CN107951402B - Bubble breaking steam valve and electric cooker - Google Patents

Abstract

The invention discloses a foam breaking steam valve and an electric cooker, wherein a foam breaking structure is arranged in a steam valve cavity (B) of the foam breaking steam valve, the foam breaking steam valve comprises a rolling body (1) and a foam breaking cavity (B1) with two open ends, the foam breaking cavity is provided with an air inlet and an air outlet, the bottom wall of the foam breaking cavity is formed into a rolling inclined wall (21) which is inclined upwards, and the rolling body (1) can roll upwards along the rolling inclined wall under the pushing of bottom steam or roll downwards under the action of self gravity, so that the following requirements are met:g is the gravity of the rolling bodies; p is a pressure difference value between the steam pressure at the bottom and the steam pressure at the top of the foam breaking cavity, and p=50 to 300pa; s is the action area of steam on the rolling bodies, and S=90-180 mm ² A is the inclination angle of the rolling inclined wall relative to the horizontal plane, and a=5° to 30 °. The bubble breaking steam valve and the electric cooker can effectively improve the control of micro-pressure of the inner cooker, improve the bubble removing effect, and have simple and practical structure and easy maintenance and cleaning.

Description

Bubble breaking steam valve and electric cooker

Technical Field

The invention belongs to the field of household appliances, and particularly relates to an electric cooker and a steam valve assembled on the electric cooker.

Background

With the improvement of life quality of people, higher requirements are put on the performance of household appliances such as electric cookers and the like, and manufacturers compete more strongly, so that people are in the day in the past to buy news such as electric cookers and the like in a burst manner. The improvement and the change of the demand of the electric rice cooker are mainly characterized in that not only the quality is required to be too hard, but also the taste of the cooked rice is good so as to meet the demands of the masses.

In the production design process of the electric cooker, the design of an inner pot and a coating, the heating uniformity, the heating control and the like are mainly improved, but the design of a steam valve is also an important one. In a common electric cooker, a steam valve is only used for exhausting and removing bubbles in the cooking process, even a plurality of steam valves have no obvious bubble removing effect, the use comfort of a user on a product is affected, and the steam valve has a plurality of defects on the regulation and control functions of the steam pressure of an inner cooker, so that the final taste of rice is also greatly affected by the factors.

In addition, the design structure of the steam valve is too complicated and exquisite, and is high in cost, poor in maintainability, low in stability, uncontrolled in sliding of the bubble breaker and inconvenient to clean.

Disclosure of Invention

Aiming at the defects or drawbacks in the prior art, the invention provides the bubble breaking steam valve and the electric cooker with the bubble breaking steam valve, so that the control on the micro pressure of the inner cooker is effectively improved, the bubble removing effect is improved, the structure is simple and compact, the miniaturization of the steam valve is realized, the service performance is reliable and practical, and the maintenance and the cleaning are easy.

In order to achieve the above object, the present invention provides a bubble breaking steam valve, in which a bubble breaking structure is provided in a steam valve cavity of the bubble breaking steam valve, the bubble breaking structure includes a rolling body and a bubble breaking cavity, the bubble breaking cavity has an air inlet and an air outlet, a bottom wall of the bubble breaking cavity is formed into a rolling inclined wall inclined upwards, the rolling body built in the bubble breaking cavity can roll upwards along the rolling inclined wall or roll downwards under the action of self gravity under the pushing of steam entering from the steam inlet, and the following conditions are satisfied:

wherein G is the gravity of the rolling bodies; p is a pressure difference value between the steam pressure at the bottom and the steam pressure at the top of the foam breaking cavity, and p=50-300 pa; s is the acting area of the steam on the rolling bodies, and S=90-180 mm ² A is an inclined angle of the rolling inclined wall relative to the horizontal plane, and a=5° to 30 °.

Preferably, both the rolling inclined wall and the rolling body have smooth surfaces.

Preferably, the volume ratio of the steam valve cavity to the foam breaking cavity is not less than 5.

Preferably, the pressure difference P ranges from 100pa to 200pa.

Preferably, a circumferential gap is formed between the rolling bodies and the peripheral wall of the foam breaking cavity, and the cross-sectional area S1 of the circumferential gap is 50-100 square millimeters.

Preferably, a circumferential gap of 0.5-4 mm is formed between the rolling bodies and the peripheral wall of the foam breaking cavity.

Preferably, the rolling bodies are cylindrical rollers arranged transversely to the rolling inclined wall, the rollers having a diameter D and an axial length L, the area of action of the steam on the rolling bodies s=d×l; and is also provided with

The foam breaking cavity is provided with a rectangular cross section, the width of the rectangular cross section is A1, the length of the rectangular cross section is A2, the cross section area S1=A1×A2-D×L of the circumferential gap,

preferably, circular ribs are formed on the peripheral wall of the roller, a top wall guide groove and a bottom wall guide groove are respectively formed on the top wall and the bottom wall of the foam breaking cavity, and when the roller rolls along the rolling inclined wall, the circular ribs are embedded into the top wall guide groove and the bottom wall guide groove to guide sliding;

wherein, the lateral clearance is formed between the outer peripheral surface of the roller and the top wall surface and the bottom wall surface of the foam breaking cavity.

Preferably, side wall protrusions protruding upwards are formed on two sides of the bottom wall guide groove respectively, the outer peripheral wall of the roller is supported on the two side wall protrusions, and the protrusion height of the circular bead is smaller than the depth of the bottom wall guide groove.

