CN202796730U - Differential pressure switch - Google Patents
Differential pressure switch Download PDFInfo
- Publication number
- CN202796730U CN202796730U CN 201220371350 CN201220371350U CN202796730U CN 202796730 U CN202796730 U CN 202796730U CN 201220371350 CN201220371350 CN 201220371350 CN 201220371350 U CN201220371350 U CN 201220371350U CN 202796730 U CN202796730 U CN 202796730U
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- high pressure
- outlet pipe
- pressure chest
- water inlet
- push rod
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Abstract
The utility model provides a differential pressure switch, comprising a housing, an inlet pipe, an outlet pipe, a diaphragm sheet, an action board, a push rod, a moving contact and a power switch device. The inlet pipe and the outlet pipe are both arranged in the housing. A cavity is arranged in the housing. The periphery of the diaphragm sheet is fixedly connected with the inner wall of the cavity, and the cavity is divided to a high pressure cavity and a low pressure cavity. A high pressure cavity inlet pipe, a high pressure cavity outlet pipe and a constant pressure pipe are also arranged in the housing. The flow area of the high pressure cavity inlet pipe is larger than the flow area of the high pressure cavity outlet pipe. The action board is contacted to the diaphragm sheet. A push rod aperture is also arranged in the housing. The push rod is fixedly connected with the action board. The push rod aperture is provided with a moving slot, and the moving contact fixedly connected with the push rod is arranged in the moving slot. The push rod is provided with a push rod spring with two ends respectively connected with the inner wall of the push rod aperture and the moving contact. The power switch device is fixedly arranged out of the housing. According to the differential pressure switch, the volume is small, the structure is simple, the performance is more stable, and the differential pressure switch is specially suitable for miniature water heaters such as an electric faucet.
Description
Technical field
The utility model relates to water-pressure starter, particularly the pressure difference switch of quick-heating type electric water heater.
Background technology
The advantage of quick-heating type electric water heater is exactly water flowing energising, cut the supply of water and electricity, and what realize this function is exactly water-pressure starter.Existing water-pressure starter has following three kinds: pressure reduction disc type, gravity type and vane type.
To be water enter from the middle part of pressure differential disc high pressure chest pressure reduction disc type water-pressure starter, after the water (flow) direction folding turnback, flow out from upper hole, then flow to Venturi tube, have a pressure port and communicate with the low-pressure cavity of pressure differential disc by pressure pipe at the aditus laryngis of Venturi tube, because Venturi tube aditus laryngis place sectional area is minimum, according to bernoulli principle, current accelerate herein, pressure drop, make the pressure of pressure differential disc right side high pressure chest apparently higher than the left side low-pressure cavity, so push rod drives sensitive switch work, when closing water valve, because water does not flow, the pressure of pressure differential disc both sides is identical, and sensitive switch cuts out under the effect of the reset force of push rod.The shortcoming of this device is that complex structure, volume are large.
When the operation principle of gravity type water-pressure starter is anhydrous, magnetic patch falls down under Action of Gravity Field and drops on the bottom surface, this moment, magnetic patch was away from transducer, the not conducting of magnetic switch transducer, having in the situation of water flow, the current that up flow produce a climbing power to magnetic patch, when climbing power greater than magnetic patch weight then magnetic patch be lifted, this moment, magnetic patch made sensor conducts near transducer.Magnetic patch is located at water inlet pipe inside in this device.Because long period of soaking is in water, magnetic patch is demagnetization slowly, unstable properties.And metallics or impurity in the easy magnetic water of magnetic patch, when running up to when a certain amount of, magnetic patch will be stuck in the water inlet pipe stiff.As stuck when starting, water heater can't be worked, but is safe from danger; Stuck when closing water after use, water heater will work under anhydrous condition, causes the water heater dry combustion method, is very easy to cause danger.
