CN220020984U - Pressure switch and water purification equipment - Google Patents

Abstract

The utility model relates to the technical field of water purifying equipment, in particular to a pressure switch and water purifying equipment. The pressure switch comprises a shell, a diaphragm assembly and a switch assembly, wherein the diaphragm is arranged in the cavity, partitions the cavity into a first cavity and a second cavity, and can move in response to the pressure difference between the two cavities; the push rod can move along the axial direction of the cavity along with the movement of the diaphragm; the switch assembly comprises a fixed contact and a movable contact, wherein the movable contact is connected with the push rod and can be contacted with or separated from the fixed contact under the drive of the push rod. The shell is further provided with a communication hole, the first cavity is communicated with the outside through the communication hole so as to control the pressure in the first cavity to be kept stable, prevent the pressure from continuously rising due to the existence of pressure holding in the first cavity, and ensure that the diaphragm assembly pushes the movable contact to be separated from the fixed contact according to the set pressure.

Description

Pressure switch and water purification equipment

Technical Field

The utility model relates to the technical field of water purifying equipment, in particular to a pressure switch and water purifying equipment.

Background

A pressure switch is an electrical switch that controls the switching state of an electrical circuit in response to changes in pressure. It is usually composed of a metal spring and an adjustable pressure sensitive element, and when the pressure reaches or exceeds a preset value, the circuit is switched on and off.

The pressure switch in the prior art can cause the change of the air pressure in the cavity due to the continuous action of the metal elastic sheet, and the pressure applied to the reed can be influenced by the changed pressure, so that the working pressure of the pressure switch deviates from the actual pressure. Thus, when the pressure in the pipeline exceeds the pressure threshold value, the pressure switch cannot timely control the pipeline to release the pressure, so that the internal elements of the pipeline are damaged.

Disclosure of Invention

Based on this, it is necessary to provide a pressure switch and a water purifying apparatus capable of balancing the pressure between the chamber and the outside.

A pressure switch, the pressure switch comprising:

a housing forming a cavity;

a diaphragm assembly including a diaphragm and a pushrod, the diaphragm being mounted within the cavity and isolating the cavity from first and second chambers that are not in communication with each other and being movable in response to a pressure differential between the first and second chambers; the push rod is positioned in the first cavity, connected with the diaphragm and capable of moving along the axial direction of the cavity along with the movement of the diaphragm;

the switch assembly is arranged in the first cavity and comprises a fixed contact and a movable contact, and the movable contact is connected with the push rod and can contact with or be far away from the fixed contact under the drive of the push rod so as to enable the movable contact to be electrically connected with the fixed contact or release the electrical connection between the movable contact and the fixed contact;

the shell is further provided with a communication hole, and the first chamber is communicated with the outside through the communication hole so as to control the pressure in the first chamber to be kept stable.

It can be understood that the communication hole for enabling the first chamber to be communicated with the outside is formed in the shell, when the diaphragm moves in response to the pressure difference between the first chamber and the second chamber, the first chamber is not affected by the volume change of the first chamber due to the communication with the outside, so that the pressure in the first chamber is kept stable all the time, namely the pressure in the first chamber is prevented from being continuously increased due to the pressure holding, and the diaphragm assembly is ensured to push the movable contact to be separated from the fixed contact according to the set pressure.

In an embodiment, the switch assembly further comprises a conductive spring, the housing is connected with a first inserting piece and a second inserting piece, and one ends of the first inserting piece and the second inserting piece are located in the first cavity;

the conductive elastic sheet is positioned in the first cavity and connected with the first inserting sheet, the movable contact is installed at one end of the conductive elastic sheet, which is far away from the first inserting sheet, and the push rod can push the conductive elastic sheet so as to control the contact or the distance between the movable contact and the stationary contact.

It can be appreciated that the conductive spring piece has elasticity, can control the separation between the movable contact and the stationary contact under the pushing of the push rod, and also can make the movable contact and the stationary contact under the action of restoring force after the pushing force of the push rod is removed.

