Flush valve

Abstract

The flushing valve comprises a valve body and a pressure sensing assembly, the valve body is provided with a water inlet end, a water outlet end and a water passing cavity communicated with the water inlet end and the water outlet end, one side of the valve body is provided with a pressure sensing channel, the pressure sensing channel is communicated with the water passing cavity, and the pressure sensing assembly comprises a piston rod, an elastic piece and a potentiometer. The piston rod is arranged in the pressure sensing channel and arranged in the axial direction of the pressure sensing channel, the elastic piece provides axial elastic force for the piston rod, the direction of the elastic force is opposite to the water inlet direction of the pressure sensing channel, a movable contact of the potentiometer is connected with the piston rod, and water pressure in the pressure sensing channel can drive the piston rod to overcome the elastic force to push the movable contact. Water enters the pressure sensing channel and pushes the piston rod, the piston rod compresses the spring and pushes the potentiometer, the resistance voltage of the potentiometer generates related changes, and water pressure detection is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flushing valve technical field, in particular to a flushing valve BACKGROUND

[0002] At present, some flushing valves are matched with pressure sensors to detect water pressure, and the following problems exist: (1) the pressure sensors on the market are high in cost, and the purchased sensors can significantly increase the manufacturing cost. (2) The water pressure sensors sold on the market have poor matching with the flushing valves, and often cannot be directly matched, for example, the range, accuracy, response time and other parameters of the purchased water pressure sensor may not meet the requirements of the bathroom equipment; the installation mode of the sensor may not match the application scene; the output signal (such as voltage, current, digital signal, etc.) of the sensor may not be compatible with the interface of the self-control system of the flushing valve; the existing water pressure sensor usually outputs a standardized signal, and an additional analog-digital conversion or signal conditioning circuit is required, which increases the adaptation cost and delay; therefore, the purchased water pressure sensor needs to spend a lot of manpower, material resources and time on selection and adjustment. SUMMARY

[0003] The utility model aims at at least in a certain extent solves one of the foregoing technical problems in the related art. To this end, the utility model provides a flushing valve.

[0004] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0005] According to the flushing valve of the utility model embodiment, the valve body has a water inlet end, a water outlet end and a water passing cavity communicating the water inlet end and the water outlet end, one side of the valve body is provided with a pressure sensing channel, the pressure sensing channel communicates with the water inlet end, the pressure sensing assembly includes a piston rod, an elastic member and a potentiometer, the piston rod is placed in the pressure sensing channel and is arranged along the axial direction of the pressure sensing channel, the elastic member provides the piston rod with an axial elastic force, the direction of the elastic force is opposite to the water inlet direction of the pressure sensing channel, the moving contact of the potentiometer is connected with the piston rod, and the water pressure in the pressure sensing channel can drive the piston rod to push the moving contact against the elastic force.

[0006] According to the flushing valve of the utility model embodiment, at least the following beneficial effects are obtained:

[0007] 1、The pressure sensing assembly of the utility model is simple in structure and is composed of three core components of a piston rod, an elastic member and a potentiometer, is mechanically linked and integrated, has no complex transmission mechanism, realizes direct conversion of pressure→displacement→resistance, integrates pressure sensing and electric signal conversion, saves the signal conditioning circuit required by the traditional pressure sensor, and can also save the procurement cost of the independent sensor.

[0008] 2. The movement direction and stroke range of the piston rod are matched with the pressure change of the water inlet end of the valve body, and the elastic force parameters (such as spring stiffness and pre-compression amount) of the elastic member can be customized according to the working pressure range of the valve body, so as to ensure the linearity and sensitivity of the pressure-displacement conversion.

[0009] 3. The moving contact of the potentiometer is rigidly connected with the piston rod, and the water pressure change is directly converted into the linear change of the resistance value (or voltage), so that the output signal can be directly connected to the electric control system of the flushing valve, without the need of additional analog-digital conversion or signal conditioning circuit, thereby reducing the adaptation cost and improving the response speed.

