Temperature element testing device

Abstract

The invention discloses a temperature element test device, comprising: a heating cavity, one side of which is provided with an insertion port, the insertion port is communicated with the inner cavity of the heating cavity, and the insertion port is used for inserting a temperature element into the heating cavity; the heating assembly is arranged on the inner wall of the heating cavity; the temperature control assembly is electrically connected with the heating assembly and used for controlling the temperature of the heating assembly; and the mobile power supply assembly is electrically connected with the heating assembly and the temperature control assembly. According to the invention, the influence of a narrow field environment on a temperature element test is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature testing, in particular to a temperature element testing device. Background Art

[0002] To effectively prevent power generation accidents, thermal protection interlock tests should employ simulation tests at the on-site signal source or physical methods to perform actual transmission. However, testing by opening or shorting input terminals within the control cabinet is prohibited. Due to the high level of integration of power plant equipment and the complex on-site environment, actual transmission testing of temperature signals is often impossible due to the following reasons.

[0003] (1) The temperature measuring elements of various equipment in thermal power plants are often installed in very narrow spaces or on certain high-altitude pipelines. The existing temperature element (such as thermal resistors or thermocouples) test devices on the market need to be connected to an AC 220V power supply. When entering a confined space such as a boiler furnace, the safety operation regulations stipulate that the working voltage level must not exceed 36V. The existing test devices cannot be brought into the confined space for testing. When working on high-altitude pipelines, it is also extremely inconvenient to connect the power supply of the test device, and the weight of the power cable also increases the risk of high-altitude operations.

[0004] (2) Since the lead length of the temperature element is not allowed to be too long during installation, the movable range of the temperature element is very limited. The temperature sensing point of the temperature element cannot be heated by twisting the direction to insert it into the test device. In addition, due to the large amplitude of the movement, the temperature element is at risk of breaking and being damaged.

[0005] (3) The temperature element itself cannot actually heat up. During unit maintenance, thermal temperature protection tests are often carried out by removing the temperature element and sending it to the temperature test room for calibration to verify the accuracy of the temperature element. However, by removing the temperature element and sending it to the test room for calibration, there are omissions in the actual transmission test of the temperature protection, and the temperature protection of the equipment cannot be accurately and effectively guaranteed. In addition, when the unit is shut down, problems in the intermediate links cannot be found through testing, and defects and hidden dangers cannot be dealt with in a timely manner. If the measuring point fails after the unit is started, the difficulty of maintenance work is increased, and it may even be impossible to deal with it due to the installation of the measuring point. The temperature protection is in a released state for a long time, and the safe operation of the equipment cannot be guaranteed. Summary of the Invention

[0006] The main purpose of the present invention is to provide a temperature element test device to reduce the influence of a narrow field environment on the temperature element test.

[0007] To achieve the above object, the present invention provides a temperature element testing device, comprising:

[0008] The heating cavity has a plug-in port on one side thereof, the plug-in port is communicated with the inner cavity of the heating cavity, and the plug-in port is used for inserting the temperature element into the heating cavity;

[0009] A heating component is arranged on the inner wall of the heating cavity;

[0010] A temperature control component, electrically connected to the heating component, for controlling the temperature of the heating component;

[0011] The mobile power supply component is electrically connected to the heating component and the temperature control component.

[0012] Furthermore, the temperature element testing device also includes a heat-insulating shell, which is sleeved on the outer wall of the heating cavity.

[0013] Furthermore, the heat-insulating housing comprises:

[0014] Asbestos insulation layer, sleeved on the outer wall of the heating cavity;

[0015] Heat-resistant plastic shell, sleeved on asbestos insulation layer.

[0016] Furthermore, the inner wall of the heating cavity includes a bottom wall opposite to the plug interface and a side wall connected to the bottom wall. The heating component is arranged on the side wall. A temperature element bracket is arranged between the plug interface and the bottom wall. The temperature element bracket is formed with a receiving hole. The plug interface is for the temperature element to be inserted into the receiving hole.

[0017] Furthermore, a plurality of receiving holes are formed, and the hole diameters of the plurality of receiving holes are different from each other.

