Flush valve

Abstract

The utility model discloses a flush valve which comprises a valve body and a pressure sensing assembly, a pressure sensing channel is arranged on one side of the valve body, the pressure sensing assembly comprises a piston rod and a force sensing assembly, the force sensing assembly comprises a force sensing element, the force sensing element is a strain gauge or a flexible pressure film, and the piston rod is arranged in the pressure sensing channel. Water pressure in the pressure sensing channel can push the piston rod to act on the force sensing assembly so as to trigger the force sensing element. Water enters the pressure sensing channel and pushes the piston rod, and the piston rod acts on the force sensing component, so that the force sensing component is strained to cause corresponding electric signal change, and the current water pressure is reflected. The measuring precision of the force-sensitive element is extremely high, and the fine change of the water pressure in the pipeline can be accurately controlled by measuring the water pressure change through the force-sensitive element, so that more accurate regulation and control are realized.

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 valve, 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 flushing valve self-control system, the existing water pressure sensor usually outputs standardized signal, and additional analog-digital conversion or signal conditioning circuit is needed, 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.

[0004] To achieve the above 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 and a force sensing assembly, the force sensing assembly includes a force sensing element, the force sensing element is a strain gauge or a flexible pressure film, the piston rod is arranged in the pressure sensing channel and is arranged along the axial direction of the pressure sensing channel, and the water pressure in the pressure sensing channel can drive the piston rod to act on the force sensing assembly to trigger the force sensing element.

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

[0007] 1. Water enters the pressure sensing channel and pushes the piston rod. The piston rod acts on the force-sensitive component, causing strain on the force-sensitive element and resulting in corresponding changes in electrical signals (such as changes in resistance and voltage), thus reflecting the current water pressure. The force-sensitive element has extremely high measurement accuracy. By measuring water pressure changes through the force-sensitive element, subtle changes in water pressure within the pipeline can be precisely controlled, thereby achieving more precise regulation. Furthermore, this invention uses a piston rod as the water pressure transmission component. Its contact area with the force-sensitive element is small. Compared to the force-sensitive element being in full contact with the water flow, the deformation of the force-sensitive element caused by the piston rod is more pronounced, allowing for accurate measurement of water pressure changes and precise regulation.

[0008] 2. The pressure sensing component of this utility model has a simple structure, mainly consisting of two core components: a piston rod and a force-sensitive element. It is mechanically linked and integrated without a complex transmission mechanism, realizing direct conversion of pressure to resistance / voltage. The pressure sensing and electrical signal conversion are integrated, eliminating the signal conditioning circuit required by traditional pressure sensors and saving the procurement cost of independent sensors.

[0009] According to some embodiments of this utility model, the inlet end and the outlet end are located on the same axis, and the angle β between the axis of the pressure sensing channel and the outlet direction of the valve body is ≤45°.

[0010] According to some embodiments of the present invention, the pressure sensing component further includes a housing, the shape of which is adapted to the inner wall of the pressure sensing channel, the housing being embedded in the pressure sensing channel, and a connected water inlet channel and a piston chamber being formed inside the housing, the water inlet channel being connected to the pressure sensing channel, the inner diameter of the piston chamber being larger than the inner diameter of the water inlet channel, and the piston rod being placed inside the piston chamber.

[0011] According to some embodiments of this utility model, the outer wall of the housing is provided with a first protrusion, the rear end of the pressure sensing channel is provided with a mounting cavity, the rear end of the inner wall of the mounting cavity is provided with a second protrusion, and an annular space is formed between the second protrusion and the front end of the mounting cavity, allowing the first protrusion to move circumferentially. After the housing is inserted into the pressure sensing channel, it has an unlocked state and a locked state. In the unlocked state, the first protrusion and the second protrusion are axially misaligned and the first protrusion is located in the annular space. In the locked state, the first protrusion and the second protrusion are axially aligned. The unlocked state and the locked state can be switched by rotating the housing.

