Detection switch capable of adjusting and controlling pressure

Abstract

A detection switch capable of adjusting control pressure belongs to the technical field of control switches and comprises a relay, a pressure resistor, a display mechanism and a detection mechanism. The detection mechanism comprises a cylinder, a piston, a spring, an adjusting plate, a reed switch, a magnet and a relay. The display mechanism is installed in the element box and electrically connected with the element box. According to the utility model, a worker can conveniently combine the number representing the pressure displayed by the voltmeter to accurately adjust the pressure threshold value, and can apply different pressures to the piston through the spring when the adjusting plate is adjusted up or down in place, so that when the piston and the magnet are pushed to move up in place by the corresponding pressure of air in the pipeline, the contact in the reed pipe is closed, and the pressure in the pipeline is reduced. The work of the production equipment is further controlled; the problem that in the prior art, threshold adjustment is carried out by observing numbers at the side end of an adjusting handle, and accurate pressure adjustment by workers is not facilitated is solved, the reed switch serves as a contact point, the probability that the movable contact and the static contact are in poor contact is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of control switch technology, and in particular to an adjustable control pressure detection switch. Background Technology

[0002] In some production fields, pipelines transporting fluids (including liquids or gases) typically employ pressure switches as sensors to maintain the fluid within the pipeline at a set pressure during actual transport (e.g., transporting natural gas or fuel liquid to the air or liquid inlet of other production equipment). The sensor probe is located inside the pipeline, and the sensor's signal output is connected to a control relay, etc. (The pressure signal output from the sensor can also enter an electric proportional valve; the valve opening decreases when the pressure is high and increases when the pressure is low). In operation, when the liquid or gas pressure in the pipeline is lower than the set value, the relay will not be energized, and the solenoid valve controlling the air or liquid inlet will not be energized and will open, allowing the fluid to continue flowing through the pipeline to other production equipment. When the liquid or gas pressure in the pipeline is higher than the set value, the relay will be energized, and the solenoid valve controlling the air or liquid inlet will close, temporarily preventing the fluid from flowing through the pipeline to other production equipment. Through this process, the fluid entering the relevant equipment can be maintained at the set pressure throughout the transport process.

[0003] While existing pipeline pressure switches meet production needs to some extent, their structural limitations also present the following technical drawbacks. Firstly, the normally open or normally closed moving and stationary contacts of the pressure switch, which control relays, are located within the switch's housing. This housing is not effectively and completely isolated from the outside air, allowing dust or airborne particles to easily come into contact with and act on the contacts, leading to contamination or oxidation. This negatively impacts the contacts' conductivity and, consequently, the normal operation of the controlled production equipment. Secondly, adjusting the control pressure relies solely on manual adjustment using the digital dial on the side of the adjustment handle. After a period of use, wear and tear on the dial makes precise pressure adjustment difficult, again negatively affecting the normal operation of the controlled production equipment. Therefore, it is essential to provide a detection switch that prevents oxidation and contamination of the stationary and moving contacts and allows for convenient pressure threshold adjustment by manual operators using digital dialing. Utility Model Content

[0004] In order to overcome the shortcomings of existing pressure switches due to structural limitations, as described in the background, this invention provides an adjustable pressure detection switch that allows operators to easily display digital pressure values ​​using a small voltmeter and precisely adjust the pressure threshold under the combined action of related mechanisms. Furthermore, by using a reed switch as the contact point, the probability of poor contact between the moving and stationary contacts is reduced.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An adjustable pressure detection switch includes a relay, a pressure resistor, a display mechanism, and a detection mechanism. The detection mechanism includes a cylinder, a piston, a spring, an adjusting plate, a reed switch, and a magnet. The cylinder has shaft holes at its upper and lower ends, and a fixing groove is installed on one side of the lower end of the cylinder. The reed switch is installed in the fixing groove. The outer side of the cylinder is hollow and has external threads. A guide rod is installed at the lower end of the piston. The piston is movably sleeved inside the lower end of the cylinder, and the guide rod slides within the shaft hole at the lower end of the cylinder. The spring is movably sleeved inside the cylinder, and the magnet is installed at the lower end of the guide rod. On the outside; the upper end of the pressure resistor is installed at the lower end of the adjusting plate, and a fixed seat is installed at the upper end of the cylinder shaft hole. There is a fixing bolt on one side of the fixed seat. An adjusting rod is installed at the upper end of the adjusting plate, and the adjusting rod slides in the fixed seat and the upper end shaft hole of the cylinder; the relay and display mechanism are installed in the component box, and the component box is installed outside the upper end of the adjusting rod; the signal output terminal of the pressure resistor and the signal input terminal of the display mechanism are electrically connected, the signal output terminal of the reed switch is connected to one of the power input terminals of the relay, and the control power output terminal of the relay is electrically connected to the power input terminal of the controlled production equipment.

