JP2015139763A - discharge device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature adjustable discharge device capable of accurately and quickly stabilizing the temperature of a liquid material stored in a syringe body, without enlarging a semiconductor heating-cooling element and a radiator.SOLUTION: A rod-like auxiliary heat exchanger is laid in the syringe body besides a massive main heat exchanger for covering the syringe body, and a temperature sensor is laid so as to be immersed in the liquid material stored in the syringe body for eliminating a deviation between a control target temperature value and the liquid material temperature, and the temperature is controlled by forming a temperature observation point of the liquid material.

Description

  The present invention relates to an air pulse type discharge device including a temperature controller for maintaining a liquid material contained in a syringe at a constant temperature.

  As a discharge device used in a process of applying a liquid material to a workpiece (object), an air pulse type discharge device is widely used. This is a method in which the liquid material contained in the syringe is pushed and discharged by air pressure, and the running cost is low because the discharge mechanism does not contact the liquid material.

  However, if the liquid material to be used changes in viscosity as the temperature changes, the discharge amount of the liquid material to be discharged is determined by the duration of the compressed air applied to the syringe in the air pulse type discharge device. Will change.

  Therefore, when using the liquid material as described above, temperature management is indispensable, and a discharge device having a temperature controller in the syringe is used.

  FIG. 5 is a configuration example of an air pulse type temperature-adjustable discharge device 5 using a conventional semiconductor heating / cooling element, and is a side view seen through a part of members. The temperature-adjustable discharge device 5 includes a syringe body 51 that contains a liquid material 54, a needle 52 that is provided at the lower end of the syringe body 51 and that discharges the liquid material 54 downward, An adapter 53 equipped with a tube for supplying air pressure to the syringe body 51 from the air source through the air pulse control device, and a massive heat exchanger formed so as to cover the periphery of the syringe body 51 and the needle 52 55, a temperature sensor 58 provided therein, a flat plate semiconductor heating / cooling element 56, and a radiator 57 installed so as to sandwich the semiconductor heating / cooling element 56 together with the heat exchanger 55. Yes.

  The temperature adjustment is achieved by maintaining the heat exchanger 55 at a predetermined temperature by feedback-controlling the semiconductor heating / cooling element by a temperature control device (not shown) based on the temperature indication value from the temperature sensor 58.

  In Patent Document 1, a semiconductor heating / cooling device made of a material having good thermal conductivity such as aluminum and attached so as to be in close contact with a heat exchanger arranged to surround the periphery of the syringe body. Disclosed is a temperature-controlled discharge device that can be miniaturized.

Japanese Utility Model Publication 5-26168

  When the liquid material 54 includes particles, depending on the specific gravity of the particles, the particles initially settle down below the syringe body 51 in the liquid material from what was initially uniformly dispersed in the liquid material. . Therefore, in the product application process in which such a liquid material is applied, there is a difference in the content of particles in the resin applied every discharge cycle, which may lead to deterioration of product quality.

In order to reduce inconveniences in the above-described application process, it is desired that the liquid material 54 is stored in the syringe body 51 and then quickly stabilized at a predetermined temperature to shorten the application work time.

  However, since the syringe body 51 is made using a resin such as polypropylene, borosilicate glass, or the like, heat conductivity is insufficient, and in most cases, the liquid material 54 cannot be said to have good heat conductivity. In order to quickly stabilize the temperature of the liquid material, it is necessary to increase the heating / cooling capacity. As a result, the semiconductor heating / cooling element 56 and the radiator 57 are increased in size, which hinders the downsizing of the temperature-controlled discharge device.

Further, in the example of FIG. 5, the temperature observation point is installed inside the heat exchanger 55, but this means that the temperature of the liquid material 54 is located outside the feedback control loop, and is immediately responsive to temperature changes. It is difficult to say that the temperature is adjusted to be, and a deviation remains in the temperature reached between the heat exchanger 55 and the liquid material 54. This is because the parameter setting accuracy is lacking in the coating process using the liquid material containing particles as described above.

  In view of the above problems, an object of the present invention is to provide a temperature-adjustable discharge device capable of accurately and quickly stabilizing the temperature of a liquid material accommodated in a syringe body without increasing the size of the device. It is to be.

