Short-delay overload protection three-phase pressure switch

Abstract

The utility model provides a short-time-delay overload protection three-phase pressure switch, which relates to the technical field of pressure switches and comprises a connector assembly module, a pressure module, a thermal relay protection module and a contact module, the pressure module and the thermal relay protection module are both connected with the contact module, and the thermal relay protection module comprises a bimetallic strip assembly, a guide push plate and a temperature compensation plate. The bimetallic strip assembly is connected with the guide push plate, when the bimetallic strip assembly changes, the guide push plate moves, the guide push plate moves for a certain distance and then drives the temperature compensation sheet to act, and the temperature compensation sheet is connected with the contact module. Through the structure of a pressure switch function and an overload protection function, the switch not only can control the start and stop of a motor or other equipment according to the pressure change, but also can realize the function of cutting off a circuit after the motor or other equipment is overloaded for a short time, thereby making up for the defects of a traditional application scheme, effectively saving the installation space, and reducing the cost. And terminal wiring is more convenient and faster.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure switches, in particular to a short-delay overload protection three-phase pressure switch. Background Art

[0002] Three-phase pressure switches are mainly used in air compressors. Currently, the three-phase pressure switches on the market mainly realize the start and stop control of the motor. However, in some applications with higher requirements, not only the start and stop control of the motor must be met, but also certain protection of the motor must be provided. The traditional approach is to use a three-phase pressure switch plus a thermal relay to meet the start and stop control and overload protection of the motor. This solution is not only cumbersome in wiring, but also occupies a large space, which brings great inconvenience to the terminal use. In view of the above defects, this application is proposed. Utility Model Content

[0003] The purpose of the utility model is to provide a short-delay overload protection three-phase pressure switch. According to the operating characteristics of the motor, the motor is allowed to be overloaded for a short time during operation, but not for a long time. The switch can not only control the start and stop of the motor, but also realize the function of cutting off the circuit after the motor is overloaded for a short time, which makes up for the shortcomings of traditional application solutions, effectively saves installation space, and makes terminal wiring more convenient and quick.

[0004] In order to solve the above problems, the utility model provides a short-delay overload protection three-phase pressure switch, including a joint assembly module, a pressure module, a thermal relay protection module and a contact module. The pressure module and the thermal relay protection module are both connected to the contact module. The thermal relay protection module includes a bimetallic strip assembly, a push plate and a temperature compensation plate. The bimetallic strip assembly is connected to the push plate. When the bimetallic strip assembly changes, the push plate moves. After the push plate moves a certain distance, it will drive the temperature compensation plate to move. The temperature compensation plate is connected to the contact module.

[0005] According to an embodiment of the utility model, the short-delay overload protection three-phase pressure switch also includes a pressure difference module.

[0006] According to an embodiment of the present utility model, the contact module includes a moving contact, and the moving contact is a square structure.

[0007] According to an embodiment of the utility model, the contact module further includes a reset knob, the reset knob is connected to the moving contact, and the temperature compensation sheet is used to drive the reset knob.

[0008] According to an embodiment of the present utility model, the pressure module includes a transmission head, a springboard and a transmission frame, and the transmission frame is connected to the contact module.

[0009] According to an embodiment of the utility model, the joint assembly module includes a joint, a diaphragm, a diaphragm pressure plate and a diaphragm cover.

[0010] According to an embodiment of the present invention, the connector is a single-way connector or a multi-way connector.

[0011] According to an embodiment of the utility model, the bimetallic strip components are provided in three groups.

[0012] The beneficial effect of the utility model is that, by structuring the pressure switch function and the overload protection function, the switch can not only control the start and stop of the motor or other equipment according to the pressure change, but also realize the function of cutting off the circuit after the motor or other equipment is overloaded for a short time, which makes up for the shortcomings of traditional application solutions, effectively saves installation space, and makes terminal wiring more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the structure of a three-phase pressure switch for short-time delay overload protection;

[0015] Figure 2 It is a schematic diagram of the structure of the temperature compensation sheet and the reset knob;

[0016] Figure 3 It is a structural schematic diagram of the joint assembly module;

[0017] Figure 4 It is a structural diagram of the thermal relay protection module;

[0018] Figure 5 It is a schematic diagram of the structure of the contact module. 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] A short-delay overload protection three-phase pressure switch, such as Figure 1 , including a connector assembly module 1, a pressure module 2, a thermal relay protection module 3 and a contact module. The pressure module 2 and the thermal relay protection module 3 are both connected to the contact module. The pressure module 2 is used to respond to the pressure at the connector assembly module and control the opening and closing of the contact module. The thermal relay protection module 3 is used to detect current. When the current exceeds the set value, the contact module is controlled to be disconnected.

