner circumferential wall of the base has an internal thread that engages with the external thread of the threaded buckle.

[0017] Preferably, the pressurization assembly includes a pressurization button, an air pump, a one-way air inlet valve, and a seal.

[0018] The pressure button is installed on the top surface of the cover;

[0019] The air pump is fixedly installed inside the cavity of the housing assembly, with the air inlet port connected to the outside atmosphere and the air outlet port connected to the air inlet end of the one-way air inlet valve.

[0020] A one-way air inlet valve is located in the gas flow path between the air pump outlet port and the internal space of the tennis can;

[0021] A set of seals is installed at the junction of the air pump's outlet port and the one-way inlet valve's inlet port.

[0022] Preferably, the pressure relief assembly includes a pressure relief button, a one-way vent valve, and a second seal.

[0023] The pressure relief button is installed on the top surface of the cover and is arranged circumferentially at intervals from the pressure increase button;

[0024] A one-way vent valve is located in the venting channel between the interior space of the tennis ball tank and the outside atmosphere;

[0025] The second seal is located between the mounting surfaces of the one-way exhaust valve and the base.

[0026] Preferably, it also includes a control unit, which is installed inside the housing assembly and includes a battery, a motherboard, a sensor board, and a seal.

[0027] The battery is electrically connected to the motherboard and supplies power to the air pump and the motherboard;

[0028] The motherboard integrates a central processing unit, which is electrically connected to the pressurization button, air pump, and sensor board.

[0029] The sensor board is equipped with a pressure sensor, and the sensing surface of the pressure sensor is connected to the internal space of the tennis can through a vent hole opened in the housing assembly.

[0030] Four sets of seals are installed around the outer periphery of the pressure sensor.

[0031] Preferably, the central processing unit is configured to: receive the air pressure sensing signal transmitted by the sensor board, and control the air pump to stop when the air pressure value reaches the preset target air pressure value; when the air pressure value is detected to have decayed to below the preset air replenishment start threshold, automatically wake up and control the air pump to start replenishing air until the air pressure recovers to the preset target value and then stops again.

[0032] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0033] The can-mouth adapter uses a combination of an open threaded connection and a third seal. The opening of the threaded connection provides radial elastic deformation capability. During installation, it elastically expands and snaps into the underside of the can-mouth flange, with elastic restoring force achieving a tight seal. When the shell assembly is tightened, the upper end face of the threaded connection pushes the upper end face of the can-mouth flange and the third seal axially to form an end-face seal. During the application of force, the axial normal pressure between the can-mouth flange, the threaded connection, and the third seal generates static friction, restricting circumferential relative rotation. This ensures that the third seal only bears axial compressive force and not circumferential shear force, reducing wear and fatigue. The open threaded connection is compatible with can-mouth flanges of different outer diameters through elastic deformation. The same specification of can-mouth adapter can be used for various standard tennis cans with outer diameter tolerances within 3mm.

[0034] The pressurization assembly includes a pressurization button, an air pump, a one-way air inlet valve, and a seal. A seal is located at the junction of the air pump outlet and the one-way air inlet valve inlet to prevent gas leakage. When the user presses the pressurization button, the air pump operates, pumping external gas into the sealed cavity through the one-way air inlet valve; after the air pump stops, the one-way air inlet valve prevents backflow. The depressurization assembly includes a depressurization button, a one-way exhaust valve, and a seal. The depressurization button is located on the same top surface as the pressurization button. The exhaust latch of the one-way exhaust valve locks the exhaust valve stem in the open position, enabling continuous depressurization. The seal prevents unintended leakage at the mating surface between the exhaust valve body and the base. A petal-shaped structure is provided on the top of the bottom cover; when retrieving the ball, the elastic petals apply a radial contraction force to the tennis ball, causing the tennis ball to be squeezed out one by one.

[0035] The control unit is integrated into the housing and includes a battery, mainboard, sensor board, and four seals. The air pressure sensor on the sensor board connects to the internal space of the tank through a through-hole in the bottom cover. The four seals are fitted around the air pressure sensor to prevent gas leakage and moisture ingress. The central processing unit receives the air pressure sensing signal and stops the air pump when the air pressure reaches a preset target value. In static storage, when the air pressure decreases below the replenishment threshold, the air pump automatically starts to replenish air and restores it to the target value before stopping. After depressurization, it detects instantaneous changes in air pressure and enters low-power standby mode to reduce energy consumption.

[0036] The can-mouth adapter secures the tennis ball can as a pressure vessel. The pressurization and depressurization components are centrally located on the top surface of the shell, while the control unit is integrated inside. During assembly and sealing, the can-mouth adapter elastically clamps the can-mouth flange and seals it against the end face of the sealing element. During pressurization and pressure maintenance, the pressurization component pumps air in one direction, and the control unit monitors the air pressure in real time and automatically controls the pump's start and stop. During depressurization and ball removal, the depressurization component releases the air pressure, the control unit switches to low power mode, and the tennis balls are removed one by one through the petal-shaped structure. All components work together in continuous operation to regulate and maintain the internal air pressure using the tennis ball can. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the pressure cap on a tennis ball can;

[0039] Figure 2 This is a structural diagram of the pressurization assembly, tank port adapter, and control unit;

[0040] Figure 3 This is a cross-section of the pressure cap of a tennis ball can. Figure 1 ;

[0041] Figure 4 This is a schematic diagram of the pressure relief assembly;

[0042] Figure 5 This is a cross-section of the pressure cap of a tennis ball can. Figure 2 ;

[0043] In the diagram: 1. Housing assembly; 11. Top cover; 12. Base; 13. Bottom cover; 2. Pressurization assembly; 21. Pressurization button; 22. Air pump; 23. One-way air inlet valve; 24. Seal 1; 3. Pressure relief assembly; 31. Pressure relief button; 32. One-way exhaust valve; 33. Seal 2; 4. Can opening adapter; 41. Threaded thread; 411. Opening; 412. External thread; 42. Seal 3; 5. Control unit; 51. Battery; 52. Main board; 53. Sensor board; 54. Seal 4; 6. Tennis can; 61. Can opening flange. Detailed Implementation

[0044] 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.

