JP6837248B1 - Pressure adjustment mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure adjusting mechanism capable of finely adjusting the pressure of a liquid discharged in a pressurized state. A pressure adjusting mechanism for adjusting the pressure of a liquid discharged in a pressurized state includes an upper disk 217, a wedge 208, and a connecting mechanism. The upper disc adjusts the pressure of the liquid by moving relative to the lower disc 219 and adjusting the clearance with the lower disc. The wedge is provided with a tapered surface 208b that moves straight and is inclined with respect to the direction of this straight movement. The connecting mechanism connects the upper disc and the wedge, and displaces the position of the upper disc with respect to the lower disc according to the contact position with the tapered surface. [Selection diagram] Fig. 2

Description

The present invention relates to a pressure adjusting mechanism that adjusts the pressure of a liquid discharged in a pressurized state.

In the homogenizer described in Patent Document 1, as a mechanism (pressure adjusting mechanism) for adjusting the pressure (homogeneous pressure) of the liquid flowing through the homogeneous valve, a mechanism using an air cylinder that changes the air pressure and a mechanism using an electric actuator are used. I am using it. There is also a mechanism that uses a liquid instead of an air cylinder (for example, a hydraulic mechanism).

Japanese Unexamined Patent Publication No. 2010-0176223

In Patent Document 1, an air cylinder is used for the pressure adjusting mechanism, but since the air layer in the air cylinder expands and contracts according to the pressure, the homo pressure is finely adjusted by driving the air cylinder. It's difficult. Further, although Patent Document 1 describes that an electric actuator is used as a pressure adjusting mechanism, no specific structure of the electric actuator is disclosed.

On the other hand, in a mechanism using a liquid (for example, a hydraulic mechanism), a sealing that elastically deforms is used in a portion that houses the liquid, but the elastic deformation of the sealing due to a change in the volume of the liquid affects the operation of the pressure adjusting mechanism. It is difficult to fine-tune the homo pressure by giving.

The present invention is a pressure adjusting mechanism for adjusting the pressure of a liquid discharged in a pressurized state, which includes an upper disk (217), a wedge (208), a connecting mechanism, and a first roller bearing (209a). , With a pressure sensor (301). The upper disc (217) moves with respect to the lower disc (219) and adjusts the pressure of the liquid passing through the clearance by adjusting the clearance with the lower disc (219). The wedge (208) performs only linear motion, and is formed on the opposite side of the tapered surface (208b) and the tapered surface (208b) that are inclined with respect to the direction of the linear motion, and is parallel to the direction of the linear motion. It has a flat surface (208a) . The connecting mechanism connects the upper disc (217) and the wedge (208), and displaces the position of the upper disc (217) with respect to the lower disc (219) according to the contact position with the tapered surface (208b). The first roller bearing (209a) comes into contact with the flat surface (208a) of the wedge (208) in a fixed state. The pressure sensor (301) detects the pressure of the liquid. The connecting mechanism has a second roller bearing (209b) that comes into contact with the tapered surface (208b) and a spring (212) that urges the second roller bearing (209b) onto the tapered surface (208b). The second roller bearing (209b) moves the upper disc (217) with respect to the lower disc (219) by moving in the moving direction of the upper disc (217) in response to the movement of the wedge (208). When the pressure detected by the pressure sensor (301) is lower than the target pressure, the wedge (208) moves so that the upper disk (217) approaches the lower disk (219), and the pressure detected by the pressure sensor (301) becomes When the pressure is higher than the target pressure, the wedge (208) moves so that the upper disc (217) separates from the lower disc (219).

The wedge (208) can be moved in a direction orthogonal to the moving direction of the upper disk (217) .

The coupling mechanism can include a spring unit (402). The spring unit (402) is compressed by receiving pressure from the liquid passing through the clearance via the upper disk (217) when the pressure of the liquid is higher than a predetermined upper limit of the operating pressure. Therefore, the upper disc (217) can be moved in the direction away from the lower disc (219).

