JP6118155B2 - Check valve and diaphragm pump - Google Patents

Description

  The present invention relates to a check valve and a diaphragm pump using the check valve.

  FIG. 4 is a cross-sectional view showing a configuration of a conventional diaphragm pump. In the diaphragm pump, the outer peripheral portions of the diaphragms 5 and 6 having the center portion sandwiched between the disk members 2 and 3 connected to each other by the center rod 4 are sandwiched and fixed to both side portions of the pump body 1. Further, the inner working fluid chambers 7 and 8 and the outer pump chambers 9 and 10 are partitioned and formed through diaphragms 5 and 6, respectively.

  A suction port 13 is connected to the pump chambers 9, 10 on both sides via suction check valves 11, 12, and a discharge port 16 is connected via discharge check valves 14, 15. The working fluid chambers 7 and 8 on both sides communicate with working fluid holes 18 and 19 through which a working fluid, for example, air is alternately supplied and discharged by the switching valve 17. In addition, although the switching valve 17 is installed so that it may be embedded in the center part of the pump main body 1, it is taken out outside for convenience of explanation in drawing, the description about the structure and effect | action is mentioned later.

  As the check valves 11, 12, 14, and 15 in the diaphragm pump, for example, as shown in FIG. 5, a check valve 70 including a valve seat 71, a valve case 72, and a ball valve 73 is used. Yes. The valve seat 71 has a through hole 71 a that is opened and closed by a ball valve 73. The valve case 72 is a cylindrical body having a large-diameter opening 72a and a small-diameter opening 72b communicating with the large-diameter opening 72a via a reduced-diameter portion 72c. The valve case 72 has a large diameter at the step 71b of the valve seat 71. The inner peripheral edge of the opening 72a is fitted. The valve seat 71 and the valve case 72 are made of metal. The valve case 72 is attached to the check valve mounting portion of the pump body 1 as shown in FIG. 4, but it has been necessary to take the heavy form shown in FIG. Therefore, the cost is increased, and a casing structure for accommodating the assembled check valve 70 is required.

Japanese Utility Model Publication No. 62-95186

  In view of the above problems, an object of the present invention is to provide a check valve that has a simple structure and is compact and low in cost, and a diaphragm pump that uses the check valve.

The check valve of the invention according to claim 1, which has been made to solve the above problems,
A valve seat having a through hole;
A ball valve for opening and closing the flow of the fluid from the through hole;
A valve case that covers the ball valve movably between a position for opening the fluid and a position for closing the fluid,
The valve case has a maximum width smaller than the diameter of the ball valve, at least one notch for passing the fluid is formed in the movement direction of the ball valve, and is fitted to the outer periphery of the valve seat The valve case is fixed to the lock member, and the valve case is bent into a bowl shape by bending a plurality of metal plate arm portions extending radially from a central portion in the same direction. The cut portion is a space formed between the adjacent arm portions, and the lock member is formed in the circumferential direction on the inner periphery of the insertion hole into which the valve seat is inserted. The valve case has a locking claw that is formed to extend radially outward from the tip of the arm portion and is locked to the locking groove, and the valve seat includes the valve seat Contrary to case It is configured to be inserted from the side into the inserting hole, the tip of the arm portion, characterized in that said is sandwiched from both inside and outside of the valve seat and the locking member and the radial direction.

The check valve according to claim 2, which has been made in order to solve the above problem, is configured such that the valve case is formed in a bowl shape by bending four arm portions formed in an X character shape in the same direction. It is characterized by being.