  In order to achieve the above object, according to the invention described in claim 1 of the present invention, in the air pulse type temperature-adjustable discharge device, the main heat exchanger disposed so as to surround the periphery of the syringe body; A temperature-adjustable discharge device that performs heat exchange with the liquid material using at least one auxiliary heat exchanger laid so as to be immersed in the liquid material housed in the syringe body As a result, the temperature of the liquid material can be quickly stabilized.

  In order to achieve the above object, according to a second aspect of the present invention, the auxiliary heat exchanger is supplied with a heat flow using at least one component of the main heat exchanger as an intermediate means. By setting it as the temperature control type | formula discharge apparatus of Claim 1, the temperature of liquid material can be stabilized quickly, without enlarging an apparatus.

  In order to achieve the above object, according to the invention described in claim 3 of the present invention, the temperature sensor is laid so as to be immersed in the liquid material accommodated in the syringe body, and the temperature is controlled by using the temperature observation point as the liquid material. By using the temperature-adjustable discharge device according to any one of claims 1 and 2, accurate temperature control without deviation between the set temperature value and the reached temperature of the liquid material can be performed.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature control-type discharge apparatus which can stabilize quickly the temperature of the liquid material accommodated in the syringe main body can be provided, without enlarging an apparatus.

FIG. 1 is a side view of a temperature-adjustable discharge apparatus according to an embodiment of the present invention, with some members seen through. FIG. 2 illustrates a flange joint provided with an auxiliary heat exchanger and a temperature sensor in an embodiment of the present invention. FIG. 2 (a) is a partial projection view seen from the side where the auxiliary heat exchanger and the temperature sensor are mounted. (B) is sectional drawing, (c) is the partial projection figure seen from the screw hole part direction for air piping connector fastening. 3A and 3B are schematic views showing an example of connecting the flange joint and the main heat exchanger using a catch clip, and FIG. 3B is a local projection view showing the appearance of the catch clip from the side. is there. 4A and 4B are front views showing the shape of the auxiliary heat exchanger, in which FIG. 4A shows a round bar shape, and FIG. 4B shows a ribbon shape twisted as a deformed bar shape. FIG. 5 is a side view of a conventional air-pulse-type temperature-adjusting discharge apparatus using a semiconductor heating / cooling element, with a part of the members being seen through.

  The temperature-regulating discharge device according to the present invention is not limited to a large main heat exchanger that covers the syringe body as a means for accurately and quickly stabilizing the temperature of the liquid material accommodated in the syringe body without increasing the size of the device. In addition, a rod-shaped auxiliary heat exchanger is laid in the syringe body. In addition, the auxiliary heat exchanger is supplied with a heat flow with the main heat exchanger as at least one component of the mediating means. Furthermore, in order to eliminate the deviation between the set temperature value and the temperature reached by the liquid material, a temperature sensor is laid so as to be immersed in the liquid material contained in the syringe body, and the temperature observation point is controlled as a liquid material. It is characterized by. Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a temperature-adjustable discharge device 1 having a configuration in which a rod-shaped auxiliary heat exchanger and a temperature sensor are laid in a syringe body, with a part of members being seen through.

In FIG. 1, the temperature-adjustable discharge device includes a syringe body 11 containing a liquid material 14 and a needle 12 that is provided at the lower end of the syringe body 11 and discharges the liquid material 14 downward. And an air pulse control device from a bulky main heat exchanger 15 formed so as to cover the periphery of the syringe body 11 and the needle 12, a flat plate semiconductor heating / cooling element 16, a radiator 17, and an air source (not shown). To supply air pressure through the tube to the syringe body 11 via the air piping connector 13, the flange joint 19 that engages with the syringe body 11, and the connector 13 is connected to the syringe body from the flange joint 19. At least one auxiliary heat exchanger 10 in the form of a rod, and the flange joint 19 toward the inside of the syringe body A temperature sensor 18 according to the Tagged thermocouple, and is composed of.
Here, the main heat exchanger 15 and the flange joint 19 are thermally / mechanically coupled via a gasket (not shown) made of a heat conductive silicone rubber or the like as necessary to reduce the contact thermal resistance. ing. The semiconductor heating / cooling element 16 is installed so as to be sandwiched between the main heat exchanger 15 and the radiator 17.

