A heating type water pressure differential switch

Abstract

The present invention discloses a heating type water pressure differential switch, comprising a housing, wherein the housing comprises an upper housing and a lower housing arranged up and down, a heating chamber is further provided on one side of the housing, the heating chamber is close to the inner chamber of the housing, a heating body is provided in the heating chamber, and the heating body is connected to an external power supply through a wire. The heating type water pressure differential switch of the present invention uses the heating body to heat the body, thereby ensuring that the water inside the body will not freeze, so that the movement of the magnet is not affected, and the function is continuously effective. Compared with the existing water pressure differential switch, the electric heating function is added, which meets the use requirements in a low temperature environment of 0 to -30°C and improves the product performance.

Description

Technical Field

[0001] The invention relates to the technical field of flow switches, and in particular to a heating type water pressure difference switch for monitoring the water flow pressure difference value of the inlet and outlet water ports of a plate heat exchanger or a shell and tube heat exchanger in a central air conditioner. Background Art

[0002] At present, the existing water pressure differential switch sends out the switch signal through the change of the water pressure differential at the inlet and outlet ports of the plate heat exchanger or shell and tube heat exchanger in the central air conditioner. However, when the ambient temperature is ≤0℃, the water inside the water pressure differential switch body will freeze. After the water freezes the diaphragm, magnet and spring inside the body, the water pressure differential switch cannot send out the switch signal and the switch function fails. Summary of the invention

[0003] In order to overcome the above defects, the present invention provides a heating type water pressure difference switch, which can effectively solve the above problems.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a heating type water pressure differential switch, including a shell, the shell includes an upper shell and a lower shell arranged up and down, the shell is provided with an upper water inlet and a lower water inlet, a first magnet that can move downward under the water pressure difference between the upper and lower water inlets is provided in the shell, the upper end of the first magnet abuts against a pressure spring, a second magnet that repels the first magnet and can move up and down is provided at the upper end of the shell, a micro switch for controlling the opening and closing of the device with water is also fixed on the shell, the contact of the micro switch is located above the second magnet, and the The first magnet moves upward to push the second magnet to touch the microswitch to control the opening and closing of the microswitch. A horizontal diaphragm that can move up and down is provided in the shell. The middle of the diaphragm is circular and the outside is a curved telescopic surface. The edge of the telescopic surface is fixed on the inner side of the shell. The diaphragm divides the inner cavity of the shell into two upper and lower cavities. A moving plate is provided above the diaphragm. The first magnet is located in the moving plate. A heating cavity is also provided on one side of the shell. The heating cavity is close to the inner cavity of the shell. A heating body is provided in the heating cavity, and the heating body is connected to an external power supply through a wire.

[0005] As a further improvement of the present invention, the lower cavity of the shell inner cavity is provided with a convex isolation column, the height of the convex isolation column is less than the height of the lower cavity, and its height is 5 mm, forming a garbage sedimentation area in the cavity. After the garbage is settled, it no longer contacts the bottom of the diaphragm and does not affect the movement of the diaphragm.

[0006] As a further improvement of the present invention, a shell cover is provided on the top of the shell, and the connection between the shell and the shell cover is designed with a raised edge, and the shell cover part is designed with a matching recessed edge, so as to improve the waterproof performance of the shell and prevent condensed water and condensation from entering the interior of the junction box.

[0007] As a further improvement of the present invention, the shell is made of aluminum alloy.

[0008] As a further improvement of the present invention, the wire connecting the heating body and the micro switch extends from a wire outlet below the shell to connect to an external power source.

[0009] As a further improvement of the present invention, the heating body is a PTC heating sheet.

[0010] The beneficial effects of the present invention are as follows: the heating type water pressure differential switch of the present invention uses a heating body to heat the body, thereby ensuring that the water inside the body will not freeze, so that the movement of the magnet is not affected and the function is continuously effective. Compared with the existing water pressure differential switch, the electric heating function is added, which meets the use requirements in a low temperature environment of 0 to -30°C and improves product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Markings in the figure: 1-shell; 2-wire outlet; 3-upper water inlet; 4-lower water inlet; 5-first magnet; 6-pressure spring; 7-second magnet; 8-micro switch; 9-contact; 10-diaphragm; 11-moving plate; 12-heating chamber; 13-heating body; 14-conducting wire; 15-convex isolation column; 16-shell cover. DETAILED DESCRIPTION