[0007] Furthermore, the outer diameter of the adjusting plate is smaller than the inner diameter of the cylinder, and the outer diameter of the piston is larger than the inner diameter of the cylinder.

[0008] Furthermore, when the spring is in the extended state, the upper and lower ends of the spring are in contact with the lower end of the adjusting plate and the upper end of the piston, respectively.

[0009] Furthermore, the reed switch is a normally open contact reed switch, and the moving contact of the reed switch is located at the upper end of the fixed groove.

[0010] Furthermore, the outer diameter of the guide rod is smaller than the inner diameter of the shaft hole, and the outer diameter of the adjusting rod is smaller than the inner diameter of the shaft hole and the fixing groove.

[0011] Furthermore, when the magnet is at the top dead center, the magnet approaches the lower end of the reed switch, and the internal contacts of the reed switch close.

[0012] Furthermore, the display mechanism includes an adjustable resistor and a liquid crystal voltage display meter that are electrically connected, with the two ends of the adjustable resistor and the two terminals of the voltage display meter respectively connected.

[0013] Furthermore, the lower end of the guide rod has an open structure and the upper end has multiple vent holes.

[0014] Compared with the prior art, the advantages of this utility model are: (1) In this new model, the whole equipment is installed at the pipeline inspection station through the external thread on the outside of the cylinder. The external air can enter the cylinder through the gap between the guide rod and the shaft hole and the vent hole at the top of the hollow guide rod. The staff can conveniently combine the small voltmeter to display the digital value representing the pressure and make precise adjustment of the pressure threshold. When the adjustment plate is in place, the spring can apply different pressures to the piston. In this way, when the air pressure in the pipeline pushes the piston and magnet to the position, the internal contact of the reed switch closes, thereby controlling the operation of the production equipment. This overcomes the problem that the existing technology adjusts the threshold by observing the digital value on the side of the adjustment handle. After a period of use, the digital value is damaged due to wear and other reasons, which is not conducive to the staff's precise adjustment of the pressure. (2) Since the reed switch is used as the contact point, the probability of poor contact between the moving contact and the stationary contact is reduced, and the service life of the equipment is improved. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0017] Figure 2 This is a partial structural schematic diagram of the present invention.

[0018] Figure 3 This is the circuit diagram of this utility model. Detailed Implementation

[0019] Figure 1 , 2As shown in Figure 3, an adjustable pressure detection switch includes a power module U1, a relay K1, a pressure resistor RT, and a display mechanism 2 and a detection mechanism. The detection mechanism includes a cylinder 101, a piston 102, a spring 103, an adjusting plate 104, a reed switch GH, and a magnet 105. The cylinder 101 has a shaft hole 1011 at the middle of its upper and lower ends, and a fixing groove 1012 is welded to the outer right side of the lower end of the cylinder 101. The reed switch GH is laterally and tightly fitted onto the fixing groove. Inside the groove 1012, the outer side of the cylinder 101 is a hollow two-layer structure 1013, and the outer side of the cylinder 101 has external threads 1014; a guide rod 1021 is welded to the middle of the lower end of the piston 102, the piston 102 is movably sleeved inside the lower end of the cylinder 101, and the guide rod 1021 slides within the shaft hole 1011 at the lower end of the cylinder 101; the spring 103 is movably sleeved inside the middle of the cylinder 101 and located at the upper end of the piston 102; and the annular magnet CT is fixedly installed on the guide rod 1021. The lower outer end; the upper end of the pressure resistor RT is glued to the lower end of the insulating adjusting plate 104, and the force-bearing surface of the pressure resistor RT is located on the lower side. A hollow fixing seat 106 is welded to the shaft hole at the upper end of the cylinder. There is a threaded hole on the right side of the fixing seat 106, and a fixing bolt 107 is screwed into the threaded hole. An adjusting rod 108 is welded to the middle of the upper end of the adjusting plate 104. The adjusting rod 108 is movably sleeved in the fixing seat 106 and the shaft hole at the upper end of the cylinder. The wire connected to the reed switch GH passes through the cylinder 101. A hole is opened at the lower right end (the hole is sealed with sealant, and the wire is located at the upper outer end of the cylinder) to enter the hollow part on the right side of the cylinder 101 (the wire connected to the pressure resistor RT is led out upward through the hole at the right end of the adjusting plate 104 to enter the hollow part 1013 on the right side of the cylinder, the hole is sealed with sealant, and the wire is located at the upper outer end of the cylinder 101); the power module U1, relay K1, and display mechanism 2 are installed on the circuit board inside the component box 3, and the component box 3 is installed outside the upper end of the adjusting rod 108.