The connecting mechanism can include a spline nut (213), a spline shaft (215), and a receiving shaft (216,400). The spline nut (213) supports the spring (212) with the second roller bearing (209b). The spline shaft (215) moves along the spline nut (213) in response to the movement of the second roller bearing (209b). The receiving shaft (216,400) is attached to the spline shaft (215) and supports the upper disc (217).

The receiving shaft (400) can be composed of a shaft (401) , a spring unit (402), and an adjusting nut (403) . The shaft (401) includes a flange portion (401b) and a shaft portion (401a) , and supports the upper disc (217). The spring unit (402) is arranged along the shaft portion (401a) of the shaft (401). The adjusting nut (403) engages with the threaded portion formed on the outer peripheral surface of the shaft portion (401a ) and compresses the spring unit (402) with the flange portion (401b). The receiving shaft (400) of the spring unit (402) that receives pressure from the liquid passing through the clearance through the upper disc (217) when the pressure is higher than a predetermined upper limit of the working pressure. By moving the shaft (401) with compression, the upper disc (217) can be moved in a direction away from the lower disc (219).

According to the present invention, since the position of the upper disk is displaced by using the tapered surface of the wedge, the position of the upper disk with respect to the lower disk can be finely adjusted, and as a result, the liquid discharged under pressure can be finely adjusted. The pressure can be fine-tuned to maintain the set pressure.

It is the schematic which shows the internal structure of the liquid supply apparatus which is 1st Embodiment. It is the schematic (longitudinal view of the wedge) which shows the internal structure of the liquid discharge device which is 1st Embodiment. It is the schematic (cross-sectional direction view of the wedge) which shows the internal structure of the liquid discharge device which is 1st Embodiment. It is a figure which shows the relationship between the movement of a wedge and the movement of an upper disk in 1st Embodiment. It is a figure which shows the deformation example of the lower surface (tapered surface) of a wedge. It is the schematic which shows the internal structure of the liquid discharge device which is 2nd Embodiment. It is sectional drawing of the receiving shaft in 2nd Embodiment. It is sectional drawing which disassembled the receiving shaft in 2nd Embodiment.

(First Embodiment)
(Structure of liquid supply device 100)
The liquid supply device 100 shown in FIG. 1 supplies liquid to the liquid discharge device 200 described later. The structure of the liquid supply device 100 will be described with reference to FIG. FIG. 1 is a schematic view showing the internal structure of the liquid supply device 100. The structure of the liquid supply device 100 is not limited to the structure shown in FIG. 1, and may be any structure that can supply the liquid to the liquid discharge device 200.

The liquid supply device 100 has a pair of plunger drive mechanisms 101, and each plunger drive mechanism 101 moves the plunger 102 in the direction of arrow Dp1 or the direction of arrow Dp2. The plunger drive mechanism 101 includes a power source (motor, etc., not shown) that generates a driving force for driving the plunger 102, and a transmission mechanism (not shown) that transmits the driving force from the drive source to the plunger 102. ..

The tip 102a of the plunger 102 is inserted into the pressurizing chamber 103a of the pressurizing cylinder 103. A sealing member 104 is arranged between the outer peripheral surface of the plunger 102 and the inner wall surface of the pressurizing chamber 103a.

The pressurizing cylinder 103 has a suction port 103b for sucking the liquid, and a tank (not shown) for accommodating the liquid is connected to the suction port 103b via a pipe (not shown). As a result, the liquid in the tank can move to the suction port 103b via the pipe. A check valve 105 is provided in the suction port 103b, and the suction port 103b is connected to the pressurizing chamber 103a via a connecting passage 103c. As a result, the liquid sucked from the suction port 103b can be guided to the pressurizing chamber 103a via the connecting passage 103c. By providing the check valve 105, the liquid moves only in the direction from the suction port 103b toward the pressurizing chamber 103a.

The pressurizing cylinder 103 has an outlet 103d for delivering the liquid, and the outlet 103d is connected to the pressurizing chamber 103a via a connecting passage 103e. As a result, the liquid in the pressurizing chamber 103a moves through the connecting passage 103e and is guided to the delivery port 103d. A check valve 107 is provided at the outlet 103d, and the liquid moves only in the direction from the connecting passage 103e to the outside of the outlet 103d.