The diaphragm of the invention according to claim 3 made to solve the above-mentioned problems is as follows.
A pair of a working fluid chamber and a pump chamber partitioned by a diaphragm in order from the symmetry axis are arranged in a line-symmetric position inside the pump body,
A suction port communicates with the pump chamber via a suction check valve and a discharge port communicates with the pump chamber via a discharge check valve.
A center rod having both ends connected to the pair of diaphragms is supported through the working fluid chamber so as to be movable in the axial direction around a direction orthogonal to the symmetry axis,
By alternately supplying or discharging the working fluid to and from the pair of working fluid chambers by operating the switching valve, the volumes of the pair of working fluid chambers are alternately increased or decreased, and thus the pair of diaphragms is reduced. In the diaphragm pump that moves and reciprocates the center rod in conjunction with the center rod,
The check valve according to claim 1 or 2 is used as the suction check valve and the discharge check valve.

  According to the check valve of the first aspect of the present invention, a valve seat having a through hole, a ball valve for opening and closing the flow of fluid from the through hole, and a position at which the ball valve opens the flow of fluid. A valve case movably covering the closed position, wherein the valve case has a maximum width smaller than the diameter of the ball valve, and at least one notch for allowing the fluid to pass therethrough moves the ball valve. Since it is formed in the direction, a check valve with a simple structure and a compact size can be obtained.

In addition , a lock member fitted to the outer periphery of the valve seat is further provided. Since the valve case is fixed to the lock member, the valve case is firmly fixed.

Further , the valve case is formed in a bowl shape by bending a plurality of arm portions extending radially from the central portion in the same direction, and the cut portion is a space formed between the arm portions adjacent to each other. Since the valve case can be manufactured by bending, it can be manufactured at low cost. Further, since the fluid easily passes through the cut portion, it is possible to cope with a large flow rate.

According to the check valve of the second aspect of the present invention, the valve case can be manufactured if the four arm portions formed by cutting the metal plate into the X-shape are bent in the same direction and formed into a bowl shape. An easy and low cost check valve can be obtained.

According to the check valve of the first aspect of the present invention, the lock member has the locking groove formed in the circumferential direction of the inner peripheral wall thereof, and the valve case is formed at the tip of the arm portion. Since it has the latching claw to be latched, the locking mechanism is simple and can be easily replaced.

According to the diaphragm pump of the invention described in claim 3, since the check valve according to claim 1 or 2 is used for the suction check valve and the discharge check valve, it can cope with a large flow rate and is clogged with dust. Can be reduced.

It is sectional drawing which shows the structure of the diaphragm pump which concerns on one embodiment of this invention. It is a top view of the detent mechanism of the switching valve in the diaphragm pump of FIG. It is a figure which shows the structure of the non-return valve used for the diaphragm pump of FIG. 1, (a) is a front view of a valve case, (b) is sectional drawing of a locking member, (c) is sectional drawing of a valve seat, (D) is sectional drawing of a non-return valve. It is sectional drawing which shows the structure of the conventional diaphragm pump. It is a figure which shows the structure of the non-return valve used for the diaphragm pump of FIG. 4, (a) is sectional drawing of a valve case, (b) is a front view of a valve seat, (c) is sectional drawing of a non-return valve. It is.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view showing the structure of a diaphragm pump according to an embodiment of the present invention. The diaphragm pump has working fluid chambers 7 and 8 in a line-symmetrical position inside the pump body 1 in order from the symmetry axis, and pump chambers 9 and 10 partitioned by the working fluid chambers 7 and 8 and the diaphragms 5 and 6. Are arranged in pairs. The pair of diaphragms 5, 6 are sandwiched at the center by the disk members 2, 3 and the outer periphery is sandwiched and fixed to the pump body 1, and are connected to both ends of the center rod 4. The center rod 4 is supported through the working fluid chambers 7 and 8 so as to be movable in the axial direction about the direction orthogonal to the symmetry axis. The volume of the pair of working fluid chambers 7 and 8 is alternately increased or decreased by alternately supplying or discharging a fluid, for example, air, to the pair of working fluid chambers 7 and 8 by operating the switching valve 17. As a result, the pair of diaphragms 5 and 6 are varied, and the center rod 4 interlocked therewith is reciprocated in the axial direction.