[0013] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0014] Figure 1An embodiment of a heating type water pressure differential switch of the present invention is shown, comprising a housing 1, wherein the housing comprises an upper housing and a lower housing arranged up and down, an upper water inlet 3 and a lower water inlet 4 are provided on the housing 1, a first magnet 5 which can move upward under the water pressure difference between the upper and lower water inlets is provided in the housing 1, a pressure spring 6 is abutted against the upper end of the first magnet 5, a second magnet 7 which repels the first magnet 5 and can move up and down is provided at the upper end of the housing 1, a micro switch 8 for controlling the opening and closing of the device with water is also fixed on the housing 1, a contact 9 of the micro switch 8 is located above the second magnet 7, and the first magnet 5 moves upward to push the second magnet 7. The magnet 7 touches the micro switch to control the opening and closing of the micro switch. A horizontal diaphragm 10 that can move up and down is provided in the shell 1. The middle of the diaphragm 10 is in the shape of a disc, and the outside is a curved telescopic surface. The edge of the telescopic surface is fixed on the inner side of the shell. The diaphragm 10 divides the inner cavity of the shell 1 into two upper and lower cavities. A moving plate 11 is provided above the diaphragm 10, and the first magnet 5 is located in the moving plate 11. A heating cavity 12 is also provided on one side of the shell 1. The heating cavity 12 is close to the inner cavity of the shell 1. A heating body 13 is provided in the heating cavity 12, and the heating body 13 is connected to an external power supply through a wire 14.

[0015] The lower cavity of the inner cavity of the shell 1 is provided with a convex isolation column 15, the height of which is less than the height of the lower cavity, and its height is 5mm, forming a garbage precipitation area in the cavity. After the garbage is precipitated, it no longer contacts the bottom of the diaphragm and does not affect the movement of the diaphragm.

[0016] A shell cover 16 is disposed on the top of the shell 1, and the connection between the shell 1 and the shell cover 16 is designed with a raised edge, and the shell cover 16 is designed with a matching recessed edge, so as to improve the waterproof performance of the shell, and condensation water and condensation cannot enter the inside of the junction box.

[0017] The housing 1 is made of aluminum alloy.

[0018] The wire 14 connecting the heating body 13 and the micro switch 8 extends from the outlet at the bottom of the housing 1 to connect to an external power source.

[0019] The heating body is a PTC heating sheet.

[0020] Water flows into the body on both sides of the diaphragm 10 through the water inlet. When the diaphragm 10 senses the pressure difference of the water flow on both sides, it drives the first magnet 5 to move. Because the first magnet 5 and the second magnet 7 are placed with the same poles facing each other and on the same axis, the magnetic force transmission causes the second magnet 7 to move synchronously and contact the contact 9 of the micro switch 8, so that the micro switch 8 is in the on or off state and sends a switch signal. The micro switch 8 transmits the switch signal to the control device connected to it through the connecting wire 14.

Claims

1. A heating type water pressure differential switch, characterized in that: The invention comprises a shell (1), wherein the shell comprises an upper shell and a lower shell arranged in an upper and lower manner, wherein the shell (1) is provided with an upper water inlet (3) and a lower water inlet (4), wherein a first magnet (5) capable of moving upward under the water pressure difference between the upper water inlet (3) and the lower water inlet (4) is provided in the shell (1), wherein the upper end of the first magnet (5) is abutted against a pressure spring (6), wherein the upper end of the shell (1) is provided with a second magnet (7) which repels the first magnet (5) and can move upward, and wherein a micro switch (8) for controlling the opening and closing of a device with water is also fixed on the shell (1), wherein a contact (9) of the micro switch (8) is located above the second magnet (7), and wherein the first magnet (5) moves upward to push the second magnet (7) to contact the first magnet (7) The micro switch controls the opening and closing of the micro switch. A horizontal diaphragm (10) capable of moving up and down is provided in the shell (1). The middle of the diaphragm (10) is in the shape of a circular plate, and the outside is a curved telescopic surface. The edge of the telescopic surface is fixed on the inner side surface of the shell. The diaphragm (10) divides the inner cavity of the shell (1) into two upper and lower cavities. A moving plate (11) is provided above the diaphragm (10). The first magnet (5) is located in the moving plate (11). A heating cavity (12) is also provided on one side of the shell (1). The heating cavity (12) is close to the inner cavity of the shell (1). A heating body (13) is provided in the heating cavity (12). The heating body (13) is connected to an external power supply through a wire (14).

2. A heating type water pressure differential switch according to claim 1, characterized in that: The lower cavity of the inner cavity of the shell (1) is provided with a convex isolation column (15), the height of the convex isolation column (15) is less than the height of the lower cavity, and the height is 5 mm.

3. A heating type water pressure differential switch according to claim 1, characterized in that: A shell cover (16) is provided on the top of the shell (1); the connection between the shell (1) and the shell cover (16) is designed with a raised edge, and the shell cover (16) is designed with a matching recessed edge.

4. A heating type water pressure differential switch according to claim 1, characterized in that: The shell (1) is made of aluminum alloy.

5. A heating type water pressure differential switch according to claim 1, characterized in that: A wire (14) connecting the heating body (13) and the micro switch (8) extends from a wire outlet (2) below the housing (1) to connect to an external power source.

6. A heating type water pressure differential switch according to claim 1, characterized in that: The heating body (13) is a PTC heating plate.

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