[0020] Figure 1 , 2As shown in Figure 3, the lower end of the guide rod has an open structure, and the upper end has multiple vent holes 10211. The outer diameter of the adjusting plate 104 is smaller than the inner diameter of the cylinder 101, and the outer diameter of the piston 102 (made of heat-resistant rubber) is slightly larger than the inner diameter of the cylinder 101. When the spring 103 is in the extended state, the upper and lower ends of the spring 103 are in contact with the adjusting plate 104 and the upper end of the piston 103, respectively. The reed switch GH is a normally open contact reed switch, and the moving contact of the reed switch GH is horizontally located at the upper end of the fixed groove 1012. The outer diameter of the guide rod 1021 is smaller than the inner diameter of the shaft hole, and the outer diameter of the adjusting rod 108 is smaller than the inner diameter of the shaft hole and the fixed groove. The middle part of the right end of the spring 103 and the reed switch are on the same vertical plane. When the magnet CT is at the top dead center, the magnet CT is close to the lower end of the reed switch GH, and the internal contacts of the reed switch GH are closed. The display mechanism includes an adjustable resistor R1 and a small liquid crystal voltage display meter V connected by circuit board wiring. The two ends of the adjustable resistor R1 are connected to the two terminals of the voltage display meter V, respectively. The power input terminals 1 and 2 of power module U1, the control power input terminal of relay K1, and the two poles of the 220V AC power supply are connected by wires. The power output terminals 3 and 4 of power module U1 are connected by wires to the power input terminal of the display mechanism, the negative power input terminal of the voltage display meter V, and the power input terminal of reed switch GH. The two ends of pressure resistor RT, one end of adjustable resistor R1 (signal input terminal of display mechanism), and the positive power output terminal 3 of power module U1 are connected by wires. The two normally open contacts of relay K1 are connected by wires to the power input terminals of the controlled production equipment T. The power output terminal of reed switch GH is connected to the positive power input terminal of relay K1, and the power output terminal 4 of power module U1 is connected to the negative power input terminal of relay K1. Figure 3 In this configuration, power module U1 is a finished product of AC 220V to DC 12V power module; adjustable resistor R1 has a resistance of 100K (adjusted to 23.5K in this embodiment); reed switch GH is a normally open contact reed switch; relay K1 is DC 12V; voltmeter V is a liquid crystal voltage display meter with a range of DC 12V; and pressure resistor RT is a finished product of resistance pressure sensor model BHF350-1.5EB.

[0021] Figure 1 , 2As shown in Figure 3, the new integrated device is installed at the pipeline inspection station via the external thread 1014 on the outer side of the cylinder. External air can enter the cylinder 101 through the gap between the guide rod 1021 and the shaft hole, as well as through the guide rod 1021 and the vent hole 10211. After the AC 220V power supply enters the power input terminal of the power module U1, the power module U1 outputs a stable DC 12V power supply through pins 3 and 4, which enters the power input terminals of the reed switch GH and the display mechanism. In this invention, when the operator loosens bolt 107 and holds adjusting plate 104 to adjust its height up or down, the pressure exerted on the pressure resistor RT by the lower end of adjusting plate 104 by the spring changes under the reverse elastic force of the spring. When the adjusting plate is adjusted downwards by a relatively large amount, the pressure exerted on the pressure resistor RT is relatively large (resistance value is relatively small). Thus, the voltage of the 12V power supply entering the voltage display meter V through the voltage divider of the pressure resistor RT and the adjustable resistor R1 is relatively high. When the adjusting plate is adjusted downwards by a relatively small amount, the pressure exerted on the pressure resistor RT is relatively small (resistance value is relatively large). Thus, the voltage of the 12V power supply entering the voltage display meter V through the voltage divider of the pressure resistor RT and the adjustable resistor R1 is relatively low. After adjustment, tighten the bolt. Through the above, this new invention, combined with the digital reading of the voltmeter V, allows for real-time monitoring of the downward adjustment height of the pressure resistor RT, thus revealing the threshold pressure within the subsequent control pipeline (for example, if the voltmeter V displays 2.15V, then when the pressure within the pipeline exceeds 2.15MPa, the magnet will approach the reed switch GH, causing the internal contacts of the reed switch GH to close). Since the voltmeter is housed within a sealed casing and displays digital data via an LCD, the readings are unaffected by wear and tear, overcoming the limitations of existing technologies that rely on observing the digital readings on the side of the adjustment handle for threshold adjustment. Furthermore, the wear and tear of these readings over time hinders precise pressure adjustment by operators.During operation, the pressure inside the pipeline enters the cylinder through the lower end shaft hole, guide rod gap, and vent hole. Piston 102 moves upwards along the lower end of the cylinder. The piston, through the elastic force of the spring, acts synchronously on the pressure resistance RT, causing the pressure to change synchronously. When the pressure inside the pipeline does not reach the pressure threshold set by the operator's adjustment plate, the upward distance of piston 103 is relatively small (the pressure exerted by the spring on the piston is relatively large, so the internal contacts of reed switch GH will only close when the pressure inside the pipeline is relatively high). The magnetic force of magnet CT will not act on reed switch GH, and the moving and stationary contacts inside reed switch GH will not close. Relay K1 remains de-energized, and the controlled production equipment T continues to not operate. When the pressure inside the pipeline reaches the pressure threshold set by the operator's adjustment plate... Because the piston 103 travels a relatively large distance upwards, after the magnet CT reaches the corresponding position, its right end contacts the lower end of the fixed groove. The force of the magnet CT acts on the reed switch GH, causing the moving and stationary contacts inside the reed switch GH to close. Consequently, the relay K1 is energized and its control power input terminal and normally open contact terminal close. In this way, the controlled production equipment T is energized and operates (such as a solenoid valve connected to the fluid pipe and the gas supply tank pipe). Since the reed switch is used as the contact point (the contact is sealed inside the glass shell), the probability of poor contact between the moving and stationary contacts is reduced, and the service life of the equipment is improved. (When the pressure in the pipeline is lower than the set threshold, the reed switch moves downwards, and the magnetic force of the magnet no longer acts on the reed switch GH, causing the moving and stationary contacts inside the reed switch GH to open.)

