A kind of relief valve and the coffee machine that is provided with this relief valve that is used for coffee machine
The utility model relates to a kind of relief valve, particularly a kind of relief valve that is used for coffee machine; The utility model also relates to a kind of coffee machine that is provided with this relief valve.
The relief valve that uses in the coffee machine mainly is after coffee brewing is accomplished, to let out except that residual pressure for whole brewing system, receives the electromagnetic pump outlet usually, and then is connected on the heater, is connected to brewing cavity through heater.
Chinese patent ZL200510045199.4 discloses a kind of relief valve; Comprise water inlet, delivery port and pressure relief opening, be provided with pressure release valve plug and difference overhead at the pressure relief opening place in the spring of pressure relief opening and pressure release valve plug, its operation principle is: when water pump is started working; Pressure in the pipeline increases gradually; After acting on the elastic force of relief valve pressure beyond the Great Wall greater than spring, the pressure release valve plug moves to pressure relief opening, and the pressure release valve plug is blocked pressure relief opening makes water flow out from delivery port.When water pump quit work, the pressure in the pipeline diminished gradually, and when acting on relief valve beyond the Great Wall behind the elastic force of pressure less than spring, the pressure release valve plug resets under the elastic force effect, opens pipeline and begins to drain residual pressure.This structure often needs very big pressure just can make the pressure release valve plug overcome the elastic force of spring; At last pressure relief opening is stopped up; And before pressure release, also need experience such process: the pressure in the wait pipeline just can make the pressure release valve plug reset when dropping to less than spring force, and then accomplishes pressure release.This device too relies on the performance of spring, and manufacturing cost is high, and relief valve resets slowly simultaneously, inefficiency, and job stability is not enough; On the other hand, this relief valve can only be applicable to pressure release, and can't reach the effect that prevents that pressure is excessive.
Summary of the invention
The technical problem that the utility model will solve provides a kind of simple in structure, working stability, can prevent the relief valve that pressure is excessive.
In order to solve the problems of the technologies described above, the technical scheme that the present invention takes is:
Comprise valve body and screw the valve nut on valve body; Be provided with valve pocket in the valve body; Valve body is provided with water inlet, delivery port and the pressure relief opening that communicates with valve pocket respectively; Be provided with between water inlet and the pressure relief opening overvoltage valve plug and and the excess pressure valve jam-pack connects airtight the sealing gasket that touches and place excess pressure valve to make the overvoltage valve plug open or close the elastomeric element of passage between water inlet and the pressure relief opening beyond the Great Wall; Be provided with through hole in the said overvoltage valve plug, the nearly pressure relief opening end of said sealing gasket is provided with the blind hole that is communicated with overvoltage valve plug through hole, and the sidewall of nearly inlet end is provided with the relief hole that is communicated with water inlet and blind hole under normal conditions.
Said sealing gasket is a cylindrical structure, and the sealing gasket periphery is provided with packing ring.Further, sealing gasket is made by silica gel or rubber.
Preferably, the overvoltage valve plug is the stepped cylindrical structure.
Preferably, said elastomeric element was a pressing spring.
Preferably, be provided with the nut seal circle between said valve nut and the valve pocket inwall.
The utility model also relates to a kind of coffee machine, comprises water pump and brewing cavity, and coffee machine is equipped with above-mentioned relief valve, and said relief valve water inlet is connected with the coffee machine water pump, and delivery port is connected with the coffee machine brewing cavity, and said pressure relief opening is connected with waste water box or water tank.
