Explosion-proof type proportion electromagnet with displacement feedback

Abstract

An explosion-proof type proportion electromagnet with a displacement feedback function comprises a magnet yoke, a coil and a magnetic core tube, the magnetic core tube comprises static iron and a guide sleeve which are fixedly connected together, moving iron is installed in a cavity of the guide sleeve in a sliding mode, a push rod is fixedly connected to the moving iron, and the front end of the push rod penetrates through a push rod hole formed in the static iron. The upper portion of the magnet yoke is fixedly connected with an explosion-proof shell with a cavity, the explosion-proof shell and the magnet yoke are combined through an explosion-proof plane and then are fixedly connected through screws, the upper portion of the explosion-proof shell is provided with an opening, the opening is fixedly connected with an upper cover through screws, and the upper cover and the explosion-proof shell are combined through the explosion-proof plane. The circuit board is installed in a cavity of the explosion-proof shell, the magnet yoke is provided with a hole which is the same as the cavity of the explosion-proof shell, a connection guide of the coil is connected to the circuit board through the hole, the money outlet tube is installed on the explosion-proof shell, the length-diameter ratio of the magnetic core tube is larger than 4: 1, and the length-diameter ratio refers to the ratio of the length of the magnetic core tube to the outer diameter of the guide sleeve. The electromagnet is low in cost.

Description

Technical Field

[0001] The utility model relates to an electromagnet, in particular to an explosion-proof proportional electromagnet with displacement feedback, belonging to the technical field of electromagnetic devices. Background Art

[0002] Flameproof proportional electromagnets are widely used in occasions with dangerous gas and liquid control. With displacement feedback, closed-loop or plate closed-loop control can be achieved. There are many kinds of traditional explosion-proof electromagnets in the existing technology, and different technical solutions are also disclosed in Chinese patent applications, such as an explosion-proof electromagnet disclosed in the earlier Chinese patent application No. 2011205268653, an explosion-proof electromagnet device disclosed in Chinese patent application No. 2018114552778, and an explosion-proof electromagnet disclosed in Chinese patent application No. 2022219779497 in recent years. From the technical solutions of this type of electromagnet developed for more than ten years, this type of electromagnet mainly focuses on the explosion-proof of the lead sleeve. In the proportional electromagnet, it is necessary to control the current passed to control the size of the output end, so a control module is needed. The existing flameproof electromagnet focuses on the explosion-proof of the electromagnet. The explosion-proof electromagnet generally has only three leads, which mainly lead out the electrical connection line of the coil to the external control module. The control module also needs to be installed in an independent explosion-proof body, which results in high cost and large space occupation, which is not conducive to the integration of electrical control systems. For flameproof proportional solenoids, there are currently few integrated displacement feedback sensors, which makes it difficult to adapt to the requirements of individual occasions requiring closed-loop control. Summary of the invention

[0003] The utility model aims to overcome the above problems existing in the current proportional electromagnet in use and to provide a flameproof proportional electromagnet with displacement feedback.

[0004] To achieve the purpose of the utility model, the following technical scheme is adopted: a flameproof proportional electromagnet with displacement feedback, comprising a yoke, a coil, and a magnetic core tube, the coil is installed in the yoke, the magnetic core tube passes through the coil, the magnetic core tube comprises a static iron and a guide sleeve fixedly connected together, the moving iron is slidably installed in the cavity of the guide sleeve, the push rod is fixedly connected to the moving iron, the front end of the push rod passes through the push rod hole opened on the static iron, a flameproof shell with a cavity is fixedly connected to the upper part of the yoke, the flameproof shell and the yoke are connected by a flameproof plane and then fixedly connected by screws, the upper part of the flameproof shell has an opening, the opening is fixedly connected with an upper cover by screws, the upper cover and the flameproof shell are connected by a flameproof plane, the circuit board is installed in the cavity of the flameproof shell, the yoke is provided with a hole identical to the cavity of the flameproof shell, the connection guide of the coil is connected to the circuit board through the hole, the money-out tube is installed on the flameproof shell, the length-to-diameter ratio of the magnetic core tube is greater than 4:1, and the length-to-diameter ratio refers to the ratio of the length of the magnetic core tube to the outer diameter of the guide sleeve.

