CN108593127B - Thermocouple point distribution tool and point distribution method - Google Patents

Abstract

The invention relates to a thermocouple point distribution tool which comprises a winding main rod and a handle, wherein the rear end of the winding main rod is inserted into the handle, the front end of the winding main rod is provided with an axially extending blind hole, the front end opening part of the blind hole is provided with a strip-shaped rotary notch which is parallel to the axis of the main rod and communicated with the blind hole, the width W of the rotary notch is larger than the diameter of a thermocouple conducting wire, and the difference between the depth L1 of the blind hole and the length L2 of the rotary notch is larger than the length of a thermocouple front end temperature measuring point. Meanwhile, the invention also provides a thermocouple point distribution method by using the thermocouple point distribution tool. The tool can effectively isolate and protect the temperature measuring points of the laid thermocouples, and avoid redundant temperature interference caused by contact between the temperature measuring points and unnecessary non-measuring points, thereby affecting the accuracy of temperature acquisition data; and the temperature measuring point is formed quickly and conveniently, so that the work efficiency of point distribution is greatly improved.

Description

Thermocouple point layout tool and point layout method

technical field

The invention relates to the technical field of thermocouple point distribution, in particular to a thermocouple point distribution tool and a method for using the thermocouple point distribution tool to carry out point distribution.

Background technique

Before the car conducts the thermal environment wind tunnel test, it is necessary to arrange thermocouples (thermocouples are a kind of temperature sensor) in the engine compartment and passenger cabin of the car, and collect the surface temperature of the car and the inside of the pipeline through the temperature measuring points of the thermocouples. Fluid temperature and localized area air temperature. The existing point layout method generally directly arranges the thermocouple contact point at the measured position without corresponding protection and isolation measures. The objective disadvantages of this method are: (1), it affects the accuracy of temperature collection data; (2), it is inconvenient to use, and the efficiency of point layout is low.

Usually, there are two situations that affect the accuracy of temperature collection data during the test. The first case: the driving wind speed will be simulated during the environmental simulation test of the automobile wind tunnel. The thermocouples are arranged in the flow field. The airflow will shake the thermocouples, and the airflow will disturb the thermocouples. Temperature interferes, thus affecting the accuracy of temperature acquisition. The second case: when collecting the temperature of the liquid inside the pipeline, the thermocouple is arranged inside the pipeline to contact the liquid for temperature collection. During the test, the vehicle starts to simulate road driving, and the liquid in the pipeline of the whole system circulates, and the flow causes the thermocouple in the pipeline to displace. The thermocouple temperature measuring point is in contact with the tube wall, resulting in temperature transfer and thus affecting the accuracy of temperature collection. The reason is mainly that the temperature measuring point of the thermocouple is exposed, causing contact with a non-measuring point, thereby affecting the accuracy of temperature collection data.

Contents of the invention

Based on this, the present invention aims to provide a point layout tool dedicated to thermocouples, through which the temperature measurement points of the thermocouples after layout can be effectively isolated and protected, avoiding temperature measurement points and unnecessary non-measurement points Contact produces redundant temperature interference, which affects the accuracy of temperature collection data; and the temperature measurement point is quick and convenient to form, which greatly improves the work efficiency of point layout.

For this reason, the technical solution adopted in the present invention is: a thermocouple point distribution tool, including a winding main rod and a handle, the rear end of the winding main rod is inserted into the handle, and the front end of the winding main rod is provided with an axial An extended blind hole, the front port of the blind hole is provided with a long strip-shaped rotating slot parallel to the axis of the main rod and communicating with the blind hole, the width W of the rotating slot is greater than the diameter of the thermocouple conductive wire, The difference between the depth L1 of the blind hole and the length L2 of the rotating slot is greater than the length of the temperature measuring point at the front end of the thermocouple.

As a preference of the above solution, the winding main rod is made of stainless steel, the main body is a cylindrical rod, the rear end of the cylindrical rod has a square anti-rotation section in cross section, the handle is a wooden handle, and the wooden handle is set There are anti-rotation holes matching the anti-rotation section, and the anti-rotation section and the anti-rotation hole are interference fit. The wooden handle is used to improve the comfort of holding; the wooden handle and the winding main rod are connected by an anti-rotation structure, which can effectively prevent the relative rotation of the wooden handle and the winding main rod during use.

Further, a limit step or a limit scratch is set on the winding main rod, and the limit step or limit scratch is located 2-3 mm behind the blind hole. Add a limit step or a limit scratch, and the thermocouple conductive wire is wound from front to back along the winding main rod to the limit step or limit scratch, which makes the operation more convenient and accurate.

