Device for measuring temperature of fluid outlet in heating round pipe under high-pressure condition

Abstract

The utility model discloses a device for measuring the temperature of a fluid outlet in a heating round pipe under a high pressure condition, which comprises a fluid heating pipe, a clamping sleeve nut, a rear clamping sleeve, a front clamping sleeve, a front baffle gasket, a metal tennis ball, a rear baffle ring, a body, a sheathed thermocouple and a fluid outlet pipe, a sheathed thermocouple is arranged at the top of the body, the metal tennis ball is located on the side, close to the fluid heating pipe, in the body, and the measuring head of the sheathed thermocouple is arranged near the central axis position in the circular pipe of the body. The device can effectively eliminate the radial temperature gradient of the fluid at the outlet in the fluid heating pipe, can measure the average temperature of the fluid in the fluid heating pipe, is direct and simple in measurement mode, and can measure the average temperature of the fluid in the fluid heating pipe through the combined action of the front baffle gasket, the metal tennis ball and the rear baffle ring. The radial temperature gradient of the fluid at the outlet of the heating circular tube can be effectively eliminated, so that the average temperature of the fluid outlet in the heating circular tube can be accurately measured.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measurement of fluid in a pipe, in particular to a device for measuring the outlet temperature of fluid in a heated circular pipe under high pressure conditions. Background Art

[0002] In a convection heat transfer experiment involving a fluid in a heating tube, in order to accurately obtain the average convection heat transfer coefficient of the fluid in the tube, it is first necessary to accurately measure the average temperature of the fluid in the tube. Typically, the average temperature of the fluid in the tube is obtained by calculating the arithmetic mean of the average inlet and outlet temperatures of the fluid in the heating tube.

[0003] In order to achieve the heating of the fluid in the tube, it is generally heated by convective heat transfer between the tube wall and the fluid in the tube. This heating method will cause a large temperature difference between the fluid temperature near the tube wall and the fluid temperature in the center of the tube, resulting in a radial gradient of fluid temperature at the same cross-section in the tube. From heat transfer theory, it is known that this temperature gradient is mainly distributed in the thermal boundary layer.

[0004] Since the fluid at the inlet of the heating tube has not been heated and there is no temperature gradient, the average temperature of the fluid inlet can be directly measured by a thermocouple; however, when using a thermocouple to measure the average temperature of the fluid outlet, due to the presence of a radial temperature gradient in the heated fluid, the temperatures measured when the thermocouple measuring head is at different radial positions of the outlet cross-section are different, which will cause a large error in the calculation of the average temperature of the fluid. Therefore, it is necessary to design a measuring device that can accurately measure the average temperature of the fluid outlet in the heated circular tube to accurately calculate the average temperature of the fluid in the tube. Utility Model Content

[0005] The purpose of the present invention is to provide a device for measuring the outlet temperature of a fluid in a heated circular tube under high pressure conditions in order to solve the above-mentioned problem.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] The utility model discloses a device for measuring the outlet temperature of the fluid in a heated circular tube under high-pressure conditions, comprising a fluid heating tube, a ferrule nut, a rear ferrule, a front ferrule, a front baffle washer, a metal tennis ball, a rear baffle ring, a main body, an armored thermocouple, and a fluid outlet tube. The main body is a three-way structure, a fluid heating tube is arranged on one side of the main body, a fluid outlet tube is arranged on the other side of the main body, an armored thermocouple is arranged on the top of the main body, the metal tennis ball is located on a side of the main body close to the fluid heating tube, and the end measuring head of the armored thermocouple is arranged at the center axis position inside the circular tube of the main body.

[0008] As an optimal technical solution of the utility model for a device for measuring the outlet temperature of the fluid in a heated circular tube under high-pressure conditions, the ferrule nut on one side is sequentially sleeved with the rear ferrule, the front ferrule, and the front stop washer and is threadedly connected to the main body, so that it fixes the fluid heating tube to one side of the main body; the ferrule nut on the other side is sequentially sleeved with the rear ferrule and the front ferrule and is threadedly connected to the main body, so that it fixes the fluid outlet tube to the other side of the main body; the ferrule nut on the top side is sequentially sleeved with the rear ferrule and the front ferrule and is threadedly connected to the main body, so that it fixes the armored thermocouple to a fixed side of the main body.

[0009] As an optimal technical solution of the utility model for measuring the outlet temperature of the fluid in a heated circular tube under high-pressure conditions, the end of the fluid heating tube is in contact with the front baffle washer, and the baffle ring is integrally processed with the main body. The baffle ring and the front baffle washer jointly limit the position of the metal tennis ball to ensure that the metal tennis ball will not slip out with the flow of the fluid.

[0010] As an optimal technical solution of the present invention for measuring the outlet temperature of the fluid in a heated circular tube under high-pressure conditions, the metal tennis ball is made of copper with high thermal conductivity and a mesh size of 100-200, so that the heated fluid at the outlet of the fluid heating tube can be evenly mixed through the metal tennis ball.