[0010] 4. The elastic member provides a reverse elastic force to form a dynamic balance with the water pressure. When the water pressure changes, the piston rod automatically adjusts the position, outputs a corresponding electric signal through the potentiometer, and can be linked to the opening degree adjustment of the flushing valve (such as automatically adjusting the water flow size or opening time), so as to realize the energy-saving and water-saving or constant pressure water supply function, and is especially suitable for areas with unstable water pressure.

[0011] According to some embodiments of the present application, the water inlet end and the water outlet end are located on the same axis, and the angle β between the axis of the pressure sensing channel and the water outlet direction of the valve body is ≤45°.

[0012] According to some embodiments of the present application, the pressure sensing assembly further comprises a shell, the shape of the shell is matched with the inner wall of the pressure sensing channel, the shell is embedded in the pressure sensing channel, a water inlet channel and a piston cavity are formed in the shell and are connected, the water inlet channel is communicated with the pressure sensing channel, the inner diameter of the piston cavity is larger than that of the water inlet channel, and the piston rod is arranged in the piston cavity.

[0013] According to some embodiments of the present application, the shell comprises a first shell and a second shell, the water inlet channel is arranged on the first shell, the front half of the piston cavity is arranged on the first shell, and the rear half is arranged on the second shell, the rear end of the first shell is butted with the front end of the second shell to form a complete piston cavity, the outer peripheral wall of the first shell is matched with the inner peripheral wall of the pressure sensing channel, the first shell is embedded in the pressure sensing channel, the second shell is detachably mounted outside the pressure sensing channel, and the potentiometer is mounted on the second shell.

[0014] According to some embodiments of the utility model, the front end of the second shell outer wall is equipped with a first protruding block, the rear end of the pressure sensing channel is equipped with a mounting cavity, the rear end of the mounting cavity inner wall is equipped with a second protruding block, the second protruding block and the front end of the mounting cavity form an annular space for the circumferential movement of the first protruding block, the second shell can be inserted into the mounting cavity and rotated from a first position to a second position, when in the first position, the first protruding block and the second protruding block are axially misaligned with each other, and the first protruding block is located in the annular space, when in the second position, the first protruding block and the second protruding block are axially aligned with each other.

[0015] According to some embodiments of the utility model, the first protruding block is an L-shaped structure composed of a sliding block part and a limiting part, the sliding block part is arranged along the circumference of the second shell, the limiting part is arranged along the axis of the second shell, and the limiting part is connected to the rear side of the sliding block part, when in the second position, the sliding block part and the second protruding block are axially aligned with each other, and the limiting part and the second protruding block are circumferentially abutted.

[0016] According to some embodiments of the utility model, the pressure sensing assembly further comprises a limiting snap spring, the limiting snap spring is clamped between the first shell and the second shell, the front end of the piston rod is equipped with a flange, the elastic member is a spring, the spring is sleeved on the piston rod, and the spring is abutted between the flange and the limiting snap spring.

[0017] According to some embodiments of the utility model, the outside of the second shell is equipped with a containing cavity, the bottom of the containing cavity is provided with a strip-shaped hole communicating with the piston cavity, the strip-shaped hole is arranged along the axis of the second shell, the potentiometer is installed in the containing cavity, and the moving contact is connected with the piston rod by extending into the piston cavity through the strip-shaped hole, and the moving contact can move in the strip-shaped hole.

[0018] According to some embodiments of the utility model, the front end of the piston rod is sleeved with a first sealing ring, the first sealing ring is abutted between the piston rod and the piston cavity inner wall, and the outer wall of the water inlet channel is sleeved with a second sealing ring, and the second sealing ring is abutted between the water inlet channel outer wall and the pressure sensing channel inner wall.

[0019] According to some embodiments of the utility model, further comprising a solenoid valve and a control circuit board, the solenoid valve is used for controlling the on-off of the water passing cavity, and the control circuit board is electrically connected with the solenoid valve and the potentiometer.

