CN107019422B

CN107019422B - Stepless pressure regulating valve and foam breaking device

Info

Publication number: CN107019422B
Application number: CN201710368153.5A
Authority: CN
Inventors: 夏金生
Original assignee: Foshan Imibar Technology Co ltd
Current assignee: Foshan Imibar Technology Co ltd
Priority date: 2017-05-23
Filing date: 2017-05-23
Publication date: 2022-07-19
Anticipated expiration: 2037-05-23
Also published as: CN107019422A

Abstract

The invention relates to a stepless pressure regulating valve and a foam breaker. The stepless pressure regulating valve comprises a power device, a box body, a pressing device and a limiting device, wherein an air inlet is formed in the box body, the power device comprises a rotation driving mechanism, a cam and a cam sleeve, the pressing device comprises a pull rod upper beam, a pull rod lower beam and a spring, the pull rod upper beam is connected with the cam sleeve, and the spring sleeve is arranged on the pull rod upper beam and is positioned between the pull rod lower beam and the limiting device. The stepless pressure regulating valve can control the speed of reducing the air pressure and realize stepless dynamic pressure regulation; has the function of safety protection. The bubble breaker uses any one of the stepless pressure regulating valves, the box body is provided with a first interface and a second interface which are communicated with the inner cavity of the box body, the first interface is used for being connected with a water inlet valve assembly, and the second interface is used for being connected with a pipe fitting; the air pressure can be controlled, and the safety is high; the water inlet valve assembly can facilitate the cleaning of the bubble breaker.

Description

Stepless pressure regulating valve and foam breaking device

Technical Field

The invention relates to the field of pressure control mechanisms, in particular to a stepless pressure regulating valve and a foam breaker.

Background

The conventional pressure control mechanism usually uses a driving mechanism to push or attract a steel ball or other similar objects to open or close the exhaust hole, so as to realize the control of pressurization and depressurization. The conventional pressure control mechanism can only realize one-stage or several-stage pressure control, and after pressure reduction, because the exhaust hole is large, the pressure reduction is rapid, and the control of the exhaust cannot be realized.

Traditional pressure electric rice cooker or pressure cooker etc. cooking utensil's bubble breaker comprises a set of clear mechanism and a set of actuating mechanism of dismantling usually, can clean the mechanism and include pressure ball mechanism and relief valve mechanism, simultaneously for reaching better broken bubble effect, the space of bubble breaker is cut into a plurality of air flues by a lot of thin wall structure, and the user uses up electric rice cooker after, need manual dismantlement get off cleanly because the dead angle is many, and cleaning work is very troublesome. Meanwhile, a driving mechanism is used for pushing or attracting a steel ball or other similar objects to open or close the drainage exhaust pipe to realize the control of pressurization and decompression, the mechanism can only realize pressure control of one section or a plurality of sections generally, after decompression, because the exhaust hole is large, decompression is rapid, and further the temperature in the cooking appliance is rapidly reduced to be lower than the target cooking temperature, because the cooking time in the target cooking temperature does not reach the standard, the cooking and the taste of food are influenced.

Disclosure of Invention

In view of the above, it is necessary to provide a stepless pressure regulating valve capable of realizing stepless dynamic pressure regulation in order to solve the problem of difficulty in pressure control.

A stepless pressure regulating valve. The stepless pressure regulating valve comprises a power device, a box body, a pressing device and a limiting device, wherein an air inlet is formed in the box body, the power device comprises a rotary driving mechanism, a cam and a cam sleeve, the rotary driving mechanism is connected with the cam, the cam sleeve is arranged on the cam, the pressing device comprises a pull rod upper beam, a pull rod lower beam and a spring, the pull rod upper beam is fixedly connected with the pull rod lower beam, the pull rod upper beam is connected with the cam sleeve, the diameter of the pull rod upper beam is smaller than that of the pull rod lower beam, the limiting device is arranged on the pull rod upper beam in a sleeved mode and used for limiting the pull rod upper beam, the spring sleeve is arranged on the pull rod upper beam and located between the pull rod lower beam and the limiting device, and the pull rod lower beam is used for plugging or opening the air inlet.

