JP2011085087A - Reciprocating pump and check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reciprocating pump capable of being made more accurate and miniaturized and a check valve suitable for the reciprocating pump capable of being made more accurate and miniaturized. <P>SOLUTION: This reciprocating pump 1 introduces liquid to an inside of a pump chamber 6 through a suction valve 21 by reciprocating motion of a reciprocating member 61 facing the pump chamber 6 and delivers liquid from the pump chamber 6 through the delivery valve 31. The suction valve 21 and the delivery valve 31 include a body part 25 including a flow path of liquid, a valve seat part 26 provided at an inlet side of the flow path of the body part 25 and having a hole 26a through which the liquid passes formed thereon, a valve element 27 disposed in the body part 25 and capable of opening and closing the hole 26a of the valve seat part 26, and a spring 28 disposed in the body part 25 and pressing the valve element 27 against the hole 26a of the valve seat part 26. A projection 29 projecting in an inner wall direction of the body part 25 is formed at a surface outer circumference part of the spring 28. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention reciprocates a reciprocating member in which a reciprocating member is reciprocated by a driving means to introduce liquid into a pump chamber from a tank or the like via a pipe and a suction valve, and to discharge liquid from the pump chamber via a discharge valve and the pipe. The present invention relates to a pump and a check valve used therefor.

  2. Description of the Related Art Conventionally, a reciprocating pump using a reciprocating motion such as a diaphragm has a check valve equipped with a valve body such as a valve ball capable of opening and closing a liquid flow path in order to prevent a back flow of the liquid being conveyed. It is used as a valve and a discharge valve (Patent Document 1). On the other hand, reciprocating pumps such as electromagnetic pumps are required to have higher accuracy and smaller size. However, miniaturization of the pump inevitably leads to a decrease in the volume change amount of the pump chamber, so how to realize efficient pump operation becomes a problem. In order to improve the efficiency of the pump, it is effective to improve the check characteristics of the suction valve and the discharge valve.

JP 09-203380 A

An object of this invention is to provide the reciprocating pump which can achieve higher precision and size reduction.
Another object of the present invention is to provide a check valve suitable for a reciprocating pump that can achieve higher accuracy and smaller size.

  A reciprocating pump according to the present invention is a reciprocating pump that introduces liquid into a pump chamber through a suction valve and discharges liquid from the pump chamber through a discharge valve by reciprocating movement of a reciprocating member facing the pump chamber. The suction valve and the discharge valve are provided with a main body having a liquid flow path, a valve seat provided on the inlet side of the flow path of the main body, and having a hole through which the liquid passes, A valve body provided in the main body portion and capable of opening and closing the hole of the valve seat portion; and a spring provided in the main body portion and pressing the valve body against the hole of the valve seat portion. Is characterized in that a protrusion protruding in the direction of the inner wall of the main body is formed on the outer periphery of the surface.

  According to the reciprocating pump according to the present invention, by using a spring for the suction valve and the discharge valve, the check property in the suction process and the discharge process can be improved and the efficiency of the pump can be improved. Can be realized.

  In the reciprocating pump according to the present invention, the spring is preferably made of a resin, and can be used without any problem for the transfer of a metal corrosive chemical.

  In the reciprocating pump according to the present invention, the suction valve and the discharge valve are preferably connected in parallel to each other in a state of projecting from the pump head in the central axis direction of the pump head. By connecting the suction valve and the discharge valve in parallel with each other protruding from the pump head, there is no protrusion in the direction perpendicular to the central axis, and the whole is compact and can be mounted on other devices. There is an advantage that the degree of freedom is high.

  The check valve according to the present invention includes a main body having a liquid flow path, a valve seat provided on an inlet side of the flow path of the main body and having a hole through which the liquid passes, and the main body A check valve comprising: a valve body that is provided in a portion and capable of opening and closing the hole of the valve seat portion; and a spring that is provided in the main body portion and presses the valve body against the hole of the valve seat portion. The spring is characterized in that a protrusion protruding in the direction of the inner wall of the main body is formed on the outer peripheral portion of the surface.

  According to the check valve according to the present invention, the sliding resistance with the inner wall of the main body can be reduced by forming the protrusion on the outer peripheral portion of the surface of the spring.

  ADVANTAGE OF THE INVENTION According to this invention, the reciprocating pump which can achieve higher precision and size reduction can be provided. Further, it is possible to provide a check valve suitable for a reciprocating pump capable of achieving higher accuracy and downsizing.