Furthermore, the width W of the rotary slot is 1.5 mm, the length L2 is 5 mm, and the difference between the depth L1 of the blind hole and the length L2 of the rotary slot is 7-10 mm.

Simultaneously, the present invention also provides a thermocouple distribution method using the above-mentioned thermocouple distribution tool, comprising the following steps:

In the first step, insert the temperature measuring point at the front end of the thermocouple into the blind hole of the coiled main rod until the temperature measuring point at the front end of the thermocouple contacts the bottom of the blind hole. At this time, the temperature measuring point at the front end of the thermocouple is completely placed in the blind hole;

The second step is to bend the conductive wire of the thermocouple close to the temperature measuring point at the front end to the outside of the winding main rod through the rotating slot, so that the thermocouple conductive wire and the winding main rod are bent at 90° and then connected to the outside of the winding main rod. The diameter is tangent, press the bending tangent position of the thermocouple conduction wire with one hand, keep it close to the outer wall of the winding main rod, hold the handle with the other hand and turn it several times, so that the thermocouple conduction wire goes from front to back along the winding main rod Wound into a helical section until the length of the helical section is greater than the length of the temperature measuring point at the front end of the thermocouple extending into the blind hole;

The third step is to push the helical section of the thermocouple from the back to the front, so that the thermocouple withdraws from the thermocouple pointing tool.

As a preference of the above solution, a limit step or a limit scratch is set on the winding main rod, and the limit step or limit scratch is located at a position 2-3 mm behind the blind hole, and the thermocouple conduction wire is wound along the The main rod is wound from front to back to the limit step or limit scratch.

Beneficial effects of the present invention: the thermocouple front-end temperature measuring point after the coil is formed is surrounded by the thermocouple conductive wire and is always in the center position, avoiding unnecessary temperature interference caused by the contact between the front-end temperature measuring point and the non-measurement point during data collection, and the front-end temperature measurement The points play an effective isolation and protection role, thereby ensuring the accuracy and reliability of temperature collection; and the molding is quick and convenient, which greatly improves the efficiency of point layout.

Description of drawings

Fig. 1 is a perspective view of a thermocouple spotting tool of the present invention.

Fig. 2 is a front view of the thermocouple layout tool of the present invention.

FIG. 3 is an enlarged view of the winding mandrel of FIG. 1 .

Figure 4 is a partial schematic view of a thermocouple after roll formation.

Detailed ways

Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

As shown in Fig. 1-Fig. 3, a thermocouple spotting tool is mainly composed of two parts: a winding main rod 1 and a handle 2.

The rear end of the winding main rod 1 is inserted into the handle 2, and the handle 2 is provided to facilitate the operator to hold it. A blind hole 1a extending axially is opened at the front end of the winding main rod 1, and a long strip-shaped rotating slot 1b parallel to the axis of the main rod 1 and communicating with the blind hole 1a is opened at the front end of the blind hole 1a. The width W of the rotating slot 1b is greater than the diameter of the thermocouple conducting wire to ensure that the thermocouple conducting wire can pass through the rotating slot 1b. The difference between the depth L1 of the blind hole 1a and the length L2 of the rotating slot 1b is greater than the length of the temperature measuring point at the front end of the thermocouple, so as to ensure that the temperature measuring point at the front end can be completely placed in the blind hole 1a.

Preferably, the winding main rod 1 is made of stainless steel, the main body is a cylindrical rod, and the rear end of the cylindrical rod has an anti-rotation section 1c with a square cross section. The handle 2 is a wooden handle, and an anti-rotation hole 2a matching the anti-rotation section 1c is provided on the wooden handle, and the anti-rotation section 1c is interference fit with the anti-rotation hole 2a.

In addition, a limit step or a limit scratch (not shown in the figure) is set on the main winding rod 1, and the limit step or limit scratch is located at the position 2-3mm behind the blind hole 1a, and the thermocouple conduction wire is It is advisable that the helical section wound from front to back around the main rod 1 should exceed the temperature measuring point at the front end of the thermocouple by about 3 turns, which is convenient for accurately controlling the length of the helical section wound by the conductive wire of the thermocouple and ensuring the temperature measurement point at the front end of the thermocouple. 3. The best protection state, and at the same time, it can avoid the long spiral section and make it difficult to arrange, and it is more convenient to operate.

Preferably, the width W of the rotary slot 1b is 1.5mm, the length L2 is 5mm, and the difference between the depth L1 of the blind hole 1a and the length L2 of the rotary slot 1b is preferably 7-10mm, but it is not limited thereto.