The stepless pressure regulating valve consists of a rotation driving mechanism, a cam and a cam sleeve through a power device, the cam sleeve is sleeved on the cam, and the cam sleeve can ascend or descend along with the rotation of the cam; the spring is sleeved on the upper beam of the pull rod and arranged between the lower beam of the pull rod and the limiting device, when the rotation driving mechanism does not work, the spring applies an elastic force to the lower beam of the pull rod to enable the lower beam of the pull rod to plug an air inlet of the box body, when the rotation driving mechanism works, the spring overcomes the elastic force of the spring to lift the pressing device, and meanwhile, the rotation driving mechanism can be controlled to drive the angle of the cam to rotate according to needs so as to control the speed of air pressure reduction, so that stepless dynamic pressure regulation is realized; meanwhile, when the rotary driving mechanism is in a non-working state, the air inlet of the box body is blocked by the elastic force of the spring, so that the lower beam of the pull rod opens the air inlet when the thrust generated by air pressure is greater than the elastic force of the spring, and the rotary driving mechanism has a safety protection function.

The above technical solution is further explained as follows:

in one embodiment, the pull rod box further comprises a sealing element, the sealing element is arranged in the box body, the sealing element is sleeved on the lower pull rod beam and connected with the lower pull rod beam, and the connection position of the sealing element and the lower pull rod beam is located at one end, far away from the upper pull rod beam, of the lower pull rod beam. The setting of sealing member entangles the pull rod underbeam, avoids the pull rod underbeam and the air inlet exhaust air direct contact of box body, encloses into simultaneously open-ended sealing member is connected with the box body and can forms a partition region, avoids the part of sealing member upside and air inlet exhaust air direct contact, through this kind of mode increase of service time, also can protect the impurity pollution in the part is by the air inlet exhaust air simultaneously.

In one embodiment, the sealing element comprises a sealing part, a buffering part and a first connecting part, one end of the buffering part is connected with the sealing part, the other end of the buffering part is connected with the first connecting part, the buffering part is telescopic, the first connecting part, the buffering part and the sealing part form a cavity, the first connecting part is provided with an opening communicated with the cavity, the first connecting part is connected with the box body, and the sealing part is connected with the lower pull rod beam and is positioned at one end of the lower pull rod beam, which is far away from the upper pull rod beam. The sealing element is composed of a sealing part, a buffering part and a first connecting part, so that a protection area can be formed, the sealing part is connected with the lower beam of the pull rod, and the sealing part is directly used for plugging the air inlet of the box body when in use, so that the sealing effect is better; the buffer part is designed to be telescopic, so that the protection range of the sealing element can be wider.

In one embodiment, the pressing device further comprises a pressure plate, the pressure plate is fixedly connected with the lower pull rod beam and is located at one end, away from the upper pull rod beam, of the lower pull rod beam, and the sealing portion is connected with the pressure plate. The setting of pressure disk can be better the air inlet of shutoff box body, and area of contact is bigger, guarantees sealed effect.

In one embodiment, the limiting device comprises a pressing plate and a supporting plate, the pressing plate is sleeved on the upper beam of the pull rod, and the supporting plate is sleeved on the lower beam of the pull rod. The limiting device is provided with the pressing plate and the supporting plate, and the pressing device can be conveniently installed in the mode, so that the use is convenient.

In one embodiment, the pressing plate includes a first connecting plate, a first pressing member, and a first limiting portion, the first pressing member is fixedly connected to the first limiting portion through the first connecting plate, the first limiting portion is disposed inside the first pressing member, the first limiting portion is sleeved on the upper beam of the pull rod, the supporting plate includes a second connecting plate, a second pressing member, and a second limiting portion, the second pressing member is fixedly connected to the second limiting portion through the second connecting plate, the second pressing member is disposed corresponding to the first pressing member, the second limiting portion is disposed inside the second pressing member, and the second limiting portion is sleeved on the lower beam of the pull rod. The clamp plate includes first connecting plate, first pressing member and first spacing portion, can carry on spacingly to the pull rod upper beam through this kind of cooperation, and the backup pad includes second connecting plate, second pressing member and the spacing portion of second simultaneously, and the spacing portion of second can carry on spacingly to the pull rod underbeam, and second pressing member and first pressing member cooperation, first pressing member fix a position the second pressing member, and is simple to use.