Preferably, guide posts extend from two circumferential ends of the roller respectively, side wall guide grooves parallel to the rolling inclined wall are formed on side walls of the foam breaking cavities at two sides of the foam breaking cavities respectively, and the guide posts extend into the side wall guide grooves to guide and move the rolling bodies;

the circumferential gap further comprises a vertical gap, and the depth of the side wall guide groove is smaller than the extending length of the guide post, so that the vertical gap is formed between the end face of the roller and the side wall of the foam breaking cavity.

Preferably, the foam breaking steam valve comprises a steam valve cover and a steam valve seat, the steam valve cover and the steam valve seat are connected with each other to form the steam valve cavity, the foam breaking cavity comprises a foam breaking track cover and a foam breaking cavity side wall arranged on the steam valve seat, and the foam breaking track cover is detachably connected to the foam breaking cavity side wall.

On the basis of the above, the invention also provides an electric cooker, and the bulb breaking steam valve is arranged on the cooker cover of the electric cooker.

In the bubble breaking steam valve, the bubble breaking structure with the bubble breaking cavity is particularly additionally arranged in the steam valve cavity, and bubbles are broken in a way that the rolling bodies roll along the inclined planes. When the optimal design ranges of parameters such as pressure in the cooker, size of the roller and inclination angle are known, the weight of the required roller can be calculated, the selection of materials is convenient, and in the ranges of the three parameters such as pressure in the cooker, size of the roller and inclination angle, the rolling body with smaller volume/area can be obtained under the condition of selecting common roller materials, and the steam valve with smaller volume of a foam breaking cavity designed according to the rolling body can be obtained.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a perspective exploded view of a bubble breaking steam valve according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the bubble breaking steam valve of FIG. 1 after assembly;

FIG. 3 is a cross-sectional view of C-C of FIG. 2;

FIG. 4 is a schematic diagram of a force analysis of a bubble breaking vapor valve of the present invention;

fig. 5 is a perspective view of a steam valve seat of the bubble breaking steam valve shown in fig. 1, wherein rolling elements and the like are omitted for clarity of illustration of sidewall guide grooves, upward stop ribs and the like;

FIG. 6 is an exploded view of the vapor valve base with rolling elements and foam breaking track cover in one embodiment;

FIG. 7 is a cross-sectional view A-A of one embodiment of a bubble breaking vapor valve after assembly; compared with fig. 2, the limiting rib plate is additionally arranged;

FIG. 8 is a cross-sectional view of C '-C' of FIG. 7;

FIG. 9 is a cross-sectional view A-A of one embodiment of the bubble breaking steam valve after assembly, as compared to FIG. 2, with the addition of the minimum spacing H between the baffle and the top wall of the bubble breaking chamber (i.e., the bubble breaking rail cover) and the diameter D of the rolling elements;

FIG. 10 is an E-E cross-sectional view of the bubble breaking steam valve shown in FIG. 1 after assembly;

FIG. 11 is a cross-sectional view of the bubble breaking vapor valve taken along line A-A of FIG. 1, similar to FIG. 9, except that a baffle extends downwardly from the top end of the top wall of the bubble breaking chamber;

FIG. 12 is a cross-sectional view of the bubble breaking steam valve shown in FIG. 11, taken along line E-E of FIG. 1 after assembly;

FIG. 13 is a cross-sectional view of the bubble breaking vapor valve taken along line A-A of FIG. 1, similar to FIG. 9, except with a flap extending laterally from the top end of the bubble breaking cavity sidewall;

FIG. 14 is a cross-sectional view of the bubble breaking steam valve shown in FIG. 13, taken along line E-E of FIG. 1 after assembly;

FIG. 15 is a perspective view of a rolling element in the bubble breaking steam valve shown in FIG. 1, the rolling element having a guide post;

FIG. 16 is a front view of another preferred construction of a rolling element having a circular bead but no guide post;

FIG. 17 is an axial cross-sectional schematic view of the rolling elements shown in FIG. 16;

FIG. 18 is an end view of the rolling element of FIG. 16; and

fig. 19 is another end view of the rolling element shown in fig. 16.

Reference numerals illustrate:

100. steam valve seat 200 steam valve cover

300. Sealing ring 101 steam inlet

102. The inner side wall of the bottom wall 103 of the steam valve seat

201. Steam outlet

221. Upward limit rib of side wall guide groove 222

223. Spacing gusset 224 installation inclined plane

1. Peripheral wall of foam breaking cavity of rolling body 2

3. Rolling gear structure 4 baffle

11. Inner core layer 12 outer cladding

13. Guide post 14 circular ring bead

15. Rolling inclined wall of circumferential clamping notch 21

22. Broken bubble track lid of broken bubble chamber lateral wall 23

A1 Width A2 length

B steam valve cavity B1 foam breaking cavity

D diameter H minimum spacing

F1 Thrust force component of gravity F2 of steam

G gravity L axial length

J1 Transverse gap J2 vertical gap

a inclination angle f friction force

Detailed Description

The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the positional relationship of the various components with respect to one another in the vertical, vertical or gravitational directions. Azimuth words such as "inner and outer" refer to the inside and outside of the chamber. "transverse, longitudinal" refers generally to both the transverse and longitudinal directions of the rolling inclined wall, the longitudinal direction of the rolling inclined wall being the oblique direction, i.e. obliquely downward or upward.