The thermocouple point layout method carried out by using the above thermocouple point layout tool includes the following steps:

The first step is to insert the temperature measuring point at the front end of the thermocouple into the blind hole 1a of the coiled main rod 1 until the temperature measuring point at the front end of the thermocouple contacts the bottom of the blind hole 1a. At this time, the temperature measuring point at the front end of the thermocouple is completely placed in the blind hole within 1a.

The second step is to bend the conductive wire of the thermocouple close to the temperature measuring point at the front end to the outside of the winding main rod 1 through the rotating slot 1b, so that the thermocouple conductive wire and the winding main rod 1 are bent at 90° and then connected with the winding The outer diameter of the main rod 1 is tangent, and one hand presses the bending tangent position of the thermocouple conduction wire to keep it close to the outer wall of the winding main rod 1, and the other hand holds the handle 2 and rotates it several times so that the thermocouple conduction wire is wound along the The main rod 1 is wound into a helical section from front to back until the length of the helical section is greater than the length of the temperature measuring point at the front end of the thermocouple extending into the blind hole 1a.

The third step is to push the helical section of the thermocouple from the back to the front, so that the thermocouple withdraws from the thermocouple pointing tool.

Preferably, a limit step or a limit scratch is set on the winding main rod 1, and the limit step or limit scratch is located at the position 2-3mm behind the blind hole 1a, and the thermocouple conduction line is passed along the winding main rod 1. Wrap forward and backward until the limit step or limit scratches.

As shown in Figure 4, the temperature measuring point A of the front end of the thermocouple after being rolled and formed is surrounded by the conductive wire B of the thermocouple and is always in the center, which effectively isolates and protects the temperature measuring point A of the front end.

Claims (4)

1. A thermocouple spotting tool, characterized in that it includes a winding main rod (1) and a handle (2), the rear end of the winding main rod (1) is inserted into the handle (2), and the winding main rod The front end of (1) is provided with an axially extending blind hole (1a), and the front end of the blind hole (1a) is provided with a long strip that is parallel to the axis of the main rod (1) and communicates with the blind hole (1a). The rotation slot (1b), the width W of the rotation slot (1b) is greater than the diameter of the thermocouple conductive wire, the difference between the depth L1 of the blind hole (1a) and the length L2 of the rotation slot (1b) is greater than that of the thermocouple The length of the front temperature measuring point; The winding main rod (1) is made of stainless steel, the main body is a cylindrical rod, and the rear end of the cylindrical rod has an anti-rotation section (1c) with a square cross-section, and the handle (2) is a wooden handle. An anti-rotation hole (2a) matching the anti-rotation section (1c) is provided on the handle, and the anti-rotation section (1c) is interference fit with the anti-rotation hole (2a); The width W of the rotary slot (1b) is 1.5mm, the length L2 is 5mm, and the difference between the depth L1 of the blind hole (1a) and the length L2 of the rotary slot (1b) is 7-10mm. 2. The thermocouple spotting tool according to claim 1, characterized in that: the winding main rod (1) is provided with a limit step or a limit scratch, and the limit step or limit scratch is located in the blind hole ( 1a) 2-3mm behind. 3. a thermocouple distribution method utilizing the thermocouple distribution tool described in claim 1 or 2, is characterized in that, comprises the following steps: The first step is to insert the temperature measuring point at the front end of the thermocouple into the blind hole (1a) of the coiled main rod (1) until the temperature measuring point at the front end of the thermocouple contacts the bottom of the blind hole (1a). At this time, the temperature measuring point at the front end of the thermocouple The point is completely placed inside the blind hole (1a); The second step is to bend the conductive wire of the thermocouple close to the temperature measuring point at the front end to the outside of the winding main rod (1) through the rotating slot (1b), so that the thermocouple conductive wire and the winding main rod (1) are at 90° After bending, it is tangent to the outer diameter of the winding main rod (1), press the bending tangent position of the thermocouple conduction wire with one hand, and keep it attached to the outer wall of the winding main rod (1), and hold the handle (2) with the other hand Rotate several times, so that the thermocouple conduction wire is wound from front to back along the winding main rod (1) to form a helical section until the length of the helical section is greater than the length of the temperature measuring point at the front end of the thermocouple extending into the blind hole (1a); The third step is to push the helical section of the thermocouple from the back to the front, so that the thermocouple withdraws from the thermocouple pointing tool. 4. The thermocouple arrangement method according to claim 3, characterized in that: the winding main rod (1) is provided with a limit step or a limit scratch, and the limit step or limit scratch is located in the blind hole ( 1a) At the position 2-3mm behind, the thermocouple conduction wire is wound from front to back along the winding main rod (1) to the limit step or limit scratch.