JPS63103906A - Simple type heat exchanger - Google Patents

Abstract

PURPOSE:To obtain a small-sized heat exchanger for compressed gas which is small in heating value by circulating outside air to the surface of piping where compressed gas flow and supplying the compressed gas whose temperature is close to that of the outside air. CONSTITUTION:The compressed gas enters the piping 52 through a connection nozzle 50 from a pressure source and flows out of a connection nozzle 54 to a measuring instrument main body. The piping 52 is covered with a cover 56 and a fan motor 58 for circulating the air is installed inside. Many outside air intakes 56 and outside air outlets 56B are bored in the cover 56. Further, plural radiation fins 60 for increasing the contacting surfaces for the outside air are provided in front of and behind the piping 52. Then when a motor 58 is rotated, the outside air circulates in the piping 52 and on the surfaces of the fins 60 and the temperature of the compressed air in the piping 52 approximates to the outside temperature. Therefore, the compressed air which is almost at the outside temperature (room temperature) is supplied to the measuring instrument main body to reduce the strain of the structure body, thereby taking a measurement with high accuracy.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a simple heat exchanger, and particularly to a simple heat exchanger suitable for use in a measuring instrument having a groove before using compressed air, such as an air bearing or an air balance tjM iF+.

[Conventional technology]

Three-dimensional measurement (1), which measures the shape of an object using a probe that can move three-dimensionally relative to the object, is used in all industries because it can easily measure a wide variety of shapes with a high rate of failure. It is used in the field. Recently, in order to meet the demand for sub-chamber accuracy in the hundreds and five functions, air bearings that use compressed air, air balance &l11, etc. have been incorporated into the structure part. FIG. 5 shows an example of a conventional moving bridge type coordinate measuring machine using an air bearing as an example of a compressed air utilization mechanism. In this three-dimensional measurement 18, the probe 12 is
can be moved three-dimensionally by sliding an X-axis slider 14, a Y-axis slider 16, and a two-axis slider 18,
The shape of the object to be measured can be measured by reading the displacement 8 m of the probe 12 using scales (not shown) provided on each axis. Each slider 14, 16, 18 is supported by an air bearing, and the groove structure of the air bearing of the Y@slider 16 is shown in FIG. FIG. 6 is a view taken from the direction of the arrow {circle around (2)} in FIG. 5. In this air bearing 20, Yt* is connected to the guide rail 22 via three air pads 24.
A lower end support portion 16A of the leg portion 16B of the slider 16 is supported. Each air bud 24 includes compressor dirt pipes, etc.
Compressed air is supplied from an external pressure source (not shown) through the air tube 26, and this compressed air is supplied to each air bud 24.
The air is constantly blown out toward the guide rail 22 from the pores on the bottom surface of the guide rail 22. Therefore, unlike mechanical bearings, there is no contact, and the two movements are smooth and there is no wear, making it possible to measure higher granularity. Also, Fig. 7 shows another example of 'R4M using compressed air.
This figure shows another example of the conventional three-dimensional measurement system using the air balance d structure proposed by the applicant in Japanese Patent Laid-Open No. 57-73601. In this air balance gate structure 30, a piston (not shown) connected to a connecting frame 32 is configured to receive a damping effect of compressed air supplied from an air tube 34. Therefore, zI engaged with the connecting frame 32
The III slider 18 and the probe 12 have high functionality, such as not falling even if the operator releases the hand, and requiring less load when operating them. The three-dimensional measuring device that controls these compressed air utilization mechanisms is generally installed in a constant temperature room or the like where the V temperature is controlled to be constant at, for example, 20° C., and the accuracy of the measuring device is guaranteed in that state.

[Problems to be solved by the invention]

However, the temperature of compressed air supplied from an external pressure source, for example in the case of a compressor, is higher than room temperature due to adiabatic compression, and in the case of factory piping, heat exchange occurs midway through the piping, so in summer The temperature is high, and in winter it can be much lower than room temperature. Therefore, even if the measuring device is installed in a room with a temperature of 20°C, when compressed air is supplied as described above, there will be a temperature difference between the part through which the compressed air flows and the part that is acclimatized to room temperature. This has caused problems such as deformation of the structure and deterioration of accuracy. In order to solve these problems, it is possible to control the temperature of compressed air using an electric cooler or heater, but coolers and heaters are expensive and large, and above all, the control device itself Since the heat generating port is large, it has the problem of being difficult to introduce into a constant temperature room or the like. [Object of the Invention] The present invention has been made to solve the above-mentioned conventional problems, and its object is to provide a simple heat exchanger for compressed gas that is advantageous in cost, small in size, and generates little heat. purpose.

[Means to solve the problem]

The present invention provides a preheating type heat exchanger including piping having a connection port to which a pressure source is connected and into which compressed gas flows, and the Pii!
The above object is achieved by providing means for circulating outside air over the surface of the pipe, and supplying compressed gas at a temperature close to the outside air from the other connection port of the pipe. Further, in the actual M aspect of the present invention, the pipe is covered with a cover having an outside air intake hole and an outside air exhaust hole. Furthermore, in an embodiment of the present invention, a plurality of radiation fins are arranged on the pipe. Further, in an embodiment of the present invention, the means for circulating the outside air is a fan motor.