[0012] According to some embodiments of the utility model, the first protruding block is L-shaped structure which is composed of a sliding block part and a limiting part, the sliding block part is arranged along the circumference of the shell, the limiting part is arranged along the axial direction of the shell, and the limiting part is connected to the rear side of the sliding block part, in the locking state, 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 in abutment in the circumferential direction.

[0013] According to some embodiments of the utility model, when the force sensing element is a strain gauge, the force sensing assembly further comprises a first steel sheet and a first cover, the first cover is installed at the rear end of the shell, the first steel sheet is clamped between the shell and the first cover, the strain gauge is attached to the first steel sheet, and the water pressure in the pressure sensing channel can push the piston rod to contact and press the first steel sheet, so that the first steel sheet is strained.

[0014] According to some embodiments of the utility model, when the force sensing element is a flexible pressure film, the force sensing assembly further comprises a second steel sheet, a second cover and a rubber pad, the second cover is installed at the rear end of the shell, the second cover is formed with a receiving cavity with an opening facing the pressure sensing channel, the flexible pressure film is attached to the bottom wall of the receiving cavity, the second steel sheet and the rubber pad are embedded in the receiving cavity, and the rubber pad is clamped between the second steel sheet and the flexible pressure film, and the water pressure in the pressure sensing channel can push the piston rod to contact and press the second steel sheet, so that the flexible pressure film is synchronously pressed.

[0015] According to some embodiments of the utility model, the front end of the piston rod is provided with a sealing plug, the sealing plug is formed with a concave arc surface, and the concave arc surface faces the water inlet channel.

[0016] According to some embodiments of the utility model, a sealing ring is arranged between the shell and the pressure sensing channel.

[0017] According to some embodiments of the utility model, an electromagnetic valve and a control circuit board are further included, the electromagnetic valve is used for controlling the on-off of the water passing cavity, and the control circuit board is electrically connected with the electromagnetic valve and the force sensing element.

[0018] The 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

[0019] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0020] Figure 1It is the whole structure schematic view of the flush valve of the utility model;

[0021] Figure 2 It is the structure schematic view of the pressure sensing assembly of the first embodiment of the utility model;

[0022] Figure 3 It is the section view of the first embodiment of the utility model;

[0023] Figure 4 It is the structure schematic view of the installation cavity of the utility model;

[0024] Figure 5 It is Figure 3 The section view at A-A in Fig.

[0025] Figure 6 It is the section view of the pressure sensing assembly of the second embodiment of the utility model;

[0026] Figure 7 It is the explosion view of the pressure sensing assembly of the second embodiment of the utility model;

[0027] Figure 8 It is the section view of the valve body of the utility model.

[0028] Reference signs: valve body 100, water inlet end 110, water outlet end 120, water passing cavity 130, pressure sensing channel 140, installation cavity 150, second protruding block 151, pressure sensing assembly 200, piston rod 210, sealing plug 211, strain gauge 220, first steel sheet 221, first cover 222, bolt 223, flexible pressure diaphragm 230, second steel sheet 231, second cover 232, rubber pad 233, containing cavity 234, shell 240, water inlet channel 241, piston cavity 242, first protruding block 243, sliding block part 244, limiting part 245, sealing ring 250. DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, the examples of the embodiments 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 utility model, and cannot be understood as the limitation of the utility model.

[0030] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "front", "back" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation of the utility model.

[0031] Referring to Figures 1-8 A flush valve comprises 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 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, the pressure sensing channel 140 is communicated with the water inlet end 110, the pressure sensing assembly 200 comprises a piston rod 210 and a force sensing assembly, the force sensing assembly comprises a force sensing element, the force sensing element is a strain gauge 220 or a flexible pressure diaphragm 230, the piston rod 210 is arranged in the pressure sensing channel 140 and arranged along the axial direction of the pressure sensing channel 140, and the water pressure in the pressure sensing channel 140 can drive the piston rod 210 to act on the force sensing assembly to trigger the force sensing element. Wherein, the piston rod 210 can directly or indirectly act on the flexible pressure diaphragm 230, and the flexible pressure diaphragm 230 is a flexible film piezoelectric sheet or a flexible film piezoresistive sheet.