The vane type water-pressure starter is to work as to have current out-of-date, and impeller is equipped with little magnetic patch just by red switch at each blade, during the close Hall element of magnetic patch, and the Hall element conducting, Hall element disconnects when leaving.Can measure water velocity according to the umber of pulse that Hall element produces, judge according to water velocity whether machine is worked and should be exported much power.This kind device also is divided into two kinds, and a kind of is axial type, and a kind of is tangential.In this device, demagnetization or stuck situation equally also can appear in magnetic patch.And be detained easily impurity between support and the impeller shaft, and affect the rotation of impeller, cause this device to work.
In addition, existing water-pressure starter is not stablized the function of hydraulic pressure, and the obvious fluctuation of hydraulic pressure is influential to the supply meeting of the heating process of water heater and hot water.
The utility model content
The purpose of this utility model provides a kind of pressure difference switch.
According to an aspect of the present utility model, pressure difference switch is provided, comprise shell, water inlet pipe, outlet pipe, diaphragm, action movie, push rod, movable contact spring and power on/off switching device.Water inlet pipe and outlet pipe all are located in the shell.Enclosure is provided with cavity.Diaphragm is made of rubber, sheet metal or other elastomeric material, and it is bowl-shape to be spill.The diaphragm periphery is fixed with cavity inner wall, and cavity is separated into high pressure chest and low-pressure cavity.Enclosure also be provided with high pressure chest water inlet pipe, high pressure chest outlet pipe and etc. pressure pipe.The high pressure chest water inlet pipe is communicated with water inlet pipe and high pressure chest, and the high pressure chest outlet pipe is communicated with outlet pipe and high pressure chest.The discharge area of high pressure chest water inlet pipe is greater than the discharge area of high pressure chest outlet pipe.Etc. pressure pipe outlet pipe is communicated with low-pressure cavity.Action movie is the dish-shaped disk of rigidity, and is inconsistent with diaphragm.Enclosure also is provided with the push-rod hole of accommodating push rod.Push rod is fixedly connected with action movie, and can move around vertically in push-rod hole.Push-rod hole is provided with shifting chute, is provided with movable contact spring in the shifting chute.Movable contact spring and push rod are fixed, and can move around in shifting chute.Push rod is equipped with push rod spring, and the push rod spring two ends are connected with movable contact spring with the inwall of push-rod hole respectively.The power on/off switching device is fixed in housing exterior.
Adopt the pressure difference switch of above technical scheme in the water situation, running water is entered in the high pressure chest through the high pressure chest water inlet pipe by water inlet pipe first, then flows out through outlet pipe by the high pressure chest outlet pipe.Because the discharge area of high pressure chest water inlet pipe is greater than the discharge area of high pressure chest outlet pipe, the water in the high pressure chest can not all flow into outlet pipe, has produced thus high pressure in high pressure chest.And low-pressure cavity also be provided be communicated with outlet pipe etc. pressure pipe, the hydraulic pressure in the low-pressure cavity is identical with outlet pipe thus.Owing to above reason, form pressure difference between high pressure chest and the low-pressure cavity.This pressure difference acts on the larger diaphragm of surface area ratio, is converted into high pressure to the thrust of low-pressure side.Deform after diaphragm is stressed, thrust is passed to fixing with it action movie.It is mobile outside low-pressure cavity along push-rod hole that action movie drives push rod.Be fixed on the push rod movable contact spring along shifting chute near and trigger the power on/off switching device.When terminal water valve closing, when hydraulic pressure is identical in high pressure chest and the low-pressure cavity or tap water cut-off, when hydraulic pressure is zero in high pressure chest and the low-pressure cavity, without pressure difference, diaphragm just there is not thrust yet between high pressure chest and the low-pressure cavity.Push rod moves in low-pressure cavity under the effect of push rod spring, and push rod drives action movie and promotes the diaphragm fixing with action movie, makes its answer initial condition.Be fixed on movable contact spring on the push rod along shifting chute away from the power on/off switching device.By above process, the pressure difference switch that the utility model provides can be judged the state of the current wherein of flowing through accurately.This device volume is little, and is simple in structure, is particularly suitable at small water heater, such as using on the electric hot water tap.
In some embodiments, the power on/off switch is sensitive switch.The contact of sensitive switch is near movable contact spring.Movable contact spring moves around in shifting chute, just near or leave the contact of sensitive switch, sensitive switch is conducting or disconnection just.Thus, can adopt the larger sensitive switch of capacity, such as 25A, thereby realize the directly function of driving high power load.