In one of them embodiment, the box body includes the cover body, bearing plate and installation department, the cover body sets up on the bearing plate, be provided with the air inlet on the bearing plate, the installation department is fixed to be set up cover body inboard, stop device sets up in the installation department. The box body design is the cover body, bearing plate and installation department three, and the cover body is detachable with the bearing plate, and it is more convenient to use, and the setting of installation department can restrict stop device, and the use is more stable.

In one embodiment, the box body further comprises a sealing ring, and the sealing ring is arranged at the connecting position of the cover body and the bearing plate. The sealing ring is arranged to seal between the cover body and the bearing plate, so that air leakage is avoided, and the controllability of air pressure is ensured.

In one embodiment, the installation part comprises an installation groove and a positioning part, the installation groove is fixedly connected with the cover body, the positioning part is fixedly connected with the installation groove and is located at one end far away from the cover body, the limiting device is arranged in the installation groove, the sealing element is connected with the positioning part, and the limiting device and the installation part are matched to position the sealing element. The installation department includes that mounting groove and location portion can accomplish stop device spacing, sets up the installation that location portion can be convenient for the sealing member simultaneously, and it is more convenient to use.

In one embodiment, the box body is further provided with a water outlet, the water outlet and the water inlet of the box body are located on the same side, the water outlet further comprises a backflow cover, the backflow cover comprises an air inlet portion, a second connecting portion and a blocking portion, an air inlet channel is formed by communicating the air inlet portion, the second connecting portion and the blocking portion, one end of the second connecting portion is fixedly connected with the air inlet portion, the other end of the second connecting portion is fixedly connected with the blocking portion, the air inlet portion is located on the inner side of the box body, the blocking portion is located on the outer side of the box body, the box body which surrounds the air inlet is sleeved on the second connecting portion, and the blocking portion and the water outlet are correspondingly used for blocking or opening the water outlet. The arrangement of the water outlet and the backflow cover of the box body can enable the use of the stepless pressure regulating valve to be more stable, when water is accumulated in the box body and no air pressure exists in the box body, the water in the box body exerts external force on the blocking part and is discharged through the water outlet; when air pressure exists, external force is applied to the backflow cover by the air pressure, the water outlet on the box body is sealed by the sealing part, and air leakage is guaranteed through the mode.

In one embodiment, the power device further comprises a bracket, the bracket is fixedly arranged on the box body, and the rotation driving mechanism is fixedly arranged on the bracket. The support can be convenient for rotate actuating mechanism's installation, makes power device constitute wholly to use.

In one embodiment, the device further comprises a connecting piece, and the power device is connected with the pressing device through the connecting piece.

Based on the above, the invention also needs to provide a bubble breaker capable of realizing stepless dynamic pressure regulation.

A bubble breaker uses any one of the stepless pressure regulating valves, a first interface and a second interface which are communicated with an inner cavity of the box body are arranged on the box body, the first interface is used for being connected with a water inlet valve assembly, and the second interface is used for being connected with a pipe fitting.

The stepless pressure regulating valve is used as a component of the foam breaker, so that the air pressure can be controlled, the excessive air pressure is avoided, and the safety of the foam breaker is high; meanwhile, the bubble breaker can be conveniently cleaned by arranging the water inlet valve assembly, and the bubble breaker is more convenient to use; the air pressure is adjusted through the cooperation of the cam and the cam sleeve, the adjusting range is controllable, and the air pressure is released more stably.

Drawings

FIG. 1 is a first perspective view of a stepless pressure regulating valve;

FIG. 2 is a second perspective view of the stepless pressure regulating valve;

FIG. 3 is an exploded view of a stepless pressure regulating valve;

FIG. 4 is a top view of the stepless pressure regulating valve;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

FIG. 6 is a sectional view taken along line B-B of FIG. 4;

FIG. 7 is a cross-sectional view of a stepless pressure regulating valve;

FIG. 8 is a perspective view of the combination of the stop device and the sealing member;

FIG. 9 is a perspective view of the stop device and the seal element shown disassembled;

FIG. 10 is a sectional view of the spacing device and the sealing member shown disassembled;

FIG. 11 is a perspective view of the return cover;

FIG. 12 is a cross-sectional view of the reflow lid;

fig. 13 is a perspective view of the bubble breaker.