[0045] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] Application Overview:

[0049] The integrated pressure vessel structure directly links the production cost of the device to the manufacturing of the pressure tank. To meet pressure and airtightness requirements, the tank must utilize specific materials and processes, resulting in a higher overall cost for the device. Furthermore, the packaging cans received by users each time they purchase pressurized tennis balls are themselves pressurized containers that meet airtightness standards, but they are typically left idle or discarded after opening, leading to resource waste. This contradictory phenomenon has long existed but has not been addressed or resolved by existing technologies.

[0050] Existing technologies generally treat the pressurizing mechanism and the pressure vessel as an inseparable whole, without realizing that the pressure vessel can be separated from the main body of the device and the function can be performed by using a commercial tennis ball can that is already owned by the user and has standard airtight structural features.

[0051] To address the aforementioned issues, this invention provides a pressurized cap for tennis cans. By integrating the pressurization function and sealing interface into a modular structure and incorporating detachable connecting components adapted to the existing structural features of commercial tennis cans, the commercial tennis cans function as pressure-bearing containers, thereby enabling the regulation and maintenance of internal air pressure without the need to manufacture a dedicated can body.

[0052] Exemplary device:

[0053] like Figures 1 to 5 As shown, a pressure cap for a tennis ball can is applied to a tennis ball can 6. It includes a shell assembly 1, a pressure assembly 2, a pressure relief assembly 3, and a can opening adapter 4. It is used to regulate and maintain the internal air pressure of the tennis ball can 6 so as to achieve long-term pressure preservation and storage of pressurized tennis balls inside the tennis ball can 6.

[0054] like Figure 1 As shown, the housing assembly 1 includes an upper cover 11, a base 12, and a bottom cover 13.

[0055] The top cover 11 is located at the axial top of the housing assembly 1, has a closed top surface and circumferentially continuous sidewalls, forming a downwardly open receiving cavity, and is fixedly connected to the base 12 by fasteners.

[0056] The base 12 is located between the upper cover 11 and the bottom cover 13, and has a circumferentially continuous side wall. The inner circumferential wall has an internal thread. The upper end is fixedly connected to the upper cover 11 by fasteners, and the lower end is axially fixed to the bottom cover 13 by a snap-fit ​​structure between its outer circumferential wall and the inner circumferential wall of the bottom cover 13, thus connecting the upper cover 11 and the bottom cover 13.

[0057] The bottom cover 13 is located at the axial bottom end of the shell assembly 1, and has a closable petal-shaped structure on its top. The petal-shaped structure consists of multiple elastic petals arranged circumferentially. In its natural state, each petal converges towards the center to form a constriction. A through vent hole is provided on the petal-shaped structure. The inner peripheral wall of the bottom cover 13 is axially engaged and fixed to the outer peripheral wall of the base 12 by a snap-fit ​​structure. The vent hole connects the internal space of the shell assembly 1 with the internal space of the tennis ball tank 6. The petal-shaped structure guides and limits the removal of pressurized tennis balls.

[0058] The tennis ball can 6 is located axially below the shell assembly 1. It is a sealed container with one end open. The can mouth is provided with an outwardly folded can mouth flange 61. The can mouth flange 61 and the can mouth adapter 4 are engaged. The open end face and the bottom surface of the bottom cover 13 are sealed together to accommodate pressurized tennis balls to be stored under pressure.

[0059] like Figure 2 and Figure 3 As shown, the can opening adapter 4 is an annular component independent of the shell assembly 1, installed in the can opening area of ​​the tennis can 6. The inner circumference of the can opening adapter 4 mates with the can opening flange 61 of the tennis can 6, and the outer circumferential surface has a connection structure adapted to the internal thread of the base 12. The axial top end mates with the bottom end of the shell assembly 1. The can opening adapter 4 is detachably fixed to the can opening flange 61 of the tennis can 6. When the shell assembly 1 is locked to itself through the connection structure, the turning torque is converted into axial thrust, forcing the can opening flange 61 to press against the bottom seal of the shell assembly 1, forming an end face seal.

[0060] The pressurization component 2 is installed inside the housing component 1 and is connected to the external atmosphere and the internal space of the tennis ball tank 6. It is used to pump external gas into the internal space of the tennis ball tank 6 and to block the backflow of gas inside the tennis ball tank 6 to the outside after the operation stops.

[0061] The pressure relief assembly 3 is installed on the shell assembly 1 and is connected to the internal space of the tennis ball can 6 and the external atmosphere respectively. It is used to block the connection between the internal space of the tennis ball can 6 and the external atmosphere when closed; at the same time, it opens the connection between the internal space of the tennis ball can 6 and the external atmosphere when open, releasing the air pressure inside the tennis ball can 6.

[0062] The typical operating conditions of the aforementioned tennis ball can pressure cap include assembly and sealing, pressurization and pressure holding, and depressurization and ball removal.