In some embodiments, the diaphragm position corresponding with the high pressure chest outlet pipe is provided with the plug that the shape of entrance one end of shape and high pressure chest outlet pipe is complementary.Current in the high pressure chest enter the high pressure chest outlet pipe by the gap between plug and the high pressure chest outlet pipe.The high pressure chest water inlet pipe is provided with water feed apparatus, comprises piston, connecting rod and water inlet spring.The shape of the entrance of piston-shaped and high pressure chest water inlet pipe is complementary.Connecting rod one end and piston are fixed, and the other end and diaphragm are fixed.The water inlet spring fitting is on connecting rod, and two ends are connected with high pressure chest water inlet pipe inwall with connecting rod respectively.When diaphragm did not deform, the water inlet gap was maximum; When the diaphragm distortion was maximum, the water inlet gap disappeared.When the hydraulic pressure in the water inlet pipe increased, the hydraulic pressure in the high pressure chest increased thereupon, caused the pressure difference between high pressure chest and the low-pressure cavity to increase.The deflection of diaphragm increases, and the connecting rod fixing with diaphragm moves in high pressure chest thereupon.Connecting rod drives and its fixing piston, so that the water inlet gap reduces, has reduced the flow that flows into the current of high pressure chest.Meanwhile, the deflection of diaphragm increases, the plug relatively high pressure chamber outlet pipe of being located on the diaphragm is outwards mobile, gap between plug and the high pressure chest outlet pipe increases, increased the discharge area of high pressure chest outlet pipe, this causes again the pressure difference between high pressure chest and the low-pressure cavity to reduce, and the deflection of diaphragm reduces thereupon, thereby has formed a close loop control circuit that suppresses high pressure.Otherwise when the hydraulic pressure in the water inlet pipe reduced, the hydraulic pressure in the high pressure chest reduced thereupon, causes the pressure difference between high pressure chest and the low-pressure cavity to reduce.The deflection of diaphragm reduces, with the fixing connecting rod of diaphragm thereupon to high pressure chest water inlet in-pipe.Connecting rod drives and its fixing piston, so that the water inlet gap increases, has increased the flow that flows into the current of high pressure chest.Meanwhile, the deflection of diaphragm reduces, the plug relatively high pressure chamber outlet pipe of being located on the diaphragm moves inward, gap between plug and the high pressure chest outlet pipe reduces, reduced the discharge area of high pressure chest outlet pipe, this causes again the pressure difference between high pressure chest and the low-pressure cavity to increase, and the deflection of diaphragm increases thereupon, thereby has formed a close loop control circuit that suppresses low pressure.By above process, the pressure difference switch that the utility model provides can have the function of stable hydraulic pressure.
In some embodiments, the high pressure chest outlet pipe is provided with adjusting screw(rod).By screwing in and screw out the discharge area that adjusting screw(rod) can be regulated the high pressure chest outlet pipe.When externally tap water hydraulic is inadequate, can by screwing in adjusting screw(rod) to reduce the discharge area of high pressure chest outlet pipe, increase the hydraulic pressure in the high pressure chest.Thus, this pressure difference switch can work under low hydraulic pressure state.
Description of drawings
Fig. 1 is the pressure difference switch schematic diagram of the utility model one execution mode.
Fig. 2 is the right view of pressure difference switch shown in Figure 1.
Fig. 3 is that pressure difference switch shown in Figure 2 is along the profile of B-B.
Fig. 4 is the outer casing construction drawing of pressure difference switch shown in Figure 3.
Fig. 5 is the partial enlarged drawing of part shown in the D among Fig. 3.