[0011] As an optimal technical solution for the outlet temperature measuring device of the fluid in a heated circular tube under high-pressure conditions of the utility model, the convex shape of the front baffle gasket and the rear baffle ring in the main body is a 30° inclined surface that gradually convexes along the direction of fluid flow, so that the fluid with higher temperature near the main tube wall is mixed with the fluid with lower temperature in the center of the tube, and a small additional flow resistance is generated.

[0012] As an optimal technical solution of the utility model for measuring the outlet temperature of the fluid in a heated circular tube under high-pressure conditions, the fluid heating tube, ferrule nut, rear ferrule, front ferrule, front baffle washer, rear baffle ring, main body, and fluid outlet pipe are all made of stainless steel.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0014] The utility model can effectively eliminate the radial temperature gradient of the fluid at the outlet of the heating tube, and can measure the average temperature of the fluid. The measurement method is direct and simple. The device can effectively eliminate the radial temperature gradient of the fluid at the outlet of the heating tube through the joint action of the front baffle washer, the metal tennis ball and the rear baffle ring, thereby accurately measuring the average outlet temperature of the fluid in the heating tube under high pressure conditions. In addition, the device adopts a T-shaped three-way structure, which is easy to install and saves space, greatly improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the split structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 3 It is a working principle diagram of the utility model;

[0019] In the figure: 1. Fluid heating tube; 2. Ferrule nut; 3. Rear ferrule; 4. Rear ferrule; 5. Front washer; 6. Metal tennis ball; 7. Metal tennis ball; 8. Main body; 9. Armored thermocouple; 10. Fluid outlet pipe. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0021] In the drawings, the same reference numerals all refer to the same components.

[0022] Example 1

[0023] like Figure 1-3 As shown, it includes a fluid heating tube 1, a ferrule nut 2, a rear ferrule 3, a front ferrule 4, a front baffle washer 5, a metal tennis ball 6, a rear baffle ring 7, a main body 8, an armored thermocouple 9, and a fluid outlet pipe 10. The main body 8 is a three-way structure. The fluid heating tube 1 is arranged on one side of the main body 8, and the fluid outlet pipe 10 is arranged on the other side of the main body 8. The armored thermocouple 9 is arranged on the top of the main body 8. The metal tennis ball 6 is located on the side of the main body 8 close to the fluid heating tube 1. The end measuring head of the armored thermocouple 9 is arranged at the center axis position inside the circular tube of the main body 8.

[0024] Furthermore, the ferrule nut 2 on one side is sequentially sleeved with the rear ferrule 3, the front ferrule 4, and the front washer 5 and is threadedly connected to the main body 8, so that the fluid heating tube 1 is fixedly connected to one side of the main body 8. The ferrule nut 2 on the other side is sequentially sleeved with the rear ferrule 3 and the front ferrule 4 and is threadedly connected to the main body 8, so that the fluid outlet pipe 10 is fixedly connected to the other side of the main body 8. The ferrule nut 2 on the top side is sequentially sleeved with the rear ferrule 3 and the front ferrule 4 and is threadedly connected to the main body 8, so that the armored thermocouple 9 is fixed to the fixed side of the main body 8.

[0025] The end of the fluid heating tube 1 contacts the front baffle washer 5, and the baffle ring 7 is processed integrally with the body 8. The baffle ring 7 and the front baffle washer 5 jointly limit the position of the metal tennis ball 6 to ensure that the metal tennis ball 6 will not slide out with the flow of the fluid.

[0026] The metal tennis ball 6 is made of copper with high thermal conductivity and has a mesh size of 100-200, so that the heated fluid at the outlet of the fluid heating tube 1 can be evenly mixed through the metal tennis ball 6.

[0027] The protrusions of the front baffle washer 5 and the rear baffle ring 7 in the body 8 are 30° slopes that gradually convex along the fluid flow direction, so that the fluid with higher temperature near the tube wall of the body 8 mixes with the fluid with lower temperature in the center of the tube, and generates small additional flow resistance.

[0028] The fluid heating tube 1, the ferrule nut 2, the rear ferrule 3, the front ferrule 4, the front baffle washer 5, the rear baffle ring 7, the body 8, and the fluid outlet pipe 10 are all made of 316 stainless steel.

[0029] Specifically, during installation, the main body 8 is a three-way structure, the ferrule nut 2 is fastened to the main body 8 by threads, and the fluid heating tube 1 is installed on one side of the main body 8. Before installation, the metal tennis ball 6, the front block gasket 5, the front ferrule 4, and the rear ferrule 3 are successively installed into the left side of the main body 8, and then the fluid heating tube 1 is installed and its end is in contact with the front block gasket 5. Finally, the ferrule nut 2 is installed and tightened to ensure that the fluid heating tube 1, the rear ferrule 3, the front ferrule 4, the front block gasket 5 and the main body 8 on the left side of the main body 8 are tightly attached to each other, the fluid outlet pipe 10, the rear ferrule 3, the front ferrule 4 and the main body 8 are tightly attached to each other, and the upper armored thermocouple 9, the rear ferrule 3, the front ferrule 4 and the main body 8 are tightly attached to each other to achieve pressure sealing.

