Normally closed water pressure switch

Abstract

A normally-closed water pressure switch comprises a water pressure component, a butterfly-shaped bimetallic strip, an ejector rod, a driving rod, a terminal base, a top cover, a static terminal and a movable terminal, the driving rod is arranged in a rod cavity and is in sliding fit with the rod cavity, and the ejector rod is fixed to a fixing hole, is in sliding fit with an ejector rod hole and extends into a driving cavity; the static terminal is fixed in the static terminal groove, the output wiring board part is fixed in the outer side of the movable terminal groove, the elastic board part strides over the rod cavity, and the movable contact corresponds to the static contact; the top cover and the terminal base are buckled and fixed, and the reset rod is located in the guide hole. The double-butterfly-shaped metal sheet is arranged at the open end of the water pressure cavity and is sealed, the terminal base and a base body of the water pressure component are buckled and fixed, the driving cavity is opposite to the water pressure cavity and fixes the double-butterfly-shaped metal sheet, and the ejector rod is matched with the double-butterfly-shaped metal sheet. When the water pressure in the water pipeline exceeds the set pressure, the double-butterfly-shaped metal sheet rotates reversely, the drive rod is driven to move through the ejector rod, the drive rod drives the elastic plate part, the movable contact and the static contact to be separated, and overwater pressure power failure and safety protection are achieved.

Description

Technical Field

[0001] The utility model relates to a water pressure safety device arranged on a water heater pipeline. Background Art

[0002] The current existing technology, Chinese patent CN98247434.2, a water level and water pressure automatic switch, which includes a chassis and a shell cover, wherein the chassis is provided with a water inlet that can be screwed and connected to the water storage container, a micro switch is provided above the shell cover, a rubber elastic sheet is provided on the bottom of the chassis, and a push rod type touch button is installed at the center of the elastic rubber sheet. Under the action of water level pressure, the elastic rubber sheet is compressed and deformed, which will drive the push rod type touch button to move upward and touch the moving contact of the micro switch to connect or cut off the current. The working pressure of the switch of the utility model can be flexibly adjusted, with high sensitivity, stable and reliable switch action, wide application, and can be widely used in various electric water heater tanks, water storage tanks, or other various pressure vessels. The problem is that only one micro switch is set, and only one phase of electricity is controlled. Utility Model Content

[0003] The purpose of the utility model is to provide a normally closed water pressure switch, which has the characteristics of controlling multi-phase current and being adaptable to large current.

[0004] The utility model is implemented as follows: a normally closed water pressure switch, which is special in that it includes a water pressure component, a butterfly bimetallic strip, a push rod, a driving rod, a terminal seat, a top cover, a static terminal and a dynamic terminal.

[0005] The hydraulic component includes a seat body, a hydraulic chamber and an interface pipe.

[0006] The driving rod is provided with a reset rod and a fixing hole.

[0007] The terminal seat comprises a driving cavity, a rod cavity along the length direction, a top rod hole, at least two static terminal grooves and at least two dynamic terminal grooves, wherein the static terminal grooves and the dynamic terminal grooves are located on both sides of the rod cavity;

[0008] A guide hole is provided on the top cover, and the width of the top cover is smaller than the width of the terminal seat;

[0009] The static terminal includes an input wiring board portion, a contact board portion and a static contact, and the dynamic terminal includes an output wiring board portion, an elastic board portion and a dynamic contact.

[0010] The driving rod is arranged in the rod cavity and slides together, the push rod is fixed to the fixing hole and slides together with the push rod hole and extends into the driving cavity; the static terminal is fixed in the static terminal slot, the output wiring board part is fixed inside the outer side of the dynamic terminal slot, the elastic plate part spans the rod cavity, and the dynamic contact corresponds to the static contact; the top cover is buckled and fixed with the terminal seat, and the reset rod is located in the guide hole; the double butterfly metal sheet is arranged at the opening end of the water pressure cavity and is sealed, the terminal seat is buckled and fixed with the seat body of the water pressure component, the driving cavity is opposite to the water pressure cavity and fixes the double butterfly metal sheet, and the push rod cooperates with the double butterfly metal sheet.