Fig. 6 is that pressure difference switch shown in Figure 1 is along the profile of A-A.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Fig. 1 ~ Fig. 6 has schematically shown the pressure difference switch according to a kind of execution mode of the present utility model.As shown in the figure, this device comprises shell 1, water inlet pipe 2, outlet pipe 3, diaphragm 6, action movie 10, push rod 11, movable contact spring 13 and sensitive switch 15.Water inlet pipe 2 and outlet pipe 3 all are located in the shell 1.Water inlet pipe 2 is connected with outlet pipe and is respectively equipped with in the water inlet pipe that is connected with upper lower pipeline tooth joint 31 in the tooth joint 21 and outlet pipe.The duroplasts of shell 1 usefulness high temperature high voltage resistant is made, and inside is provided with cavity 12.Diaphragm 6 usefulness rubber are made, and it is bowl-shape to be spill.Diaphragm 6 peripheries are fixed with cavity 12 inwalls, and cavity 12 is separated into high pressure chest 4 and low-pressure cavity 5.Shell 11 inside also be provided with high pressure chest water inlet pipe 22, high pressure chest outlet pipe 32 and etc. pressure pipe 8.High pressure chest water inlet pipe 22 is communicated with water inlet pipe 2 and high pressure chest 4, and high pressure chest outlet pipe 32 is communicated with outlet pipe 3 and high pressure chest 4.The discharge area of high pressure chest water inlet pipe 22 is greater than the discharge area of high pressure chest outlet pipe 32.Etc. pressure pipe 8 outlet pipe 3 is communicated with low-pressure cavity 5.Diaphragm 6 and high pressure chest outlet pipe 32 corresponding positions are provided with the plug 61 that the shape of entrance one end of shape and high pressure chest outlet pipe 32 is complementary.Current in the high pressure chest 4 enter high pressure chest outlet pipe 32 by the gap between plug 61 and the high pressure chest outlet pipe 32.High pressure chest outlet pipe 32 is provided with adjusting screw(rod) 7.By screwing in and screw out the discharge area that adjusting screw(rod) 7 can be regulated high pressure chest outlet pipe 32.When externally tap water hydraulic is inadequate, can reduce by screwing in adjusting screw(rod) 7 discharge area of high pressure chest outlet pipe 32, to increase the hydraulic pressure in the high pressure chest.High pressure chest water inlet pipe 22 is provided with water feed apparatus 9, comprises piston 91, connecting rod 92 and water inlet spring 93.Piston 91 is cylindricality, is complementary with the shape of the entrance of high pressure chest water inlet pipe 22.Current in the water inlet pipe 2 enter high pressure chest outlet pipe 32 by the water inlet gap 94 between piston 91 and the high pressure chest water inlet pipe 22.Connecting rod 92 1 ends and piston 91 are fixing, and the other end and diaphragm 6 are fixing.Water inlet spring 93 is installed on the connecting rod 92, and two ends are connected with high pressure chest water inlet pipe 22 inwalls with connecting rod 92 respectively.Action movie 10 is that dish-shaped disk and the diaphragm 6 of rigidity is inconsistent.Shell 1 inside also is provided with the push-rod hole 111 of accommodating push rod 11.Push rod 11 is fixedly connected with action movie 10, and can move around vertically in push-rod hole 111.Push-rod hole 111 is provided with shifting chute 112, and 112 are provided with movable contact spring 13 in the shifting chute.Movable contact spring 13 is fixing with push rod 11, and can move around in shifting chute 112.Push rod 11 is equipped with push rod spring 14, and push rod spring 14 two ends are connected with movable contact spring 13 with the inwall of push-rod hole 111 respectively.Sensitive switch 15 is fixed in shell 1 outside.Sensitive switch 15 is provided with contact 151.Contact 151 is near movable contact spring 13.Movable contact spring 13 moves around in shifting chute 112, just near or leave the contact 151 of sensitive switch 15, sensitive switch 15 is conducting or disconnection just.In other execution mode, diaphragm 6 can also adopt sheet metal or other elastomeric material to make.