[0020] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be known by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present utility model will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the references to the following drawings of which:

[0022] Figure 1 is the overall structure schematic diagram of the flush valve of the present utility model;

[0023] Figure 2 is the structure schematic diagram of the pressure sensing assembly of the present utility model;

[0024] Figure 3 is the sectional view of the flush valve of the present utility model;

[0025] Figure 4 is the structure schematic diagram of the second shell of the present utility model;

[0026] Figure 5 is the structure schematic diagram of the mounting cavity of the present utility model;

[0027] Figure 6 is Figure 3 the sectional view of A-A in Fig. 1;

[0028] Figure 7 is the sectional view of the valve body of the present utility model.

[0029] Reference signs: valve body 100, water inlet end 110, water outlet end 120, water passing cavity 130, pressure sensing channel 140, mounting cavity 150, second protruding block 151, pressure sensing assembly 200, piston rod 210, flange 211, elastic member 220, potentiometer 230, movable contact 231, shell 240, piston cavity 241, water inlet channel 242, first shell 243, second shell 244, first protruding block 245, sliding block part 246, limiting part 247, accommodating cavity 248, strip-shaped hole 249, limiting snap spring 250, first sealing ring 260, second sealing ring 270, cover 280. DETAILED DESCRIPTION

[0030] The embodiments of the present utility model will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, and cannot be understood as a limitation of the present utility model.

[0031] In the description of the utility model, it is understood that the terms "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0032] Referring to Figures 1-7 A flush valve, comprising a valve body 100 and a pressure sensing assembly 200, the valve body 100 has a water inlet end 110, a water outlet end 120 and a water passing cavity 130 communicating the water inlet end 110 and the water outlet end 120, one side of the valve body 100 is provided with a pressure sensing channel 140, the pressure sensing channel 140 communicates with the water inlet end 110, the pressure sensing assembly 200 comprises a piston rod 210, an elastic member 220 and a potentiometer 230, the piston rod 210 is placed in the pressure sensing channel 140 and is arranged along the axial direction of the pressure sensing channel 140, the elastic member 220 provides the piston rod 210 with an axial elastic force, the direction of the elastic force is opposite to the water inlet direction of the pressure sensing channel 140, the moving contact 231 of the potentiometer 230 is connected with the piston rod 210, and the water pressure in the pressure sensing channel 140 can drive the piston rod 210 to push the moving contact 231 against the elastic force.

[0033] Working principle: water enters the pressure sensing channel 140 and pushes the piston rod 210, the piston rod 210 compresses the spring and pushes the potentiometer 230, at this time, the resistance voltage of the potentiometer 230 produces relevant changes, realizing water pressure detection. The spring can be set to remain stationary when the water pressure is ≤0.3MPa, and the piston rod 210 compresses the spring and pushes the potentiometer 230 when the water pressure is >0.3MPa, and the potentiometer 230 resets under the spring elastic force when the water pressure decreases.

[0034] In some embodiments of the utility model, as Figure 7 The water inlet end 110 and the water outlet end 120 are located on the same axis, and the angle β between the axis of the pressure sensing channel 140 and the water outlet direction of the valve body 100 is ≤45°. Smaller angle can ensure that the water flow pressure acts more directly on the axial direction of the piston rod 210, reducing the pressure loss or energy dispersion caused by the deviation of the water flow direction. When the water pressure changes, the piston rod 210 can respond more sensitively, push the moving contact 231 of the potentiometer 230, and accurately feedback the current water pressure value.