A merging pipe 106 is connected to the pair of pressure cylinders 103. The merging pipe 106 has two suction ports 106a. One suction port 106a is connected to the delivery port 103d of one pressure cylinder 103, and the other suction port 106a is connected to the delivery port 103d of the other pressure cylinder 103. The merging pipe 106 is connected to the liquid discharge device 200 shown in FIGS. 2 and 3, and the liquid is supplied from the merging pipe 106 to the liquid discharge device 200.

(Operation of liquid supply device 100)
The operation of the liquid supply device 100 described above will be described below.

When the liquid is contained in the pressurizing chamber 103a, the plunger 102 moves in the direction of the arrow Dp1, so that the liquid in the pressurizing chamber 103a is compressed and the pressure in the pressurizing chamber 103a rises. As a result, the pressurized liquid can be supplied from the pressurizing chamber 103a to the liquid discharging device 200. After the liquid is sent out from the pressurizing chamber 103a, the plunger 102 moves in the direction of the arrow Dp2, so that the liquid supplied to the suction port 103b due to the suction force accompanying the movement of the plunger 102 is transferred to the connecting passage 103c. To move to the pressurizing chamber 103a. As a result, the liquid can be accommodated in the pressurizing chamber 103a.

By moving the plunger 102 in the directions of the arrows Dp1 and Dp2, a step of sucking the liquid into the pressurizing chamber 103a (referred to as a suction step) and a step of sending out the liquid from the pressurizing chamber 103a to supply the liquid to the liquid discharging device 200. The process (referred to as the supply process) can be performed alternately. Here, when the suction step is performed in one of the two plungers 102, the supply step is performed in the other plunger 102. As a result, the liquid can be alternately supplied to the liquid discharge device 200 from the two plungers 102.

(Structure of Liquid Discharge Device 200)
The liquid discharge device 200 shown in FIGS. 2 and 3 discharges the liquid supplied from the liquid supply device 100 at a predetermined pressure. The structure of the liquid discharge device 200 will be described with reference to FIGS. 2 and 3. FIG. 2 is a schematic view showing the internal structure of the liquid discharge device 200, and FIG. 3 shows the internal structure of the liquid discharge device 200 when the liquid discharge device 200 is viewed from the direction of the arrow Ds shown in FIG. It is a schematic diagram.

The merging pipe 106 is connected to the liquid discharge device 200. The merging pipe 106 is provided with a pressure sensor 301 for detecting the pressure of the liquid moving in the merging pipe 106. The pressure detected by the pressure sensor 301 is transmitted to the controller 302. The dotted line shown in FIG. 2 means an electrical connection. The controller 302 drives the motor 201 so that the pressure detected by the pressure sensor 301 becomes a preset target pressure. The target pressure may be a fixed value or a pressure in a predetermined range defined by the upper limit pressure and the lower limit pressure. The driving method of the motor 201 will be described later.

A drive pulley 202 is fixed to the output shaft 201a of the motor 201, and the drive pulley 202 rotates as the output shaft 201a rotates. The timing belt 203 is hung on the drive pulley 202 and the driven pulley 204, and transmits the rotational force of the drive pulley 202 to the driven pulley 204. The driven pulley 204 is fixed to one end of the ball screw 205, and rotates the ball screw 205 in the direction of the arrow R. The ball screw 205 is rotatably supported by a bearing 206.

The mechanism for transmitting the rotational force of the motor 201 to the ball screw 205 is not limited to the mechanism shown in FIG. That is, it suffices if the rotational force of the motor 201 can be transmitted to the ball screw 205 to rotate the ball screw 205, and a known mechanism for transmitting the rotational force can be appropriately adopted. Here, the mechanism for transmitting the rotational force of the motor 201 to the ball screw 205 can include a reduction mechanism configured by a gear or the like.

The ball screw 205 is engaged with the ball spline 207, and the rotational movement of the ball screw 205 is changed to the linear movement of the ball spline 207 (movement in the direction of the arrow Dl) by the engaging portion of the ball screw 205 and the ball spline 207. Will be converted.