[0011] The normally closed water pressure switch is special in that: a spring hole and an internal thread seat are respectively provided on both sides of the guide hole of the top cover, and the spring hole and the internal thread seat are connected;

[0012] Also includes spring and adjustment screw,

[0013] The adjusting screw includes a spring cavity, an axial pressure relief hole and a tool slot;

[0014] The lower end of the spring cooperates with the terminal seat support and crosses the rod cavity to cooperate with the driving rod, extends into the internal thread seat through the spring hole, the adjusting screw is screwed with the internal thread seat, and the spring extends into the spring cavity.

[0015] The normally closed water pressure switch is special in that: two screw rods are embedded in the static terminal slot, and two screw rods are embedded in the dynamic and static sub-slots;

[0016] Two connection holes are provided at the junction of the input wiring board portion and the contact board portion, and two connection holes are provided on the output wiring board portion;

[0017] The embedded screw rod passes through the connecting hole and is screwed into the nut.

[0018] The normally closed water pressure switch is special in that: a riveted rod is also provided on the output terminal board;

[0019] The elastic plate portion is provided with a fixed seat plate, and the fixed seat plate is provided with a rivet hole and a connecting hole; the rivet rod passes through the rivet hole and is riveted to the fixed seat plate; the screw rod passes through the connecting hole on the fixed seat plate and is screwed to the screw.

[0020] The normally closed water pressure switch is special in that: the interface pipe is perpendicular to the axis of the water pressure chamber;

[0021] Or the interface pipe coincides with the axis of the water pressure chamber.

[0022] The normally closed water pressure switch is special in that: the seat of the water pressure component is provided with an annular groove surrounding the opening end of the water pressure chamber;

[0023] It also includes a sealing ring, which is arranged in the annular groove, and the double butterfly metal sheet presses the sealing ring.

[0024] The normally closed water pressure switch is special in that: the movable terminal slot and the moving terminal slot are respectively provided with two, and the static terminal and the movable terminal are respectively provided with two.

[0025] The normally closed water pressure switch is special in that: the movable terminal slot and the moving terminal slot are respectively provided with three, and the static terminal and the movable terminal are respectively provided with three;

[0026] An air-avoiding hole is arranged on the elastic plate portion of the movable terminal located in the middle, and the reset rod passes through the air-avoiding hole.

[0027] The utility model discloses a normally closed water pressure switch. An interface pipe is connected with a water pipeline. When the water pressure in the water pipeline exceeds a set pressure, the double butterfly metal sheets are reversed and a driving rod is moved via a push rod. The driving rod drives an elastic plate portion, and a moving contact and a static contact are separated, thereby realizing power off due to excessive water pressure and safety protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a top view of the utility model.

[0029] Figure 2 yes Figure 1 A-A view of.

[0030] Figure 3 yes Figure 1 B-B view.

[0031] Figure 4 It is a stereogram of the utility model.

[0032] Figure 5 It is one of the three-dimensional exploded views of the utility model.

[0033] Figure 6 This is the second three-dimensional exploded view of the present utility model.

[0034] Figure 7 This is the third three-dimensional exploded view of the present utility model.

[0035] Figure 8 This is the fourth three-dimensional exploded view of the present invention.

[0036] Fig. 9 It is a stereogram of a second embodiment of the utility model. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, a normally closed water pressure switch includes a water pressure component 1, a butterfly bimetallic strip 2, a top rod 3, a driving rod 4, a terminal seat 5, a top cover 6, a static terminal 7 and a moving terminal 8.

[0040] The hydraulic component 1 comprises a seat body 1A, a hydraulic chamber 1B arranged at the center of the seat body, and an interface pipe 1C. The hydraulic chamber 1B is provided with an opening. The interface pipe 1C is connected to the hydraulic chamber 1B, and the interface pipe is connected to the seat body. The hydraulic component is made of plastic material in one piece.

[0041] The driving rod 4 is provided with a reset rod 41 and a fixing hole (not marked in the figure). The cross section of the driving rod 4 is square. The reset rod 41 and the fixing hole are on a straight strip and are respectively located on two parallel planes.

[0042] The terminal seat 5 includes a driving cavity 51, a rod cavity 52 along the length direction, a push rod hole 53, three static terminal grooves 54 and three dynamic terminal grooves 55. The static terminal grooves 54 and the dynamic terminal grooves 55 are located on both sides of the rod cavity 52 and are arranged along the width direction. The static terminal grooves 54 and the dynamic terminal grooves 55 are opposite to each other; the push rod hole 53 connects the driving cavity 51 and the rod cavity 52; the cross section of the rod cavity 52 is square, and the shape is adapted to the shape of the driving rod;

[0043] The top cover 6 is provided with a guide hole 61, and the width of the top cover 6 is smaller than the width of the terminal seat 5;

[0044] The static terminal 7 includes an input wiring board portion 71, a contact board portion 72 and a static contact (not shown in the figure), and the moving terminal 8 includes an output wiring board portion 81, an elastic board portion 82 and a moving contact (not shown in the figure).