[0018] Furthermore, the temperature element bracket includes a first bracket and a second bracket located between the plug interface and the bottom wall, the first bracket and the second bracket are respectively connected to the side wall, the first bracket is provided with a plurality of first through holes, the second bracket is provided with a plurality of second through holes corresponding to the plurality of first through holes, and a first through hole and a corresponding second through hole are coaxially arranged to form a receiving hole;

[0019] The apertures of the plurality of first through holes are different from each other, and the apertures of the plurality of second through holes are different from each other.

[0020] Further, the apertures of the coaxially arranged first through hole and the second through hole are the same as each other.

[0021] Furthermore, the temperature element testing device also includes a first mounting seat, the temperature control component is mounted on the first mounting seat, and the heating cavity and the mobile power supply component are respectively connected to opposite sides of the first mounting seat.

[0022] Furthermore, the temperature control component is electrically connected to the heating component through a solid-state relay.

[0023] Furthermore, the temperature element testing device also includes a holding portion, one end of the holding portion is connected to the side of the first mounting seat facing away from the heating cavity, and the other end of the holding portion is connected to the mobile power supply assembly, and the holding portion is made of insulation material.

[0024] Furthermore, the mobile power supply assembly includes:

[0025] a second mounting base connected to the other end of the grip portion;

[0026] The rechargeable battery is installed on the side of the second mounting base facing away from the gripping portion.

[0027] The beneficial effects of the technical solution of the present invention are:

[0028] Since it adopts low-voltage control and lithium battery power supply, it complies with the working power supply level regulations for safe operation in confined spaces, and can heat the temperature elements in the confined space to complete the actual transmission test. In addition, no external power supply is required, and the battery life can be increased by increasing the number of lithium batteries. It saves the work of pulling the power cord when working at a work location far away from the maintenance power supply, and simplifies the work process. A universal PID temperature controller is used for automatic temperature adjustment, which is convenient and can be used proficiently to complete the transmission test after quick learning, saving the training cost of on-site personnel. In addition, the temperature element test device of the present invention is small in size and easy to carry. It can enter the interior of equipment with narrow space, such as boiler furnace, turbine cylinder, etc. for testing, and it is lightweight and easy to carry to harsh environments such as high-altitude pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a temperature element testing device according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of a circuit of a temperature element testing device according to an embodiment of the present invention.

[0031] Description of Figure Numbers:

[0032] Heating chamber 100; heating component 200; temperature control component 300; mobile power supply component 400; second mounting base 410; rechargeable battery 420; asbestos insulation layer 510; heat-resistant plastic shell 520; first bracket 610; second bracket 620; first mounting base 700; grip portion 800; solid-state relay 900.

[0033] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings to clearly and completely describe the solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications in the following embodiments (such as up, down, left, right, front, back, top, bottom, side, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0037] In addition, the descriptions involving "first", "second", etc. in the following embodiments are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0038] In view of the technical defects in the related art, this embodiment provides a temperature element test device, such as Figure 1 As shown, the temperature element testing device of this embodiment includes a heating chamber 100 , a heating assembly 200 , a temperature control assembly 300 and a mobile power supply assembly 400 .

[0039] For example, the heating chamber 100 can be cylindrical, with a plug-in port on one side, which is connected to the inner cavity of the heating chamber 100, so that the temperature element to be tested can be inserted into the heating chamber 100 through this plug-in port. Optionally, the heating chamber 100 can be made of stainless steel, but other heat-resistant materials such as ceramic, quartz, titanium alloy, aluminum alloy, etc. can also be used according to actual needs, but are not limited to these. The heating component 200 is arranged on the inner wall of the heating chamber 100, and the temperature control component 300 is arranged on the outside of the heating chamber 100 and is electrically connected to the heating component 200 to control the temperature of the heating component 200.

[0040] Preferably, for ease of maintenance, the temperature control assembly 300 of this embodiment utilizes a commercially available 48mm x 48mm, 36V high-precision PID temperature controller. This type of temperature controller is technologically mature and inexpensive. By receiving a PT100 thermal resistor signal, it displays the internal temperature of the heating chamber 100 in real time and accepts manual input of a set temperature value by the tester. The power to the heating assembly 200 is turned on and off by self-tuning the PID output switch contacts, automatically controlling the ambient temperature to approach the set temperature value.

[0041] The mobile power supply assembly 400 is electrically connected to the heating assembly 200 and the temperature control assembly 300 to provide electrical energy to the heating assembly 200 and the temperature control assembly 300 .