A wedge 208 is connected to the tip of the ball spline 207, and the wedge 208 moves together with the ball spline 207. Specifically, the wedge 208 moves in the direction of the arrow Dh. As shown in FIG. 3, the shape of the cross section orthogonal to the longitudinal direction (horizontal direction in FIG. 2) of the wedge 208 is formed in a cross shape, and the wedge 208 has an upper surface 208a, a lower surface 208b, and a pair of side surfaces 208c. .. Each of the upper surface 208a and the pair of side surfaces 208c extends substantially parallel to the moving direction of the wedge 208 (direction of arrow Dh) and is composed of a flat surface.

The lower surface 208b is composed of a tapered surface that is inclined with respect to the moving direction of the wedge 208 (direction of arrow Dh). Specifically, at the base end portion of the wedge 208 (the connecting portion with the ball spline 207), the distance between the lower surface 208b and the upper surface 208a (the length in the vertical direction in FIG. 2) is the largest. Further, at the tip end portion of the wedge 208 (the end portion opposite to the base end portion), the distance between the lower surface 208b and the upper surface 208a (the length in the vertical direction in FIG. 2) is the smallest. Then, the distance between the lower surface 208b and the upper surface 208a becomes continuously smaller from the base end portion to the tip end portion of the wedge 208.

As shown in FIG. 3, the roller bearing 209a is in contact with each of the upper surface 208a and the pair of side surfaces 208c of the wedge 208, and the roller bearing 209b is in contact with the lower surface 208b of the wedge 208. As a result, the wedge 208 can move in the direction of the arrow Dh while being supported by the roller bearings 209a and 209b. The three roller bearings 209a are fixed to the apparatus main body 210, and the roller bearing 209b can move in the vertical direction of FIG. 2 or 3 with respect to the apparatus main body 210. By using the roller bearings 209a and 209b, the frictional resistance at the contact portion between the wedge 208 and the roller bearings 209a and 209b can be reduced.

As shown in FIG. 2, the wedge 208 can penetrate the device main body 210, and the tip portion of the wedge 208 (the portion indicated by the alternate long and short dash line in FIG. 2) may protrude from the device main body 210. Here, a cover 211 for covering the tip portion of the wedge 208 protruding from the device main body 210 is attached to the device main body 210.

The upper end surface of the spring 212 is in contact with the lower end surface of the roller bearing 209b, and the upper end surface of the spline nut 213 is in contact with the lower end surface of the spring 212. The spring 212 is arranged and supported between the roller bearing 209b and the spline nut 213 in the vertically compressed state of FIG. 2 or FIG. As a result, an urging force for pulling the roller bearing 209b and the spline nut 213 apart is generated between the roller bearing 209b and the spline nut 213 in the vertical direction of FIG. 2 or FIG. The lower end surface of the spline nut 213 receives the urging force of the spring 212 and is pressed against the nut holding member 214.

The inner peripheral surface of the spline nut 213 is engaged with the outer peripheral surface of the spline shaft 215, and the spline nut 213 movably supports the spline shaft 215 in the vertical direction of FIG. 2 or FIG. The upper end surface of the spline shaft 215 is in contact with the lower end surface of the roller bearing 209b. When the roller bearing 209b moves downward in FIG. 2 or 3 as described later, the roller bearing 209b presses the spline shaft 215 downward in FIG. 2 or 3 against the urging force of the spring 212. Here, the spline shaft 215 moves according to the movement of the roller bearing 209b.

The spline shaft 215 has a hole portion 215a, and the hole portion 215a extends from the lower end surface of the spline shaft 215 in the upward direction of FIG. 2 or 3 (the moving direction of the spline shaft 215). A receiving shaft 216 is fixed to the hole 215a, and the receiving shaft 216 moves together with the spline shaft 215.