[0005] Furthermore, an LVDT displacement sensor is installed in the cavity at the rear of the yoke, a threaded hole is processed on the rear wall of the guide sleeve cavity, a support sleeve is screwed into the threaded hole through a thread, the rear part of the push rod is inserted into the support sleeve, the sensing core of the LVDT sensor is fixedly connected to the push rod, the support sleeve has a spring limiting part, the sensing ring of the LVDT sensor is sleeved on the support sleeve, a spring is inserted into the support sleeve between the front end of the sensing ring and the spring limiting part, the rear end of the support sleeve has an external thread, a fastening nut is screwed onto the external thread, the fastening nut is directly or indirectly pressed on the rear end of the sensing ring, and the wire of the LVDT sensor is connected to the circuit board in the cavity of the explosion-proof casing through the hole opened on the yoke.

[0006] Furthermore, a washer is provided between the fastening nut and the rear end of the sensing ring.

[0007] Furthermore, the front end of the magnetic core tube is interference-fitted in the circular hole at the front end of the magnetic yoke through a cylindrical explosion-proof surface, and the rear cover is also interference-fitted in the circular hole at the rear of the magnetic yoke through a cylindrical explosion-proof surface.

[0008] The positive and beneficial effects of the utility model are: the magnetic core tube of the electromagnet is slender, and the manufactured electromagnet is not large in size. The split-type connected magnetic yoke and flameproof casing can reduce the cost of the electromagnet. After being equipped with an LVDT displacement sensor, it can be used in occasions requiring closed-loop control and other high requirements. The specific effects are explained in conjunction with the specific implementation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is the overall diagram of the electromagnet.

[0010] Figure 2 It is a vertical sectional schematic diagram of the utility model.

[0011] Figure 3 is a schematic diagram of a magnetic core tube.

[0012] Figure 4 It is a schematic diagram of the LDVT displacement sensor.

[0013] Figure 5 It is a top view schematic diagram of a horizontal section of the flameproof enclosure. DETAILED DESCRIPTION

[0014] In order to more fully explain the implementation of the utility model, implementation examples of the utility model are provided. These implementation examples are only for the purpose of illustrating the utility model and do not limit the scope of the utility model.

[0015] The present invention is further explained in detail in conjunction with the accompanying drawings, in which the marks are: 1: yoke; 2: flameproof casing; 3: upper cover; 4: magnetic core tube; 5: push rod; 6: back cover; 7: cable; 8: coil; 9: static iron; 10: guide sleeve; 11: support sleeve; 12: inductive core; 13: inductive ring; 14: fastening nut; 15: washer; 16: moving iron; 17: spring; 18: bolt; 19: outlet tube; 20: spring limiter.

[0016] As shown in the accompanying drawings, a flameproof proportional electromagnet with displacement feedback includes a yoke 1, a coil 8, and a magnetic core tube 4. The coil is installed in the yoke, and the magnetic core tube passes through the coil. The front end of the magnetic core tube is interference-fitted in the circular hole at the front end of the yoke through a cylindrical flameproof surface. The magnetic core tube includes a static iron 9 and a guide sleeve 10 fixedly connected together. The moving iron 16 is slidably installed in the cavity of the guide sleeve. The push rod 5 is fixedly connected to the moving iron. The front end of the push rod passes through the push rod hole opened on the static iron. A flameproof housing 2 with a cavity is fixedly connected to the upper part of the yoke. The flameproof housing and the yoke are fixedly connected by screws 18 after being combined by a flameproof plane. The upper part of the flameproof housing has an opening, and an upper cover 3 is fixedly connected to the opening by screws. The upper cover and the flameproof housing are combined by a flameproof plane. Figure 2 The plane flameproof surface shown in A is a circuit board installed in the cavity of the flameproof shell. The yoke is provided with a hole identical to the cavity of the flameproof shell. The connection guide of the coil is connected to the circuit board through the hole. The outlet pipe 19 is installed on the flameproof shell. The cable 7 is led out from the outlet pipe. The cable adopts a 7-core cable and can connect more locations. The aspect ratio of the magnetic core tube is greater than 4:1. The aspect ratio refers to the ratio of the length of the magnetic core tube to the outer diameter of the guide sleeve. Such an aspect ratio makes the magnetic core tube slender and makes room for the flameproof shell in height.