[0032] In some embodiments of the utility model, as Figure 8 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 degrees. 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.

[0033] In some embodiments of the utility model, 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 the water inlet channel 241 and the piston cavity 242 are formed in the shell 240 and communicated, the water inlet channel 241 is communicated with the pressure sensing channel 140, the inner diameter of the piston cavity 242 is greater than that of the water inlet channel 241, and the piston rod 210 is arranged in the piston cavity 242. The shell 240 is used as a carrier to integrate the piston rod 210 and the force sensing assembly in the shell 240, so that the pressure sensing assembly 200 becomes an independent module embedded in the valve body 100, facilitating assembly during production and simplifying the replacement process during maintenance.

[0034] In some embodiments of the utility model, the outer wall of shell 240 is provided with first protrusion 243, the rear end of pressure sensing channel 140 is provided with mounting cavity 150, the rear end of the inner wall of mounting cavity 150 is provided with second protrusion 151, the annular space that can be used for the circumferential movement of first protrusion 243 is formed between second protrusion 151 and the front end of mounting cavity 150, after shell 240 is inserted into pressure sensing channel 140, there are unlocking state and locking state, in unlocking state, first protrusion 243 and second protrusion 151 are mutually staggered in axial direction, and first protrusion 243 is located in annular space, in locking state, first protrusion 243 and second protrusion 151 are mutually aligned in axial direction, and the unlocking state and locking state are switched by rotating shell 240. Further, the inner diameter of mounting cavity 150 is greater than the inner diameter of pressure sensing channel 140, and annular space allows first protrusion 243 to move (i.e. rotate) in circumferential range, but limits its axial displacement. In unlocking state, shell 240 can be freely inserted or withdrawn from mounting cavity 150, in locking state, after shell 240 is rotated to the alignment of first protrusion 243 and second protrusion 151, the two protrusions form a block in axial direction, prevent shell 240 from moving along axial direction, so that the function of "rotating to lock" is realized, when maintaining, shell 240 can be easily pulled out by rotating to the stagger of two protrusions, and disassembly is convenient.

[0035] In some embodiments of the utility model, first protrusion 243 is L-shaped structure composed of slider part 244 and limiting part 245, slider part 244 is arranged along the circumference of shell 240, limiting part 245 is arranged along the axial direction of shell 240, and limiting part 245 is connected to the rear side of slider part 244, in locking state, slider part 244 and second protrusion 151 are mutually aligned in axial direction, and limiting part 245 and second protrusion 151 abut in circumferential direction. Limiting part 245 and second protrusion 151 abut in circumferential direction, limit the rotation freedom degree of shell 240, and ensure that rotation is in place.

[0036] In some embodiments of the utility model, refer to Figures 2-3When the force sensing element is the strain gauge 220, the force sensing assembly further comprises a first steel sheet 221 and a first cover 222, the first cover 222 is installed at the rear end of the shell 240, the first steel sheet 221 is clamped between the shell 240 and the first cover 222, and the strain gauge 220 is attached to the first steel sheet 221, the water pressure in the pressure sensing channel 140 can push the piston rod 210 to contact and extrude the first steel sheet 221, so that the first steel sheet 221 is strained. Further, the first cover 222 and the shell 240 are fixed through the bolt 223, and the first cover 222 is provided with a wire outlet to supply the electric wire of the strain gauge 220. The strain gauge 220 is attached to the steel sheet, and the steel sheet will be strained in microcosm after being subjected to pressure, and the strain gauge 220 measures the strain generated on the surface of the steel sheet after being subjected to force. The water enters the piston cavity 242 from the water inlet channel 241, pushes the piston rod 210, and the piston rod 210 pushes the steel sheet to be strained, at this time, the strain generated on the steel sheet makes the metal resistance material on the strain gauge 220 be synchronously stretched or compressed, the length and cross-sectional area of the metal resistance material change, so that the resistance value of the metal resistance material increases or decreases. When the pressure disappears or decreases, the toughness of the steel sheet makes the strain of the steel sheet also decrease synchronously, and the steel sheet is subjected to simulation calculation, so that the steel sheet will not be permanently deformed within a certain pressure range.