The invention provides a foam breaking steam valve, as shown in fig. 1 to 14, wherein a steam valve cavity B of the foam breaking steam valve is provided with a steam outlet 201 and a steam inlet 101, a foam breaking structure is particularly increased in the steam valve cavity B of the foam breaking steam valve, the foam breaking structure comprises a rolling body 1 and a foam breaking cavity B1 with two open ends, the bottom opening (i.e. an air inlet) of the foam breaking cavity B1 is communicated with the steam inlet 101, the top opening (i.e. an air outlet) is communicated with the steam valve cavity B, the bottom wall of the foam breaking cavity B1 is formed into a rolling inclined wall 21 which is inclined upwards, and the rolling body 1 arranged in the foam breaking cavity B1 can roll upwards along the rolling inclined wall 21 under the pushing of steam entering from the steam inlet 101 or roll downwards under the action of self gravity, namely the rolling body 1 can slide up and down along the rolling inclined wall 21 in a reciprocating manner.

In the cooking process of cooking appliances such as electric rice cookers, electric pressure cookers and the like, a large amount of bubbles can be formed in the steam valve due to the fact that water is evaporated in a large amount, and therefore the taste of food is affected. When steam in the inner pot (or called inner container) carries soup into the steam valve, the bubble breaking structure inside can break bubbles in a rotating and vibrating mode and the like, so that separation of steam and soup is promoted, and soup in the inner pot is prevented from overflowing into cooking appliances such as electric rice cookers.

As shown in fig. 1 and 2, when the electric cooker works, steam and big and small foam of the inner pot enter the foam breaking steam valve from the steam inlet 101, and when the steam pressure of the inner pot is high, the rolling bodies 1 can be pushed to the top end of the foam breaking cavity B1. At this time, the steam and the large foam enter the steam valve chamber B through the circumferential gap (including the lateral gap J1 and the vertical gap J2 of fig. 3) between the rolling element 1 and the foam breaking chamber peripheral wall 2, and finally escape outwards through the steam outlet 201 on the steam valve cover 200. In the process of passing through the circumferential gap, certain pressure drop exists in the steam pressure, so that the pressure of the inner pot is slightly higher than the external pressure, namely the micro pressure exists, and the steam pressure is favorable for cooking rice. Meanwhile, the large foam passes through the circumferential gap to be split into a plurality of small foams, the small foams are broken in the steam valve cavity B with larger volume and reduced pressure, accumulated water is formed to flow back from the bottom wall 102 of the steam valve seat, the circumferential gap formed between the rolling body and the peripheral wall of the foam breaking cavity is beneficial to breaking foam, the gap design can effectively control the steam pressure of the inner pot, the inner pot is kept in a micro-pressure state, and the cooked rice has better taste. In the cooking process, along with the gradual decrease of firepower control and moisture, the steam pressure of the inner pot is unstable, the rolling bodies 1 also slide downwards along the rolling inclined walls 21, large foam is continuously extruded in the process of up-and-down reciprocating rolling of the rolling bodies 1, and accumulated water formed directly flows back along the rolling inclined walls 21. Wherein the steam path is seen in each sectional view as a curve from the steam inlet 101 to the steam outlet 201.

Referring to the stress analysis of fig. 4, the gravity of the rolling element 1 is G, the gravity G is vertically downward, and the inclination angle of the rolling inclined wall 21 is a, which can be known as: the downward pushing component f2=g×sin (a) of gravity, and the upward pushing force f1=f2+f of steam is derived from the stress balance along the inclined plane, where F is the friction of the inclined plane. When the acting area of the steam on the rolling element 1 is S, the rolling inclined wall 21 and the rolling element 1 each have a smooth surface so that the friction force f is negligible, it can be deduced that the pressure difference value P between the steam pressure at the bottom and the steam pressure at the top of the foam breaking cavity B1 should satisfy:

in other words, when the pressure difference P of the air pressure of the chambers on the upper and lower sides of the rolling element 1 is large enough, that is, when the steam pressure of the inner pot of the electric cooker is in a micro-pressure state relative to the external standard air pressure, the rolling element 1 can be pushed upwards, so as to maintain a good foam breaking effect.

In the embodiment shown in fig. 3, the rolling elements 1 are cylindrical rollers arranged transversely to the rolling inclined wall 21, the diameter of the rollers being D and the axial length being L, the area of action of the steam on the rolling elements 1 being s=d×l; and is also provided with

The bubble breaking cavity B1 has a rectangular cross section with a width A1 and a length A2, and the cross section area s1=a1×a2-d×l of the circumferential gap.

Of course, the bubble breaking chamber is not limited to a rectangular chamber, the rolling element 1 is not limited to a roller, and the calculation formula of the action area S can be obtained in other shapes.

As can be seen from the above force analysis and calculation, the magnitude of P depends on a plurality of parameters such as the gravity of the rolling element 1, the force bearing area, and the inclination angle a. At the same time, the size of P is also limited by the size of the breaking cavity. In other words, by selectively controlling the above parameters, the steam pressure of the inner pot can be adjusted and controlled to obtain the optimum steam pressure for cooking rice.

Similarly, in order to achieve miniaturization of the bubble breaking steam valve, the gravity G of the rolling element 1 satisfies:

wherein P isThe pressure difference value between the steam pressure at the bottom and the steam pressure at the top of the foam breaking cavity B1 is preferably 50-300 pa; s is the acting area of the steam acting on the rolling element 1, and the value range is preferably 90-180 mm ² A is an inclined angle of the rolling inclined wall 21 with respect to a horizontal plane, and the value range is preferably 5 ° to 30 °.