  A suction port 13 is connected to the pump chambers 9 and 10 on both sides via suction check valves 11A and 12A, and a discharge port 16 is connected via discharge check valves 14A and 15A. The working fluid chambers 7 and 8 on both sides are connected to working fluid holes 18 and 19 through which the working fluid is alternately supplied or discharged by the switching valve 17. The switching valve 17 is installed, for example, embedded in the central portion of the pump body 1, but is shown outside in the drawings for convenience of explanation.

  The pair of working fluid chambers 7 and 8 are connected to switching pressure decompression holes 21 and 22, respectively. The switching pressure decompression holes 21 and 22 are interlocked with the movement of the diaphragms 5 and 6 just before the end of the working fluid discharge operation. Pilot valves 23 and 24 for opening the switching pressure reducing holes 21 and 22 are provided. The pilot valves 23 and 24 have a valve body 25 screwed into the switching pressure reducing holes 21 and 22 and a diaphragm detector 26 loosely fitted in the valve body 25. An O-ring 27 as a valve body is attached to the rear small diameter portion of the diaphragm detector 26 so as to face the valve seat 28. Further, a compression coil spring 29 is mounted between the rear end of the diaphragm detector 26 and the opposed surface of the pump body 1, so that the tip of the diaphragm detector 26 protrudes into the working fluid chambers 7 and 8. .

  The switching valve 17 has, for example, substantially the same configuration as the switching valve described in Japanese Patent Publication No. 6-31650. The switching valve 17 desires switching compression chambers 32, 33 communicating with the switching pressure decompression holes 21, 22 on both sides on both end surfaces of the spool 31, and working fluid to the switching pressure chambers 32, 33 on both ends and the switching valve 17. The supply port 34 is connected via the orifices 35 and 36.

  The switching valve 17 includes ports 41 and 42 that are directly connected to the working fluid supply port 34, ports 43 and 44 that are directly connected to the working fluid holes 18 and 19 of the pump body 1, and ports that release air as working fluid to the atmosphere. 45. Each port is formed in a sleeve 46 that fits with the spool 31.

  Next, the operation of the diaphragm pump will be described. Air is introduced into the switching valve 17 from the working fluid supply port 34 at a predetermined pressure. At this time, the spool 31 is in a state where the port 41 is open and the port 42 is closed, and air enters the port 43 through the port 41 and further enters the working fluid chamber 7 of the pump body 1. At this time, the air in the working fluid chamber 8 on the opposite side is discharged from the working fluid hole 19 through the port 44 to the atmosphere from the port 45.

  Accordingly, the diaphragms 5 and 6 and the center rod 4 move to the left, the diaphragm 5 pushes the fluid in the left pump chamber 9 to the discharge port 16, and the diaphragm 6 moves to the right pump chamber from the suction port 13. Inhale fluid into 10.

  Immediately before the end of the leftward movement, the diaphragm detector 26 of the pilot valve 23 is pushed by the disk member 3, and the air in the switching pressure chamber 33 is changed into the pilot valve 23, the working fluid chamber 8, the working fluid hole 19, and the port. The air is exhausted to the atmosphere through 44 and 45 in sequence.

  At this time, since the air discharge flow rate at the pilot valve 24 is larger than the air supply flow rate at the orifice 36, the pressure balance applied in advance to the switching pressure chambers 32, 33 at both ends of the spool 31 is lost and the switching is performed. The pressure chamber 33 has a lower pressure.

  Accordingly, the spool 31 moves toward the switching pressure chamber 33, the port 41 is closed, the port 42 is opened, and the diaphragms 5, 6 and the center rod 4 are moved in the right direction.

  Immediately before the end of the rightward movement, the working fluid chamber is automatically switched in the same manner, and the pump action is repeated.