Wherein:

1. the power device comprises a power device, 11 a rotary driving mechanism, 12 a cam, 13 a cam sleeve and 14 a bracket;

2. the box body, 21 cover body, 22 bearing plate, 23 sealing ring, 24 mounting part, 241 mounting groove, 242 positioning part;

3. the pressing device comprises a pressing device, a pull rod upper beam, a pull rod lower beam, a spring and a pressure plate, wherein the pressing device comprises 31, 32, 33, 34 and 34;

4. a connecting member;

5. the pressing device comprises a limiting device, a pressing plate 51, a first connecting plate 511, a first pressing piece 512, a first limiting part 513, a supporting plate 52, a second connecting plate 521, a second pressing piece 522, a second limiting part 523;

6. sealing element, 61, sealing part, 62, buffer part, 63, first connecting part;

7. a backflow cover, 71, an air inlet part, 72, a second connecting part, 73, a blocking part;

8. a water inlet valve assembly;

9. a pipe fitting.

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements.

Referring to fig. 1, 2 and 3, an embodiment of the present invention discloses a stepless pressure regulating valve, which includes a power device 1, a box body 2, a pressing device 3 and a limiting device 5, an air inlet is disposed on the box body 2, the power device 1 includes a rotation driving mechanism 11, a cam 12 and a cam sleeve 13, the rotation driving mechanism 11 is connected with the cam 12, the cam sleeve 13 is sleeved on the cam 12, the pressing device 3 includes a pull rod upper beam 31, a pull rod lower beam 32 and a spring 33, the pull rod upper beam 31 is fixedly connected with the pull rod lower beam 32, the pull rod upper beam 31 is connected with the cam sleeve 13, the diameter of the pull rod upper beam 31 is smaller than that of the pull rod lower beam 32, the limiting device 5 is sleeved on the pull rod upper beam 31 for limiting the pull rod upper beam 31, the spring 33 is sleeved on the pull rod upper beam 31 and is located between the pull rod lower beam 32 and the limiting device 5, the lower tie rod beam 32 is used for blocking or opening the air inlet.

The stepless pressure regulating valve consists of a rotary driving mechanism 11, a cam 12 and a cam sleeve 13 through a power device 1, the cam 12 is sleeved with the cam sleeve 13, and the cam sleeve 13 can ascend or descend along with the rotation of the cam 12; the spring 33 is sleeved on the pull rod upper beam 31, the spring 33 is arranged between the pull rod lower beam 32 and the limiting device 5, when the rotation driving mechanism 11 does not work, the spring 33 applies an elastic force to the pull rod lower beam 32 to enable the pull rod lower beam 32 to plug the air inlet of the box body 2, when the rotation driving mechanism 11 works, the pressing device 3 is lifted by overcoming the elastic force of the spring 33, and meanwhile, the angle of the rotation driving mechanism 11 for driving the cam 12 to rotate can be controlled according to needs so as to control the speed of air pressure reduction, and stepless dynamic pressure regulation is realized; meanwhile, when the rotation driving mechanism 11 is in a non-working state, the air inlet of the box body 2 is blocked by the elastic force of the spring 33, so that the lower pull rod beam 32 opens the air inlet when the thrust generated by air pressure is greater than the elastic force of the spring 33, and the safety protection function is achieved.

Alternatively, the rotation drive mechanism 11 is a motor.

Referring to fig. 3 and 5, optionally, one end of the spring 33 is in contact with the pull rod lower beam 32, and the other end is in contact with the limiting device 5, and the spring 33 is in a compressed state.

Referring to fig. 3 and 5, optionally, the pull rod box further comprises a sealing element 6, the sealing element 6 is disposed in the box body 2, the sealing element 6 is sleeved on the pull rod lower beam 32 and is connected with the pull rod lower beam 32, and a connection position of the sealing element 6 and the pull rod lower beam 32 is located at one end of the pull rod lower beam 32, which is far away from the pull rod upper beam 31. The setting of sealing member 6 entangles the pull rod underbeam 32, avoids pull rod underbeam 32 and the exhaust air direct contact of air inlet of box body 2, encloses into simultaneously open-ended sealing member 6 is connected with box body 2 and can forms a partition region, avoids the part of sealing member 6 upside and the exhaust air direct contact of air inlet, through this kind of mode extension live time, also can protect the impurity pollution in the part is by the air inlet exhaust air simultaneously.