A base end portion (in other words, an upper end portion) of the upper disc 217 is fixed to the lower end surface of the receiving shaft 216, and the receiving shaft 216 supports the upper disc 217. The upper disc 217 moves together with the receiving shaft 216. A guide 218 is provided on the outer peripheral surface of the upper disc 217, and the guide 218 guides the upper disc 217 in the vertical direction of FIG. 2 or FIG.

A space S through which the liquid moves is formed below the tip end portion (in other words, the lower end portion) of the upper disk 217. This space S is a space surrounded by the apparatus main body 210, the upper disk 217, the guide 218, the lower disk 219, and the impact ring 220. The lower end surface of the lower disk 219 is supported by the disk support 221.

The lower disk 219, the disk support 221 and the apparatus main body 210 are provided with a communication passage 222 for guiding the liquid to the space S. The connecting passage 222 is connected to the above-mentioned merging pipe 106. On the other hand, as shown in FIG. 3, a connecting passage 223 is connected to the space S, and the connecting passage 223 guides the liquid discharged from the space S to the discharge pipe 224. A liquid having a predetermined pressure is discharged from the discharge pipe 224.

(Operation of liquid discharge device 200)
In the liquid discharge device 200, the clearance between the upper disc 217 and the lower disc 219 (hereinafter referred to as “valve opening”) is adjusted by driving the motor 201 to move the upper disc 217, and the liquid discharge device 200 is used. The pressure of the liquid discharged from 200 is adjusted so as to reach the target pressure described above. As described above, when the motor 201 is rotated, the ball screw 205 is rotated in the direction of the arrow R, so that the ball spline 207 moves in the direction of the arrow Dl and the wedge 208 moves in the direction of the arrow Dh.

As shown in FIG. 4, the moving direction of the wedge 208 (direction of arrow Dh) includes the direction of arrow Dh1 and the direction of arrow Dh2. FIG. 4 is a schematic view illustrating the movement of the upper disk 217 with the movement of the wedge 208. In FIG. 4, the lower surface (tapered surface) 208b of the wedge 208 is shown in an easy-to-understand manner. In the present embodiment, the moving direction of the wedge 208 (directions of arrows Dh1 and Dh2) is orthogonal to the moving direction of the upper disk 217 (directions of arrows Dv1 and Dv2).

As described above, the wedge 208 is connected to the upper disk 217 via a roller bearing 209b, a spline shaft 215 and a receiving shaft 216. Here, the position of the upper disk 217 can be displaced according to the position where the roller bearing 209b contacts the lower surface (tapered surface) 208b of the wedge 208. The taper angle of the lower surface (tapered surface) 208b can be appropriately determined in consideration of the moving amount of the upper disk 217 according to the moving amount of the wedge 208.

When the roller bearing 209b is in contact with the end portion 208b1 of the lower surface (tapered surface) 208b, when the wedge 208 moves in the direction of the arrow Dh1, the lower surface (tapered surface) 208b pushes the roller bearing 209b downward, whereby the roller bearing 209b is pushed downward. The upper disk 217 moves in the direction of arrow Dv1. The end portion 208b1 is an end portion of the lower surface (tapered surface) 208b located on the tip end side of the wedge 208. The direction of the arrow Dv1 is a direction approaching the lower disk 219, and when the upper disk 217 approaches the lower disk 219, the valve opening becomes narrower and the pressure of the liquid discharged from the liquid discharge device 200 can be increased. it can.

When the roller bearing 209b is in contact with the end portion 208b2 of the lower surface (tapered surface) 208b and the wedge 208 moves in the direction of the arrow Dh2, the roller bearing 209b receives the urging force of the spring 212 and the lower surface (tapered surface). ) Moves upward while in contact with 208b. As a result, the upper disk 217 moves in the direction of the arrow Dv2. The end portion 208b2 is an end portion of the lower surface (tapered surface) 208b located on the base end portion side of the wedge 208. The direction of the arrow Dv2 is the direction away from the lower disk 219, and when the upper disk 217 is separated from the lower disk 219, the valve opening degree is widened and the pressure of the liquid discharged from the liquid discharge device 200 can be reduced. ..