  Next, the detent mechanism 51 provided at one end of the switching valve 17 will be described. The detent mechanism 51 prevents the spool 31 from stopping at the neutral position. In the detent mechanism 51, a spring receiver 53 is provided at one end of a sleeve 46, and a shaft portion 54 that is integral with the spool 31 protrudes into the switching pressure chamber 32 through a hole in the center of the spring receiver 53. The spool operating body 57 is loosely fitted with a slight clearance in the axial direction. Wire springs 58 having a round cross section are attached symmetrically on both the left and right sides of the spool actuating body 57, and the wire springs 58 are inserted into the V grooves 60 of the upright portion 59 integrally formed on the left and right sides of the spring receiving body 53. The opposite side is attached.

  As shown in FIG. 2, the wire spring 58 is bent into an arc shape in a direction in which both sides thereof face each other with respect to the central straight portion, and is formed into a substantially C shape. The shaped part 62 is formed in parallel. Then, the end portions 61 on both sides of the wire spring 58 are rotatably attached to small holes provided on the side surfaces of the spool operating body 57, and the linear portion 62 of the wire spring 58 is attached to the spring receiving body 53. It is rotatably attached to a V-shaped groove 60 formed linearly. That is, the C-shaped wire spring 58 has an end 61 that is opposed to the C-shaped wire spring 58 through the notch, and is attached to the small hole of the spool operating body 57, and is rotated in the small hole. Further, the linear portion 62 of the wire spring 58 is attached to the V groove 60 and rotated inside the V groove 60.

  When the spool 31 is moved downward from the upward switching state shown in FIG. 1, the wire spring 58 is rotated downward about the V groove 60 of the spring receiving body 53, and between the spool operating body 57 and the spool operating body 57. Shrinked. Accordingly, as the spool 31 approaches the neutral position against the wire spring 58, the wire spring 58 is elastically deformed so that the end portion 61 approaches the linear portion 62, and stores a restoring force therein. Then, when the spool 31 slightly passes the neutral position, the wire spring 58 is rotated downward about the V-groove 60 instantaneously by the snap action by the repulsive force stored in the wire spring 58. Is forcibly switched to the lower limit instantly. In this switching operation, there is a clearance below the spool operating body 57 fitted to the shaft portion 54 before switching, so that only the spool operating body 57 is reversed below the neutral position with a light spring force. The inertia force acts on the end surface of the shaft portion 54 together with the pressing force of the wire spring 58, and the spool 34 is reliably switched.

  By the way, the check valves 11A, 12A, 14A, and 15A in the diaphragm pump include, for example, a check valve including a valve seat 81, a lock member 82, a valve case 83, and a ball valve 84, as shown in FIG. A valve 80 is used.

  The valve seat 81 and the ball valve 84 are made of the same material such as rubber, PTFE (polytetrafluoroethylene), and NBR. The lock member 82 and the valve case 83 are made of metal.

  The valve seat 81 is an annular valve seat and has a through hole 81 a serving as an inflow / outlet hole opened and closed by a ball valve 84. The lock member 82 is formed in an annular shape having an insertion hole 82a into which the valve seat 81 is inserted. A locking groove 82b that is formed in the circumferential direction and that locks the locking claw 83a1 in the valve case 83 is provided on the inner periphery of the insertion hole 82a.

  The valve case 83 includes, for example, four arm portions 83a produced by cutting a metal plate into an X shape, and a locking claw 83a1 formed by bending the tip of the arm portion 83a. The valve case 83 is formed in a bowl shape by bending the four arm portions 83a so that the opposing arm portions 83a have an arc shape. The notch 83b, which is a space formed between adjacent arm portions 83a, is set so that its maximum width d is smaller than the diameter of the ball valve 84 so as not to drop the accommodated ball valve 84. .

  When the check valve 80 having the structure shown in FIG. 3 is used as the suction check valves 11A and 12A and the discharge check valves 14A and 15A in the diaphragm pump, the open portion of the valve case 83 is conventionally cut by the cut portion 83b. Expanded from the structure. Therefore, it is possible to flow the fluid also in the side surface direction of the valve case 83, and it is possible to flow a large amount of fluid and to reduce the clogging of dust.