Referring to fig. 5, 9 and 10, optionally, the sealing element 6 includes a sealing portion 61, a buffering portion 62 and a first connecting portion 63, one end of the buffering portion 62 is connected to the sealing portion 61, the other end of the buffering portion 62 is connected to the first connecting portion 63, the buffering portion 62 is retractable, the first connecting portion 63, the buffering portion 62 and the sealing portion 61 form a cavity, the first connecting portion 63 is provided with an opening communicated with the cavity, the first connecting portion 63 is connected to the case 2, and the sealing portion 61 is connected to the lower tie beam 32 and located at an end of the lower tie beam 32 away from the upper tie beam 31. The sealing element 6 is composed of a sealing part 61, a buffering part 62 and a first connecting part 63 to form a protection area, the sealing part 61 is connected with the lower pull rod beam 32, and the sealing part 61 is directly used for blocking the air inlet of the box body 2 when in use, so that the sealing effect is better; the design of the buffer 62 in a telescopic manner enables a wider protection range of the seal 6.

Referring to fig. 3, 5 and 6, optionally, the pressing device 3 further includes a pressure plate 34, the pressure plate 34 is fixedly connected to the tie rod lower beam 32 and is located at an end of the tie rod lower beam 32 far away from the tie rod upper beam 31, and the sealing portion 61 is connected to the pressure plate 34. The pressure plate 34 can better plug the air inlet of the box body 2, the contact area is larger, and the sealing effect is ensured.

Referring to fig. 3, 8, 9 and 10, optionally, the limiting device 5 includes a pressing plate 51 and a supporting plate 52, the pressing plate 51 is sleeved on the pull rod upper beam 31, and the supporting plate 52 is sleeved on the pull rod lower beam 32. The limiting device 5 is provided with two parts, namely a pressing plate 51 and a supporting plate 52, so that the pressing device 3 can be conveniently installed and used.

Referring to fig. 3, 8, 9, and 10, optionally, the pressing plate 51 includes a first connecting plate 511, a first pressing element 512, and a first limiting portion 513, the first pressing element 512 is fixedly connected to the first limiting portion 513 through the first connecting plate 511, the first limiting portion 513 is disposed on an inner side of the first pressing element 512, the first limiting portion 513 is sleeved on the pull rod upper beam 31, the supporting plate 52 includes a second connecting plate 521, a second pressing element 522, and a second limiting portion 523, the second pressing element 522 is fixedly connected to the second limiting portion 523 through the second connecting plate 521, the second pressing element 522 is disposed corresponding to the first pressing element 512, the second limiting portion 523 is disposed on an inner side of the second pressing element 522, and the second limiting portion 523 is sleeved on the pull rod lower beam 32. The pressing plate 51 comprises a first connecting plate 511, a first pressing piece 512 and a first limiting part 513, the upper beam 31 of the pull rod can be limited through the matching, meanwhile, the supporting plate 52 comprises a second connecting plate 521, a second pressing piece 522 and a second limiting part 523, the lower beam 32 of the pull rod can be limited through the second limiting part 523, the second pressing piece 522 is matched with the first pressing piece 512, and the first pressing piece 512 positions the second pressing piece 522, so that the use is simple.

Referring to fig. 3, fig. 5, fig. 6 and fig. 7, optionally, box body 2 includes the cover body 21, bearing plate 22 and installation department 24, the cover body 21 sets up on the bearing plate 22, be provided with the air inlet on the bearing plate 22, installation department 24 is fixed to be set up the cover body 21 is inboard, stop device 5 sets up in the installation department 24. The box body 2 is designed into a cover body 21, a bearing plate 22 and an installation part 24, the cover body 21 and the bearing plate 22 can be disassembled, the use is more convenient, the installation part 24 can limit the limiting device 5, and the use process is more stable.

Referring to fig. 3, 5, 6 and 7, optionally, the box body 2 further includes a sealing ring 23, and the sealing ring 23 is disposed at a connection position of the cover body 21 and the bearing plate 22. The sealing ring 23 is arranged to seal between the cover body 21 and the bearing plate 22, so as to avoid air leakage and ensure the controllability of air pressure.