According to the present embodiment, the position of the upper disk 217 with respect to the lower disk 219, in other words, the valve opening degree, can be adjusted by changing the contact position of the roller bearing 209b with respect to the lower surface (tapered surface) 208b of the wedge 208. it can. Further, since the lower surface (tapered surface) 208b is a continuous inclined surface, by moving the roller bearing 209b along the lower surface (tapered surface) 208b, the position of the upper disk 217 with respect to the lower disk 219, in other words, the valve. The opening can be finely adjusted.

The adjustment of the valve opening degree described above is performed by the controller 302. When the pressure detected by the pressure sensor 301 is lower than the target pressure described above, the controller 302 drives the motor 201 to move the upper disk 217 toward the lower disk 219 (direction of arrow Dv1 shown in FIG. 4). By doing so, the pressure of the liquid discharged from the liquid discharge device 200 is increased. As a result, the pressure of the liquid discharged from the liquid discharge device 200 can reach the target pressure.

On the other hand, when the pressure detected by the pressure sensor 301 is higher than the target pressure described above, the controller 302 drives the motor 201 to move the upper disk 217 away from the lower disk 219 (direction of arrow Dv2 shown in FIG. 4). By moving to, the pressure of the liquid discharged from the liquid discharge device 200 is reduced. As a result, the pressure of the liquid discharged from the liquid discharge device 200 can reach the target pressure.

In the present embodiment, the entire lower surface 208b of the wedge 208 is formed by the tapered surface, but only a part of the lower surface 208b may be formed by the tapered surface. In this case, the roller bearing 209b may be brought into contact with the region in which the tapered surface is formed.

In the present embodiment, the lower surface (tapered surface) 208b is inclined as shown in FIG. 4, but the lower surface (tapered surface) 208b can also be inclined as shown in FIG. In the configuration shown in FIG. 5, the distance between the lower surface 208b and the upper surface 208a (the vertical length in FIG. 5) is the smallest at the base end portion (connecting portion with the ball spline 207) of the wedge 208. Further, at the tip end portion of the wedge 208 (the end portion opposite to the base end portion), the distance between the lower surface 208b and the upper surface 208a (the length in the vertical direction in FIG. 5) is the largest. Then, the distance between the lower surface 208b and the upper surface 208a increases continuously from the base end portion to the tip end portion of the wedge 208.

In the present embodiment, the upper surface 208a of the wedge 208 is composed of a flat surface extending substantially parallel to the moving direction of the wedge 208, but the present invention is not limited to this. As described in the present embodiment, it is sufficient that the upper disk 217 can be moved in the direction of the arrow Dv1 or the arrow Dv2 shown in FIG. 4 by using the lower surface (tapered surface) 208b of the wedge 208, as long as this function is fulfilled. The shape of the upper surface 208a of the wedge 208 can be changed.

(Second Embodiment)
A second embodiment of the present invention will be described. The present embodiment is a liquid discharge device 200 having a structure different from that of the first embodiment, and FIG. 6 shows an internal structure of the liquid discharge device 200 according to the present embodiment (internal structure corresponding to FIG. 3). Is shown. In the liquid discharge device 200 of the present embodiment, the structure other than the receiving shaft 216 described in the first embodiment is the same as that of the first embodiment. Hereinafter, the structure of the receiving shaft 400 of the present embodiment will be described with reference to FIGS. 7 and 8. The receiving shaft 216 described in the first embodiment and the receiving shaft 400 described in the present embodiment can be used properly according to the purpose of use of the liquid discharge device 200 and the like.

The receiving shaft 400 includes a shaft main body 401, a spring unit 402 in which a plurality of disc springs are laminated, an adjusting nut 403, and a lock nut 404. The shaft portion 401a of the shaft body 401 penetrates through the through hole 402a of the spring unit 402, and the threaded portion formed on the outer peripheral surface of the shaft portion 401a is formed on the inner peripheral surface 403a of the adjusting nut 403. Engage with. The spring unit 402 and the adjusting nut 403 are arranged between the lock nut 404 and the flange portion 401b of the shaft body 401. The base end portion of the upper disk 217 described in the first embodiment is fixed to the fixed cylindrical hole 401c of the shaft body 401.