[0035] In some embodiments of this utility model, the pressure sensing component 200 further includes a housing 240. The shape of the housing 240 is adapted to the inner wall of the pressure sensing channel 140. The housing 240 is embedded in the pressure sensing channel 140. A water inlet channel 242 and a piston chamber 241 are formed inside the housing 240. The water inlet channel 242 communicates with the pressure sensing channel 140. The inner diameter of the piston chamber 241 is larger than the inner diameter of the water inlet channel 242. The piston rod 210 is placed inside the piston chamber 241. The housing 240 serves as a carrier, integrating components such as the piston rod 210, the elastic element 220, and the potentiometer 230 within the housing 240. This makes the pressure sensing component 200 an independent module embedded in the valve body 100, facilitating assembly during production and simplifying the replacement process during maintenance.

[0036] In some embodiments of this utility model, the outer casing 240 includes a first casing 243 and a second casing 244. A water inlet channel 242 is disposed on the first casing 243. The front half of the piston chamber 241 is disposed on the first casing 243, and the rear half is disposed on the second casing 244. The rear end of the first casing 243 is connected to the front end of the second casing 244 to form a complete piston chamber 241. The outer peripheral wall of the first casing 243 is adapted to the inner peripheral wall of the pressure sensing channel 140. The first casing 243 is embedded in the pressure sensing channel 140, and the second casing 244 is detachably installed outside the pressure sensing channel 140. The potentiometer 230 is installed on the second casing 244. The split design of the outer casing 240 makes the installation of each component more convenient. For example, the piston rod 210 can be first installed in the front half of the piston chamber 241 of the first casing 243, and then the second casing 244 is connected to the first casing 243 to complete the assembly of the entire pressure sensing assembly 200. The second housing 244 is detachably installed outside the pressure sensing channel 140. When components such as the potentiometer 230 malfunction, the second housing 244 can be directly disassembled for repair or replacement without disassembling the entire flushing valve, thus reducing maintenance time and costs.

[0037] In some embodiments of this utility model, such as Figures 4-6As shown, the front end of the outer wall of the second shell 244 is provided with a first protrusion 245, the rear end of the pressure sensing channel 140 is provided with a mounting cavity 150, the rear end of the inner wall of the mounting cavity 150 is provided with a second protrusion 151, the second protrusion 151 and the front end of the mounting cavity 150 form an annular space for the circumferential movement of the first protrusion 245, the second shell 244 can be inserted into the mounting cavity 150 and rotated from a first position to a second position, in the first position, the first protrusion 245 and the second protrusion 151 are axially misaligned with each other, and the first protrusion 245 is located in the annular space, in the second position, the first protrusion 245 and the second protrusion 151 are axially aligned with each other. Further, the inner diameter of the mounting cavity 150 is larger than the inner diameter of the pressure sensing channel 140, and the annular space allows the first protrusion 245 to move (i.e., rotate) in the circumferential range, but limits its axial displacement. The second shell 244 is in an unlocked state in the first position, and the second shell 244 can be freely inserted or withdrawn from the mounting cavity 150; in the second position, it is in a locked state, after rotating to the protrusion alignment, the two protrusions form an axial block, preventing the second shell 244 from moving axially, thereby realizing the function of "rotating to lock", and when maintaining, the second shell 244 only needs to be rotated to the first position (protrusion misalignment) to be easily pulled out. The second shell 244 and the valve body 100 are connected and fixed in a screwing manner, which saves time and effort in disassembly, maintenance.

[0038] In some embodiments of the utility model, the first protrusion 245 is an L-shaped structure composed of a sliding block part 246 and a limiting part 247, the sliding block part 246 is arranged along the circumference of the second shell 244, the limiting part 247 is arranged along the axis of the second shell 244, and the limiting part 247 is connected to the rear side of the sliding block part 246, in the second position, the sliding block part 246 and the second protrusion 151 are axially aligned with each other, and the limiting part 247 abuts against the second protrusion 151 in the circumferential direction. The limiting part 247 abuts against the second protrusion 151 in the circumferential direction, limiting the rotational freedom of the second shell 244, and ensuring that it is rotated to the right position.