  Further, the casing structure in which the check valve 80 is accommodated in the flow path does not need to accommodate the entire check valve as in the conventional case, and a step portion for fixing the outer peripheral portion of the lock member 82 is formed in the flow path. The structure is simplified because it is only necessary.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation and application are possible.

  For example, in the above-described embodiment, the valve case 83 is fixed to the lock member 82. However, the present invention is not limited to this, and the lock case 83 may be omitted and fixed to the valve seat 82.

  In the above-described embodiment, the valve case is formed by bending four arm portions formed by cutting a metal plate into a cross shape. However, the present invention is not limited to this, and three or five or more are formed. It may be formed by cutting so as to be an arm part.

  In addition, the valve case is formed in a bowl shape by fixing each central part of a plurality of strips arranged radially by fixing means such as pasting or welding, and bending a plurality of arm parts extending from the central part in the same direction. You may form in.

  In the above-described embodiment, a spool-type switching valve is used as the switching valve 17. However, the present invention is not limited to this, and an electromagnetic valve is used instead of a pilot valve for a sensor (capacitance type or optical fiber type). An electric type that switches by a detection signal, a timer switching method that uses a solenoid valve, and that switches by a signal from a timer that replaces the pilot valve may be used.

  In the above-described embodiment, the check valve used in the diaphragm pump has been described. However, the check valve of the present invention is not limited to this and can be applied to various pumps and flow pipes.

DESCRIPTION OF SYMBOLS 1 Pump main body 2,3 Disc member 4 Center rod 5,6 Diaphragm 7,8 Working fluid chamber 9,10 Pump chamber 11A, 12A Suction check valve 14A, 15A Discharge check valve 80 Check valve 81 Valve seat 82 Lock member 82b Locking groove 83 Valve case 83a Arm part 83a1 Locking claw 83b Notch 84 Ball valve

Claims (3)

A valve seat having a through hole;
A ball valve for opening and closing the flow of the fluid from the through hole;
A valve case that covers the ball valve movably between a position for opening the fluid and a position for closing the fluid,
The valve case has a maximum width smaller than the diameter of the ball valve, and at least one notch for passing the fluid is formed in the moving direction of the ball valve ,
A lock member fitted to the outer periphery of the valve seat;
The valve case is fixed to the lock member ,
The valve case is formed in a bowl shape by bending a plurality of metal plate arm portions extending radially from a central portion in the same direction, and the cut portion is a space formed between the adjacent arm portions. der is,
The lock member has a locking groove formed in a circumferential direction on an inner periphery of an insertion hole into which the valve seat is inserted .
The valve case is to have a locking claw that is formed engaged with the locking groove so as to extend radially outward from the tip of the arm portion,
The valve seat is configured to be inserted into the insertion hole from the side opposite to the valve case,
A check valve characterized in that the tip of the arm portion is sandwiched between the valve seat and the lock member from the inside and outside in the radial direction . The valve case, the check valve of claim 1, wherein the four arms formed in X character shape is formed in a cage by bending in the same direction. A pair of a working fluid chamber and a pump chamber partitioned by a diaphragm in order from the symmetry axis are arranged in a line-symmetric position inside the pump body,
A suction port communicates with the pump chamber via a suction check valve and a discharge port communicates with the pump chamber via a discharge check valve.
A center rod having both ends connected to the pair of diaphragms is supported through the working fluid chamber so as to be movable in the axial direction around a direction orthogonal to the symmetry axis,
By alternately supplying or discharging the working fluid to and from the pair of working fluid chambers by operating the switching valve, the volumes of the pair of working fluid chambers are alternately increased or decreased, and thus the pair of diaphragms is reduced. In the diaphragm pump that moves and reciprocates the center rod in conjunction with the center rod,
A diaphragm pump according to claim 1 or 2 , wherein the check valve according to claim 1 or 2 is used as the suction check valve and the discharge check valve.

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