[0042] Preferably, the temperature element test device of this embodiment further includes a heat-insulating outer shell, which is sleeved on the outer wall of the heating chamber 100 to prevent the operator from direct contact with the heating chamber 100, thereby avoiding burns, and also provides heat insulation for the heating chamber. Specifically, the heat-insulating outer shell includes an asbestos insulation layer 510 and a heat-resistant plastic shell 520. The asbestos insulation layer 510 is sleeved on the outer wall of the heating chamber 100, and the heat-resistant plastic shell 520 is sleeved on the asbestos insulation layer 510. The provision of the asbestos insulation layer 510 and the heat-resistant plastic shell 520 can effectively reduce the heat transfer from the heating chamber 100 to the outside.

[0043] By using the temperature element test device of this embodiment, when working on high-altitude pipelines, there is no need to specially arrange power cables for the heating component 200, which facilitates high-altitude operations. In addition, the temperature element test device itself is light in weight, thereby reducing the risks of high-altitude operations.

[0044] Continue to refer to Figure 1 As shown, in this embodiment, the inner wall of the heating cavity 100 includes a bottom wall opposite to the plug-in port and a side wall connected to the bottom wall, and the heating assembly 200 is arranged on the side wall. A temperature element bracket is provided between the plug-in port and the bottom wall, and the temperature element bracket is formed with a receiving hole, and the plug-in port is for the temperature element to be inserted into the receiving hole. When the temperature element is inserted into the heating cavity 100, the temperature element is supported by the temperature element bracket, so that the temperature element does not come into direct contact with the heating assembly 200. Instead, the temperature is gradually increased by heat conduction or radiation heat from the air, so that the temperature element can be heated evenly, thereby avoiding the problem of a local area of ​​the temperature element being in direct contact with the heating assembly 200 and rapidly increasing in temperature.

[0045] Optionally, in order to adapt to temperature elements of various sizes, a plurality of receiving holes are formed, and the apertures of the plurality of receiving holes are different from each other. Figure 1As shown, the temperature element bracket includes a first bracket 610 and a second bracket 620 located between the plug interface and the bottom wall, and the first bracket 610 and the second bracket 620 are respectively connected to the side wall. The first bracket 610 is provided with a plurality of first through holes, and the second bracket 620 is provided with a plurality of second through holes corresponding to the plurality of first through holes. A first through hole and a corresponding second through hole are coaxially arranged to form a receiving hole. The apertures of the plurality of first through holes are different from each other, and the apertures of the plurality of second through holes are different from each other. Preferably, the apertures of the coaxially arranged first through holes and the second through holes are the same as each other. Optionally, the apertures of the first through holes and the second through holes can be set to 6 mm, 8 mm, 10 mm or 12 mm.

[0046] Continue to refer to Figure 1 As shown, in this embodiment, the temperature element test device also includes a first mounting seat 700. The temperature control component 300 is installed on the first mounting seat 700, and the heating cavity 100 and the mobile power supply component 400 are respectively connected to the opposite sides of the first mounting seat 700. Among them, the temperature element test device also includes a gripping portion 800, one end of the gripping portion 800 is connected to the side of the first mounting seat 700 facing away from the heating cavity 100, and the other end of the gripping portion 800 is connected to the mobile power supply component 400, and the gripping portion 800 is made of a heat-insulating material. Since the gripping portion 800 is provided, the portability of the temperature element test device of this embodiment is improved, and the gripping portion 800 is made of a heat-insulating material, so the staff will not be burned by the heating cavity 100 during use.

[0047] Continue to refer to Figure 1 As shown, in this embodiment, the mobile power supply assembly 400 includes a second mounting base 410 and a rechargeable battery 420. The second mounting base 410 is connected to the other end of the grip 800, and the rechargeable battery 420 is installed on the side of the second mounting base 410 facing away from the grip 800. Optionally, the rechargeable battery 420 can be a 36V removable rechargeable lithium battery, which can meet the requirements of field work and comply with the operating voltage level required for safe operation.

[0048] Further, combined with Figure 2 As shown, in order to reduce the current at the control output contacts of the temperature control component 300, reduce the probability of failure of the temperature control component 300 due to excessive current at the control output contacts, isolate the power supply portion of the heating component 200 from the temperature control signal portion, and prevent backflow current from damaging the temperature control component 300 due to a short circuit in the heating component 200, a solid-state relay 900 can be added to the connection circuit between the temperature control component 300 and the heating component 200. The operation of the heating component 200 is controlled by connecting or disconnecting the output contacts of the solid-state relay.