Referring to fig. 7, optionally, the mounting portion 24 includes a mounting groove 241 and a positioning portion 242, the mounting groove 241 is fixedly connected to the cover body 21, the positioning portion 242 is fixedly connected to the mounting groove 241 and located at one end away from the cover body 21, the limiting device 5 is disposed in the mounting groove 241, the sealing element 6 is connected to the positioning portion 242, and the limiting device 5 and the mounting portion 24 cooperate to position the sealing element 6. The mounting portion 24 includes a mounting groove 241 and a positioning portion 242 to limit the position of the limiting device 5, and the positioning portion 242 is convenient for mounting the sealing element 6, so that the use is more convenient.

Referring to fig. 5, 6, 11 and 12, optionally, a water outlet is further disposed on the box body 2, the water outlet and the water inlet of the box body 2 are located on the same side, the backflow cover 7 further includes a backflow cover 7, the backflow cover 7 includes an air inlet portion 71, a second connecting portion 72 and a blocking portion 73, the air inlet portion 71, the second connecting portion 72 and the blocking portion 73 are communicated to form an air inlet channel, one end of the second connecting portion 72 is fixedly connected to the air inlet portion 71, the other end of the second connecting portion 72 is fixedly connected to the blocking portion 73, the air inlet portion 71 is located on the inner side of the box body 2, the blocking portion 73 is located on the outer side of the box body 2, the box body 2 surrounding the air inlet is sleeved on the second connecting portion 72, and the blocking portion 73 and the water outlet are correspondingly used for blocking or opening the water outlet. The arrangement of the water outlet and the backflow cover 7 of the box body 2 can enable the use of the stepless pressure regulating valve to be more stable, when water is accumulated in the box body 2 and no air pressure exists, the water in the box body 2 exerts external force on the blocking part 73 and is discharged through the water outlet; when air pressure exists, external force is applied to the backflow cover 7 by the air pressure, the blocking portion 73 seals the water outlet on the box body 2, and air tightness is guaranteed through the mode.

Referring to fig. 3, 5, 6 and 7, optionally, the power device 1 further includes a bracket 14, the bracket 14 is fixedly disposed on the box body 2, and the rotation driving mechanism 11 is fixedly disposed on the bracket 14. The bracket 14 is provided to facilitate the installation of the rotation driving mechanism 11, so that the power device 1 can be used as a whole.

Referring to fig. 3, optionally, a connecting member 4 is further included, and the power device 1 and the pressing device 3 are connected through the connecting member 4.

Alternatively, the connecting member 4 is a pin.

Referring to fig. 13, in an embodiment of the present invention, a bubble breaker is disclosed, which includes any one of the above stepless pressure regulating valves, and the case 2 is provided with a first port and a second port, the first port is communicated with an inner cavity of the case, the first port is used for being connected with the water inlet valve assembly 8, and the second port is used for being connected with the pipe 9.

The bubble breaker uses the stepless pressure regulating valve as a component of the bubble breaker, can exert the control on air pressure, avoids the overlarge air pressure, and has high safety; meanwhile, the water inlet valve assembly 8 is arranged, so that the foam breaker can be conveniently cleaned, and the foam breaker is more convenient to use; the air pressure is adjusted through the cooperation of the cam 12 and the cam sleeve 13, the adjusting range is controllable, and the air pressure release is more stable.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. The stepless pressure regulating valve is characterized by comprising a power device (1), a box body (2), a pressing device (3) and a limiting device (5), wherein an air inlet is formed in the box body (2), the power device (1) comprises a rotary driving mechanism (11), a cam (12) and a cam sleeve (13), the rotary driving mechanism (11) is connected with the cam (12), the cam sleeve (13) is sleeved on the cam (12), the pressing device (3) comprises a pull rod upper beam (31), a pull rod lower beam (32) and a spring (33), the pull rod upper beam (31) is fixedly connected with the pull rod lower beam (32), the pull rod upper beam (31) is connected with the cam sleeve (13), the diameter of the pull rod upper beam (31) is smaller than that of the pull rod lower beam (32), the limiting device (5) is sleeved on the pull rod upper beam (31) and used for limiting the pull rod upper beam (31), the spring (33) is sleeved on the pull rod upper beam (31) and is located between the pull rod lower beam (32) and the limiting device (5), and the pull rod lower beam (32) is used for plugging or opening the air inlet.