[0063] In the assembly and sealing process, the user fixes the can mouth adapter 4 to the can mouth flange 61 of the tennis can 6, and screws the shell assembly 1 into the can mouth adapter 4 through the internal thread of the base 12. The can mouth adapter 4 converts the torque during the screwing process into axial thrust, which forces the can mouth flange 61 of the tennis can 6 to press against the bottom seal of the shell assembly 1 to form a sealed receiving cavity.

[0064] Under pressurization and pressure maintenance conditions, the pressurization component 2 pumps gas from the outside atmosphere into the tennis ball can 6, increasing the air pressure inside the tennis ball can 6. Once the preset air pressure is reached, the pressurization component 2 stops working, blocking the backflow of gas and maintaining stable air pressure inside the sealed cavity.

[0065] In the depressurization and ball retrieval operation, the depressurization component 3 connects the sealed cavity inside the tennis ball can 6 with the external atmosphere, allowing the high-pressure gas inside the tennis ball can 6 to escape into the atmosphere until the internal air pressure of the tennis ball can 6 is balanced with the external atmospheric pressure. The user then removes the pressurized tennis balls from the tennis ball can 6 through the petal-shaped structure of the bottom cover 13. The petal-shaped structure of the bottom cover 13 applies a radial contraction force to the passing pressurized tennis balls, thus enabling the pressurized tennis balls to be discharged one by one.

[0066] The tennis can pressure cap described in the above exemplary device integrates the functions of pressurization, pressure holding and pressure relief in the housing component 1. It achieves a detachable connection with the tennis can 6 through an independent can port adapter 4, so that the tennis can 6 can be used as a pressure vessel without the need for an additional dedicated pressure vessel body, thereby achieving controllable adjustment and stable maintenance of the internal air pressure of the tennis can.

[0067] The aforementioned tank port adapter 4, pressurization component 2, and pressure relief component 3 can be implemented by various specific structures. The following embodiments will further illustrate the specific construction of each component.

[0068] Example 1:

[0069] The tennis can pressure cap described in the exemplary device has a can opening adapter 4 that is detachably fixed to the can opening flange 61 of the tennis can 6. When the housing assembly 1 is locked to itself through the connecting structure, the turning torque is converted into axial thrust, which forces the can opening flange 61 to press against the bottom seal of the housing assembly 1 to form an end face seal.

[0070] This embodiment further proposes a specific structural implementation of the can mouth adapter 4. The can mouth adapter 4 needs to be compatible with tennis cans 6 of different brands or batches to achieve stable clamping and axial compression sealing with the can mouth flange 61. If a rigid, circular adapter is used, under the condition that the outer diameter of the can mouth flange 61 has a tolerance fluctuation of 1mm to 3mm, it is difficult to complete the installation when the dimensional interference is large, and it may even cause plastic deformation of the can mouth flange 61; when the dimensional interference is small, it is not possible to form an effective clamping of the can mouth flange 61, and the shell assembly 1 is easily pushed out by high-pressure gas after pressurization.

[0071] Therefore, the can opening adapter 4 in this embodiment adopts the following structure.

[0072] like Figure 2 and Figure 3 As shown, the can opening adapter 4 includes a threaded buckle 41 and a sealing element 42.

[0073] The threaded fastener 41 is a discontinuous, non-closed annular component with a partial circumferential break forming an opening 411. It is installed in the neck region below the flange 61 of the tennis ball can 6. Its inner circumferential surface is clearance-fitted with the outer circumferential surface of the neck of the tennis ball can 6, while its outer circumferential surface is opposite to the inner circumferential surface of the base 12. The circumferential notch width of the opening 411 ranges from 0.1mm to 5mm, allowing the threaded fastener 41 to elastically expand under radial outward force and return to its original position after the external force is removed, relying on the elastic restoring force of its own material. The non-closed structure of the opening 411 provides space for radial deformation of the threaded fastener 41, enabling it to adapt to can flanges 61 of different outer diameters through elastic expansion and contraction, thus solving the problem that rigid, continuous annular structures cannot accommodate the dimensional tolerances of the can flange 61.

[0074] The lower part of the inner circumferential surface of the threaded thread 41 has a radially inwardly protruding inner stepped surface. The diameter of the circumference of the inner stepped surface is slightly smaller than the outer diameter of the can opening flange 61 of the tennis ball can 6, and the radial width of the inner stepped surface is 0.5mm to 4mm. The upper surface of the inner stepped surface is an annular plane perpendicular to the axis, which contacts the lower end face of the can opening flange 61 in the installed state. The radial width of the inner stepped surface is set to ensure sufficient contact area with the lower end face of the can opening flange 61, providing a stable support surface for axial pressing. At the same time, the radially inwardly protruding structure can axially limit the can opening flange 61, preventing the threaded thread 41 from axially separating from the can opening flange 61 during installation.

[0075] The top of the threaded fastener 41 has an upper end face, which is an annular plane perpendicular to the axis. In the installed state, it is positioned opposite the lower end face of the can opening flange 61, and forms surface contact with the lower end face of the can opening flange 61 during the tightening of the housing assembly 1. As an axial force-applying surface, the upper end face can evenly transmit the force to the entire lower end face of the can opening flange 61 under the axial force generated by the threaded pair engagement, causing the can opening flange 61 to produce uniform axial displacement. This ensures that the pressing stress between the upper end face of the can opening flange 61 and the sealing element 42 is evenly distributed, avoiding seal failure caused by local stress concentration.