It is a perspective view which shows the reciprocating pump which concerns on one Embodiment of this invention. It is sectional drawing along the AA 'line of FIG. It is a partial expanded sectional view which shows the non-return valve of the reciprocating pump which concerns on this embodiment, and its vicinity. (A) is a top view which shows the spring used for the check valve of the reciprocating pump which concerns on this embodiment, (b) is the spring used for the check valve of the reciprocating pump which concerns on this embodiment. FIG. It is a perspective view which shows the spring used for the non-return valve of the reciprocating pump which concerns on this embodiment.

  Next, a reciprocating pump and a check valve according to an embodiment of the present invention will be described with reference to the drawings. The reciprocating pump according to the present embodiment reciprocates a drive shaft and a diaphragm by electromagnetic driving means, introduces liquid from a tank or the like into a pump chamber through a pipe and a suction valve, and pumps through a discharge valve and a pipe. A diaphragm pump that discharges liquid from the chamber. FIG. 1 is a perspective view showing a diaphragm pump according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. A diaphragm pump 1 according to this embodiment includes a pump head 2 in which a liquid inflow path and an outflow path are formed, and an electromagnetic drive unit 4 that is attached to the back side of the pump head 2 and drives the diaphragm pump 1. ing.

  The pump head 2 is formed with a mounting portion 11 to which the electromagnetic drive unit 4 is attached and a pump head main body 10 in which flow paths 12a and 12b communicating with a pump chamber 15 described later are formed, and the flow of the pump head main body 10. A suction valve unit 20 attached to the front side of the pump head body 10 so as to communicate with the passage 12a, and a suction valve unit 20 on the front side of the pump head body 10 so as to communicate with the flow path 12b of the pump head body 10. A discharge valve unit 30 mounted in parallel is provided. The mounting portion 11 of the pump head body 10 is formed with a recess 13 that forms the pump chamber 6 together with a diaphragm 50 of the electromagnetic drive unit 4 described later.

  The suction valve unit 20 supports the check valve 21 provided so as to communicate with the pump chamber 6 through the flow path 12 a of the pump main body 10, and supports the check valve 21 on the front side of the pump head main body 10. The joint 22 is provided with a joint 22 on which a screw for attachment is formed, and a pipe connection nut 23 attached to the tip of the joint 22. The discharge valve unit 30 is configured in the same manner as the intake valve unit 20, and includes a check valve 31 provided so as to communicate with the pump chamber 6 through the flow path 12 b of the pump body 10, and a check valve 31. A joint 32 that is supported and formed with a screw and a nut 33 for pipe connection are formed. The suction valve unit 20 and the discharge valve unit 30 are attached to the front side of the pump head 10 via O-rings 24 and 34, respectively.

  FIG. 3 is a partially enlarged cross-sectional view showing the check valves 21 and 31 of the diaphragm pump 1 according to this embodiment and the vicinity thereof. Here, since the check valve 31 has the same configuration as the check valve 21, description thereof is omitted, and only the check valve 21 will be described. The check valve 21 includes a main body portion 25 having a flow path for flowing liquid, a valve seat portion 26 provided on the inlet side of the flow path of the main body portion 25 and having a hole 26a through which liquid passes, and a valve seat. A spherical valve body 27 having a size capable of closing the hole 26a of the portion 26, and a spring 28 that presses the valve body 27 against the valve seat portion 26 to ensure a predetermined back pressure. The main body portion 25 and the valve seat portion 26 form a cylindrical space in which the valve body 27 can slightly move, and the valve body 27 and the spring 28 are accommodated in the cylindrical space. In the main body portion 25, a restricting portion 25a protruding inward from the outlet side of the flow path is formed in order to restrict excessive movement of the valve element 27 in the cylindrical space.

  FIG. 4 is a plan view and a front view showing a spring 28 used in the check valve 21 of the diaphragm pump 1 according to the present embodiment, and FIG. 5 is a perspective view showing the spring 28. The spring 28 of the check valve 21 is composed of an annular upper end 28a and lower end 28b, and a helical connecting portion 28c that connects the upper end 28a and the lower end 28b, and these are suitable as spring materials. Are integrally formed. As a resin suitable for the spring 28, for example, PEEK (polyether ether ketone), PC (polycarbonate), POM (polyacetal) and the like can be used. As shown in FIGS. 4 (a) and 4 (b), a plurality of protrusions 29 projecting outward from the surface are provided at the upper end portion 28a and the lower end portion 28b of the spring 28 at intervals of about 45 degrees on the outer peripheral surface. Is formed. As shown in FIGS. 4B and 5, a plurality of protrusions 29 projecting outward from the surface are formed on the coupling portion 28 c of the spring 28 on the spiral outer peripheral surface with an interval of about 180 degrees. Has been. The spring 28 formed in this way is formed by the main body portion 25 and the valve seat portion 26 so that the protrusions 29 formed on the upper end portion 28a, the lower end portion 28b, and the connecting portion 28c are in contact with the inner wall of the main body portion 25 at points. It is accommodated in the formed cylindrical space.