2. The stepless pressure regulating valve according to claim 1, further comprising a sealing element (6), wherein the sealing element (6) is arranged in the box body (2), the sealing element (6) is sleeved on the lower tie rod beam (32) and is connected with the lower tie rod beam (32), and the connection position of the sealing element (6) and the lower tie rod beam (32) is located at one end of the lower tie rod beam (32) far away from the upper tie rod beam (31).

3. The stepless pressure regulating valve according to claim 2, characterized in that the sealing element (6) comprises a sealing part (61), a buffering part (62) and a first connecting part (63), one end of the buffering part (62) is connected with the sealing part (61), the other end of the buffering part is connected with the first connecting part (63), the buffering part (62) is telescopic, the first connecting part (63), the buffering part (62) and the sealing part (61) form a cavity, the first connecting part (63) is provided with an opening communicated with the cavity, the first connecting part (63) is connected with the box body (2), and the sealing part (61) is connected with the lower pull rod beam (32) and is located at one end of the lower pull rod beam (32) far away from the upper pull rod beam (31).

4. The stepless pressure regulating valve according to claim 3, characterized in that said pressing device (3) further comprises a pressure plate (34), said pressure plate (34) is fixedly connected with said lower tie rod beam (32) and is located at one end of said lower tie rod beam (32) far away from said upper tie rod beam (31), and said sealing portion (61) is connected with said pressure plate (34).

5. The stepless pressure regulating valve according to claim 1, wherein said limiting device (5) comprises a pressing plate (51) and a supporting plate (52), said pressing plate (51) is sleeved on said pull rod upper beam (31), and said supporting plate (52) is sleeved on said pull rod lower beam (32).

6. The stepless pressure regulating valve according to claim 5, wherein said pressure plate (51) comprises a first connecting plate (511), a first pressing member (512) and a first limiting portion (513), said first pressing member (512) and said first limiting portion (513) are fixedly connected through said first connecting plate (511), said first limiting portion (513) is disposed inside said first pressing member (512), said first limiting portion (513) is sleeved on said pull rod upper beam (31), said support plate (52) comprises a second connecting plate (521), a second pressing member (522) and a second limiting portion (523), said second pressing member (522) and said second limiting portion (523) are fixedly connected through said second connecting plate (521), said second pressing member (522) is disposed corresponding to said first pressing member (512), said second limiting portion (523) is disposed inside said second pressing member (522), the second limiting part (523) is sleeved on the lower beam (32) of the pull rod.

7. The stepless pressure regulating valve according to claim 1, wherein said box body (2) comprises a cover body (21), a pressure bearing plate (22) and a mounting portion (24), said cover body (21) is disposed on said pressure bearing plate (22), said pressure bearing plate (22) is provided with an air inlet, said mounting portion (24) is fixedly disposed inside said cover body (21), and said limiting device (5) is disposed inside said mounting portion (24).

8. The stepless pressure regulating valve according to claim 7, characterized in that said box body (2) further comprises a sealing ring (23), said sealing ring (23) is arranged at the connection of said cover body (21) and said pressure bearing plate (22).

9. The stepless pressure regulating valve according to claim 1, characterized in that said case (2) is further provided with a water outlet, the water outlet and the water inlet of the box body (2) are positioned on the same side, the water outlet also comprises a backflow cover (7), the backflow cover (7) comprises an air inlet part (71), a second connecting part (72) and a blocking part (73), the air inlet part (71), the second connecting part (72) and the blocking part (73) are communicated to form an air inlet channel, one end of the second connecting part (72) is fixedly connected with the air inlet part (71), the other end is fixedly connected with the blocking part (73), the air inlet part (71) is positioned at the inner side of the box body (2), the blocking part (73) is positioned at the outer side of the box body (2), the box body (2) which encloses the air inlet is sleeved on the second connecting part (72), the blocking part (73) is used for blocking or opening the water outlet corresponding to the water outlet.

10. A bubble breaker, comprising the stepless pressure regulating valve according to any one of claims 1 to 9, wherein the case (2) is provided with a first port and a second port which are communicated with the inner cavity of the case, the first port is used for being connected with the water inlet valve assembly (8), and the second port is used for being connected with the pipe (9).