[0076] The outer circumferential surface of the threaded thread 41 has an external thread 412. The pitch and tooth profile of the external thread 412 match the internal thread of the base 12. In the installed state, it engages with the internal thread of the base 12 to form a threaded pair connection. The engagement between the external thread 412 and the internal thread of the base 12 can convert the circumferential twisting motion of the housing assembly 1 into axial linear motion, providing a continuous and controllable axial thrust for the clamping of the can opening flange 61 and the sealing element 42. At the same time, the self-locking characteristic of the threaded pair can maintain the clamping state and prevent loosening during pressurization.

[0077] The sealing element 42 is an annular elastomer, embedded in the annular groove on the bottom surface of the bottom cover 13. Its outer circumferential surface transitions with the inner wall of the annular groove, one axial end abuts against the bottom surface of the annular groove, and the other axial end partially protrudes from the bottom surface of the bottom cover 13 in a free state. The cross-sectional diameter of the sealing element 42 is greater than the depth of the annular groove. This design ensures that the sealing element 42 can generate sufficient compression during axial compression, forming a continuous surface contact sealing band to block the leakage path of gas inside the tennis ball can 6. Simultaneously, the embedded structure of the annular groove provides radial restraint to the sealing element 42, preventing radial movement during compression and maintaining the stability of the seal.

[0078] Under the assembly and sealing conditions of the tennis can pressure cap, a radial outward support force is applied to the threaded thread 41, causing the threaded thread 41 to elastically expand from the opening 411, increasing its inner diameter to be larger than the outer diameter of the can opening flange 61, and the threaded thread 41 is radially inserted into the lower part of the can opening flange 61 of the tennis can 6; after the outward support force is removed, the threaded thread 41 contracts by relying on the elastic restoring force, and is tightened in the neck area below the can opening flange 61, and the upper surface of the inner step surface forms a surface contact with the lower end surface of the can opening flange 61, thus completing the pre-fixation of the threaded thread 41 and the tennis can 6.

[0079] The housing assembly 1 is screwed into the external thread 412 of the threaded buckle 41 via the internal thread of the base 12. As the screwing depth increases, the base 12 drives the bottom cover 13 to move downward along the axial direction. The sealing element 3 42 embedded on the bottom surface of the bottom cover 13 gradually approaches the upper end face of the can opening flange 61. When the lower end face of the sealing element 3 42 contacts the upper end face of the can opening flange 61, the housing assembly 1 is screwed in again. The upper end face of the threaded buckle 41 serves as the force application surface, pushing the can opening flange 61 upward. This forces the upper end face of the can opening flange 61 to form a strong pressure with the sealing element 3 42. The sealing element 3 42 enters a compressed state from a free state, filling the gap between the annular groove on the bottom surface of the bottom cover 13 and the upper end face of the can opening flange 61, forming a continuous end face sealing structure.

[0080] During the tightening process of the housing assembly 1, the can opening flange 61 is axially pressed between the upper end face of the threaded buckle 41 and the sealing element 42. The housing assembly 1 and the threaded buckle 41 rotate relative to each other through the threaded pair. The upper end face of the threaded buckle 41 and the lower end face of the can opening flange 61, as well as the upper end face of the can opening flange 61 and the sealing element 42, are in surface contact and generate axial positive pressure. The static friction force generated by the axial positive pressure restricts the relative rotation between the can opening flange 61 and the threaded buckle 41, and between the can opening flange 61 and the sealing element 42. This ensures that the sealing element 42 only bears a single axial compressive force from the can opening flange 61 during the tightening and sealing stage, and does not bear circumferential shear friction force, thus avoiding wear and fatigue failure of the sealing element 42 due to the superposition of composite stresses.

[0081] Meanwhile, the threaded buckle 41 with the opening 411, under the clamped state, can adapt to the can opening flange 61 with different outer diameters through elastic deformation; when the outer diameter of the can opening flange 61 is too large, the threaded buckle 41 generates a larger elastic expansion, and relies on the elastic recovery force to maintain a stable clamping force on the can opening flange 61; when the outer diameter of the can opening flange 61 is too small, the threaded buckle 41 can still provide an effective clamping force by virtue of the incompletely recovered elastic potential energy, so that the can opening adapter 4 of the same specification can be compatible with a variety of standard tennis cans on the market with outer diameter tolerances ranging from 1mm to 3mm, avoiding the problems of installation difficulties, can opening deformation or clamping failure caused by poor size adaptability of rigid adapters.

[0082] Example 2:

[0083] Example 1 uses a can mouth adapter 4, which consists of a threaded buckle 41 with an opening 411 and a sealing element 42, to achieve stable clamping and end face sealing of tennis balls 6 with different tolerances.

[0084] Furthermore, in the process of pressurizing and holding the tennis ball and depressurizing to retrieve the ball, this embodiment further provides the specific structures of the pressurizing component 2 and the depressurizing component 3.

[0085] like Figure 2 and Figure 3 As shown, the pressurization assembly 2 includes a pressurization button 21, an air pump 22, a one-way air inlet valve 23, and a seal 24.

[0086] The pressurization button 21 is a press-type trigger component, which has a press operation part and a bottom trigger rod. It is installed on the top surface of the upper cover 11. The press operation part protrudes from the top surface of the upper cover 11. The bottom trigger rod contacts the trigger end of the air pump 22 and can make reciprocating linear motion along the axial direction. The air pump 22 can be directly triggered to start and stop by pressing it in the axial direction.