Therefore, when the optimal design ranges of parameters such as the pressure difference value P (namely the pressure in the cooker), the size of the roller, the inclination angle a and the like are given, the weight of the roller can be calculated, so that materials can be selected conveniently, and the foam breaking steam valve which is compact in structure, small in size and applicable is realized.

According to the continuous experimental summary, when the pressure difference value P is preferably 50-300 pa, the micro pressure in the pot can be realized, the rolling body 1 can move upwards under the micro pressure to realize the foam breaking effect, and the rice soup is easy to flow back.

In a specific embodiment, more preferably, P ranges from 100pa to 200pa. If the differential pressure value p=100 Pa, the track inclination included angle a=18°, s=120 mm ² The gravity G of the roller is approximately equal to 3.96G, the whole weight is 4G, the density of the roller can be calculated according to the density formula rho=m/V=9.8N/kg, and further the material selection is considered.

In addition, the foam breaking cavity is relatively small, so that the circumferential gap is small enough to raise the internal pressure, and the steam valve cavity B is large enough compared with the foam breaking cavity B1, so that the pressure drop of the circumferential gap is maintained, and the small foam is more convenient to break completely. As an example, in the illustrated embodiment, the volume ratio of the steam valve chamber B to the bubble breaking chamber B1 is preferably not less than 5, but is not limited thereto.

When the area of action S of the steam on the rolling elements 1 is preferably 90 to 180 square millimeters, the weight G of the rolling elements 1 is preferably 2 to 8 grams. Further, the cross-sectional area S1 of the circumferential gap is preferably 50 to 100 square millimeters. For example, if the diameter d=12 mm, the axial length l=10 mm, the gravity g=4g, and the inclination angle a=18°, then p=f1/s≡ 100.9455pa. At this time, according to the reasonable parameter range, the pressure difference requirement can be met, the foam breaking steam valve can be miniaturized, large foam is effectively destroyed, and the backflow of rice soup is facilitated.

In order to achieve the above circumferential clearance, referring to fig. 3, the outer peripheral wall of the roller (the perspective view of which is shown in fig. 6) may be further formed with circular ribs 14, and the top wall and the bottom wall of the foam breaking cavity B1 are respectively formed with a top wall guide groove and a bottom wall guide groove as shown in fig. 3, respectively, and when the roller rolls along the rolling inclined wall 21, the circular ribs 14 are embedded into the top wall guide groove and the bottom wall guide groove to guide sliding; the transverse gaps J1 are formed between the outer peripheral surface of the roller and the top wall surface and the bottom wall surface of the foam breaking cavity B1, so that the friction area and the friction force can be reduced relative to the whole outer peripheral wall of the roller and the full contact of the bottom wall surface of the foam breaking cavity B1.

To form the lateral gap J1, it is naturally conceivable to set the raised height of the circular bead 14 to be larger than the depth of the top wall guide groove or the bottom wall guide groove, thereby forming the lateral gap J1. However, when the roller contacts the bottom wall of the foam breaking cavity only through the circular bead 14, the roller is easy to run unstably. In order to further increase the stability of the roller during operation, as shown in fig. 3, two sides of the bottom wall guide groove may be respectively formed with sidewall protrusions protruding upward, and the outer peripheral wall of the roller is supported on the two sidewall protrusions, thereby improving the stability of the roller during operation. After the two side wall protrusions are arranged, the protrusion height of the circular bead 14 can be further made smaller than the depth of the bottom wall guide groove, namely, the circular bead 14 is prevented from contacting the bottom surface of the bottom wall guide groove, and the contact area is further reduced.

Referring to fig. 8 and 15, the two circumferential ends of the roller may also respectively extend out of the guide posts 13, and the side walls 22 of the foam breaking cavities at two sides of the foam breaking cavity B1 are respectively formed with side wall guide grooves 221 parallel to the rolling inclined walls 21, referring to fig. 5 and 6, the guide posts 13 extend into the side wall guide grooves 221 to guide the moving rolling bodies 1; the circumferential gap further includes a vertical gap J2, and the depth of the sidewall guide groove 221 is smaller than the extending length of the guide post 13, so that the vertical gap J2 is formed between the end surface of the roller and the foam breaking cavity sidewall 22 of the foam breaking cavity B1. The design of the circular bead 14, the guide post 13 and the corresponding guide grooves is not only beneficial to the up-and-down reciprocating sliding of the rolling body 1, reduces the assistance and has accurate guiding, but also ensures that the rolling body 1 always moves along the same track without deflection, the size of the circumferential gap always keeps stable, and the reliability of the deduced differential pressure value P is high.

Since the rolling element 1 is extended with the guide post 13, and the side wall 221 of the foam breaking cavity is formed with the side wall guide groove 221 parallel to the rolling inclined wall 21, the rolling element 1 can be guided to move, and the running stability of the rolling element 1 is improved through the cooperation of the guide post and the guide groove.

Specifically, the width of the sidewall guide 221 should be greater than the diameter of the guide post 13 so that a clearance fit is formed between the guide post 13 and the sidewall guide 221. Preferably, the depth of the sidewall guide 221 should also be smaller than the extension of the guide post 13, so that a gap is formed between the rolling element 1 and the foam breaking cavity sidewall 22. Therefore, the reciprocating movement of the rolling bodies is not influenced by the clearance fit between the guide posts and the guide grooves and the clearance fit between the rolling bodies and the side walls.

