A liquid temperature relay for a rail vehicle

Abstract

The utility model belongs to relay equipment technical field especially relates to a liquid temperature relay for track locomotive, including temperature drive room, temperature drive room top end connecting cavity, cavity top end fixed support platform, support platform center hole, support platform one end top vertical fixed sensor, sensor is concave, the recess is along vertical center line symmetry, temperature drive room built -in sleeve, sleeve is equipped with expansion medium in, and sleeve is connected piston in, piston one end is connected with sleeve inner wall sliding, the other end passes through sleeve top end and connects the jackscrew, and the jackscrew top end passes through support platform center and connects drive link, the other end of drive link is connected adjusting rod, and the one end of drive link and jackscrew connection is spiral spring shape, and adjusting rod is placed in sensor recess middle. The relay simple structure, miniaturization, light weight, safe operation, adjusting rod and sensor between no contact connection, avoid because action number increases and cause mechanical fatigue, contact wear and contact oxidation problem.

Description

Technical Field

[0001] This utility model belongs to the field of relay equipment technology, and in particular relates to a liquid temperature relay for rail locomotives. Background Technology

[0002] Temperature relays are widely used electrical components in the electrical control system of rail locomotives. Their reliability and lifespan directly affect the reliability and safety of the entire rail locomotive equipment. When connecting or disconnecting high-power loads, temperature relays may experience contact jitter, vibration, arcing, and burning, resulting in abnormal contact resistance, contact sticking, and other faults. This leads to defects such as poor switching dynamic characteristics and short electrical life. Among these, liquid temperature relays account for a large proportion of the failure rate of rail locomotive equipment, with contact burning and poor contact being the main causes of contact failures.

[0003] In the main control circuit of a rail locomotive, the rail locomotive liquid temperature relay typically uses a mechanically interlocked DC contact type electrical contact with silver alloy contacts. In operation, the silver alloy contacts, through a mechanical interlocking device, control the connection or disconnection of the required electrical signals and transmit them to the rail locomotive control circuit. The rail locomotive control circuit then transmits the electrical control commands to the actuators to control the motor operation within the rail locomotive control circuit. In actual use, due to frequent shunting operations, the number of times several sets of rail locomotive liquid temperature relays operate increases, leading to a buildup of silver alloy contacts. Problems such as loose mounting screws of the contact linkage device and mechanical fatigue of the mechanical interlocking device with silver alloy contacts can occur. At the same time, frequent friction between the contacts can cause wear and tear, leading to poor contact. The instantaneous electric arc can damage the contacts and cause poor contact, resulting in the railcar control commands not being transmitted to the railcar control PLC in a timely manner, causing the railcar to malfunction. The only way to eliminate the above defects is to polish the contacts with alcohol and fine sandpaper and adjust the contact spacing. However, over time, the contact life is greatly reduced, leading to a high failure rate and poor stability of the railcar.

[0004] During operation, traditional rail locomotive liquid temperature relays are affected by various external environmental factors, such as iron powder, coal powder, dust, and moisture. Dust, iron powder, and oil adhere to the iron core and contact mechanism, generating residual magnetism over time. Furthermore, the frequent action of the mechanical contacts leads to severe metal fatigue and sluggish mechanical operation. Even when the stop button is pressed, the rail locomotive liquid temperature relay will always release after a delay. While this type of traditional rail locomotive liquid temperature relay performs well initially, with prolonged use, the mechanical contacts in the locomotive's electrical auxiliary control circuit inevitably experience mechanical fatigue, oxidation, and physical deformation, resulting in poor circuit contact and a rising failure rate of the liquid temperature relay, leading to frequent rail locomotive equipment malfunctions. Utility Model Content