[0087] The air pump 22 is a miniature electric diaphragm pump with a closed pump body shell, an air inlet port, an air outlet port, and a trigger end. The pump body contains a diaphragm, a drive motor, and an eccentric transmission mechanism. It is fixedly installed within the internal cavity defined by the base 12 and the bottom cover 13. The pump body shell is fixedly connected to the base 12 by fasteners. The trigger end is positioned opposite to the bottom trigger rod of the pressurization button 21. The air inlet port communicates with the external atmosphere through an air inlet hole on the housing assembly 1. The air outlet port is connected to the air inlet end of the one-way air inlet valve 23. The air pump 22 is adapted to the volume and pressure holding requirements of the tennis ball tank 6, and can quickly increase the air pressure inside the tank.

[0088] A one-way air intake valve 23 is located in the gas flow path between the outlet port of the air pump 22 and the internal space of the tennis ball can 6. It includes an air intake valve body, an air intake valve core, an air intake spring, and an air intake valve cover. The air intake valve body has a through-flow gas channel. An annular valve seat is located in the middle of the channel, and the sealing surface of the valve seat is an annular plane perpendicular to the channel axis. One end of the air intake valve body is the air intake port, which connects to the outlet port of the air pump 22, and the other end is the air outlet port, which connects to the vent hole of the bottom cover 13. The outer circumferential surface of the air intake valve body is fixedly connected to the base 12. One end of the air intake valve core has a sealing end face adapted to the sealing surface of the valve seat, and the other end has a spring guide post, installed within the internal flow path of the air intake valve body. The sealing end face is opposite to the sealing surface of the valve seat. The air intake spring is a cylindrical helical compression spring, sleeved on the spring guide post of the air intake valve core. One end abuts against the end face of the air intake valve core, and the other end abuts against the inner end face of the air intake valve cover. The intake valve cover is fixed by external thread engaging with the internal thread at the end of the intake valve body, and the central through hole forms part of the gas flow channel. When the air pump 22 is not working, the sealing end face of the intake valve core is tightly fitted with the sealing surface of the annular valve seat, blocking the reverse flow path of gas from the inside of the tennis ball can 6 to the side of the air pump 22; when the air pump 22 is working or the gas pressure on the outlet side exceeds the preload of the intake spring, the gas pushes the intake valve core to move axially along the flow channel, the sealing end face separates from the valve seat, the gas flow channel is opened, and the gas enters the internal space of the tennis ball can 6 through the one-way intake valve 23, realizing one-way gas delivery.

[0089] The sealing element 24 is an elastic sealing sleeve with a continuous hollow inner cavity. The inner diameters of the openings at both ends are adapted to the outer diameters of the air outlet port of the air pump 22 and the air inlet port of the one-way air inlet valve 23, respectively. It is fitted onto the mating point of the air outlet port of the air pump 22 and the air inlet port of the one-way air inlet valve 23. The inner circumferential surfaces at both ends are interference-fitted with the outer circumferential surfaces of the air outlet port of the air pump 22 and the air inlet port of the one-way air inlet valve 23, respectively, covering the mating gap of the two ports. Through its own elastic contraction force, it tightly fits the outer circumferential surfaces of the two mating ports, blocking the leakage path of gas from the port mating gap, ensuring the airtightness during the gas transmission process, and avoiding the decrease in pressure holding efficiency and pressure holding failure caused by gas leakage.

[0090] like Figure 4 and Figure 5 As shown, the pressure relief assembly 3 includes a pressure relief button 31, a one-way exhaust valve 32, and a sealing element 33.

[0091] The pressure relief button 31 is a push-button trigger component, featuring a push-operated surface and a bottom linkage rod. It is mounted on the top surface of the upper cover 11, spaced circumferentially from the pressure button 21 along the top surface of the upper cover 11. The push-operated surface protrudes from the top surface of the upper cover 11, and the bottom linkage rod passes through a second mounting hole on the top surface of the upper cover 11, contacting the exhaust valve stem of the one-way exhaust valve 32, allowing for reciprocating linear motion along the axial direction. The centralized layout of the pressure relief button 31 and the pressure button 21 on the same top surface facilitates one-handed operation for both pressurization and depressurization, eliminating the need to adjust the grip and improving ease of use.

[0092] A one-way vent valve 32 is located in the venting channel between the interior space of the tennis ball tank 6 and the external atmosphere. It includes a vent valve body, a vent valve stem, a vent spring, and a vent latch. The vent valve body has an axially continuous venting channel inside, with one end being an inlet port connected to the vent hole of the bottom cover 13, and the other end being an outlet port connected to the external atmosphere. The outer circumferential surface of the vent valve body is fixedly connected to the base 12. The vent valve stem is arranged along the axis of the venting channel of the vent valve body and installed within the internal venting channel. The vent spring is a cylindrical helical compression spring, sleeved on the outer circumference of the vent valve stem, with one end abutting against the shoulder of the vent valve stem and the other end abutting against the inner end face of the vent valve body. The vent latch is a rotatable locking component, hinged to the upper end of the vent valve body via a pin, with the locking end matching the latch groove of the vent valve stem. When not triggered by external force, the one-way vent valve 32 blocks the connection between the inside of the tennis ball can 6 and the outside atmosphere; when the pressure relief button 31 is pressed, the linkage rod pushes the vent valve rod to overcome the elastic force of the vent spring and move downward along the axis, opening the venting channel and releasing the air pressure inside the tennis ball can 6; the vent lock can rotate and engage with the vent valve rod's lock slot when the vent valve rod is in the open position, locking the vent valve rod in the open position to achieve continuous pressure relief without the user having to continuously press the pressure relief button 31.