In fig. 5 and 6, the sidewall guide 221 is formed recessed inward from the surface of the foam breaking chamber sidewall 22. Alternatively, however, the bubble breaking chamber side walls 22 may be protruded with a guide groove top plate and a guide groove bottom plate (not shown) which are spaced apart in parallel and are inclined in parallel with the rolling inclined wall 21, and the side wall guide groove 221 is formed between the guide groove top plate and the guide groove bottom plate. In fig. 5 and 6, the sidewall guide 221 preferably does not extend downward to the bottom end opening of the foam breaking cavity B1, i.e. has a bottom end wall that forms a downward limit for the guide post 13, and by limiting downward the body of the rolling element 1 or the guide post 13, the rolling element 1 is blocked from sliding out of the bottom end opening of the foam breaking cavity B1, similar to the function of the rolling gear structure 3 formed by extending downward and inward the steam valve inner sidewall 103 shown in fig. 2, 7, 9, etc. The upward limit of the guide post 13 is the same as described below. However, when the side wall guide groove 221 is formed by the protruding guide groove top plate and the guide groove bottom plate, it is necessary to add a limit structure of the guide post 13 particularly at both ends of the guide groove.

In the embodiments shown in all the figures, the rolling bodies 1 are preferably cylindrical rollers, but the rolling bodies 1 may also be other balls, for example spherical balls or the like. When used as a ball, the guide post 13 may extend in the radial direction of the ball. When the two cylindrical guide posts 13 are used as rollers, the two cylindrical guide posts can respectively extend along the two axial ends of the rollers and respectively extend into the side wall guide grooves 221 of the side walls 22 of the foam breaking cavity B1 at the two sides of the foam breaking cavity.

In addition, limit rib plates 223 extending toward the corresponding axial end surfaces of the rollers are respectively formed on the foam breaking cavity side walls 22 on both sides of the foam breaking cavity B1, as shown in fig. 7 and 8. When the width of the sidewall guide groove 221 is large and the diameter of the roller 13 is relatively small, the rolling element 1 is easy to deflect, and the limiting rib plates 223 limit the axial end surfaces of the two ends of the rolling element body respectively, so that the inclination offset degree of the rolling element 1 relative to the central axis of the rolling element body can be effectively limited. Specifically, in the present embodiment, a gap of 1mm to 4mm is formed between the rolling element 1 and the foam breaking cavity side wall 22, and the spacing rib 223 is preferably 0.5mm to 1mm from the rolling element 1. When the gap between the rolling body 1 and the foam breaking cavity side wall 22 is larger, the spacing rib plates 223 with smaller distance with the rollers are arranged, so that the phenomenon that the rollers deviate from the grooves due to uneven stress in the rolling process can be effectively prevented. As also shown in fig. 7 and 8, the stopper rib 223 is preferably located on the foam breaking cavity sidewall 22 substantially flush with the height of the highest surface of the roller, so that friction with the rolling element 1 during movement of the rolling element 1 can be reduced to prevent the movement of the rolling element 1 from being hindered while ensuring that the roller does not deviate.

To achieve the upward limit of the guide post 13, similar to the downward limit, the top end of the sidewall guide groove 221 is formed with an upward limit rib 222, as shown in fig. 5. The side wall guide 221 may not extend upwardly to the top end opening of the bubble breaking chamber B1, i.e., have a top end wall for upward limitation, as shown in fig. 6 and 7, and the top end wall serves as an upward limitation rib 222.

However, unlike in fig. 5, the sidewall guide 221 extends upward to a top end opening penetrating the foam breaking cavity B1 so that the rolling bodies 1 are embedded downward into the foam breaking cavity B1 from the top end opening to facilitate assembly. Thus, in fig. 5, the upward limit rib 222 is convexly formed in the top end groove of the sidewall guide groove 221. At this time, the side wall of the foam breaking cavity is usually made of plastic material, and is deformed under the action of external force, so that the guide post 13 can slide into the side wall guide groove 221 by pressing over the upward limit rib 222 during installation.

Referring to fig. 5, the front end surface of the upward-limiting bead 222 facing the steam valve chamber B is also preferably formed with a mounting slope 224, and the mounting slope 224 is inclined from the top end opening toward the bottom end opening of the foam breaking chamber B1, so that the guide post 13 can slide down the mounting slope 224 over the upward-limiting bead 222 into the side wall guide groove 221 when the rolling element 1 is fitted into the foam breaking chamber B1 from the top end opening of the foam breaking chamber B1. The provision of the mounting ramps 224 further facilitates insertion of the guide posts 13 into the side wall guide slots 221.

In addition, the top wall of the bubble breaking cavity B1 may be a fixed cover plate, but may also be preferably a bubble breaking rail cover 23, and the bubble breaking rail cover 23 is detachably connected to the inner side wall 103 of the bubble breaking steam valve, for example, by a respective well-known pivot structure, which is not described in detail herein. The pivotable mounting of the foam breaking rail cover 23 facilitates the assembly of the rolling bodies 1 and cleaning after use. Specifically, a guide pillar mounting groove (not shown) extending downward from the sidewall guide groove 221 toward the foam breaking rail cover 23 may be further provided on the foam breaking cavity sidewall 22 of the foam breaking cavity B1. When the rolling element 1 is assembled, the bubble breaking track cover 23 is pivoted and opened, the guide posts 13 at the two ends of the rolling element 1 are arranged on the Ji Daozhu mounting grooves, then the guide posts 13 are pressed downwards, and the guide posts 13 can slide into the side wall guide grooves 221 along the guide post mounting grooves. Similarly, after use, the rolling elements 1 can be reversely taken out to clean the foam breaking cavity B1.