The operation principle that above-mentioned pressure difference switch is judged the state of the current wherein of flowing through is as follows:
Running water elder generation by intaking gap 94 in high pressure chest water inlet pipe 22 enters high pressure chest 4, then enters high pressure chest outlet pipe 32 by the gap between plug 61 and the high pressure chest outlet pipe 32 by water inlet pipe 2, flows out from outlet pipe 3 again.Because the discharge area of high pressure chest water inlet pipe 22 is greater than the discharge area of high pressure chest outlet pipe 32,4 water can not all flow into outlet pipe 3 in the high pressure chest, thus at the high pressure chest 4 interior high pressure that produced.And low-pressure cavity 5 also be provided be communicated with outlet pipe 3 etc. pressure pipe 8, the hydraulic pressure in the low-pressure cavity 5 are managed identical with water outlet 3 thus.Owing to above reason, form pressure difference between high pressure chest 4 and the low-pressure cavity 5.This pressure difference acts on the larger diaphragm of surface area ratio 6, is converted into high pressure to the thrust of low-pressure side.Deform after diaphragm 6 is stressed, thrust is passed to fixing with it action movie 10.Action movie 10 drives push rod 11 5 outer movements along push-rod hole 111 to low-pressure cavity.Be fixed on movable contact spring 13 on the push rod 11 along shifting chute 112 near contacts 151, trigger sensitive switch 15, make it conducting.When terminal water valve closing high pressure chest 4 is identical with low-pressure cavity 5 interior hydraulic pressure or tap water cut-off high pressure chest 4 and low-pressure cavity 5 interior hydraulic pressure when being zero, without pressure difference, diaphragm 6 just there is not thrust yet between high pressure chest 4 and the low-pressure cavity 5.To low-pressure cavity 5 interior movements, push rod 11 drives the diaphragm 6 that action movie 10 promotes and action movie 10 is fixed to push rod 11 under the effect of push rod spring 14, makes it reply initial condition.Be fixed on movable contact spring 13 on the push rod along shifting chute 112 away from contact 151, sensitive switch 15 disconnects.By above process, the pressure difference switch that the utility model provides can be judged the state of the current wherein of flowing through accurately.Above-mentioned sensitive switch 15 can adopt the larger sensitive switch of capacity, such as the sensitive switch of 25A, thereby realizes the directly function of driving high power load.
The operation principle that above-mentioned pressure difference switch is stablized hydraulic pressure is as follows:
When the hydraulic pressure in the water inlet pipe 2 increased, the hydraulic pressure in the high pressure chest 3 increased thereupon, caused the pressure difference between high pressure chest 4 and the low-pressure cavity 5 to increase.The deflection of diaphragm 6 increases, with the fixing connecting rod 92 of diaphragm 6 thereupon to high pressure chest 4 interior movements.Connecting rod 92 drives and its fixing piston 91, so that water inlet gap 94 reduces, has reduced the flow that flows into the current of high pressure chest 4.Meanwhile, the deflection of diaphragm 6 increases, the plug 61 relatively high pressure chamber outlet pipes 32 of being located on the diaphragm 6 are outwards mobile, gap between plug 61 and the high pressure chest outlet pipe 32 increases, increased the discharge area of high pressure chest outlet pipe 32, this causes again the pressure difference between high pressure chest 4 and the low-pressure cavity 5 to reduce, and the deflection of diaphragm 6 reduces thereupon, thereby has formed a close loop control circuit that suppresses high pressure.Otherwise when the hydraulic pressure in the water inlet pipe 2 reduced, the hydraulic pressure in the high pressure chest 4 reduced thereupon, causes the pressure difference between high pressure chest 4 and the low-pressure cavity 5 to reduce.The deflection of diaphragm 6 reduces, with the fixing connecting rod 92 of diaphragm 6 thereupon to the 22 interior movements of high pressure chest water inlet pipe.Connecting rod 92 drives and its fixing piston 91, so that water inlet gap 94 increases, has increased the flow that flows into the current of high pressure chest 4.Meanwhile, the deflection of diaphragm 6 reduces, the plug 61 relatively high pressure chamber outlet pipes 32 of being located on the diaphragm 6 move inward, gap between plug 61 and the high pressure chest outlet pipe 32 reduces, reduced the discharge area of high pressure chest outlet pipe 32, this causes again the pressure difference between high pressure chest 4 and the low-pressure cavity 5 to increase, and the deflection of diaphragm 6 increases thereupon, thereby has formed a close loop control circuit that suppresses low pressure.By above process, the pressure difference switch that the utility model provides can realize stablizing the function of hydraulic pressure.In some other execution modes, the power on/off switching device can also adopt other switching devices such as magnetic switch, head-shaking switch or slide switch.