[0005] The purpose of this invention is to provide a liquid temperature relay for rail locomotives, which solves the problems of mechanical fatigue, contact wear and contact oxidation caused by the increased number of operations of traditional rail locomotive liquid temperature relays.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A liquid temperature relay for rail locomotives includes a temperature drive chamber. A cavity is connected to the top of the temperature drive chamber, and a support platform is fixed to the top of the cavity. The support platform has a central opening, and a sensor is vertically fixed above one end of the support platform. The sensor is concave, with the groove symmetrical along a vertical center line. A sleeve is placed inside the temperature drive chamber, containing an expansion medium. A piston is connected inside the sleeve, with one end slidably connected to the inner wall of the sleeve and the other end passing through the top of the sleeve and connecting to a push rod. The top of the push rod passes through the center of the support platform and connects to a drive linkage. The other end of the drive linkage is connected to an adjusting rod. The end of the drive linkage connected to the push rod is a helical spring, and the end connected to the adjusting rod is a circle. The adjusting rod is positioned in the center of the sensor groove.

[0008] Preferably, the sensor is fixed to the support platform by bolts.

[0009] Preferably, the temperature driving chamber is made of a corrosion-resistant material.

[0010] Working principle: The bottom of the temperature drive chamber extends into the liquid being measured. When the temperature of the liquid reaches the set temperature value (the set temperature value is related to the temperature characteristics of the expansion medium, which is added as needed), the expansion medium in the temperature drive chamber expands, pushing the piston. The piston pushes the push rod upward, which in turn moves the drive connecting rod upward. Since one end of the drive connecting rod is a helical spring, it has a damping effect, slowly moving the adjusting rod upward. The adjusting rod moves out of the space between the concave sensors and reaches above the sensors. The adjusting rod then leaves the laser emission and reception area of ​​the sensor, activating the transistor sensing circuit of the sensor. This activates the corresponding rail locomotive control circuit (such as the cooling system circuit of the liquid being measured), and the rail... The corresponding control system of the rail locomotive enters normal operation; as the cooling system operates, the temperature of the measured liquid decreases to the set value, the temperature-driven expansion medium in the chamber contracts, the spiral spring-shaped end of the drive rod has a restoring function, causing the push rod to move down, pushing the piston down, and at the same time the push rod drives the drive connecting rod to move down, the drive connecting rod drives the adjusting rod to move down, the adjusting rod enters the sensor groove, the internal transistor sensing circuit of the sensor is disconnected, the corresponding rail locomotive control circuit (such as the cooling system circuit of the measured liquid) is disconnected, the corresponding control system of the rail locomotive enters the disconnected state and stops operating; when the temperature of the measured liquid rises to the set temperature value, the relay works in a cycle.

[0011] The beneficial effects achieved by this utility model are as follows:

[0012] (1) The piston is adjusted by utilizing the principle of thermal expansion and contraction of the expansion medium, so that the adjusting rod moves up and down to control the on and off of the circuit. There is no contact connection between the adjusting rod and the sensor, which avoids mechanical fatigue, contact wear and contact oxidation caused by the increase in the number of actions.

[0013] (2) The relay has a simple structure, is small and lightweight, does not require workers to approach, reduces safety hazards, is safe and reliable to operate, and is quick and convenient to inspect and maintain, effectively reducing the failure rate of rail locomotives;

[0014] (3) The temperature-driven chamber and cavity are designed to be waterproof, dustproof, and highly adaptable to the environment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0016] Figure 2 This is a front sectional view of an embodiment of the present utility model.

[0017] Explanation of reference numerals in the attached drawings: 1. Temperature drive chamber; 2. Cavity; 3. Support platform; 4. Adjusting rod; 5. Sensor; 6. Sleeve; 7. Expansion medium; 8. Piston; 9. Push rod; 10. Drive linkage. Detailed Implementation