The upper and lower limits on the guide post 13 are explained above. Similarly, the rolling body should be limited reasonably up and down, especially when the guide post 13 is not provided or the guide post 13 is damaged, double guarantee can be provided by limiting the rolling body reasonably up and down, the use reliability of the steam valve is improved, and the rolling body is prevented from sliding out.

When the rolling body is limited downwards, the rolling gear structure 3 formed by extending the inner side wall 103 of the steam valve into the bottom end opening of the foam breaking cavity B1 is shown in each embodiment shown in fig. 2, 7, 9, 11 and 13, and the rolling gear structure 3 can effectively prevent the rolling body 1 from sliding out of the bottom end opening of the foam breaking cavity B1 and does not influence steam to enter the foam breaking cavity B1.

Fig. 9 to 14 show three forms of the shutter 4 and its mounting structure to achieve upward limitation of the rolling body. The baffle 4 is arranged in the steam valve cavity B and close to the top end opening of the foam breaking cavity B1 so as to prevent the rolling bodies 1 from sliding upwards out of the foam breaking cavity B1.

In the first embodiment of fig. 9 and 10, the baffle 4 preferably protrudes directly upward from the bottom wall of the steam valve chamber B (i.e., the bottom wall 102 of the steam valve seat), which structure allows steam to flow upward from the gap between the top end of the baffle 4 and the top wall of the bubble breaking chamber B1, facilitating the flow of steam toward the upward steam outlet 201.

The baffle 4 may be elongated in various shapes, or may be a flat plate arranged in the width direction of the rolling inclined wall 21. Of course, when the long and thin ribs are adopted, the back flow of accumulated liquid such as rice soup on the bottom wall 102 of the steam valve seat is more facilitated. The rolling body can be more reliably prevented from sliding out by adopting the flat plate shape.

Whether the rolling elements 1 are cylindrical rollers or spherical balls, the minimum distance H between the tips of the baffles 4 and the foam breaking track cover 23 should be smaller than the diameter D of the rolling elements 1. In other words, the baffle 4 should have a certain height and the distance from the foam breaking track cover 23 should not be too large, so that the rolling element 1 cannot slide out from above the baffle 4, ensuring that the sliding track of the rolling element 1 is normal and not separated from the track, as shown in fig. 9.

As described above, the bottom end of the foam breaking track cover 23 is detachably pivotally connected to the inner sidewall 103 of the foam breaking steam valve or detachably connected to the sidewall of the foam breaking cavity, and the foam breaking track cover 23 needs to be pulled upwards to be opened when cleaning after assembling or using. For this purpose, the minimum distance H between the tip of the flap 4 and the foam breaking rail cover 23 should be sized for finger insertion, i.e. the minimum distance H should be greater than the finger thickness. In the present embodiment, the minimum pitch H is not less than 8mm, i.e., is greater than the fingertip thickness of most of the fingers, so that the fingertips can be inserted into the gap of the minimum pitch H to be snapped upward to open the top wall of the bubble breaking cavity peripheral wall 2 (i.e., the bubble breaking track cover 23). Such as the bottom end of the bubble breaking track cover 23, is pivotally connected to the inner sidewall 103 of the bubble breaking steam valve.

Of course, the minimum distance H between the baffle 4 and the foam breaking chamber side wall 22 of the foam breaking chamber B1 should also be smaller than the diameter D of the rolling element 1, so that the rolling element cannot slip out of both lateral sides of the baffle 4 either. In other words, if the baffle 4 is a flat plate extending in the lateral direction, the baffle 4 needs to have a certain width. If the baffle 4 is an elongated rib, a plurality of baffle plates may be arranged at intervals in the lateral direction of the rolling inclined wall 21.

The foam breaking steam valve shown in fig. 9 and 10 includes a steam valve cover 200 and a steam valve seat 100, a steam valve cavity B is formed between the steam valve cover 200 and the steam valve seat 100, a steam outlet 201 is formed in the steam valve cover 200, and a steam inlet 101 is formed in a bottom wall 102 of the steam valve seat. In order to increase the fastening tightness between the steam valve cover 200 and the steam valve seat 100 and prevent steam from escaping from the joint edge of the steam valve cover 200 and the steam valve seat 100, a sealing ring 300 is further arranged between the steam valve cover 200 and the steam valve seat 100. At this time, when the baffle 4 directly protrudes upward from the bottom wall 102 of the steam valve seat, the baffle 4 may be preferably integrally formed with the bottom wall 102 of the steam valve seat, so that the manufacturing is facilitated. Of course, the structure of the attachment of the flap 4 is not limited to an integrally formed structure such as a cast, and may be formed by other means such as ultrasonic fusion welding.

When the bubble breaking steam valve is formed by buckling the steam valve cover 200 with the steam valve seat 100, the bottom end of the bubble breaking track cover 23 is preferably pivotally connected, and the rolling inclined wall 21 is preferably a downward inclined part of the bottom wall of the steam valve cavity B, the rolling inclined wall 21 extends to the steam inlet 101, and the accumulated liquid (including condensed water and rice soup formed by bursting of foam) of the bottom wall of the steam valve cavity B can smoothly flow out of the steam inlet 101 downwards and timely through the rolling inclined wall 21.