Above-described only is execution modes more of the present utility model.For the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model creation design, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (4)
1. pressure difference switch, it is characterized in that, comprise shell, water inlet pipe, outlet pipe, diaphragm, action movie, push rod, movable contact spring and power on/off switching device, described water inlet pipe and described outlet pipe all are located in the described shell, described enclosure is provided with cavity, described diaphragm periphery is fixed with the inwall of described cavity, and described cavity is separated into high pressure chest and low-pressure cavity, described enclosure also is provided with the high pressure chest water inlet pipe, the high pressure chest outlet pipe and etc. pressure pipe, described high pressure chest water inlet pipe is communicated with described water inlet pipe and described high pressure chest, described high pressure chest outlet pipe is communicated with described outlet pipe and described high pressure chest, the discharge area of described high pressure chest water inlet pipe is greater than the discharge area of described high pressure chest outlet pipe, the pressure pipe such as described is communicated with described outlet pipe with described low-pressure cavity, described action movie is fixedly connected with described diaphragm, described enclosure also is provided with the push-rod hole of accommodating described push rod, described action movie and described diaphragm are inconsistent, and can in described push-rod hole, move around vertically, described push-rod hole is provided with shifting chute, be provided with movable contact spring in the described shifting chute, described movable contact spring and described push rod are fixed, and can in described shifting chute, move around, described push rod is equipped with push rod spring, described push rod spring two ends are connected with described movable contact spring with the inwall of described push-rod hole respectively, and described power on/off switching device is fixed in described housing exterior.
2. pressure difference switch according to claim 1 is characterized in that described power on/off switch is sensitive switch, and the contact of described sensitive switch is near described movable contact spring, and described movable contact spring moves around in described shifting chute.
3. pressure difference switch according to claim 2, it is characterized in that, the described diaphragm position corresponding with described high pressure chest outlet pipe is provided with the plug that the shape of entrance one end of shape and described high pressure chest outlet pipe is complementary, described high pressure chest water inlet pipe is provided with water feed apparatus, described water feed apparatus comprises piston, connecting rod and water inlet spring, the shape of entrance one end of described piston-shaped and described high pressure chest water inlet pipe is complementary, described connecting rod one end and described piston are fixed, the other end and diaphragm are fixed, described water inlet spring fitting is on connecting rod, and two ends are connected with high pressure chest water inlet pipe inwall with connecting rod respectively.
4. pressure difference switch according to claim 3 is characterized in that, described high pressure chest outlet pipe is provided with the adjusting screw(rod) of the discharge area of regulating described high pressure chest outlet pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220371350 CN202796730U (en) | 2012-07-30 | 2012-07-30 | Differential pressure switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220371350 CN202796730U (en) | 2012-07-30 | 2012-07-30 | Differential pressure switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202796730U true CN202796730U (en) | 2013-03-13 |
Family
ID=47823936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220371350 Expired - Fee Related CN202796730U (en) | 2012-07-30 | 2012-07-30 | Differential pressure switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202796730U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504941A (en) * | 2016-12-27 | 2017-03-15 | 中山市博安泰电器科技有限公司 | A kind of novel differential pressure switch |
| CN110630905A (en) * | 2018-06-22 | 2019-12-31 | 西门子股份公司 | Pressure element |
-
2012
- 2012-07-30 CN CN 201220371350 patent/CN202796730U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504941A (en) * | 2016-12-27 | 2017-03-15 | 中山市博安泰电器科技有限公司 | A kind of novel differential pressure switch |
| CN110630905A (en) * | 2018-06-22 | 2019-12-31 | 西门子股份公司 | Pressure element |
| US11101089B2 (en) | 2018-06-22 | 2021-08-24 | Siemens Aktiengesellschaft | Independent pressure monitoring switch element |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20140730 |
|
| EXPY | Termination of patent right or utility model |