By rotating the adjusting nut 403, the adjusting nut 403 can be moved in a direction closer to the flange portion 401b, and the adjusting nut 403 can be moved in a direction away from the flange portion 401b. When the adjusting nut 403 is moved in the direction approaching the flange portion 401b, the adjusting nut 403 can increase the compressive force of the spring unit 402 by pressing the spring unit 402. On the other hand, when the adjusting nut 403 is moved away from the flange portion 401b, the spring unit 402 extends in the longitudinal direction of the shaft portion 401a, and the compressive force of the spring unit 402 can be reduced. After the adjustment nut 403 is positioned, the adjustment nut 403 is locked with respect to the shaft portion 401a by engaging the screw portion formed on the inner peripheral surface 404a of the lock nut 404 with the screw portion of the shaft portion 401a. Can be done.

Since the receiving shaft 400 has the spring unit 402, when the spring unit 402 compresses, the shaft main body 401 can be allowed to move, and the upper disc 217 can be moved in a direction away from the lower disc 219. In the present embodiment, when the pressure of the clearance between the upper disc 217 and the lower disc 219 rises excessively, the spring unit 402 is compressed to move the upper disc 217 away from the lower disc 219.

For example, when the liquid discharged from the liquid discharge device 200 contains excessively sized particles, the excessively sized particles clog the clearance between the upper disk 217 and the lower disk 219, so that the pressure of the clearance is increased. May rise excessively. In this case, by moving the upper disk 217 away from the lower disk 219 by compressing the spring unit 402, particles having an excessive size can pass through the clearance, and the clogging of the clearance can be eliminated. When the clogging of the clearance is cleared, the pressure of the clearance decreases, so that the upper disk 217 returns to the original state by the urging force of the spring unit 402. As described above, when the receiving shaft 400 of the present embodiment is used, when the pressure of the clearance rises excessively, the spring unit 402 is instantaneously compressed to widen the valve opening, thereby causing excessive particle clogging in the clearance. Then, the excessive pressure increase due to this clogging can be eliminated.

In the present embodiment, the spring unit 402 is configured by laminating a plurality of disc springs, but the present invention is not limited to this. As described above, in order to eliminate the excessive pressure rise in the clearance, it is sufficient that the spring unit 402 can be compressed instantaneously, and the spring unit 402 may be configured so as to perform such a function. ..

By using the liquid discharge device 200 described in the above-described embodiment, for example, an emulsification treatment or a crushing treatment can be performed. In the emulsification process, when the liquid containing the fat globules passes through the clearance between the upper disc 217 and the lower disc 219, the fat globules can be destroyed to generate minute fat globules. In the crushing treatment, for example, when the liquid containing the raw material fibers passes through the clearance between the upper disc 217 and the lower disc 219, the raw material fibers can be destroyed to generate fine fibers. In the crushing treatment, the clearance may be clogged with the raw material fibers, but by using the receiving shaft 400 described in the second embodiment, the clogging of the raw material fibers can be eliminated.

In the present embodiment, when the pressure of the clearance between the upper disk 217 and the lower disk 219 is within the pressure range for operating the liquid discharge device 200, the spring unit 402 is compressed so that the spring unit 402 is not compressed. You need to adjust the force. Specifically, the compressive force of the spring unit 402 can be adjusted so that the spring unit 402 is compressed only when the clearance pressure becomes higher than the upper limit of the pressure for operating the liquid discharge device 200. Thereby, when the pressure of the clearance is not excessively increased, the upper disk 217 can be held in a desired position by the urging force of the spring unit 402.

The liquid discharge device 200 of the present embodiment can be used in various technical fields. For example, in the field of textiles, cellulose nanofibers are being developed. Here, by supplying the liquid containing the raw material fibers to the liquid discharge device 200, the raw material fibers can be crushed in the liquid discharge device 200 to produce cellulose nanofibers.