[0045] The driving rod 4 is arranged in the rod cavity 52 and slides together, the push rod 3 is fixed to the fixing hole and slides together with the push rod hole 53; the butterfly bimetallic strip 2 is arranged on the opening of the water pressure chamber 1B and is sealed, the static terminal 7 is fixed in the static terminal groove 54, the output terminal board part 81 is fixed on the outer side of the moving terminal groove 55, and the elastic plate part 82 spans the rod cavity 52, the moving contact and the static contact correspond to each other, the push rod 3 extends into the driving cavity 51 and contacts and cooperates with the double butterfly-shaped metal strip 2; the top cover 6 is buckled and fixed with the terminal seat 5; the terminal seat 5 is buckled and fixed with the seat body 1A of the water pressure component 1, and the driving cavity 51 is opposite to the water pressure cavity 1B and fixes the double butterfly-shaped metal strip.

[0046] In a normal state, the reset rod 41 is located in the guide hole 61 , and in a power-off state, the reset rod 41 extends out of the guide hole 61 .

[0047] As a further improvement of the utility model: a spring hole 62 and an internal thread seat 63 are respectively provided on both sides of the guide hole 61 of the top cover 6, and the spring hole 62 and the internal thread seat 63 are connected;

[0048] It also includes a spring 9 and an adjusting screw 10,

[0049] The adjusting screw 10 includes a spring chamber 101, an axial pressure relief hole 102 and a tool groove 103;

[0050] The lower end of the spring 9 is supported and matched with the terminal seat 5 and crosses the rod cavity 52 to match the driving rod 4. The spring 9 extends into the internal thread seat 63 through the spring hole 62. The adjusting screw 10 is screwed with the internal thread seat 63, and the spring 9 extends into the spring cavity 101. This structure is used to adjust the maximum operating water pressure.

[0051] As a further improvement of the utility model: two screw rods 541 are embedded in the static terminal slot 54, and two screw rods are embedded in the dynamic and static sub-slots 55;

[0052] Two connection holes are provided at the junction of the input wiring board portion 71 and the contact board portion 72, and two connection holes are provided on the output wiring board portion 81;

[0053] The screw rod 541 in the static terminal slot 54 passes through the connection hole on the static terminal and is screwed with the nut, and the screw rod in the dynamic and static sub-slot 55 passes through the connection hole on the output terminal board part 81 and is screwed with the nut.

[0054] As a further improvement of the present utility model: the output terminal board portion 81 is further provided with a riveting rod 811;

[0055] The elastic plate portion 82 is provided with a fixed seat plate 821 , and the fixed seat plate 821 is provided with a rivet hole and a connection hole; the rivet rod 811 passes through the rivet hole and is riveted to the fixed seat plate 821 , and the screw rod passes through the connection hole on the fixed seat plate 821 and is screwed to the nut.

[0056] The interface pipe 1C is perpendicular to the axis of the water pressure chamber 1B;

[0057] Or the interface pipe 1C and the axis of the hydraulic chamber 1B coincide with each other, such as Fig. 9 shown.

[0058] As a further improvement of the present utility model: the seat body 1A of the water pressure component 1 is provided with an annular groove 1B1 surrounding the open end of the water pressure chamber 1B;

[0059] It also includes a sealing ring 11 , which is arranged in the annular groove 1B1 , and the double butterfly metal sheet 2 presses the sealing ring 11 .

[0060] The movable terminal slots 55 and the movable terminal slots 55 are respectively provided with two, and the static terminals 7 and the movable terminals 8 are respectively provided with two.

[0061] Alternatively, the movable terminal slots 55 and the movable terminal slots 55 are provided with three each, and the static terminals 7 and the movable terminals 8 are provided with three each;

[0062] The elastic plate portion 82 of the movable terminal 8 located in the middle is provided with a clearance hole 822 , and the reset rod 41 passes through the clearance hole 822 .