In an embodiment, the conductive spring plate is provided with an abutting portion protruding towards the push rod, and the abutting portion is used for being matched with the push rod.

In one embodiment, a crosspiece is formed between the first chamber and the diaphragm, and a guide hole is formed in the crosspiece along the axial direction of the cavity;

the end of the push rod far away from the membrane is penetrated through the guide hole and moves under the guide of the guide hole.

It can be understood that the guide hole plays a limiting role on the push rod, and ensures that the push rod is accurately contacted with or separated from the abutting part.

In an embodiment, the diaphragm is provided with a metal elastic sheet, the metal elastic sheet is located between the crosspiece and the diaphragm, and the push rod is connected to the metal elastic sheet.

It can be understood that the metal elastic sheet has a deformation threshold, when the force exerted on the metal elastic sheet by the diaphragm exceeds the deformation threshold, the metal elastic sheet can generate instant deformation to push the push rod to control the separation of the fixed contact and the movable contact, and when the force exerted on the metal elastic sheet by the diaphragm does not exceed the deformation threshold, the original shape of the metal elastic sheet is kept unchanged, so that the contact between the fixed contact and the movable contact is kept, and the pressure switch is realized.

In an embodiment, along an axis direction of the cavity, a surface of the crosspiece facing the diaphragm is provided with a first recess portion recessed toward the first cavity, and the first recess portion is used for being matched with the metal elastic sheet.

It can be appreciated that the first concave portion is provided to enable the metal spring to be deformed effectively, so that the force value interval of the metal spring is increased, and a sufficient thrust is obtained to ensure the separation of the stationary contact and the movable contact.

In an embodiment, the housing includes a main body and a first cover, one end of the main body has an accommodating cavity disposed in an opening, and the first cover is hermetically covered on the opening, so that the accommodating cavity forms the first chamber.

In one embodiment, the space between the main body and the first cover is sealed by epoxy resin.

It is understood that epoxy resins have good waterproof, heat-resistant and electrically insulating properties, and can form an effective sealing layer to protect safe operation of high-sensitivity devices such as electronic devices.

In one embodiment, the push rod is provided as an insulator.

It can be understood that the push rod is arranged as an insulating piece, so that current flowing through the conductive elastic sheet can not contact the diaphragm, and damage to the diaphragm is avoided.

The utility model also provides a technical scheme as follows:

a water purification apparatus comprising a pressure switch as described above.

Compared with the prior art, the pressure switch provided by the utility model has the advantages that the communication hole which enables the first chamber to be communicated with the outside is formed in the shell, so that when the diaphragm moves in response to the pressure difference between the first chamber and the second chamber, the first chamber is not influenced by the volume change of the first chamber due to the communication with the outside, the stability of the pressure in the first chamber is kept all the time, namely the pressure in the first chamber is prevented from being continuously increased due to the pressure holding, and the diaphragm assembly is ensured to push the movable contact to be separated from the fixed contact according to the set pressure.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following descriptions are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a schematic diagram of a pressure switch according to the present utility model.

Fig. 2 is a cross-sectional view of a pressure switch provided by the present utility model.

Reference numerals: 100. a pressure switch; 10. a housing; 11. a cavity; 111. a first chamber; 112. a second chamber; 12. a communication hole; 13. a first insert sheet; 14. a second insert sheet; 15. a crosspiece; 151. a guide hole; 152. a first concave portion; 153. a convex portion; 16. a main body; 161. a receiving chamber; 162. a mounting part; 17. a first cover; 18. a second cover; 181. a diversion channel; 182. an involute portion; 20. a diaphragm assembly; 21. a membrane; 22. a push rod; 23. a metal spring plate; 30. a switch assembly; 31. a stationary contact; 32. a movable contact; 33. a conductive spring plate; 331. an abutting portion.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 2, the present utility model provides a pressure switch 100, and the pressure switch 100 can be used as a general-purpose device. In this embodiment, the pressure switch 100 is applied to a water purifying device or other waterways requiring control of pipeline pressure, and the product can be used for pressure detection in the range of 0-8 Bar, and can adjust the working pressure of the pressure switch 100 according to the pressure requirements of different customers.