On the other hand, in the chemical industry, emulsification steps are carried out in many processes, and as an example, silicone oil and water emulsions are used in a wide range of fields. By using the liquid discharge device 200 of the present embodiment, an emulsion of silicon oil having a fine particle size can be produced by discharging silicon oil under high pressure (for example, 150 MPa or more), and the liquid containing the emulsion is transparent. Can give sex.

Further, although the pigment-based paint (particles) is difficult to disperse in a medium such as water, the pigment-based paint is discharged in the medium under high pressure by using the liquid discharge device 200 of the present embodiment. It becomes easier to disperse. Further, when the pigment particles are dispersed in the ink liquid, the liquid ejection device 200 of the present embodiment can be used. Here, by ejecting the pigment particles under high pressure, fine pigment particles can be generated, and the pigment particles can be easily dispersed in the ink liquid. Further, when the particles used in cosmetics are miniaturized, the liquid discharge device 200 of the present embodiment can be used. By using the liquid discharge device 200 to discharge the cosmetic raw material under high pressure, fine particles can be generated.

100: Liquid supply device, 200: Liquid discharge device, 201: Motor,
205: Ball screw, 207: Ball spline, 208: Wedge,
209a, 209b: Roller bearing, 212: Spring, 213: Spline nut,
215: Spline shaft, 216, 400: Receiving shaft,
217: Upper disc, 219: Lower disc, 401: Shaft,
402: Spring unit, 403: Adjustment nut, 404: Lock nut

Claims (5)

A pressure adjustment mechanism that adjusts the pressure of the liquid discharged under pressure.
An upper disc that adjusts the pressure of the liquid passing through the clearance by moving relative to the lower disc and adjusting the clearance with the lower disc.
A wedge that performs only straight-ahead motion, and has a tapered surface that is inclined with respect to the direction of this straight-ahead motion, and a flat surface that is formed on the opposite side of the tapered surface and is parallel to the direction of the straight-ahead motion. With wedges
A connecting mechanism that connects the upper disc and the wedge and displaces the position of the upper disc with respect to the lower disc according to the contact position with the tapered surface.
A first roller bearing that comes into contact with the flat surface in a fixed state,
It has a pressure sensor that detects the pressure of the liquid.
The connecting mechanism includes a second roller bearing that comes into contact with the tapered surface and a spring that urges the second roller bearing to the tapered surface.
The second roller bearing moves the upper disc with respect to the lower disc by moving in the moving direction of the upper disc in response to the movement of the wedge.
When the pressure detected by the pressure sensor is lower than the target pressure, the wedge is moved so that the upper disk approaches the lower disk, and when the pressure detected by the pressure sensor is higher than the target pressure, the upper disk is moved. A pressure adjusting mechanism, characterized in that the wedge is moved away from the lower disc. The pressure adjusting mechanism according to claim 1, wherein the wedge moves in a direction orthogonal to the moving direction of the upper disk. The connecting mechanism has a spring unit and has a spring unit.
The spring unit is compressed by receiving pressure from the liquid passing through the clearance through the upper disk when the pressure is higher than a predetermined upper limit of the operating pressure. The pressure adjusting mechanism according to claim 1 or 2 , wherein the upper disk is moved in a direction away from the lower disk. The connecting mechanism is
A spline nut that supports the spring between the second roller bearing and
A spline shaft that moves along the spline nut in response to the movement of the second roller bearing,
A receiving shaft that is attached to the spline shaft and supports the upper disc,
The pressure adjusting mechanism according to any one of claims 1 to 3, wherein the pressure adjusting mechanism comprises. The receiving shaft
A shaft body having a flange portion and a shaft portion and supporting the upper disc, and
A spring unit arranged along the shaft portion and
An adjusting nut that engages with a screw portion formed on the outer peripheral surface of the shaft portion and compresses the spring unit with the flange portion.
Have,
The receiving shaft accompanies compression of the spring unit that receives pressure from the liquid passing through the clearance through the upper disc when the pressure is higher than a predetermined upper limit of the working pressure. The pressure adjusting mechanism according to claim 4 , wherein the upper disc is moved in a direction away from the lower disc by moving the shaft body.