[0063] Figure 2 , Figure 3 This is the state of the utility model when the water pressure is within the set water pressure range, and the moving contact and the static contact are connected; when the water pressure entering the interface pipe exceeds the set pressure, the double butterfly metal sheet 2 reverses and enters the drive chamber 51, and drives the top rod to move upward, the drive rod 6 moves upward, the elastic plate part 82 moves, the moving contact and the static contact are separated, and the power is cut off; at the same time, the reset rod 41 extends out of the guide hole 61. When the water pressure returns to normal, the power-off state is still maintained; the reset rod 41 needs to be pressed manually.

[0064] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A normally closed water pressure switch, characterized in that: It includes hydraulic components, butterfly bimetallic strips, ejector rods, drive rods, terminal blocks, top covers, static terminals and dynamic terminals. The hydraulic component comprises a seat body, a hydraulic chamber and an interface pipe, and an opening is provided on the hydraulic chamber; The driving rod is provided with a reset rod and a fixing hole. The terminal seat comprises a driving cavity, a rod cavity along the length direction, a top rod hole, at least two static terminal grooves and at least two dynamic terminal grooves, wherein the static terminal grooves and the dynamic terminal grooves are located on both sides of the rod cavity; A guide hole is provided on the top cover, and the width of the top cover is smaller than the width of the terminal seat; The static terminal includes an input wiring board portion, a contact board portion and a static contact, and the dynamic terminal includes an output wiring board portion, an elastic board portion and a dynamic contact. The driving rod is arranged in the rod cavity and slides together, the push rod is fixed to the fixing hole and slides together with the push rod hole and extends into the driving cavity; the static terminal is fixed in the static terminal slot, the output wiring board part is fixed inside the outer side of the dynamic terminal slot, the elastic plate part spans the rod cavity, and the dynamic contact corresponds to the static contact; the top cover is buckled and fixed with the terminal seat, and the reset rod is located in the guide hole; the double butterfly metal sheet is arranged at the opening end of the water pressure cavity and is sealed, the terminal seat is buckled and fixed with the seat body of the water pressure component, the driving cavity is opposite to the water pressure cavity and fixes the double butterfly metal sheet, and the push rod cooperates with the double butterfly metal sheet.

2. A normally closed water pressure switch according to claim 1, characterized in that: A spring hole and an internal thread seat are respectively provided on both sides of the guide hole of the top cover, and the spring hole and the internal thread seat are connected; Also includes spring and adjustment screw, The adjusting screw includes a spring cavity, an axial pressure relief hole and a tool slot; The lower end of the spring cooperates with the terminal seat support and crosses the rod cavity driving rod, extends into the internal thread seat through the spring hole, the adjusting screw is screwed with the internal thread seat, and the spring extends into the spring cavity.

3. A normally closed water pressure switch according to claim 1, characterized in that: Two screw rods are pre-buried in the static terminal slot, and two screw rods are pre-buried in the dynamic and static sub-slots; Two connection holes are provided at the junction of the input wiring board portion and the contact board portion, and two connection holes are provided on the output wiring board portion; The screw rod passes through the connecting hole and is threadedly engaged with the nut.

4. A normally closed water pressure switch according to claim 3, characterized in that: The output terminal plate is also provided with a riveting rod; The elastic plate portion is provided with a fixed seat plate, and the fixed seat plate is provided with a rivet hole and a connecting hole; the rivet rod passes through the rivet hole and is riveted to the fixed seat plate; the screw rod passes through the connecting hole on the fixed seat plate and is screwed to the screw.

5. A normally closed water pressure switch according to claim 1, characterized in that: The interface pipe is perpendicular to the axis of the water pressure chamber; Or the interface pipe coincides with the axis of the water pressure chamber.

6. A normally closed water pressure switch according to claim 1, characterized in that: The seat of the hydraulic component is provided with an annular groove surrounding the open end of the hydraulic chamber; It also includes a sealing ring, which is arranged in the annular groove, and the double butterfly metal sheet presses the sealing ring.

7. A normally closed water pressure switch according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The movable terminal slots and the moving terminal slots are respectively provided with two, and the static terminals and the movable terminals are respectively provided with two.

8. A normally closed water pressure switch according to claim 1, 2, 3, 4, 5 or 6, characterized in that: The movable terminal slots and moving terminal slots are provided with three each, and the static terminals and movable terminals are provided with three each; An air-avoiding hole is arranged on the elastic plate portion of the movable terminal located in the middle, and the reset rod passes through the air-avoiding hole.

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