[0037] In some embodiments of the utility model, refer to Figures 6-7When the force sensing element is the flexible pressure film 230, the force sensing assembly further comprises a second steel sheet 231, a second cover 232 and a rubber pad 233. The second cover 232 is mounted on the rear end of the shell 240, and a receiving cavity 234 is formed in the second cover 232 and faces the pressure sensing channel 140. The flexible pressure film 230 is attached to the bottom wall of the receiving cavity 234. The second steel sheet 231 and the rubber pad 233 are embedded in the receiving cavity 234, and the rubber pad 233 is clamped between the second steel sheet 231 and the flexible pressure film 230. The water pressure in the pressure sensing channel 140 can push the piston rod 210 to contact and press the second steel sheet 231, so that the flexible pressure film 230 is synchronously pressed. The second cover 232 is fixed on the shell 240 by screws. The flexible pressure film 230 is mainly made of flexible material and deforms under pressure and restores when the pressure disappears. The piston rod 210 contacts the second steel sheet 231, and the water pressure is transmitted to the surface of the flexible pressure film 230. According to the specific type of the flexible pressure film 230, a corresponding electrical signal change is generated. For example, the flexible film piezoelectric sheet generates a current change based on the piezoelectric effect under pressure, and the flexible film piezoresistor generates a resistance value change based on the piezoresistive effect under pressure. The rubber pad 233 is used for buffering and resetting to avoid the piston rod 210 still pressing the flexible pressure film 230 after the water pressure disappears, which reduces the accuracy of the flexible pressure film 230. The second steel sheet 231 makes the force of the rubber pad 233 uniform. Because the cross-sectional area of the piston rod 210 is small, if the rubber pad 233 is directly acted on by the piston rod 210, the force area of the rubber pad 233 is small, and the pressure is large. Adding the second steel sheet 231 between the rubber pad 233 and the piston rod 210 can avoid the problem of local permanent deformation of the rubber pad 233 under long-term pressure.

[0038] In some embodiments of the utility model, the front end of piston rod 210 is equipped with sealing plug 211, the concave arc surface is formed on sealing plug 211, and the concave arc surface is opposite to water inlet channel 241. Sealing plug 211 prevents water from leaking to the force sensing element at the rear end through the gap between piston rod 210 and the inner wall of piston cavity 242. The concave arc surface is arranged to increase the sealing property by extruding sealing plug 211 outward when it is pressed.

[0039] In some embodiments of the utility model, sealing ring 250 is arranged between shell 240 and pressure sensing channel 140. Sealing ring 250 can compensate the assembly tolerance between shell 240 and pressure sensing channel 140 to prevent water from leaking through the gap between shell 240 and pressure sensing channel 140.

[0040] In some embodiments of the utility model, an electromagnetic valve and a control circuit board are further included. The electromagnetic valve is used to control the opening and closing of the water passing cavity 130, and the control circuit board is electrically connected with the electromagnetic valve and the force sensing element. The force sensing element can be linked with the electromagnetic valve of the flushing valve to adjust the opening degree (such as automatically adjusting the water flow size or the opening time length) or to provide overpressure protection (such as automatically opening the electromagnetic valve to release pressure when the water pressure reaches a certain value), so as to realize the energy-saving and water-saving or constant pressure water supply function.