  The main heat exchanger 15, the flange joint 19, and the auxiliary heat exchanger 10 are made of a material having good thermal conductivity such as aluminum. The temperature sensor 18 is sealed with a sheath tube for protection.

  FIG. 2 illustrates a flange joint 19 provided with the auxiliary heat exchanger 10 and the temperature sensor 18, and FIG. 2A is a partial projection view seen from the side direction where the auxiliary heat exchanger 10 and the temperature sensor 18 are mounted. (B) is sectional drawing, (c) is the partial projection figure seen from the screw hole part 191 direction for air piping connector fastening. In the flange joint 19, an insertion portion 196 to the syringe body 11 is provided with an O-ring 195 for keeping the inside of the syringe body 11 sealed, and on the central axis for supplying air pressure into the syringe body 11. A screw hole 191 for fastening the vent 192 and the connector 13 is provided coaxially. Also, a screw through hole 193 is provided in the flange portion 194, and the heat flow generated in the semiconductor heating / cooling element 16 by the flange joint 19 being thermally / mechanically coupled to the main heat exchanger 15 is the main heat. It propagates to the auxiliary heat exchanger 10 through a mediating means composed of the exchanger 15 and the flange joint 19 and is transferred to the liquid material 14 accommodated in the syringe body 11.

  In addition, you may insert the heat conductive sheet which served as the gasket for the contact thermal resistance reduction between this flange joint 19 and the main heat exchanger 15 as needed. Further, in this example, two rod-shaped auxiliary heat exchangers 10 are used, but the number used may be set appropriately according to the syringe capacity.

  In the temperature adjustment, the temperature control device 2 observes the temperature of the liquid material 14 through the sensor lead wire 197 of the temperature sensor 18 drawn out from the flange joint 19, and the semiconductor heating / cooling element driving lead wire 167 is adjusted. The temperature of the liquid material 14 is feedback-controlled by adjusting the driving of the semiconductor heating / cooling element 16 and the temperature detection value is maintained at a predetermined value.

  In order to maintain the function of adjusting the temperature of the liquid material 14 immediately before the discharge even when the temperature control type discharge device 1 repeats the discharge cycle and the liquid level of the liquid material 14 in the syringe body 11 is lowered. It is preferable that the temperature measuring point (temperature measuring contact) 181 near the distal end of the syringe and the distal end portion 101 of the auxiliary heat exchanger 10 are installed near the discharge hole below the inside of the syringe body 11.

  In FIG. 2, the flange joint 19 and the main heat exchanger 15 are thermally and mechanically connected by fastening with a screw through a screw through hole 193 provided in the flange portion of the flange joint 19. A simple desorption mechanism may be appropriately provided between the flange joint 19 and the main heat exchanger 15 in order to shorten the time for installing the syringe body 11 containing the liquid material 14 in the temperature adjustment mechanism. FIG. 3 shows an example in which the flange joint 19 and the main heat exchanger 15 are connected to each other by a catch clip 151 having a sufficient tightening force as a simple detaching mechanism without exerting labor. In the example of FIG. 3, the arm bracket is attached to the side surface of the flange joint 19, and the catch clip body is attached to the side surface of the main heat exchanger 15.

  The flange joint 19 and the auxiliary heat exchanger 10 may be joined by a press-fitting or shrink-fitting method. However, it is preferable to have a structure that can be detached from the viewpoint of ease of maintenance such as cleaning and durability. FIG. 4A shows an example of the auxiliary heat exchanger 10 with a simple round bar-like heat exchange part 10a. A joint part 102 with the flange joint 19 is provided with a male thread by die processing, and the flange joint 19 and screwed.