Furthermore, at the top end opening of the breaking cavity B1, a baffle 4 may also protrude from the breaking cavity peripheral wall 2 to block the rolling bodies 1 from sliding out of the breaking cavity B1. Thus, the back flow of the liquid accumulation on the surface of the bottom wall 102 of the steam valve seat is facilitated compared to the form of the baffle 4 protruding upward from the bottom wall 102 of the steam valve seat in fig. 9.

Likewise, the baffle 4 may be an elongated rib as described above or a flat plate arranged in the width direction of the rolling inclined wall 21.

In the second embodiment of fig. 11 and 12, the baffle 4 protrudes downwards from the top end of the top wall of the breaking cavity B1 towards the rolling inclined wall 21. The separation blade 4 is suspension form like this, has the interval between separation blade and the broken bubble chamber diapire, and the separation blade can not prevent the rice water from flowing back from broken bubble chamber's diapire like this.

Similarly, to effectively prevent the rolling body from sliding upward out of the foam breaking cavity B1, the minimum distance H between the bottom end of the baffle plate 4 and the rolling inclined wall 21 should be smaller than the diameter D of the rolling body 1 no matter whether the rolling body 1 is a cylindrical roller or a spherical ball, so that the rolling body 1 cannot slide out substantially from below the baffle plate 4.

As in the embodiment shown in fig. 9 and 10, the minimum distance H between the baffle 4 and the foam breaking chamber side wall 22 of the foam breaking chamber B1 in fig. 11 and 12 should also be smaller than the diameter D of the rolling elements 1. I.e. the width of the barrier 4 is limited such that the rolling body bodies cannot slide out from the sides of the barrier 4 either.

In the third embodiment of fig. 13 and 14, the baffle 4 extends laterally from the foam breaking cavity side wall 22 of the foam breaking cavity B1.

In fig. 13 and 14, the baffle 4 extending transversely from the side wall 22 of the frothing chamber is also preferably suspended, which baffle likewise does not prevent the back flow of rice water from the bottom wall of the frothing chamber.

The baffle 4 in the figures is preferably T-shaped and may include a longitudinal extension extending forwardly from the top end of the foam breaking cavity side wall 22 and a transverse extension extending laterally inwardly from the distal end of the longitudinal extension.

It should be noted that, under repeated impact, the barrier 4 is mainly used to limit the rolling element 1 upwards, and in order to avoid damage, the contact portion between the barrier 4 and the rolling element 1 may preferably have a buffer, preferably an elastic buffer, for example, a flexible material layer is formed on the outer periphery of the rolling element 1 to reduce the impact force to the barrier 4, or the impact surface of the barrier 4 has an elastic layer, etc.

Whether the rolling elements 1 are cylindrical rollers or spherical balls, or any other suitable rolling element shape, the rolling elements 1 may preferably comprise an inner core layer 11 of relatively large mass and an outer cover layer 12 of relatively small mass, the outer cover layer 12 being a layer of flexible material, see fig. 15-19. Thus, the inner core layer 11 has large mass, is convenient for rolling and breaking bubbles, and the outer cover layer 12 is made of flexible materials, so that the noise generated during rolling can be reduced, the impact force of the rolling body 1 during rolling is reduced, and the self abrasion is also reduced.

The inner core layer 11 is preferably a hard material such as metal. The metal hard material has large mass, large density and small volume, and is suitable for the miniaturization requirement of the foam breaking steam valve. For example, in various embodiments of the present invention, the inner core layer 11 is preferably made of food grade stainless steel, stainless iron, or aluminum materials, etc., which are not prone to rust.

The outer cover 12 is preferably a layer of adhesive, such as a layer of silicone, rubber or other elastomeric material, that is easy to attach and form, and the inner and outer layers are highly adherent and not easily peelable from each other.

When a silicone layer or a rubber layer is used, the outer cladding 12 may be formed on the outer surface of the inner core layer 11 by injection molding or compression molding. The rolling elements 1 in fig. 15 to 19 are cylindrical rollers, for example, and in order to perform injection molding or compression molding, the inner core layer 11 needs to be effectively clamped, and then the outer cladding layer 12 is manufactured.

For clamping of cylinders, for example, three-jaw chucks are common. At this time, as shown in fig. 15 and 19, the end of the roller is formed with three circumferential clamping notches 15 distributed at intervals in the circumferential direction, and the three circumferential clamping notches 15 penetrate the outer cladding 12 and expose the inner core 11 outward. The clamping surface of each jaw extends from the peripheral surface of the rolling element 1 to the end surface.

In addition, conventionally, the roller may be clamped in a centering manner, so that at least one axial clamping notch is formed at each of the two ends of the axis of the roller, and the axial clamping notch penetrates through the outer cladding 12 and exposes the inner core 11 outwards.

The rollers shown in fig. 15 have guide posts 13 protruding from both axial ends thereof, respectively, while the rollers shown in fig. 16 to 19 have no guide post 13 but have circular ribs 14.

However, when the guide post 13 is extended, the side wall 221 of the foam breaking cavity is formed on the side wall 22 of the foam breaking cavity B1 parallel to the rolling inclined wall 21, and in order to reduce abrasion of the guide post and the guide groove, the guide post 13 and the outer cladding 12 are preferably integrally formed, that is, the guide post 13 is also made of flexible materials.

The outer circumferential surface of the inner core layer 11 as a cylinder may be formed with circular beads 14, and the circular beads 14 are covered with the outer cladding layer 12, so that friction of the circular beads 14 is reduced. Of course, the annular rib 14 may be formed integrally with the outer cladding 12, similar to the guide post 13, see fig. 17.

