Pressure switch

Abstract

The utility model provides a pressure switch, which relates to the technical field of pressure switches and comprises a shell, a switch body, a joint, a diaphragm, an ejector rod, a movable contact and a static contact, pouring sealant and a ventilation channel are arranged between the shell and the switch body, the ventilation channel is connected with the inside of the switch body, and a waterproof ventilation film is arranged in the ventilation channel. Through the arrangement of the ventilation channel and the ePTFE film, the interior and the exterior of the switch body are kept in air path communication through the ePTFE film, so that the waterproof effect is achieved, the requirement of high IP grade is met, and the effects that the product action value is stable, and the requirement of the IP grade is met are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure switches, in particular to a pressure switch. Background Art

[0002] The main principle of the pressure switch is to use air pressure to act on a metal diaphragm. When the pressure exceeds a certain limit, the diaphragm flips and pushes the push rod upward. The push rod pushes the moving contact to separate the moving contact and the static contact, resulting in a switch breaking action.

[0003] At present, pressure switches are generally potted with epoxy resin to achieve a higher IP level. After potting with epoxy resin, a closed space is formed inside the switch body. When the product is potted at room temperature, the jump pressure of the diaphragm is P1. When the switch is in high and low temperature media or high and low temperature environments, or when the altitude changes greatly, there is a large gap between the jump pressure P2 of the switch and the original setting P1, resulting in inaccurate switch action. In view of the above defects, this application is proposed. Utility Model Content

[0004] The utility model aims to provide a pressure switch which can satisfy the requirements of stable product action value and IP grade.

[0005] To solve the above problems, the utility model provides a pressure switch, including a shell, a switch body, a joint, a diaphragm, a push rod, a moving contact and a static contact. A potting glue and a ventilation channel are arranged between the shell and the switch body. The ventilation channel is connected to the inside of the switch body. A waterproof and breathable membrane is arranged in the ventilation channel.

[0006] According to an embodiment of the present invention, the waterproof and breathable membrane is an ePTFE membrane.

[0007] According to an embodiment of the utility model, the waterproof breathable membrane is arranged at an end of the breathable channel away from the switch body.

[0008] According to an embodiment of the utility model, the waterproof and breathable membrane is arranged outside the shell.

[0009] According to an embodiment of the utility model, the waterproof and breathable membrane is arranged inside the shell.

[0010] According to an embodiment of the utility model, there is a gap between the waterproof breathable membrane and the inner wall of the shell.

[0011] According to an embodiment of the utility model, a breathable cap is arranged between the housing and the switch body, the breathable cap protrudes from the plane of the potting glue, and the waterproof breathable membrane is installed on the breathable cap.

[0012] According to an embodiment of the utility model, a protrusion is provided on the switch body, the air permeable cap is installed on the protrusion, and the air permeable cap and the protrusion form the air permeable channel.

[0013] According to an embodiment of the utility model, a membrane cover is connected to the joint, and the membrane is arranged between the membrane cover and the pressure plate.

[0014] According to an embodiment of the utility model, a push rod positioning plate is provided in the switch body, and the push rod is installed in a hole in the push rod positioning plate.

[0015] The beneficial effect of the utility model is that, through the provision of the air permeable channel and the ePTFE membrane, the air circuits inside and outside the switch body are kept connected through the ePTFE membrane to make it waterproof, meeting the requirements of the high IP level, and achieving the effect of both satisfying the stability of the product action value and meeting the requirements of the IP level. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the overall structure of the pressure switch;

[0018] Figure 2 This is a schematic diagram of the structure of the air permeable channel in the pressure switch. DETAILED DESCRIPTION

[0019] The following description is only used to disclose the utility model so that those skilled in the art can implement the utility model. The embodiments described below are only for example, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other solutions that do not deviate from the spirit and scope of the utility model.

[0020] [Example 1]

[0021] A pressure switch, such as Figure 1 , including a shell 111, a switch body 112, a connector 101, a diaphragm 118, a push rod 116, a moving contact 114 and a static contact 115. The connector 101 is connected to a diaphragm cover 102. The diaphragm 118 is arranged between the diaphragm cover 102 and the pressure plate 103 to ensure the installation tightness and sealing of the diaphragm 118. A push rod positioning plate 117 is arranged in the switch body 112. The push rod 116 is installed in the hole in the push rod positioning plate 117. A fastening ring 104 is arranged on the outside of the switch body 112. The connector 101 and the diaphragm cover 102 are welded and connected by a soldering sheet 119.