[0017] An LVDT displacement sensor is installed in the cavity at the rear of the yoke, a threaded hole is processed on the rear wall of the guide sleeve cavity, a support sleeve 11 is screwed into the threaded hole through a thread, the rear part of the push rod 5 is inserted into the support sleeve, the inductive core 12 of the LVDT sensor is fixedly connected to the push rod, the support sleeve has a spring limiter 20, the inductive ring 13 of the LVDT sensor is sleeved on the support sleeve, a spring 17 is inserted into the support sleeve between the front end of the inductive ring 13 and the spring limiter, the rear end of the support sleeve has an external thread, a fastening nut 13 is screwed onto the external thread, a washer 15 is arranged between the fastening nut and the rear end of the inductive ring, the wire of the LVDT sensor is connected to the circuit board in the cavity of the flameproof housing through the hole opened on the yoke, a rear cover is fixedly installed on the yoke at the rear end of the LVDT sensor, and the rear cover is also interference-fitted in the circular hole at the rear of the yoke through a cylindrical flameproof surface, Figure 2 The ones shown in B are all cylindrical explosion-proof surfaces.

[0018] In this electromagnet, the yoke and the flameproof housing are two independent parts connected by a flameproof plane. They can be processed separately with smaller materials during production, which can reduce costs. The control circuit board is directly integrated in the cavity of the flameproof housing. The control part does not need a separate explosion-proof design and can be directly connected through cables. The LVDT displacement sensor is integrated at the rear end of the electromagnet, where the sensing core is connected to the armature assembly of the magnetic core tube assembly, so that the LVDT sensor can monitor the moving position of the armature assembly. The LVDT sensor can adjust the position of the sensing ring by tightening the nut.

[0019] After describing the implementation mode of the utility model in detail, people familiar with the technology can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the utility model are within the scope of the technical solution of the utility model, and the utility model is not limited to the implementation mode of the examples given in the specification.

Claims

1. A flameproof proportional electromagnet with displacement feedback, comprising a yoke, a coil, and a magnetic core tube, wherein the coil is installed in the yoke, and the magnetic core tube passes through the coil, wherein the magnetic core tube comprises a stationary iron and a guide sleeve fixedly connected together, and a moving iron is slidably installed in the cavity of the guide sleeve, and a push rod is fixedly connected to the moving iron, and the front end of the push rod passes through a push rod hole opened on the stationary iron, characterized in that: A flameproof housing with a cavity is fixedly connected to the upper part of the yoke, the flameproof housing and the yoke are connected by a flameproof plane and then fixedly connected by screws, the upper part of the flameproof housing has an opening, an upper cover is fixedly connected to the opening by screws, the upper cover and the flameproof housing are connected by a flameproof plane, the circuit board is installed in the cavity of the flameproof housing, the yoke is provided with a hole identical to the cavity of the flameproof housing, the connection guide of the coil is connected to the circuit board through the hole, the money outlet tube is installed on the flameproof housing, the length-to-diameter ratio of the magnetic core tube is greater than 4:1, and the length-to-diameter ratio refers to the ratio of the length of the magnetic core tube to the outer diameter of the guide sleeve.

2. The flameproof proportional solenoid with displacement feedback according to claim 1, characterized in that: An LVDT displacement sensor is installed in the cavity at the rear of the yoke, a threaded hole is processed on the rear wall of the guide sleeve cavity, a support sleeve is screwed into the threaded hole through a thread, the rear part of the push rod is inserted into the support sleeve, the sensing core of the LVDT sensor is fixedly connected to the push rod, the support sleeve is provided with a spring limiting part, the sensing ring of the LVDT sensor is sleeved on the support sleeve, a spring is inserted into the support sleeve between the front end of the sensing ring and the spring limiting part, the rear end of the support sleeve is provided with an external thread, a fastening nut is screwed onto the external thread, the fastening nut is directly or indirectly pressed on the rear end of the sensing ring, and the wire of the LVDT sensor is connected to the circuit board in the cavity of the flameproof housing through the hole opened in the yoke.

3. The flameproof proportional electromagnet with displacement feedback according to claim 2, characterized in that: A washer is arranged between the fastening nut and the rear end of the sensing ring.

4. The flameproof proportional electromagnet with displacement feedback according to claim 1, characterized in that: The front end of the magnetic core tube is interference-fitted in the circular hole at the front end of the magnetic yoke through a cylindrical explosion-proof surface, and the rear cover is also interference-fitted in the circular hole at the rear of the magnetic yoke through a cylindrical explosion-proof surface.

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