As shown in fig. 1 and 2, the pressure switch 100 includes a housing 10, a diaphragm assembly 20, and a switch assembly 30. The housing 10 is formed with a cavity 11. The diaphragm assembly 20 includes a diaphragm 21 and a pushrod 22, the diaphragm 21 being installed in the chamber 11 and blocking the chamber 11 from the first and second chambers 111 and 112 that are not communicated with each other, and being movable in response to a pressure difference between the first and second chambers 111 and 112; the push rod 22 is located in the first chamber 111 and connected to the diaphragm 21, and is movable along the axial direction of the chamber 11 in accordance with the movement of the diaphragm 21. The switch assembly 30 is disposed in the first chamber 111 and includes a stationary contact 31 and a movable contact 32, wherein the movable contact 32 is connected with the push rod 22 and can contact with or be away from the stationary contact 31 under the driving of the push rod 22, so that the movable contact 32 is electrically connected with the stationary contact 31 or the electrical connection between the movable contact 32 and the stationary contact 31 is released. The casing 10 is further provided with a communication hole 12, and the first chamber 111 is communicated with the outside through the communication hole 12, so as to control the pressure in the first chamber 111 to be stable. When the diaphragm 21 moves in response to the pressure difference between the first chamber 111 and the second chamber 112, the first chamber 111 is not affected by the volume change thereof due to the communication with the outside, so that the pressure in the first chamber 111 is kept stable all the time, that is, the pressure in the first chamber 111 is prevented from being continuously increased due to the holding pressure, and the diaphragm assembly 20 is ensured to push the movable contact 32 to be separated from the stationary contact 31 according to the set pressure.

In this embodiment, the housing 10 includes a main body 16 and a first cover 17, one end of the main body 16 has an accommodating cavity 161 disposed in an opening, and the first cover 17 is hermetically covered on the opening, so that the accommodating cavity 161 forms a sealed first chamber 111, thereby preventing water, dust, etc. from entering the first chamber 111 and damaging electronic components such as the movable contact 32 and the stationary contact 31.

Preferably, the space between the main body 16 and the first cover 17 is sealed by epoxy resin. It should be noted that the epoxy resin has good waterproof performance, heat resistance and electrical insulation performance, and an effective seal can be formed to the pressure switch 100 by forming an epoxy resin layer on the body 16 by potting, preventing a short circuit or a bad contact effect due to contact of the switch assembly 30 with water. Of course, a separate sealing member may be provided between the first cover 17 and the opening to seal the opening with the first cover 17.

As shown in fig. 2, the housing 10 further includes a second cover 18, and the second cover 18 is fixedly connected with the main body 16 and formed with a mounting portion 162, so that the diaphragm 21 is fixed between the second cover 18 and the main body 16 by the mounting portion 162. And, after the second cover 18 is connected with the housing 10, the second chamber 112 may be formed in cooperation with the diaphragm 21.

Specifically, the second cover 18 and the main body 16 may be connected by welding, screwing, or the like. Here, the second cover 18 and the main body 16 are screwed together, so that the second cover 18 and the main body 16 are better sealed, and the second cover 18 and the main body 16 are convenient to disassemble and assemble, so that the membrane 21 and other vulnerable parts can be conveniently maintained and replaced. Meanwhile, the mounting portion 162 is specifically a limiting groove formed before the second cover 18 and the main body 16, and the circumferential edge of the diaphragm 21 is limited in the limiting groove, so that the mounting and fixing of the diaphragm 21 are realized.