[0022] The moving contact 114 and the static contact 115 are both arranged inside the switch body 112. The moving contact 114 is connected to the connecting piece 105 through the moving contact piece 106 located on the upper side of the top rod 116. The static contact 115 is connected to the NC end connecting piece 113. The connecting piece 105 and the NC end connecting piece 113 are respectively connected to the plug piece 110.

[0023] A potting glue 107 and a breathable channel 120 are arranged between the shell 111 and the switch body 112. Optionally, the breathable channel 120 is not limited to being arranged in one group. The breathable channel 120 is connected to the inside of the switch body 112. A waterproof breathable membrane 109 is arranged in the breathable channel 120. The shell 111 is a non-sealed structure with a breathable gap or channel. Preferably, the waterproof breathable membrane 109 is an ePTFE membrane (polytetrafluoroethylene membrane). Through the arrangement of the breathable channel 120 and the ePTFE membrane, the inside and outside of the switch body are kept in air communication through the ePTFE membrane to be waterproof, which meets the requirements of high IP level and achieves the effect of satisfying both the stability of the product action value and the requirements of the IP level.

[0024] Preferably, the waterproof breathable membrane 109 is arranged at one end of the breathable channel 120 away from the switch body 112 to facilitate installation and maintenance and avoid the retention of water vapor.

[0025] Optionally, the waterproof breathable membrane 109 is arranged outside or inside the housing 111. In this embodiment, it is arranged inside to prevent the waterproof breathable membrane 109 from being damaged due to collision, etc. Further, there is a gap between the waterproof breathable membrane 109 and the inner wall of the housing 111 to ensure air permeability.

[0026] Preferably, a breathable cap 108 is provided between the housing 111 and the switch body 112, a breathable channel 120 is formed in the breathable cap 108, the breathable cap 108 protrudes from the plane of the potting glue 107, and a waterproof breathable membrane 109 is installed on the breathable cap 108 to prevent the potting glue 107 from entering the breathable channel 120 during potting.

[0027] Furthermore, a protrusion 121 is provided on the switch body 112, and the breathable cap 108 is installed on the protrusion 121. The breathable cap 108 and the protrusion 121 form a breathable channel 120, and the two can be snap-connected or threaded. When the protrusion 121 is a tubular protrusion, it is preferably threaded. The setting of the breathable cap 108 can facilitate the adjustment of the installation height of the waterproof breathable membrane 109, and can adapt to different thicknesses of potting glue 107 or different shapes of shells by adjusting the installation height of the breathable cap 108. The cooperation between the breathable cap 108 and the protrusion 121 ensures the independence of the breathable channel 120 compared to the potting glue 107 area, thereby preventing the potting glue 107 from entering the breathable channel 120.

[0028] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed and modified in any way.

Claims

1. A pressure switch, characterized in that: The invention comprises a housing (111), a switch body (112), a joint (101), a diaphragm (118), a push rod (116), a moving contact (114) and a stationary contact (115); a potting glue (107) and a venting channel (120) are arranged between the housing (111) and the switch body (112); the venting channel (120) is connected to the inside of the switch body (112); and a waterproof and breathable membrane (109) is arranged in the venting channel (120).

2. The pressure switch according to claim 1, characterized in that: The waterproof and breathable membrane (109) is an ePTFE membrane.

3. The pressure switch according to claim 2, characterized in that: The waterproof and breathable membrane (109) is arranged at one end of the breathable channel (120) away from the switch body (112).

4. The pressure switch according to any one of claims 1 to 3, characterized in that: The waterproof and breathable membrane (109) is arranged outside the housing (111).

5. The pressure switch according to any one of claims 1 to 3, characterized in that: The waterproof and breathable membrane (109) is arranged inside the housing (111).

6. The pressure switch according to claim 5, characterized in that: There is a gap between the waterproof and breathable membrane (109) and the inner wall of the outer shell (111).

7. The pressure switch according to claim 6, characterized in that: A breathable cap (108) is provided between the housing (111) and the switch body (112), the breathable cap (108) protrudes from the plane of the potting glue (107), and the waterproof breathable membrane (109) is mounted on the breathable cap (108).

8. The pressure switch according to claim 7, characterized in that: The switch body (112) is provided with a raised portion (121), the air permeable cap (108) is mounted on the raised portion (121), and the air permeable cap (108) and the raised portion (121) form the air permeable channel (120).

9. The pressure switch according to any one of claims 6 to 8, characterized in that: The joint (101) is connected to a membrane cover (102), and the membrane (118) is arranged between the membrane cover (102) and the pressure plate (103).

10. The pressure switch according to claim 9, characterized in that: A push rod positioning plate (117) is provided in the switch body (112), and the push rod (116) is installed in a hole in the push rod positioning plate (117).

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