[0093] Seal 2 33 is an annular elastic sealing ring, fitted into the outer peripheral groove of the exhaust valve body, and positioned between the mating surfaces of the exhaust valve body and the inner mounting seat of the base 12. Its outer peripheral surface is interference-fitted with the bore wall of the inner mounting seat, and its two sides are pressed tightly against the sidewalls of the groove. Through elastic compression deformation, seal 2 33 fills the annular gap between the mating surfaces of the exhaust valve body and the inner mounting seat, preventing gas leakage from non-designed flow paths outside the venting channel, ensuring that gas is discharged only along the preset venting channel during pressure relief.

[0094] When the pressure cap of the tennis ball can is assembled and sealed, the bottom cover 13, the sealing component 42, the can opening flange 61, the threaded buckle 41 and the tennis ball can 6 together form a sealed cavity. The air outlet of the pressure component 2 and the air inlet of the pressure relief component 3 are both connected to the flow path of the sealed cavity.

[0095] Under pressurization and pressure holding conditions, the user applies pressure to the pressurization button 21 on the top surface of the cover 11. The pressurization button 21 enters the press-triggered state from the free state, and the bottom trigger rod moves downward along the axis, triggering the air pump 22 to enter the working state from the standby state. The air pump 22 draws in gas from the outside atmosphere through the air inlet hole of the housing assembly 1, compresses it through the internal diaphragm mechanism, and discharges it from the outlet port. The high-pressure gas enters the inlet end of the one-way air inlet valve 23 through the mating flow path covered by the seal 24. When the gas pressure exceeds the preload of the air inlet spring, the air inlet valve core overcomes the elastic force of the air inlet spring and enters the open state from the closed state, moves axially along the flow channel, the sealing end face separates from the valve seat, the gas flow channel is opened, and the gas is pumped into the sealed cavity through the one-way air inlet valve 23 and the vent hole of the bottom cover 13, and the gas pressure in the sealed cavity continues to rise. After the user releases the pressurization button 21, the button returns to its free state under the action of the reset spring. The air pump 22 stops working, the air pressure on the outlet side decreases, and the inlet valve core returns to its closed state under the action of the inlet spring. The sealing end face fits tightly with the valve seat, blocking the path of gas backflow from the sealed cavity to the air pump 22 side, and maintaining stable air pressure in the sealed cavity. During this process, the seal 24 is always in an elastically contracted sealing state, covering the gap between the outlet port of the air pump 22 and the inlet port of the one-way inlet valve 23, blocking the gas leakage path at the joint, ensuring that the gas is only delivered unidirectionally along the preset flow path, and avoiding a decrease in pressure holding efficiency and pressure holding failure due to leakage.

[0096] In the pressure relief and ball removal operation, the user applies axial pressure to the pressure relief button 31 on the top surface of the cover 11. The pressure relief button 31 moves from a free state to a pressed trigger state, and the bottom linkage rod moves downward axially, pushing the exhaust valve rod of the one-way exhaust valve 32 to overcome the elastic force of the exhaust spring and move from a closed state to an open state. The venting channel is opened, and the high-pressure gas in the sealed cavity escapes to the outside atmosphere through the venting channel of the one-way exhaust valve 32. The air pressure in the sealed cavity continues to decrease until it is balanced with the external atmospheric pressure. After the user releases the pressure relief button 31, the exhaust valve rod returns to the closed state under the elastic force of the exhaust spring, blocking the venting channel. The pressure relief button 31 simultaneously returns to the free state under the push of the exhaust valve rod. When continuous pressure relief is required, the user can press the pressure relief button 31 to open the exhaust valve rod, rotate the exhaust lock to engage it in the lock slot of the exhaust valve rod, lock the exhaust valve rod in the open state, and achieve continuous pressure relief. After the internal and external air pressures are balanced, the user can screw the housing assembly 1 and the threaded buckle 41 together and separate them. During the ball retrieval process, the tennis ball is taken out from the opening end of the tennis ball can 6 and passes through the petal-shaped structure at the top of the bottom cover 13. The elastic petals of the petal-shaped structure apply a radial contraction force to the passing tennis ball, squeezing it out one by one and preventing multiple tennis balls from coming out at the same time. During this process, the second seal 33 is always in a compressed and sealed state, blocking the non-designed leakage path between the exhaust valve body and the mating surface of the mounting seat inside the base 12, ensuring that the gas is discharged only along the preset venting channel during the depressurization process.

[0097] Example 3:

[0098] Example 2 achieves unidirectional gas delivery through pressurization component 2 and controllable pressure relief through pressure relief component 3.

[0099] Furthermore, under the condition of long-term static storage of tennis balls, the manual pressurization scheme of Example 2 cannot monitor the air pressure status in the sealed cavity in real time. If the air pressure in the sealed cavity decreases due to a slight leak in the air passage and falls below the rated air pressure inside the pressurized tennis ball, the high-pressure gas inside the pressurized tennis ball will continue to escape into the sealed cavity, causing the pressurized tennis ball to lose pressure and lose elasticity, thus failing to meet the usage requirements. At the same time, manual pressurization cannot accurately control the air pressure value in the sealed cavity, which is prone to problems such as insufficient pressurization that fails to form effective pressure maintenance or over-pressurization that exceeds the pressure limit of the tennis ball container 6. Moreover, users need to frequently manually check the air pressure status and repeat pressurization, which is not very convenient to use.

[0100] like Figure 2 As shown, this embodiment further proposes the specific structure of the control unit 5, as well as the cooperative relationship between the control unit 5 and the pressure sensing element and the pressurization assembly 2.

[0101] The control unit 5 is installed in the internal space of the housing assembly 1 and is electrically connected to the pressurization button 21 and the air pump 22 of the pressurization assembly 2. The sensing end is connected to the internal space of the tennis can 6 to provide power supply and real-time air pressure monitoring and pressurization logic control for the pressurization cap of the tennis can.

