Temperature control circuit of pressure reducing valve heater

Abstract

The pressure reducing valve heater temperature control circuit comprises a temperature control module, a switch module and an induction module, the induction module is suitable for recognizing the outlet temperature of a pressure reducing valve and correspondingly releasing a positive feedback signal or a negative feedback signal according to the recognized temperature, and the switch module is suitable for controlling the heater to be connected or disconnected with a power source. The temperature control module is suitable for identifying the positive feedback signal and the negative feedback signal so as to respectively drive the switch module to connect and disconnect; through the synergistic effect of the temperature control module, the switch module and the sensing module, automatic opening and closing of the heater can be guaranteed, so that the temperature of the pressure reducing valve is kept within a set range, overheating or supercooling is avoided, and it is guaranteed that the pressure reducing valve works stably.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a heater, in particular to a temperature control circuit of a pressure reducing valve heater. BACKGROUND

[0002] The pressure reducing valve is a valve which reduces the inlet pressure to a required outlet pressure and keeps the outlet pressure stable automatically by relying on the energy of the medium itself.

[0003] However, during the pressure reduction of high-pressure gas, the temperature of the gas usually decreases, and the decrease is obvious when the gas flow is large, which easily causes the temperature at the outlet of the gas cylinder to decrease and even freeze, and the gas path to be blocked. Therefore, the application provides a temperature control circuit of a pressure reducing valve heater which automatically controls the working state of the heater to keep the outlet temperature of the pressure reducing valve within a reasonable range. CONTENT OF THE INVENTION

[0004] The application aims to provide a temperature control circuit of a pressure reducing valve heater.

[0005] To achieve the above purpose, the application adopts the technical scheme of a temperature control circuit of a pressure reducing valve heater, which comprises a temperature control module, a switching module and a sensing module, the sensing module is adapted to identify the outlet temperature of the pressure reducing valve and release a positive feedback signal or a negative feedback signal according to the identified temperature, the switching module is adapted to control the connection or disconnection of the power supply of the heater, and the temperature control module is adapted to identify the positive feedback signal and the negative feedback signal to drive the switching module to connect and disconnect, respectively.

[0006] As a preferred option, the sensing module comprises a control circuit with a settable temperature threshold, and the sensing module is adapted to continuously release the positive feedback signal during the whole process from when the temperature of the pressure reducing valve is lower than the lower limit of the temperature threshold to when it is lower than the upper limit of the temperature threshold, and to release the negative feedback signal when it is higher than the upper limit of the temperature threshold.

[0007] As a preferred option, the switching module comprises a relay and a contactor which are arranged in series, the contactor is provided with a first contact in series, the first contact and the relay are arranged in parallel, the first contact is used to control the opening and closing of the heater, and the temperature control module is adapted to drive the relay to close and disconnect to turn on or turn off the first contact.

[0008] As a preferred option, the first contact is provided with a first switch in parallel, and the first switch is closed to short-circuit the first contact.

[0009] As a preferred option, the first contact is provided with a second switch and a third switch in series on both sides, and the first contact, the second switch, the third switch and the relay are arranged in parallel.

[0010] As a preferred, the relay is provided with a fourth switch in series, which is used to manually control the on-off of the relay.

[0011] As a preferred, the temperature control module is set as a temperature controller, which releases the positive feedback signal to keep the relay on, and releases the negative feedback signal to turn off the relay.

[0012] As a preferred, the pressure reducing valve heater temperature control circuit further comprises a power indicator light connected with the power supply.

[0013] As a preferred, the pressure reducing valve heater temperature control circuit further comprises a running indicator light and a second contact in series, and the second contact is closed when the contactor is powered on, and the running indicator light and the second contact in series are connected with the power supply.

[0014] As a preferred, the sensing module is set as a temperature sensor, which is used to set temperature threshold and identify temperature.

[0015] Compared with the prior art, the application has the beneficial effects that:

[0016] Through the synergistic effect of the temperature control module, the switch module and the sensing module, the automatic opening and closing of the heater can be ensured, so that the temperature of the pressure reducing valve is kept within the set range, and overheating or overcooling is avoided, and the stable operation of the pressure reducing valve is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a schematic diagram of the temperature control circuit.

[0018] Figure 2 Fig. 2 is a main circuit diagram of the heater.

[0019] In the figure: HL1, power indicator light; HL2, running indicator light; TE1, temperature sensor; WK1, temperature controller; K, relay; KM, contactor; KM1, first contact; KM2, second contact; SB1, first switch; SB2, second switch; SB3, third switch; EH, heater. DETAILED DESCRIPTION

[0020] In the following, the application will be further described in conjunction with specific embodiments, and it should be noted that the following embodiments or technical features can be combined to form new embodiments without conflict.