[0049] The following is the operating procedure of the temperature element testing device of this embodiment.

[0050] (1) During the on-site test, fully charge the rechargeable battery 420 in advance and carry the temperature element test device to the temperature element. Remove the temperature element from the equipment, restore the original wiring of the temperature element, and insert the temperature element into the corresponding receiving hole of the temperature element bracket according to the diameter of the temperature element. The tester holds the temperature element test device steady.

[0051] (2) After the temperature element is installed, press the power switch button. According to the temperature protection setting of the temperature element test device, the required heating temperature value is input into the temperature control component 300. The contacts of the temperature control component 300 are closed, and the power circuit of the heating component 200 is connected. The heating component 200 starts to work, and the temperature in the heating cavity 100 rises.

[0052] (3) The temperature element in the heating chamber 100 is exposed to heat radiation and begins to heat up. The temperature element outputs a resistance signal that is transmitted to the DCS system via a signal cable. By comparing the temperature value displayed on the DCS system with the temperature value displayed on the temperature control component 300, it can be determined whether the temperature element is damaged or whether there is a fault in the intermediate link. If the temperature values ​​on both sides are consistent, and the temperature of the heating chamber 100 reaches the temperature protection set value of the temperature element test device, the DCS logic judgment output is activated, the protection is activated, and the full process of the on-site transmission test of the temperature measurement point is completed.

[0053] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. Any equivalent structural transformation made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields, is included in the scope of protection of the present invention.

Claims

1. A temperature element test device, characterized in that: include: The heating cavity has a plug-in port on one side thereof, the plug-in port being in communication with the inner cavity of the heating cavity and being used for inserting a temperature element into the heating cavity; A heating component is arranged on the inner wall of the heating cavity; a temperature control component, electrically connected to the heating component, and configured to control the temperature of the heating component; The mobile power supply component is electrically connected to the heating component and the temperature control component.

2. The temperature element testing device according to claim 1, characterized in that: Also includes: an asbestos heat insulation layer, sleeved on the outer wall of the heating cavity; The heat-resistant plastic shell is sleeved on the asbestos insulation layer.

3. The temperature element testing device according to claim 1, characterized in that: The temperature control component is electrically connected to the heating component through a solid-state relay.

4. The temperature element testing device according to claim 1, characterized in that: The inner wall of the heating cavity includes a bottom wall opposite to the plug-in port and a side wall connected to the bottom wall. The heating assembly is arranged on the side wall. A temperature element bracket is arranged between the plug-in port and the bottom wall. The temperature element bracket is formed with a receiving hole. The plug-in port is for the temperature element to be inserted into the receiving hole.

5. The temperature element testing device according to claim 4, characterized in that: A plurality of the receiving holes are formed, and the hole diameters of the plurality of receiving holes are different from each other.

6. The temperature element testing device according to claim 5, characterized in that: The temperature element bracket includes a first bracket and a second bracket located between the plug port and the bottom wall, the first bracket and the second bracket are respectively connected to the side wall, the first bracket is provided with a plurality of first through holes, the second bracket is provided with a plurality of second through holes corresponding to the plurality of first through holes, and a first through hole and a corresponding second through hole are coaxially arranged to form a receiving hole; The apertures of the plurality of first through holes are different from each other, and the apertures of the plurality of second through holes are different from each other.

7. The temperature element testing device according to claim 6, characterized in that: The first through hole and the second through hole, which are coaxially arranged, have the same hole diameters as each other.

8. The temperature element testing device according to claim 1, characterized in that: It also includes a first mounting base, the temperature control component is installed on the first mounting base, and the heating cavity and the mobile power supply component are respectively connected to opposite sides of the first mounting base.

9. The temperature element testing device according to claim 8, characterized in that: It also includes a gripping portion, one end of which is connected to the side of the first mounting seat facing away from the heating cavity, and the other end of the gripping portion is connected to the mobile power supply assembly, and the gripping portion is made of heat-insulating material.

10. The temperature element testing device according to claim 9, characterized in that: The mobile power supply assembly includes: a second mounting base connected to the other end of the grip portion; The rechargeable battery is installed on a side of the second mounting seat facing away from the gripping portion.

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