[Effect]

In the present invention, a simple heat exchanger is constituted by a pipe having a connection port to which a pressure source is connected and into which compressed gas flows, and a means for circulating outside air to the surface of the pipe. Therefore, the temperature of the compressed air can be brought close to room temperature without using a cooler or heater, which is advantageous in terms of cost. Moreover, it is small in size and generates less heat. Further, when the pipe is covered with a cover having an outside air intake hole and an outside air exhaust hole, the heat exchange efficiency is improved. Furthermore, heat exchange efficiency is also improved when a plurality of heat radiation fins are arranged in the pipe. Furthermore, when the means for circulating the outside air is a fan motor, the configuration is simple. (Example) Hereinafter, an example of a column-moving jig polar type three-dimensional measurement I in which an embodiment of the simple "r2 W exchanger according to the present invention is disposed will be described in detail with reference to the drawings. The three-dimensional measuring machine 8 is configured as shown in FIG.
3. Instead of the X-axis slider, the stage 10 is slid in the X direction by an air bearing, the Y-axis slider 16 supports the column 34 and slides in the Y direction, and the probe 12 is supported and moved in the Z direction. The sliding Z@sliders 18 are also each equipped with air bearings. In the figure, 3G is the object to be measured. Although the probe 12 is provided as a means for indicating the measurement point, a video camera or the like may also be used. FIG. 4 shows the air supply system of the three-dimensional Wl constant machine 8, in which a pressure source 38 such as a compressor or factory piping is connected to a simple heat exchanger 40 according to the present invention, a filter 42, a regulator 44, etc. Compressed air is supplied via a pressure gauge 46. Note that the filter 42 and regulator 44 can also be installed between the simple heat exchanger 40 and the pressure source 38. Said I7! I-easy type heat exchange 1! Y! The container 4o is constructed as shown in FIGS. 1 and 2, and compressed air supplied from a pressure source enters the pipe 52 from one connection nozzle 50.
It is adapted to flow out from the other connecting nozzle 54 into the measuring body. The pipe 52 is covered with a cover 56, and a fan motor 58 is installed as a means for circulating air inside. The cover 56 is provided with a large number of outside air intake holes 56A for taking in air outside the cover (outside air) and many outside air exhaust holes 56B for discharging air. Furthermore, air outside the pipe (outside air) is provided before and after the pipe 52.
A plurality of radiation fins 60 are provided to increase the contact area by 1. The material of the piping 52 and the radiation fins 60 is preferably metal, such as copper or aluminum, which is a good conductor of heat, but it may also be made of synthetic resin rubber-based material. The effects of the embodiment will be explained below. When the fan motor 58 rotates, outside air circulates over the piping 52 and the surfaces of the radiation fins 60. Therefore, the temperature of the compressed air inside the pipe becomes closer to the temperature of the outside air. Therefore, the main body of 3D measurement ■8 can measure the outside air temperature (room temperature).
Compressed air close to the original temperature is supplied, reducing distortion of the structure and enabling more accurate measurements. In this example, since the simple heat exchange rA40 was provided with the cover 56, the heat exchange efficiency was high. Note that it is also possible to omit the cover 56. Further, in this embodiment, since the heat radiation fins 60 are provided before and after the pipe 52, the heat exchange efficiency is high. Note that it is also possible to omit the radiation fins 60. Furthermore, in this embodiment, since the fan motor 58 is used as a means for circulating outside air, the means for circulating outside air can be constructed at low cost. Note that the means for circulating the outside air is not limited to this, and other methods such as Inh'4, which exchanges heat between the pipe 52 and the outside air using a heat vibrator, can also be considered. In addition, in this embodiment, the pipe 5 of the simple heat exchanger 40
Since 2 is a curved pipe, the area of contact with the outside air can be increased. Note that the shape of the pipe 52 is not limited to this, and as long as it can increase the area of contact with the outside air, it is also possible to use a groove end made of many layers of thin air layers, for example. In the above embodiments, the present invention was applied to an air bearing of a three-dimensional measuring machine, but the scope of application of the present invention is not limited thereto, and can be similarly applied to a minus-dimensional sub-length. Further, it can be similarly applied to a measurement n having an air balance of one side as shown in FIG. 7, and a general measurement d having one use of compressed air.

【Effect of the invention】

As explained above, according to the present invention, compressed air can be brought close to the air temperature without using a cooler or heater, and has excellent effects such as being advantageous in cost, being compact, and generating less heat.

[Brief explanation of the drawing]

FIG. 1 is a front cross-sectional view showing the configuration of an embodiment of a simple heat exchanger according to the present invention, FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1, and FIG. FIG. 4 is a perspective view showing the overall configuration of an example of a column-moving jig polar type coordinate measuring machine having an air bearing, in which the embodiment is adopted; FIG. 4 is a system diagram showing an air supply system of the coordinate measuring machine; Figure 5 is a perspective view showing the configuration of an example of a conventional moving bridge type coordinate measuring machine using air bearings, and Figure 6 does not show the configuration of the air bearing used in the aforementioned coordinate measuring machine. , a front view as seen from the direction of arrow ① in FIG. 5, and FIG. 7 is a cross-sectional view showing the main part configuration of another example of the conventional three-dimensional measuring machine 1 using an air balance FM. 8... Coordinate measuring machine, 20... Air bearing, 30... Air balance mechanism, 38... Pressure source, 40... Simple heat exchanger, 50154... Connection nozzle, 52... ...Piping, 56...Cover, 56A...Outside air intake hole, 56B...Outside air discharge hole, 58...Fan motor, 60...Radiating fin.

Claims (4)

[Claims] (1) A pipe having a connection port to which a pressure source is connected and into which compressed gas flows, and a means for circulating outside air on the surface of the pipe, and compressed gas at a temperature close to the outside air is supplied from the other connection port of the pipe. A simple heat exchanger characterized by supplying (2) The simple heat exchanger according to claim 1, wherein the pipe is covered with a cover having an outside air intake hole and an outside air exhaust hole. (3) The simple heat exchanger according to claim 1 or 2, wherein a plurality of radiation fins are arranged on the pipe. (4) The simple heat exchanger according to claim 1, wherein the means for circulating outside air is a fan motor.