[0021] In the description of this application, it should be noted that the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., which indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of this application.

[0022] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0023] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0024] Example:

[0025] A pressure reducing valve heater temperature control circuit, referenced Figure 1 As shown, the system includes a temperature control module, a switching module, and a sensing module. The sensing module is adapted to identify the outlet temperature of the pressure reducing valve and release a positive or negative feedback signal accordingly. The switching module is adapted to control the heater EH to connect or disconnect the power supply. The temperature control module is adapted to identify the positive and negative feedback signals to drive the switching module to connect and disconnect respectively, thereby controlling the heater EH to open or close. Through the coordinated action of the temperature control module, the switching module, and the sensing module, the automatic opening and closing of the heater EH can be ensured, thereby keeping the outlet temperature of the pressure reducing valve within the set range, avoiding overheating or overcooling, and ensuring stable operation of the pressure reducing valve.

[0026] The sensing module includes a control circuit with a settable temperature threshold. During the entire process from when the pressure reducing valve temperature is below the lower limit of the temperature threshold until it is below the upper limit, the sensing module is adapted to continuously release a positive feedback signal; when the temperature is above the upper limit, it is adapted to release a negative feedback signal. In this embodiment, the preferred temperature threshold is 10~40℃, meaning that when the temperature is below 10℃, the sensing module continuously releases a positive feedback signal. At this time, the temperature control module recognizes the signal and drives the switching module to turn on the heater EH. The main control circuit of the heater EH can be referenced... Figure 2The sensing module releases a negative feedback signal when the temperature rises to 40℃. The temperature control module recognizes this signal and drives the switching module to disconnect the heater EH, ensuring that the temperature of the pressure reducing valve is maintained within the set range. This process is repeated when the temperature drops below 10℃ again, thus keeping the outlet temperature of the pressure reducing valve within the temperature range of 10~40℃.

[0027] The switching module includes a relay K and a contactor KM connected in series. The contactor KM has a first contact KM1 connected in series, and the first contact KM1 and relay K are connected in parallel. The first contact KM1 controls the opening and closing of the heater EH. The temperature control module is adapted to drive the relay K to close and open, thereby opening or closing the first contact KM1. When the temperature is below 10℃, the temperature control module drives the relay K to close. At this time, the contactor KM is energized, and its first contact KM1 is correspondingly energized and closed. The heater EH then starts working, and current flows through the main control circuit to heat the pressure reducing valve, causing the temperature to gradually rise. When the temperature reaches and exceeds 40℃, the sensing module releases a negative feedback signal. Upon receiving the signal, the temperature control module drives the relay K to open, de-energizing the contactor KM, causing the first contact KM1 to open, and the heater EH to stop working, causing the temperature to gradually decrease. This cycle ensures that the temperature of the pressure reducing valve always fluctuates within the range of 10~40℃.

[0028] A first switch SB1 is connected in parallel with the first contact KM1. When the first switch SB1 is closed, the first contact KM1 is short-circuited. The first switch SB1 can be used as a manual switch instead of the first contact KM1.

[0029] A second switch SB2 and a third switch SB3 are connected in series on both sides of the first contact KM1. The first contact KM1, the second switch SB2, and the third switch SB3 are connected in parallel with the relay K. The second switch SB2 and the third switch SB3 are preferably manual switches, and these two switches are mainly used in conjunction with the first switch SB1. When the first switch SB1, the second switch SB2, and the third switch SB3 are all closed, the contactor KM is directly energized, thereby energizing and closing the first contact KM1. Figure 2 The heater EH, connected in series with the first contact KM1, can be energized without needing to close the relay K. Therefore, the three components together can be used as a manual switch. This design provides greater operational flexibility and allows for seamless switching between manual and automatic control.

[0030] The relay K is connected in series with a fourth switch, the fourth switch is... Figure 1 The switch to the left of number 3, the first switch and the third switch are preferably rotary switches, and the fourth switch is used to manually control the on and off of relay K. The fourth switch can be used as an emergency switch for heater EH. When the fourth switch is open, the corresponding relay K is open, and at this time the corresponding contactor KM is also open, and heater EH is in a de-energized state.

[0031] The temperature control module is configured with temperature controller WK1. Temperature controller WK1 releases a positive feedback signal to keep relay K continuously energized and open, and releases a negative feedback signal to de-energize relay K and close it. The temperature control module and the sensing module can be considered as a whole. The sensing module provides temperature data to the temperature control module, and the two work together. The temperature control module releases different feedback signals based on the temperature data to control whether relay K is energized or de-energized.

[0032] The temperature control circuit of the pressure reducing valve heater EH also includes a power indicator light HL1 that is connected to the power supply. The power indicator light HL1 can be set to white and is powered on when the power supply VC is turned on.