Further, a diversion channel 181 is formed on the second cover 18, and the diversion channel 181 is used for communicating with a waterway system such as a water purifying device, so as to guide liquid or gas into the second chamber 112 to squeeze the membrane 21. In addition, the second cover 18 is further formed with an involute 182 at the connection between the diversion channel 181 and the second chamber 112, the involute 182 can uniformly fill the second chamber 112 with the liquid or gas introduced from the diversion channel 181, so as to avoid the liquid or gas introduced from the diversion channel 181 directly impacting the diaphragm 21 to affect the normal operation of the pressure switch 100, and the surface of the involute 182 is one of a straight line or an arc line.

In one embodiment, a crosspiece 15 is formed between the first chamber 111 and the diaphragm 21, and a guide hole 151 is formed in the crosspiece 15 along the axial direction of the chamber 11. The end of the push rod 22 remote from the diaphragm 21 is penetrated through the guide hole 151 and moves under the guide of the guide hole 151, so that the push rod 22 can stably push the movable contact 32 to move.

Further, the protruding portion 153 is further formed on the crosspiece 15, the protruding portion 153 protrudes towards the direction of the first chamber 111 along the circumferential direction of the guide hole 151, the protruding portion 153 can lengthen the length of the guide hole 151, guide and limit actions of the guide hole 151 on the push rod 22 are enhanced, and the push rod 22 is guaranteed to accurately push the movable contact 32 to be separated from the fixed contact 31.

As shown in fig. 2, the membrane 21 is provided with a metal spring piece 23, the metal spring piece 23 is located between the crosspiece 15 and the membrane 21, and the push rod 22 is connected to the metal spring piece 23. The working principle of the metal spring piece 23 is as follows: the metal spring plate 23 has a deformation threshold, and when the metal spring plate 23 is not stressed, the metal spring plate 23 protrudes toward the second chamber 112. When the force exerted by the diaphragm 21 on the metal dome 23 does not exceed the deformation threshold, the metal dome 23 does not change. When the force exerted by the diaphragm 21 on the metal spring plate 23 exceeds the deformation threshold, the metal spring plate 23 is instantaneously protruded to the first chamber 111 so as to push the push rod 22 to move, and then when the force exerted by the diaphragm 21 on the metal spring plate 23 falls below the deformation threshold, the metal spring plate 23 is instantaneously protruded to the first chamber 111 again, and the conductive spring plate 33 rebounds so that the movable contact 32 is in contact with the stationary contact 31.

In this embodiment, along the axis direction of the cavity 11, a surface of the crosspiece 15 facing the membrane 21 has a first recess 152 recessed toward the first chamber 111, and the first recess 152 is configured to cooperate with the metal spring 23 protruding toward the first chamber 111. It should be explained that, the first concave portion 152 can be matched with the metal elastic sheet 23 after exceeding the deformation threshold, so that the metal elastic sheet 23 can be effectively deformed, and thus the force value interval of the metal elastic sheet 23 is increased, and enough thrust is obtained to ensure the separation of the stationary contact 31 and the movable contact 32.

In an embodiment, the push rod 22 is provided as an insulating member, and it should be explained that if the push rod is provided as an insulating member, the current flowing through the conductive spring plate will not contact the diaphragm 21, so as to avoid damage to the diaphragm 21, and preferably, the push rod 22 is provided as a ceramic rod or a plastic rod. Here, the push rod 22 is provided with ceramic material which is not only non-conductive, but also has the advantage of being lightweight and wear-resistant.

As shown in fig. 2, the switch assembly 30 further includes a conductive spring 33, and the housing 10 is connected with the first insert 13 and the second insert 14, where one ends of the first insert 13 and the second insert 14 are located in the first cavity 111. The conductive elastic piece 33 is located in the first chamber 111 and connected with the first inserting piece 13, the movable contact 32 is installed at one end of the conductive elastic piece 33 far away from the first inserting piece 13, and the push rod 22 can push the conductive elastic piece 33 to control the contact or the separation between the movable contact 32 and the stationary contact 31.