[0102] The control unit 5 includes a battery 51, a main board 52, a sensor board 53, and a sealing component 54.

[0103] Battery 51 is a rechargeable lithium battery, installed within the internal space enclosed by the top cover 11 and the base 12. It is electrically connected to the main board 52 via wires, forming a closed power supply circuit with the main board 52 and the air pump 22. Battery 51 is adapted to the operating power of the air pump 22 and the standby power consumption of the main board 52, providing a continuous and stable power supply for the tennis ball can pressure cap. The rechargeable structure allows for the repeated use of the tennis ball can pressure cap, reducing the operating cost of the device.

[0104] The motherboard 52 integrates a central processing unit, a power management module, a motor drive module, and a signal processing module, and is mounted on top of the air pump 22. The central processing unit is electrically connected to the bottom trigger lever of the pressurization button 21 and the trigger terminal of the air pump 22, while the power management module is electrically connected to the battery 51. The central processing unit of the motherboard 52 can receive the trigger signal from the pressurization button 21 and the air pressure sensing signal from the sensor board 53, and control the start and stop of the air pump 22 to achieve precise control of the pressurization process and automatic air replenishment during the resting process.

[0105] A sensor board 53 is positioned below the air pump 22 and is equipped with a pressure sensor. The sensing surface of the pressure sensor is located on the lower surface of the board, facing the vent hole of the bottom cover 13. The sensor board 53 is electrically connected to the signal processing module of the main board 52 via a flexible ribbon cable. The sensing surface of the pressure sensor communicates with the internal space of the tennis ball tank 6 through the vent hole on the bottom cover 13. The sensor board 53 is located close to the internal space of the tennis ball tank 6, which shortens the pressure sensing path, reduces the delay and measurement error in the pressure transmission process, and thus accurately senses the pressure changes inside the tennis ball tank 6.

[0106] Seal 454 is an annular elastic sealing gasket, which is fitted onto the pressure sensor.

[0107] After the housing assembly 1 and the can opening adapter 4 are screwed together and sealed, the bottom cover 13, the sealing element 42, the can opening flange 61, the threaded buckle 41 and the tennis ball can 6 together form a sealed cavity. The air pressure sensor of the sensor board 53 is connected to the sealed cavity through the vent hole of the bottom cover 13, and the control unit 5 enters the standby monitoring state.

[0108] In manual pressurization mode, the user presses the pressurization button 21 on the top surface of the cover 11. The pressurization button 21 enters the triggered state from the free state, sending a pressurization start signal to the central processing unit of the main board 52. After receiving the pressurization start signal, the central processing unit of the main board 52 controls the air pump 22 to start, and the air pump 22 enters the working state from the standby state, pumping gas from the outside atmosphere into the sealed cavity through the one-way air intake valve 23. During this process, the air pressure sensor of the sensor board 53 senses the air pressure value in the sealed cavity in real time, converts the air pressure signal into an electrical signal, and transmits it to the central processing unit of the main board 52 through a flexible ribbon cable. The central processing unit of the main board 52 compares the real-time air pressure value with the preset target air pressure value. The preset target air pressure value can be determined based on the rated air pressure inside the pressurized tennis ball to be stored, and the pressurization safety upper limit threshold can be determined based on the maximum allowable working pressure of the commercial tennis ball can used. When the air pressure value sensed by the air pressure sensor on the sensor board 53 reaches the preset target value, the central processing unit of the main board 52 controls the air pump 22 to stop working, and the air intake valve core of the one-way air intake valve 23 is reset to the closed state under the action of the air intake spring, blocking the gas backflow path and maintaining the air pressure stability in the sealed cavity.

[0109] Under long-term static storage conditions, tennis balls will slowly release internal gas, causing the air pressure inside the sealed cavity to gradually decrease. The air pressure sensor on the sensor board 53 captures the changes in air pressure decay inside the sealed cavity in real time and continuously transmits air pressure sensing signals to the central processing unit of the main board 52. When the air pressure value inside the sealed cavity decays to below the preset air replenishment start threshold, the central processing unit of the main board 52 automatically wakes up from the standby monitoring state and controls the air pump 22 to start for short-term air replenishment. Gas enters the sealed cavity through the one-way air inlet valve 23, and the air pressure value inside the sealed cavity gradually rises. The preset air replenishment start threshold is lower than the preset target air pressure value, and the difference can be set according to the detection accuracy of the air pressure sensor and the desired air pressure maintenance accuracy. When the air pressure value sensed by the air pressure sensor on the sensor board 53 recovers to the preset target value, the central processing unit of the main board 52 controls the air pump 22 to stop working and re-enters the standby monitoring state. The air replenishment process is repeated cyclically, so that the air pressure inside the tennis ball tank 6 is always maintained within the preset range.

[0110] In the depressurization and ball retrieval operation, the user presses the depressurization button 31 on the top surface of the cover 11. The depressurization button 31 enters the triggered state from the free state, pushing the one-way exhaust valve 32 from the closed state to the open state. The high-pressure gas in the sealed cavity quickly escapes to the outside atmosphere through the venting channel of the one-way exhaust valve 32. The air pressure sensor on the sensor board 53 senses the air pressure changes in the sealed cavity in real time and transmits the instantaneous large drop signal of the air pressure value to the central processing unit of the motherboard 52. When the air pressure in the sealed cavity drops to balance with the external atmospheric pressure, the central processing unit of the motherboard 52 detects the steady-state change of the air pressure value, automatically enters low-power standby mode from the working state, cuts off the standby power supply circuit of the air pump 22, and reduces the energy consumption of the battery 51. The central processing unit performs corresponding control actions by comparing the air pressure value sensed by the air pressure sensor in real time with the preset target air pressure value or the preset air replenishment start threshold.