[0039] In some embodiments of the utility model, the pressure sensing assembly 200 further comprises a limiting snap spring 250, the limiting snap spring 250 is clamped between the first shell 243 and the second shell 244, the front end of the piston rod 210 is provided with a flange 211, the elastic member 220 is a spring, the spring is sleeved on the piston rod 210, and the spring abuts against between the flange 211 and the limiting snap spring 250. This structure makes the piston rod 210 maintain a preset thrust when not subjected to water pressure, ensuring that the piston rod 210 does not move under a set low water pressure.

[0040] In some embodiments of the utility model, the outer side of second shell 244 is equipped with accommodating cavity 248, the bottom of accommodating cavity 248 is opened with strip hole 249 communicating piston cavity 241, potentiometer 230 is installed in accommodating cavity 248, and movable contact 231 extends into piston cavity 241 through strip hole 249 and is connected with piston rod 210, and movable contact 231 can move in strip hole 249. Further, the top of accommodating cavity 248 is sealed by cover 280. Accommodating cavity 248 independently encapsulates potentiometer 230 outside second shell 244, avoids its direct exposure to the water environment of pressure sensing channel 140, and prevents circuit failure caused by water vapor penetration.

[0041] In some embodiments of the utility model, the front end of piston rod 210 is sleeved with first sealing ring 260, first sealing ring 260 is abutted between piston rod 210 and the inner wall of piston cavity 241, and the outer wall of water inlet channel 242 is sleeved with second sealing ring 270, and second sealing ring 270 is abutted between the outer wall of water inlet channel 242 and the inner wall of pressure sensing channel 140. First sealing ring 260 and second sealing ring 270 bear the key sealing and protection functions in pressure sensing assembly 200. When water pressure acts on piston cavity 241, first sealing ring 260 forms a dynamic sealing barrier between piston rod 210 and the inner wall of piston cavity 241, prevents water from leaking to potentiometer 230 accommodating cavity 248 or other non-pressure-bearing areas along the axial gap of piston rod 210, and avoids 260 circuit short circuit or mechanical corrosion. First sealing ring 260 needs to have high elasticity and wear resistance, keeps good adhesion when piston rod 210 reciprocates, and reduces friction loss. Second sealing ring 270 can compensate the assembly tolerance of first shell 243 and pressure sensing channel 140, and prevent water from leaking through the gap between first shell 243 and pressure sensing channel 140.

[0042] In some embodiments of the utility model, further include solenoid valve and control circuit board, solenoid valve is used for controlling the on-off of water passing cavity 130, and control circuit board is electrically connected with solenoid valve and potentiometer 230. Potentiometer 230 can link the opening degree adjustment (such as automatic adjustment of water flow size or opening time length) or overpressure protection (such as water pressure reaches a certain value and automatically opens solenoid valve to release pressure) of the solenoid valve of flush valve, realizes energy-saving and water-saving or constant pressure water supply function.

[0043] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and its equivalents.

Claims

1. A flush valve characterized by, The valve body (100) has a water inlet end (110), a water outlet end (120) and a water passing cavity (130) connecting the water inlet end (110) and the water outlet end (120), and a pressure sensing channel (140) is arranged on one side of the valve body (100) and communicates with the water inlet end (110), the pressure sensing assembly (200) comprises a piston rod (210), an elastic member (220) and a potentiometer (230), the piston rod (210) is arranged in the pressure sensing channel (140) and is arranged along the axial direction of the pressure sensing channel (140), the elastic member (220) provides an axial elastic force for the piston rod (210), the direction of the elastic force is opposite to the water inlet direction of the pressure sensing channel (140), and the moving contact (231) of the potentiometer (230) is connected with the piston rod (210), and the water pressure in the pressure sensing channel (140) can drive the piston rod (210) to push the moving contact (231) against the elastic force.

2. The flush valve according to claim 1, wherein The water inlet end (110) and the water outlet end (120) are located on the same axis, and the angle β between the axis of the pressure sensing channel (140) and the water outlet direction of the valve body (100) is less than or equal to 45°.