Further, the conductive elastic sheet 33 is provided with an abutting portion 331 protruding towards the direction of the push rod 22, and the abutting portion 331 is used for being matched with the push rod 22 so that the push rod 22 pushes the conductive elastic sheet 33.

Specifically, the abutting portion 331 is disposed towards the protrusion of the push rod 22, and the abutting portion 331 is provided with a rounded corner along the circumferential direction thereof, so as to avoid damage to the push rod 22.

The utility model also provides a technical scheme as follows:

a water purification apparatus comprising the pressure switch 100 described above.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be determined from the following claims.

Claims (10)

1. A pressure switch, the pressure switch comprising:

a housing (10), the housing (10) being formed with a cavity (11);

-a diaphragm assembly (20), the diaphragm assembly (20) comprising a diaphragm (21) and a pushrod (22), the diaphragm (21) being mounted within the cavity (11) and isolating the cavity (11) from each other a first chamber (111) and a second chamber (112) and being movable in response to a pressure difference between the first chamber (111) and the second chamber (112); the push rod (22) is positioned in the first chamber (111) and connected with the membrane (21) and can move along the axial direction of the cavity (11) along with the movement of the membrane (21);

the switch assembly (30) is arranged in the first chamber (111) and comprises a fixed contact (31) and a movable contact (32), the movable contact (32) is connected with the push rod (22) and can contact with or be far away from the fixed contact (31) under the driving of the push rod (22), so that the movable contact (32) is electrically connected with the fixed contact (31) or the movable contact (32) is electrically disconnected with the fixed contact (31);

the shell (10) is further provided with a communication hole (12), and the first chamber (111) is communicated with the outside through the communication hole (12) so as to control the pressure in the first chamber (111) to be kept stable.

2. The pressure switch according to claim 1, wherein the switch assembly (30) further comprises a conductive spring plate (33), the housing (10) is connected with a first insert plate (13) and a second insert plate (14), and one end of each of the first insert plate (13) and the second insert plate (14) is located to extend into the first chamber (111);

the conductive elastic piece (33) is located in the first cavity (111) and is connected with the first inserting piece (13), the movable contact (32) is installed at one end, far away from the first inserting piece (13), of the conductive elastic piece (33), and the push rod (22) can push the conductive elastic piece (33) so as to control contact or distance between the movable contact (32) and the fixed contact (31).

3. Pressure switch according to claim 2, characterized in that the conductive spring (33) is provided with an abutment (331) protruding towards the push rod (22), said abutment (331) being adapted to cooperate with the push rod (22).

4. Pressure switch according to claim 1, characterized in that a crosspiece (15) is formed between the first chamber (111) and the membrane (21), said crosspiece (15) being provided with a guide hole (151) along the axial direction of the cavity (11);

the end of the push rod (22) far away from the membrane (21) is penetrated through the guide hole (151) and moves under the guide of the guide hole (151).

5. The pressure switch according to claim 4, wherein a metal spring (23) is provided on the diaphragm (21), the metal spring (23) is located between the crosspiece (15) and the diaphragm (21), and the push rod (22) is connected to the metal spring (23).

6. A pressure switch according to claim 5, characterized in that, along the axial direction of the cavity (11), a surface of the crosspiece (15) facing the membrane (21) is provided with a first recess (152) recessed in the direction of the first chamber (111), the first recess (152) being intended to cooperate with the metal spring plate (23).

7. The pressure switch according to claim 1, wherein the housing (10) comprises a main body (16) and a first cover (17), one end of the main body (16) is provided with a containing cavity (161) arranged in an opening, and the first cover (17) is hermetically covered on the opening, so that the containing cavity (161) forms the first chamber (111).

8. Pressure switch according to claim 7, characterized in that the space between the body (16) and the first cover (17) is sealed by means of epoxy.

9. Pressure switch according to claim 1, characterized in that the push rod (22) is provided as an insulator.

10. A water purification apparatus comprising a pressure switch as claimed in any one of claims 1 to 9.