[0030] After all components are installed, the fluid is injected and the fluid heating tube 1 before the ferrule nut 2 is heated. In this embodiment, direct current is used to electrically heat the metal tube wall of the fluid heating tube 1 to achieve isothermal heating, and the heat flux density is q. The entire device is wrapped with insulating material on the outside to prevent heat loss. Before the fluid passes through the front washer 5, the temperature of the fluid near the wall of the fluid heating tube 1 is greater than the temperature of the fluid at the center of the tube. There will be a radial temperature gradient at the same cross section of the heated fluid, such as Figure 3 As shown in the figure, T in Indicates the fluid inlet temperature, T f represents the temperature of the fluid in the tube, T b,outrepresents the average temperature of the fluid outlet; after the heated fluid flows out of the fluid heating tube 1, it first flows through the front baffle ring 5, so that the fluid with higher temperature near the tube wall is mixed with the fluid with lower temperature in the center of the tube. Then it flows through the metal tennis ball 6, so that the heated fluid is cross-mixed through the mixing tennis ball 6. In addition, the heat conduction effect of the metal tennis ball 6 further eliminates the radial temperature gradient of the fluid. Finally, it flows through the rear baffle ring 7, so that the heated fluid is fully mixed. At this time, T f =T b,out Since the outer side of the device is wrapped with a layer of insulation material, the temperature measured by the armored thermocouple 9 is the average temperature of the fluid at the outlet of the fluid heating pipe 1 T b,out The fluid inlet temperature Tin can be directly measured by thermocouple, and the average temperature of the fluid in the pipe can be obtained by calculation.

[0031] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A device for measuring the outlet temperature of a fluid in a heated circular tube under high pressure conditions, characterized in that: The invention comprises a fluid heating tube (1), a ferrule nut (2), a rear ferrule (3), a front ferrule (4), a front baffle washer (5), a metal tennis ball (6), a rear baffle ring (7), a body (8), an armored thermocouple (9), and a fluid outlet pipe (10). The body (8) is a three-way structure. The fluid heating tube (1) is arranged on one side of the body (8), and the fluid outlet pipe (10) is arranged on the other side of the body (8). The armored thermocouple (9) is arranged on the top of the body (8). The metal tennis ball (6) is located on a side of the body (8) close to the fluid heating tube (1). The end measuring head of the armored thermocouple (9) is arranged at the center axis position inside the circular tube of the body (8).

2. The device for measuring the outlet temperature of fluid in a heated circular tube under high pressure conditions according to claim 1, characterized in that: The ferrule nut (2) on one side is sequentially sleeved with the rear ferrule (3), the front ferrule (4), and the front washer (5) and is threadedly connected to the body (8), so that the fluid heating tube (1) is fixedly connected to one side of the body (8); the ferrule nut (2) on the other side is sequentially sleeved with the rear ferrule (3), the front ferrule (4), and is threadedly connected to the body (8), so that the fluid outlet tube (10) is fixedly connected to the other side of the body (8); the ferrule nut (2) on the top side is sequentially sleeved with the rear ferrule (3), the front ferrule (4), and is threadedly connected to the body (8), so that the armored thermocouple (9) is fixed to the top side of the body (8).

3. The device for measuring the outlet temperature of fluid in a heated circular tube under high pressure conditions according to claim 2, characterized in that: The end of the fluid heating tube (1) contacts the front baffle washer (5), and the baffle ring (7) and the body (8) are processed as one piece. The baffle ring (7) and the front baffle washer (5) jointly limit the position of the metal tennis ball (6), thereby ensuring that the metal tennis ball (6) does not slide out with the flow of the fluid.

4. The device for measuring the outlet temperature of fluid in a heated circular tube under high pressure conditions according to claim 1, characterized in that: The metal tennis ball (6) is made of copper with high thermal conductivity and has a mesh size of 100-200, so that the heated fluid at the outlet of the fluid heating tube (1) can be evenly mixed through the metal tennis ball (6).

5. The device for measuring the outlet temperature of fluid in a heated circular tube under high pressure conditions according to claim 1, characterized in that: The convex shape of the front baffle washer (5) and the rear baffle ring (7) in the body (8) is a 30° inclined surface that gradually convexes along the fluid flow direction, so that the fluid with a higher temperature near the tube wall of the body (8) is mixed with the fluid with a lower temperature in the center of the tube, and a small additional flow resistance is generated.

6. The device for measuring the outlet temperature of fluid in a heated circular tube under high pressure conditions according to claim 1, characterized in that: The fluid heating tube (1), the ferrule nut (2), the rear ferrule (3), the front ferrule (4), the front stopper washer (5), the rear stopper ring (7), the body (8), and the fluid outlet pipe (10) are all made of 316 stainless steel.

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