[0018] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1-2 As shown, a liquid temperature relay for a rail locomotive includes a temperature drive chamber 1, a cavity 2 connected to the top of the temperature drive chamber 1, a support platform 3 fixed to the top of the cavity 2, a central opening on the support platform 3, and a sensor 5 vertically fixed to one end of the support platform 3 by bolts. The sensor 5 is concave, with the groove symmetrical along the vertical center line. A sleeve 6 is built into the temperature drive chamber 1, and an expansion medium 7 is placed inside the sleeve 6. A piston 8 is connected inside the sleeve 6, with one end of the piston 8 slidably connected to the inner wall of the sleeve 6, and the other end passing through the top of the sleeve 6 and connected to a push rod 9. The top of the push rod 9 passes through the center of the support platform 3 and is connected to... The drive link 10 is connected to the adjusting rod 4 at the other end. The end of the drive link 10 connected to the push rod 9 is in the shape of a helical spring, and the end connected to the adjusting rod 4 is in the shape of a circle. The adjusting rod 4 is placed in the middle of the groove of the sensor 5. The temperature drive chamber and cavity prevent dust, iron powder, and oil from adhering to the piston, thus preventing the piston from not being able to drive the push rod flexibly. The piston is driven by an expansion medium to prevent mechanical fatigue caused by the increased number of contact actions. The sensor and adjusting rod are connected without contact points to avoid contact wear and contact oxidation, which can lead to contact damage and poor contact.

[0020] The application process of the relay in this embodiment is as follows: The relay is used to control the cooling system of the liquid being measured. The bottom end of the temperature drive chamber 1 extends into the liquid being measured. When the temperature of the liquid being measured rises to 78 degrees Celsius, the expansion medium 7 in the temperature drive chamber 1 expands and pushes the piston 8. The piston 8 pushes the push rod 9 upward, and the push rod 9 drives the drive connecting rod 10 upward. One end of the drive connecting rod 10 is a helical spring, which has a damping effect, and slowly drives the adjusting rod 4 upward. The adjusting rod 4 moves out of the space between the concave sensors 5 and reaches above the sensors 5. The adjusting rod 4 is removed from the laser emission and reception area of ​​the sensors 5, and the transistor sensing circuit of the sensors 5 is turned on accordingly. When the cooling system circuit is connected, as the cooling system operates, the temperature of the measured liquid drops to 65 degrees Celsius (or below 65 degrees Celsius). The expansion medium 7 in the temperature-driven chamber 1 contracts, and the spiral spring-shaped end of the drive rod 10 has a restoring function, causing the push rod 9 to move down and pushing the piston 8 down. At the same time, the push rod 9 drives the drive rod 10 to move downward, and the drive rod 10 drives the adjusting rod 4 to move down. The adjusting rod 4 enters the groove between the sensor 5, and the internal transistor sensing circuit of the sensor 5 is disconnected. The corresponding cooling system circuit is disconnected, and the cooling system stops operating. When the temperature of the measured liquid rises to the set temperature value, the relay works in a cycle.

Claims

1. A liquid temperature relay for rail locomotives, characterized in that, The device includes a temperature driving chamber, with a cavity connected to its top. A support platform is fixed to the top of the cavity, and the support platform has a central opening. A sensor is vertically fixed above one end of the support platform. The sensor is concave, and the groove is symmetrical along the vertical center line. A sleeve is placed inside the temperature driving chamber, and an expansion medium is installed inside the sleeve. A piston is connected inside the sleeve, with one end of the piston slidingly connected to the inner wall of the sleeve and the other end passing through the top of the sleeve and connecting to a push rod. The top of the push rod passes through the center of the support platform and connects to a drive connecting rod. The other end of the drive connecting rod is connected to an adjusting rod. The end of the drive connecting rod connected to the push rod is a helical spring, and the end connected to the adjusting rod is a circle. The adjusting rod is placed in the middle of the sensor groove.

2. A liquid temperature relay for rail locomotives according to claim 1, characterized in that, The sensor is fixed to the support platform with bolts.

3. A liquid temperature relay for rail locomotives according to claim 1, characterized in that, The temperature-driven chamber is made of corrosion-resistant material.

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