[0041] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their 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), one side of the valve body (100) is provided with a pressure sensing channel (140) which communicates with the water inlet end (110), the pressure sensing assembly (200) comprises a piston rod (210) and a force sensing assembly, the force sensing assembly comprises a force sensing element which is a strain gauge (220) or a flexible pressure film (230), the piston rod (210) is arranged in the pressure sensing channel (140) and along the axial direction of the pressure sensing channel (140), the water pressure in the pressure sensing channel (140) can push the piston rod (210) to act on the force sensing assembly to trigger the force sensing element.

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), the shell (240) forms a water inlet channel (241) and a piston cavity (242) which are connected in the shell (240), the water inlet channel (241) communicates with the pressure sensing channel (140), the inner diameter of the piston cavity (242) is greater than the inner diameter of the water inlet channel (241), and the piston rod (210) is arranged in the piston cavity (242).

4. The flush valve of claim 3, wherein The outer wall of the shell (240) is provided with a first protrusion (243), 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 (243), the shell (240) has an unlocking state and a locking state after being inserted into the pressure sensing channel (140), in the unlocking state, the first protrusion (243) and the second protrusion (151) are axially misaligned with each other, and the first protrusion (243) is located in the annular space, in the locking state, the first protrusion (243) and the second protrusion (151) are axially aligned with each other, and the unlocking state and the locking state are switched by rotating the shell (240).

5. The flush valve of claim 4, wherein The first protrusion (243) is an L-shaped structure composed of a slider part (244) and a limiting part (245), the slider part (244) is arranged along the circumference of the shell (240), the limiting part (245) is arranged along the axial direction of the shell (240), and the limiting part (245) is connected to the rear side of the slider part (244), in the locked state, the slider part (244) and the second protrusion (151) are axially aligned with each other, and the limiting part (245) and the second protrusion (151) are in abutment in the circumferential direction.

6. The flush valve of claim 3 wherein, When the force sensing element is a strain gauge (220), the force sensing assembly further comprises a first steel sheet (221) and a first cover (222), the first cover (222) is mounted to the rear end of the shell (240), the first steel sheet (221) is clamped between the shell (240) and the first cover (222), and the strain gauge (220) is attached to the first steel sheet (221), the water pressure in the pressure sensing channel (140) can push the piston rod (210) to contact and press the first steel sheet (221), so that the first steel sheet (221) is strained.

7. The flush valve of claim 3 wherein, When the force sensing element is a flexible pressure film (230), the force sensing assembly further comprises a second steel sheet (231), a second cover (232) and a rubber pad (233), the second cover (232) is mounted to the rear end of the shell (240), the second cover (232) forms a receiving cavity (234) with an opening facing the pressure sensing channel (140), the flexible pressure film (230) is attached to the bottom wall of the receiving cavity (234), the second steel sheet (231) and the rubber pad (233) are embedded in the receiving cavity (234), and the rubber pad (233) is clamped between the second steel sheet (231) and the flexible pressure film (230), the water pressure in the pressure sensing channel (140) can push the piston rod (210) to contact and press the second steel sheet (231), so that the flexible pressure film (230) is synchronously pressed.

8. The flush valve of claim 3 wherein, The front end of the piston rod (210) is provided with a sealing plug (211), the sealing plug (211) forms a concave arc surface, and the concave arc surface faces the water inlet channel (241).

9. The flush valve of claim 3 wherein, A sealing ring (250) is arranged between the shell (240) and the pressure sensing channel (140).

10. The flush valve of claim 1, wherein An electromagnetic valve and a control circuit board are further included, the electromagnetic valve is used for controlling the opening and closing of the water passing cavity (130), and the control circuit board is electrically connected with the electromagnetic valve and the force sensing element. An electromagnetic valve and a control circuit board are further included, the electromagnetic valve is used for controlling the opening and closing of the water passing cavity (130), and the control circuit board is electrically connected with the electromagnetic valve and the force sensing element.

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