Because the utility model adopted the sealing gasket that has relief hole, saved valve plug of the prior art and spring, the structure of relief valve is further simplified, because relief hole leans on self elasticity to reset rapidly, do not receive the restriction of spring, job stability is higher; On the other hand, the overvoltage valve plug of the utility model can prevent that the valve pocket internal pressure is excessive, guarantees that coffee machine is safe in utilization.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the utility model gasket structure sketch map;
Fig. 3 is the cutaway view of the utility model sealing gasket;
Like Fig. 1 to relief valve shown in Figure 3; The utility model comprises valve body 1 and screws the valve nut 5 at valve body 1 one ends; Valve body 1 is a hollow tubular, and its inside is provided with valve pocket 13, is provided with the water inlet 10 that communicates with valve pocket 13 with valve nut 5 opposite ends on the valve body 1; On the sidewall of valve body 1, be provided with the delivery port 11 that communicates with valve pocket 13, be provided with the pressure relief opening 12 that communicates with valve pocket 13 near valve nut 5 ends near water inlet 10 ends.The water inlet 10 of relief valve is connected with the coffee machine water pump, and delivery port 11 is connected with the coffee machine brewing cavity, and pressure relief opening 12 is connected with extraneous waste water box.On valve pocket 13 inwalls between water inlet 10 and the pressure relief opening 12, be provided with tread 14; Make valve pocket 13 be slightly less than caliber near pressure relief opening 12 1 ends near the caliber of delivery port 11 1 ends; On tread 14, also be provided with overvoltage valve plug 2 and distinguish the excessively pressing spring 3 of overhead in overvoltage valve plug 2 and valve nut 5; Overvoltage valve plug 2 is the stepped cylindrical structure, and the inside of overvoltage valve plug 2 is provided with the axially extending bore that communicates with valve pocket 13, one of which end diameter less than other end diameter so that pressing spring 3 was installed.Between the utility model tread 14 and overvoltage valve plug 2, also be provided with sealing gasket 4, sealing gasket 4 is roughly column structure, and the somewhat larger in diameter of its nearly pressure relief opening 12 1 ends is in the diameter of nearly water inlet 10 1 ends; Sealing gasket 4 peripheries are provided with the packing ring 41 that can be stuck on the tread 14; Be provided with a blind hole 42 that communicates with overvoltage valve plug 2 through holes in the sealing gasket 4, sealing gasket 4 is provided with the relief hole 43 that communicates with blind hole near a distolateral wall of water inlet 10, because the utility model adopts silica gel to make; Quality is soft; Be easy to receive the extruding of external force and by shutoff, certainly, the sealing gasket 4 of the utility model also is not limited to use silica gel material near the relief hole 43 of sealing gasket 4 ends; Also can use elastomeric material to make, as long as can make material that the relief hole 43 of sealing gasket 4 is extruded obstruction easily all within the utility model protection domain.
More than be merely a specific embodiment of the utility model, the overvoltage valve plug 2 of the utility model is not limited to stepped cylindrical, also can be other shapes, as cone-shaped, as long as can be with mode work described herein.The utility model also has no restriction to water inlet 10, delivery port 11 with the layout of pressure relief opening 12 on valve body 1; Overvoltage valve plug 2 is except can being located between water inlet 10 and the pressure relief opening 12; Also can be located at pressure relief opening 12 places; In like manner, the pressing spring 3 of crossing that this use is novel also can substitute with the parts of shell fragment or spring-like.In order further to increase sealing effectiveness, the utility model also is provided with nut seal circle 6 between valve nut 5 and valve pocket 13 inwalls.
When pump working; Water gets into valve pocket 13 from water inlet 10; Sealing gasket is squeezed under the effect of hydraulic pressure 43 shutoff of the relief hole on the sidewall; Because overvoltage valve plug 2 received the resistance of pressing spring 3 and sealing gasket 4 closely is pressed on the tread 14, the water in the valve pocket 13 can only flow out from delivery port 11.When the hydraulic pressure in the valve pocket 13 was excessive, the water pressure that sealing gasket 4 receives was greater than the resistance of crossing pressing spring 3, and sealing gasket 4 promotion overvoltage valve plugs 2 move towards pressure relief opening 12 and carry out pressure release.Under normal conditions, promptly under the out-of-work state of water pump, because the hydraulic pressure in the valve pocket 13 reduce, sealing gasket 4 resets relief hole 43 rapidly under the effect of self elastic force, and the residual pressures in the valve pocket 13 gush from pressure relief opening 12 through relief hole 43.
More than be merely a specific embodiment of the utility model, but the design concept of the utility model is not limited thereto, all insubstantial modifications of utilizing this design that the utility model is made all fall within the protection domain of the utility model.