[0111] The control unit 5, through real-time monitoring of the air pressure sensor on the sensor board 53 and logic control of the central processing unit on the main board 52, achieves precise control of the air pressure within the sealed cavity, avoiding insufficient or excessive air pressure caused by manual pressurization, and ensuring the stability of the tennis ball pressure storage effect. The automatic air replenishment function with a preset air replenishment threshold solves the problem of air pressure decay caused by tennis ball deflating during long-term static storage, eliminating the need for frequent manual checks of air pressure and repeated pressurization, thus improving the ease of use of the tennis ball can pressure cap. Automatic low-power standby after depressurization effectively reduces the standby power consumption of the tennis ball can pressure cap, extending the single-charge usage time of the battery 51. Simultaneously, the sealing structure of the sealing component 54 ensures the airtightness of the air pressure sensor, preventing gas leakage from affecting the pressure-holding effect, while also preventing humid gas from entering the internal cavity of the housing assembly 1, protecting the internal electronic components, and improving the operational stability and service life of the tennis ball can pressure cap.

[0112] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A pressure cap for tennis ball tanks, used in tennis ball tanks, characterized in that, include: The housing assembly is used to house the internal components and form a connection with the tennis can; A pressurization assembly, installed inside the housing assembly, is used to pump external gas unidirectionally into the internal space of the tennis can and to prevent gas backflow after operation is stopped; A pressure relief assembly, installed on the housing assembly, is used to block the communication between the internal space of the tennis can and the external atmosphere when closed, and to allow the communication between the internal space of the tennis can and the external atmosphere when open. The can opening adapter is an annular component independent of the housing assembly. It is detachably fixed to the flange of the tennis can opening and converts the turning torque into axial thrust when the housing assembly and the can opening adapter are locked together through the connecting structure. This forces the flange of the can opening to press against the seal at the bottom of the housing assembly to form an end face seal.

2. The pressure cap for tennis balls according to claim 1, characterized in that, The can opening adapter includes a threaded snap; the threaded snap is a discontinuous, non-closed annular component with a partial circumferential break to form an opening, the lower part of the inner circumferential surface of the threaded snap has a radially inwardly protruding inner step surface, the top of the threaded snap has an upper end face, and the outer circumferential surface of the threaded snap has an external thread.

3. The pressure cap for tennis balls according to claim 2, characterized in that, The can opening adapter also includes a sealing element three; the sealing element three is an annular elastomer, which is embedded in the annular groove provided on the bottom end face of the housing assembly, and partially protrudes from the bottom end face of the housing assembly in the free state; when the upper end face of the threaded buckle pushes the can opening flange, it forces the upper end face of the can opening flange to press against the sealing element three.

4. The pressure cap for tennis balls according to claim 2, characterized in that, The circumferential notch width of the opening is 0.1 mm to 5 mm, and the radial width of the inner step surface is 0.5 mm to 4 mm.

5. The pressure cap for tennis balls according to claim 2, characterized in that, The housing assembly includes a top cover and a base; the top cover and the base are fixedly connected by fasteners; the inner peripheral wall of the base is formed with internal threads, which engage with the external threads of the threaded fastener.

6. The pressure cap for tennis balls according to claim 5, characterized in that, The pressurization assembly includes a pressurization button, an air pump, a one-way air intake valve, and a sealing element. The pressurization button is installed on the top surface of the upper cover; The air pump is fixedly installed in the cavity of the housing assembly, with its air inlet port communicating with the outside atmosphere and its air outlet port connected to the air inlet end of the one-way air inlet valve. The one-way air inlet valve is located in the gas flow path between the air pump outlet port and the internal space of the tennis can; The sealing element is installed at the junction of the air outlet port of the air pump and the air inlet port of the one-way air inlet valve.

7. The pressure cap for tennis balls according to claim 6, characterized in that, The pressure relief assembly includes a pressure relief button, a one-way exhaust valve, and a second seal. The pressure relief button is installed on the top surface of the upper cover and is arranged circumferentially at intervals from the pressure increase button; The one-way vent valve is located in the venting channel between the interior space of the tennis can and the outside atmosphere. The second sealing element is disposed between the mounting mating surface of the one-way exhaust valve and the base.

8. The pressure cap for a tennis ball can according to claim 7, characterized in that, It also includes a control unit, which is installed inside the housing assembly and includes a battery, a motherboard, a sensor board, and a seal. The battery is electrically connected to the motherboard and supplies power to the air pump and the motherboard; The motherboard integrates a central processing unit, which is electrically connected to the pressurization button, the air pump, and the sensor board. The sensor plate is equipped with a pressure sensor, and the sensing surface of the pressure sensor is connected to the internal space of the tennis can through a vent hole opened in the housing assembly. The four sealing elements are set on the outer periphery of the pressure sensor.

9. The pressure cap for a tennis ball can according to claim 8, characterized in that, The central processing unit is configured to receive the air pressure sensing signal transmitted by the sensor board, and control the air pump to stop when the air pressure value is detected to reach the preset target air pressure value.

10. The pressure cap for a tennis ball can according to claim 9, characterized in that, The central processing unit is configured to automatically wake up and control the air pump to start replenishing air when the air pressure value is detected to have decreased to below the preset air replenishment start threshold, until the air pressure is restored to the preset target value and then stops again.

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