In addition, when the rolling gear structure 3 is provided at the bottom end opening of the foam breaking cavity B1, the rolling element 1 contacts the rolling gear structure 3 through the outer cladding 12 when the rolling element 1 rolls reciprocally along the rolling inclined wall 21. The arrangement of the outer cladding 12 considerably slows down the repeated impact of the rolling element 1 on the rolling gear structure 3. Of course, the surface of the rolling gear structure 3 may also be provided with a buffer layer.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, any modification, equivalent replacement, improvement, etc. may be made within the spirit and principle of the present invention, for example, the guide post 13 may also extend from only one end face of the rolling element 1, the guide post 13 is not limited to completely adopting the flexible material, the inner post may have a metal inner core and the outer layer of the flexible material is covered by the outer layer, the steam inlet 101 and the bottom end opening of the foam breaking cavity B1 may be combined together, etc., and such modifications are included in the protection scope of the present invention.

In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.

Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (10)

1. The utility model provides a broken bubble steam valve is equipped with broken bubble structure in this broken bubble steam valve's steam valve pocket (B), broken bubble structure includes rolling element (1) and broken bubble chamber (B1), broken bubble chamber has steam inlet and steam outlet, the diapire in broken bubble chamber (B1) forms into slope ascending roll hang wall (21), the built-in broken bubble chamber (B1) rolling element (1) can follow under the steam promotion that the steam inlet got into roll hang wall (21) upwards roll or roll downwards under self gravity effect to satisfy:

wherein G is the weight of the rolling element (1);is the pressure difference between the steam pressure at the bottom and the steam pressure at the top of the foam breaking cavity (B1), and +.>=50 to 300pa; s is the acting area of the steam on the rolling bodies (1), S=90-180 mm, a is the inclined angle of the rolling inclined wall (21) relative to the horizontal plane, and a=5-30 degrees;

a circumferential gap is formed between the rolling body (1) and the peripheral wall (2) of the foam breaking cavity;

a circular bead (14) is formed on the peripheral wall of the rolling body (1), a top wall guide groove and a bottom wall guide groove are respectively formed on the top wall and the bottom wall of the foam breaking cavity (B1) correspondingly, and when the rolling body (1) rolls along the rolling inclined wall (21), the circular bead (14) is embedded into the top wall guide groove and the bottom wall guide groove to guide and slide;

wherein a transverse gap (J1) is formed between the outer peripheral surface of the rolling body (1) and the top wall surface and the bottom wall surface of the foam breaking cavity (B1);

guide posts (13) extend out of two circumferential ends of the rolling body respectively, side wall guide grooves (221) parallel to the rolling inclined wall (21) are formed on two side wall (22) of the foam breaking cavity (B1) respectively, the guide posts (13) extend into the side wall guide grooves (221) to guide and move the rolling body (1), and the width of the side wall guide grooves (221) is larger than the diameter of the guide posts (13), so that clearance fit is formed between the guide posts (13) and the side wall guide grooves (221);

the circumferential gap further comprises a vertical gap (J2), and the depth of the side wall guide groove (221) is smaller than the extending length of the guide post (13), so that the vertical gap (J2) is formed between the end face of the rolling body (1) and the foam breaking cavity side wall (22) of the foam breaking cavity (B1).

2. The bubble-breaking steam valve according to claim 1, wherein the differential pressure valueThe range of (2) is 100 pa-200 pa.

3. A bubble breaking steam valve according to claim 1, wherein the rolling inclined wall (21) and the rolling body (1) each have a smooth surface.

4. The bubble breaking steam valve according to claim 1, wherein a volume ratio of the steam valve chamber (B) to the bubble breaking chamber (B1) is not less than 5.

5. The bubble-breaking steam valve according to any one of claims 1 to 4, wherein the cross-sectional area S1 of the circumferential gap is 50 to 100 square millimeters.

6. The foam breaking steam valve according to any one of claims 1 to 4, wherein a circumferential gap of 0.5 to 4mm is formed between the rolling element (1) and the foam breaking cavity peripheral wall (2).

7. A bubble breaking steam valve according to claim 5, wherein the rolling bodies (1) are cylindrical rollers arranged transversely to the rolling inclined wall (21), the rollers having a diameter D and an axial length L, the area of action of the steam on the rolling bodies (1) S = D x L;

and is also provided with

The foam breaking cavity (B1) has a rectangular cross section, the width of the rectangular cross section is A1, the length of the rectangular cross section is A2, and the cross section area S1=A1×A2-D×L of the circumferential gap.

8. The bubble-breaking steam valve according to claim 7, wherein both sides of the bottom wall guide groove are respectively formed with upwardly protruding side wall projections, the outer peripheral wall of the roller is supported on both of the side wall projections, and the projection height of the circular bead (14) is smaller than the depth of the bottom wall guide groove.

9. The bubble breaking steam valve according to claim 1, wherein the bubble breaking steam valve comprises a steam valve cover (200) and a steam valve seat (100), the steam valve cover (200) and the steam valve seat (100) being connected to each other to form the steam valve cavity, the bubble breaking cavity (B1) comprising a bubble breaking track cover (23) and a bubble breaking cavity side wall (22) provided on the steam valve seat (100), the bubble breaking track cover (23) being detachably connected to the bubble breaking cavity side wall (22).

10. An electric cooker, wherein a cover of the electric cooker is provided with the bubble breaking steam valve according to any one of claims 1 to 9.