  The shape of the heat exchanging part of the auxiliary heat exchanger 10 is not limited to the round bar shape of FIG. 4 (a), and various irregular bar shapes having an increased surface area by providing irregularities to increase the efficiency of heat exchange with the liquid material 14 Good. However, when the viscosity of the liquid material 14 is high, the amount of adhesion increases, and the liquid level near the center in the syringe is locally reduced. The shape of the exchange part is preferably optimized according to the viscosity of the liquid material 14. Further, when the liquid material 14 contains particles, it is preferable to set the shape of the heat exchange part so that the flow of the particles is not hindered. Furthermore, in order to provide smoothness and wear resistance, a surface such as DLC coating is used. Processing may be performed. FIG. 4B shows an example in which the heat exchange efficiency is improved by changing the shape of the heat exchanging portion to a deformed bar shape, and the shape of the heat exchanging portion 10b is a twisted ribbon.

  By the way, when the liquid material 14 accommodated in the syringe body 11 is a thermosetting resin, if overshoot or hunting occurs during the temperature control process, depending on the set temperature, the auxiliary heat exchange may occur. There is a possibility that a part of the resin around the vessel 10 reacts to increase the viscosity and cure. In such a case, it is preferable to reduce the ratio of the heat flow transferred from the auxiliary heat exchanger 10 to the liquid material 14 to the heat flow transferred from the main heat exchanger 15 through the syringe body 11 to the liquid material 14, Therefore, a temperature gradient may be appropriately maintained in the main heat exchanger 15 and the auxiliary heat exchanger 10. For example, a temperature gradient is set by inserting a gasket made of a heat conductive silicone rubber or the like between the flange joint 19 and the main heat exchanger 15 and adjusting the thickness of the gasket in the direction of increasing the thickness. Anyway.

  In the above configuration, by providing the auxiliary heat exchanger 10, the temperature can be quickly adjusted with respect to the temperature change of the liquid material 14. That is, the application work time can be shortened by quickly controlling the viscosity of the liquid material 14, and even if the liquid material 14 contained in the syringe body 11 contains particles, Smooth discharge is possible while suppressing fluctuations in the dispersed state of the particles.

In the temperature control type discharge device 1, the heat flow is propagated to the auxiliary heat exchanger 10 through the intermediate means constituted by the main heat exchanger 15 and the flange joint 19. However, the auxiliary heat exchanger and the main heat exchanger It is also possible to configure only the main heat exchanger as a medium for the heat flow generated in the semiconductor heating / cooling element.
For example, the auxiliary heat exchanger has an inverted shape of “J” like an umbrella handle, and the handle portion is directly connected to the main heat exchanger 15 and the flange joint 19 is changed to an adapter with a resin mold type air tube. (Not shown) is conceivable.

In addition, the present invention can be variously modified without changing the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Temperature control-type discharge apparatus 2 Temperature control apparatus 10 Auxiliary heat exchanger 10a Heat exchange part of a round bar-like auxiliary heat exchanger 10b Heat exchange part of a twisted ribbon-like auxiliary heat exchanger 11 Syringe body 12 Needle 13 For air piping Connector 14 Liquid material 15 Main heat exchanger 16 Semiconductor heating / cooling element 17 Radiator 18 Temperature sensor 19 Flange joint 101 Tip of auxiliary heat exchanger 102 Joint part of auxiliary heat exchanger with flange joint 151 Catch clip 167 Semiconductor heating Cooling element driving lead wire 181 Temperature measuring point of temperature sensor 191 Screw hole portion for fastening air piping connector 192 Ventilation port for supplying air pressure into syringe body 193 Screw through hole 194 Flange of flange joint Part 195 O-ring 196 Insertion part of flange joint to syringe body 197 Support for lead

Claims (3)

A main heat exchanger disposed so as to surround the periphery of the syringe body and at least one auxiliary laid so as to be immersed in the liquid material accommodated in the syringe body in the air pulse type temperature-controlled discharge device A heat exchanger,
A temperature-adjustable discharge device that performs heat exchange with the liquid material using a liquid. The temperature control type discharge device according to claim 1, wherein a heat flow is supplied to the auxiliary heat exchanger by using the main heat exchanger as at least one component of the mediating means. 3. The temperature-adjustable discharge device according to claim 1, wherein the temperature sensor is laid so as to be immersed in a liquid material accommodated in the syringe body, and the temperature observation point is controlled as a liquid material. .

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