3. The flush valve of claim 1, wherein The pressure sensing assembly (200) further comprises a shell (240), the shape of the shell (240) is matched with the inner wall of the pressure sensing channel (140), the shell (240) is embedded in the pressure sensing channel (140), and a water inlet channel (242) and a piston cavity (241) are formed in the shell (240) and are connected, the water inlet channel (242) communicates with the pressure sensing channel (140), the inner diameter of the piston cavity (241) is greater than that of the water inlet channel (242), and the piston rod (210) is arranged in the piston cavity (241).

4. The flush valve of claim 3, wherein The shell (240) comprises a first shell (243) and a second shell (244), the water inlet channel (242) is arranged on the first shell (243), the front half of the piston cavity (241) is arranged on the first shell (243), and the rear half of the piston cavity (241) is arranged on the second shell (244), the rear end of the first shell (243) is butted with the front end of the second shell (244) to form a complete piston cavity (241), the outer peripheral wall of the first shell (243) is matched with the inner peripheral wall of the pressure sensing channel (140), the first shell (243) is embedded in the pressure sensing channel (140), the second shell (244) is detachably arranged outside the pressure sensing channel (140), and the potentiometer (230) is arranged on the second shell (244).

5. The flush valve of claim 4, wherein The front end of the outer wall of the second shell (244) is provided with a first protrusion (245), the rear end of the pressure sensing channel (140) is provided with a mounting cavity (150), the rear end of the inner wall of the mounting cavity (150) is provided with a second protrusion (151), the second protrusion (151) and the front end of the mounting cavity (150) form an annular space for the circumferential movement of the first protrusion (245), the second shell (244) can be inserted into the mounting cavity (150) and rotated from a first position to a second position, in the first position, the first protrusion (245) and the second protrusion (151) are axially misaligned with each other, and the first protrusion (245) is located in the annular space, in the second position, the first protrusion (245) and the second protrusion (151) are axially aligned with each other.

6. The flush valve of claim 5, wherein The first protrusion (245) is an L-shaped structure composed of a slider part (246) and a limiting part (247), the slider part (246) is arranged along the circumference of the second shell (244), the limiting part (247) is arranged along the axis of the second shell (244), and the limiting part (247) is connected to the rear side of the slider part (246), in the second position, the slider part (246) and the second protrusion (151) are axially aligned with each other, and the limiting part (247) and the second protrusion (151) are circumferentially abutted.

7. The flush valve of claim 4 wherein, The pressure sensing assembly (200) further comprises a limiting snap spring (250), the limiting snap spring (250) is clamped between the first shell (243) and the second shell (244), the front end of the piston rod (210) is provided with a flange (211), the elastic member (220) is a spring, the spring is sleeved on the piston rod (210), and the spring abuts between the flange (211) and the limiting snap spring (250).

8. The flush valve of claim 4 wherein, The outer side of the second shell (244) is provided with a containing cavity (248), the bottom of the containing cavity (248) is provided with a strip-shaped hole (249) communicating with the piston cavity (241), the strip-shaped hole (249) is arranged along the axis of the second shell (244), the potentiometer (230) is installed in the containing cavity (248), and the movable contact (231) extends into the piston cavity (241) through the strip-shaped hole (249) and is connected with the piston rod (210), the movable contact (231) can move in the strip-shaped hole (249).

9. The flush valve of claim 3 wherein, The front end of the piston rod (210) is sleeved with a first sealing ring (260), the first sealing ring (260) abuts between the piston rod (210) and the inner wall of the piston cavity (241), the outer wall of the water inlet channel (242) is sleeved with a second sealing ring (270), and the second sealing ring (270) abuts between the outer wall of the water inlet channel (242) and the inner wall of the pressure sensing channel (140).

10. The flush valve of claim 1, wherein Further comprising a solenoid valve and a control circuit board, the solenoid valve is used for controlling the on-off of the water passing cavity (130), and the control circuit board is electrically connected with the solenoid valve and the potentiometer.

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