[0021] Specifically, it also includes a pressure difference module, a connector assembly module 1, a pressure module 2, a pressure difference module and a contact module to form a traditional pressure switch, such as the pressure switch disclosed in the company's prior patent CN201220605655.8 a pressure difference pressure switch, CN201520446214.1 pressure controller, etc., the connector assembly module 1 is as follows Figure 3 As shown, it is mainly composed of a joint 101, a diaphragm 102, a diaphragm pressure plate 103 and a diaphragm cover 104. The joint 101 can be set to a single-way, four-way or other type of joint according to actual needs. The pressure module 2 is mainly composed of a transmission head 201, a springboard 202 and a transmission frame 301. When the diaphragm 102 moves, the transmission head 201 moves to press the springboard 202, and the springboard 202 rotates around the rotating shaft to which it is connected to overcome the spring pressure, thereby causing the transmission frame 301 to move. After the transmission frame 301 moves downward, the moving and static contacts in the contact module can be separated to achieve the on-off control of the circuit. The transmission frame 301 generally controls the movement of the moving contact frame. When the pressure drops to the set value, the moving contact frame resets and restores the closed state. The pressure differential module is a module for realizing pressure differential regulation, generally including a pressure differential bolt and a pressure differential spring. The pressure differential bolt is used to adjust the tension of the pressure differential spring on the springboard to achieve pressure differential regulation. The above-mentioned pressure switch part is the prior art and will not be described in detail here.

[0022] like Figure 4 The thermal relay protection module 3 includes a bimetallic strip component 302, a push plate 303 and a temperature compensation sheet 304. The bimetallic strip component 302 is generally arranged in three groups and connected to the circuit. The bimetallic strip component 302 is connected to the push plate 303. When the peripheral circuit causes the motor to be overloaded due to phase failure or short circuit, the bimetallic strip component 302 will bend and deform due to continuous heating, pushing the push plate 303 to move. After the push plate 303 moves a certain distance, it will drive the temperature compensation sheet 304 to move. The temperature compensation sheet 304 drives the reset knob 305 (not limited to a knob, it can also be a push-type switch, etc., connected to the contact or contact sheet or contact frame) to move, so that the switch is reset and the contact is driven to disconnect, thereby achieving the purpose of protecting the motor.

[0023] Preferably, if Figure 5 The moving contact 306 is a square structure, that is, the silver point structure is changed from the original rivet type to a square type, and is fixed to the terminal by induction welding. The contact gap is increased, which greatly improves the electrical life of the product.

[0024] This solution proposes a pressure switch for oil, water, air, non-flammable gas and various corrosive gases. When the system pressure exceeds the set value, the switch is disconnected and the motor stops rotating. When the motor current exceeds the set value of the thermal relay, the switch will disconnect the motor circuit within two minutes, thereby achieving the purpose of protecting the motor. The overload protection three-phase pressure switch mainly includes two parts: the mechanical switch body and the thermal relay part; the mechanical switch body is composed of a connector diaphragm assembly, a pressure and pressure difference assembly, and its main function is to connect to the external pipeline and provide power for the on-off of the relay; the function of the thermal relay part is to switch the state of the motor and serve as an overload protection circuit for the motor; the mechanical part realizes the adjustable pressure and pressure difference of the detection switch, and the user can set the corresponding pressure and pressure difference according to the on-site working conditions.

[0025] Switch operating principle: Gas or liquid flows into the joint assembly to drive the transmission head upward. Under the action of the torsion spring, the spring plate swings downward and moves downward through the transmission frame. Finally, the relay switches from the normally closed state to the normally open state.

[0026] When the switch is in normal operation (the switch is normally closed), the current in the motor circuit exceeds the rated current of the motor, and the bimetallic strip assembly 302 will deform due to the heat generated, and act on the push plate 303, causing it to slide. After sliding to a certain distance, it drives the temperature compensation sheet 304 to move. The other end of the temperature compensation sheet acts on the reset knob 305, and the reset knob drives the relay to reset, and the switch is disconnected.

[0027] 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 short-delay overload protection three-phase pressure switch, characterized in that: The invention comprises a joint assembly module (1), a pressure module (2), a thermal relay protection module (3) and a contact module. The pressure module (2) and the thermal relay protection module (3) are both connected to the contact module. The thermal relay protection module (3) comprises a bimetallic strip assembly (302), a guide push plate (303) and a temperature compensation plate (304). The bimetallic strip assembly (302) is connected to the guide push plate (303). When the bimetallic strip assembly (302) changes, the guide push plate (303) moves. After the guide push plate (303) moves a certain distance, it drives the temperature compensation plate (304) to move. The temperature compensation plate (304) is connected to the contact module.

2. The short-delay overload protection three-phase pressure switch according to claim 1 is characterized in that: The short-time overload protection three-phase pressure switch also includes a differential pressure module.

3. The short-delay overload protection three-phase pressure switch according to claim 1 or 2, characterized in that: The contact module comprises a moving contact (306), and the moving contact (306) is a square structure.

4. The short-delay overload protection three-phase pressure switch according to claim 3 is characterized in that: The contact module also includes a reset knob (305), the reset knob (305) is connected to the moving contact (306), and the temperature compensation sheet (304) is used to drive the reset knob (305).

5. The short-delay overload protection three-phase pressure switch according to claim 1 is characterized in that: The pressure module (2) comprises a transmission head (201), a springboard (202) and a transmission frame (301), and the transmission frame (301) is connected to the contact module.

6. The short-delay overload protection three-phase pressure switch according to claim 1 or 5, characterized in that: The joint assembly module (1) comprises a joint (101), a diaphragm (102), a diaphragm pressing plate (103) and a diaphragm cover (104).

7. The short-delay overload protection three-phase pressure switch according to claim 6, characterized in that: The connector (101) is a single-way connector or a multi-way connector.

8. The short-delay overload protection three-phase pressure switch according to claim 1, characterized in that: The bimetallic strip components (302) are provided in three groups.

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