[0022] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0023] Furthermore, it should be understood that although this specification describes the embodiments, the embodiments do not necessarily contain only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pressure-adjustable detection switch, comprising a relay and a pressure resistor, characterized in that, It also includes a display mechanism and a detection mechanism; the detection mechanism includes a cylinder, a piston, a spring, an adjusting plate, a reed switch, and a magnet. The upper and lower ends of the cylinder have shaft holes, and a fixing groove is installed on one side of the lower end of the cylinder. The reed switch is installed in the fixing groove. The outer side of the cylinder is a hollow structure and has external threads. A guide rod is installed at the lower end of the piston. The piston is movably sleeved in the lower end of the cylinder, and the guide rod slides in the shaft hole at the lower end of the cylinder. The spring is movably sleeved inside the cylinder, and the magnet is installed on the outer side of the lower end of the guide rod. The upper end of the pressure resistor is installed at the lower end of the adjusting plate. A fixing seat is installed at the upper end of the cylinder shaft hole, and a fixing bolt is installed on one side of the fixing seat. An adjusting rod is installed at the upper end of the adjusting plate, and the adjusting rod slides in the fixing seat and the shaft hole at the upper end of the cylinder. The relay and the display mechanism are installed in a component box, and the component box is installed outside the upper end of the adjusting rod. The signal output terminal of the pressure resistor and the signal input terminal of the display mechanism are electrically connected. The signal output terminal of the reed switch is connected to one of the power input terminals of the relay. The control power output terminal of the relay is electrically connected to the power input terminal of the controlled production equipment.

2. The adjustable pressure detection switch according to claim 1, characterized in that, The outer diameter of the adjusting plate is smaller than the inner diameter of the cylinder, and the outer diameter of the piston is larger than the inner diameter of the cylinder.

3. The adjustable pressure detection switch according to claim 1, characterized in that, When the spring is in the extended state, the upper and lower ends of the spring, the lower end of the adjusting plate, and the upper end of the piston are in contact respectively.

4. The adjustable pressure detection switch according to claim 1, characterized in that, A reed switch is a normally open reed switch, and the moving contact of the reed switch is located at the upper end of the fixed slot.

5. The adjustable pressure detection switch according to claim 1, characterized in that, The outer diameter of the guide rod is smaller than the inner diameter of the shaft hole, and the outer diameter of the adjusting rod is smaller than the inner diameter of the shaft hole and the fixing groove.

6. The adjustable pressure detection switch according to claim 1, characterized in that, When the magnet is at the top dead center, it approaches the lower end of the reed switch, and the internal contacts of the reed switch close.

7. The adjustable pressure detection switch according to claim 1, characterized in that, The display mechanism includes an electrically connected adjustable resistor and a liquid crystal voltage display meter, with the two ends of the adjustable resistor and the two terminals of the voltage display meter connected respectively.

8. The adjustable pressure detection switch according to claim 1, characterized in that, The lower end of the guide rod has an open structure, while the upper end has multiple vent holes.

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