[0033] The temperature control circuit of the pressure reducing valve heater EH also includes a running indicator light HL2 and a second contact KM2 connected in series. The second contact KM2 closes when the contactor KM is energized. The running indicator light HL2 and the second contact KM2 connected in series are connected to the power supply. The running indicator light HL2 is preferably green (preferably a color different from the power indicator light HL1). When the relay K is energized, the first contact KM1 and the second contact KM2 close simultaneously. When the second contact KM2 is closed...

[0034] The sensing module is preferably configured as temperature sensor TE1, which is used to set the temperature threshold and perform temperature identification.

[0035] In this embodiment, a low-voltage operating voltage of DC24V is preferred. Considering the operating temperature range of the pressure reducer and the installation space, the XH-3002 type temperature controller is selected, with an operating voltage of DC24V and a temperature control range of -50-110℃; a 380V to DC24V, 60W power supply module is selected; and the JQX-10F / 2Z, DC24V relay with a contact capacity of 30VDC10A is selected.

[0036] The main working principle of this embodiment is as follows: A combination of temperature sensor TE1 and temperature controller WK1 is used to automatically start heating when the temperature is 10℃ or below, and to stop heating when the outlet temperature of the pressure reducing valve reaches 40℃. Temperature sensor TE1 transmits the collected temperature to temperature controller WK1, and control is achieved by setting the temperature threshold of temperature controller WK1. When the pressure reducing valve temperature is below 10℃, temperature sensor TE1 transmits a signal to temperature controller WK1, outputting a 24V voltage (which can be considered a positive feedback signal, continuously released until the temperature drops below 40℃). Relay K is energized, and after contact K of relay K closes, contactor KM is energized, and the first contact KM1 closes, energizing heater EH to start heating the pressure reducing valve. When the outlet temperature of the pressure reducing valve reaches 40℃, temperature controller WK1 no longer outputs 24V voltage (which can be considered a negative feedback signal), relay K is de-energized, main contactor KM is de-energized, contact KM1 opens, and heater EH is de-energized and stops, thus achieving automatic heating.

[0037] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A temperature control circuit for a pressure reducing valve heater, characterized in that, It includes a temperature control module, a switch module, and a sensing module. The sensing module is adapted to identify the outlet temperature of the pressure reducing valve and release a positive feedback signal or a negative feedback signal according to the identified temperature. The switch module is adapted to control the heater to connect or disconnect the power supply. The temperature control module is adapted to identify the positive feedback signal and the negative feedback signal to drive the switch module to connect and disconnect respectively.

2. The temperature control circuit for the pressure reducing valve heater as described in claim 1, characterized in that, The sensing module includes a control circuit with a settable temperature threshold. The sensing module is adapted to continuously release the positive feedback signal throughout the entire process from when the temperature of the pressure reducing valve is below the lower limit of the temperature threshold until it is below the upper limit of the temperature threshold, and is adapted to release the negative feedback signal when the temperature is above the upper limit of the temperature threshold.

3. The temperature control circuit for the pressure reducing valve heater as described in claim 2, characterized in that, The switching module includes a relay and a contactor connected in series. The contactor has a first contact connected in series. The first contact and the relay are connected in parallel. The first contact is used to control the opening and closing of the heater. The temperature control module is adapted to drive the relay to close and open to open or close the first contact.

4. The temperature control circuit for the pressure reducing valve heater as described in claim 3, characterized in that, A first switch is connected in parallel with the first contact, and when the first switch is closed, the first contact is short-circuited.

5. The temperature control circuit for the pressure reducing valve heater as described in claim 3, characterized in that, A second switch and a third switch are connected in series on both sides of the first contact, and the first contact, the second switch, the third switch and the relay are connected in parallel.

6. The temperature control circuit for the pressure reducing valve heater as described in claim 4, characterized in that, The relay is connected in series with a fourth switch, which is used to manually control the on / off state of the relay.

7. The temperature control circuit for the pressure reducing valve heater as described in any one of claims 3-6, characterized in that, The temperature control module is configured as a temperature controller. The temperature controller releases the positive feedback signal to keep the relay continuously powered on and turned on, and the temperature controller releases the negative feedback signal to turn the relay off and turn it off.

8. The temperature control circuit for the pressure reducing valve heater as described in claim 1, characterized in that, It also includes a power indicator light that shows when the power is on.

9. The temperature control circuit for the pressure reducing valve heater as described in claim 3, characterized in that, It also includes a running indicator light and a second contact connected in series. The second contact closes when the contactor is energized, and the running indicator light and the second contact connected in series are connected to the power supply.

10. The temperature control circuit for the pressure reducing valve heater as described in claim 2, characterized in that, The sensing module is configured as a temperature sensor, which is used to set a temperature threshold and perform temperature identification.

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