  As shown in FIG. 1, the electromagnetic drive unit 4 includes a cylindrical frame 40, a fixed unit 50 fixed to the frame 40, a movable unit 60 movable with respect to the fixed unit 50, and the movable unit 60 being magnetized. An electromagnetic coil 70 driven by force and a diaphragm 80 mounted on the front surface 40a of the frame 40 are provided. The electromagnetic drive unit 4 is connected to a power source (not shown) and a control device (not shown) via a connector 7 and a conducting wire 8.

  The diaphragm 80 has flexibility, and when the pump head main body 10 is attached to the front surface 40 a of the frame 40 via the attachment portion 11, the peripheral portion thereof is the front surface 40 a of the frame 40 and the pump head main body 10. The front surface of the pump head body 10 together with the recess 13 of the pump head body 10 forms the pump chamber 6. In addition, the diaphragm 80 is coupled to a tip end portion of a rod-shaped plunger 61 constituting the movable portion 60 via a diaphragm coupling body 62. The plunger 61 is supported by a center hole of a fixed sleeve 51 constituting the fixed portion 50 through an axial bearing 52 so as to be movable in the axial direction. A plunger core 63 is fixed to the rear end of the plunger 61. The plunger core 63 is supported by the fixed portion 50 via an axial bearing 53 so as to be movable in the axial direction. The front surface of the plunger core 63 is opposed to the rear end surface of the fixed sleeve 51 with a predetermined gap. A return spring 64 is provided between the inner peripheral surface of the fixed sleeve 51 and the outer peripheral surface of the plunger 61. The return spring 64 is mounted between the front surface of the plunger core 63 and the fixed sleeve 51, so that the plunger 61 is always urged rearward via the plunger core 63. An O-ring (not shown) for absorbing shock is attached to the front surface of the plunger core 63. The movable portion 60 is configured by the plunger 61, the diaphragm connector 62, the plunger core 63, the return spring 64, and the O-ring.

  The fixing portion 50 includes a fixing sleeve 51 that supports the plunger 61 and a coil holder 54 that is provided so as to surround the fixing sleeve 51 and the plunger core 63. An electromagnetic coil 70 is attached to the coil holder 54.

  Next, operation | movement of the diaphragm pump 1 comprised in this way is demonstrated. First, the electromagnetic drive unit 4 is energized by operating a power source and a control device (not shown). When the electromagnetic coil 70 of the electromagnetic drive unit 4 is energized, the plunger core 63 moves forward by electromagnetic force, and when the energization of the electromagnetic coil 70 is stopped, the plunger 61 moves backward by the spring force of the return spring 64. At this time, the frequency of the reciprocating operation of the plunger 61 is controlled by controlling the energization frequency of the electromagnetic coil 70 by the control device.

  In the suction stroke in which the diaphragm 80 moves backward together with the plunger 61, the inside of the pump chamber 6 is in a negative pressure state, so that the check valve 21 of the suction valve unit 20 is opened and the check valve 31 of the discharge valve unit 30 is closed. The liquid flows into the pump chamber 6 through the joint 22, the check valve 21, and the flow path 12 a of the pump head body 10 from the tank that does not. Next, in the discharge stroke in which the diaphragm 80 moves forward together with the plunger 61, the hydraulic pressure in the flow path 12b of the pump chamber 6 and the pump head body 10 becomes larger than the back pressure applied by the spring 28 of the check valve 31. Therefore, the check valve 21 of the intake valve unit 20 is closed and the check valve 31 of the discharge valve unit 30 is opened, so that the liquid in the pump chamber 6 flows into the flow path 12b of the pump head body 10, the check valve 31 and the joint 32. And discharged to a discharge hose (not shown). Here, the check valves 21 and 31 are opened and closed by the expansion and contraction of the spring 28 via the valve element 27 by the hydraulic pressure or the spring force of the spring 28, and the hole 26a of the valve seat portion 26 being released or closed. Done.

According to the diaphragm pump according to the present embodiment described above, since the springs 28 are used for the check valves 21 and 31, the checkability in the suction process and the discharge process is improved, and the pump efficiency can be improved. The pump can be downsized. In addition, the spring 28 is made of resin and can be used without problem for the transfer of a metal corrosive chemical.
Further, when a check valve is used for the intake valve unit 20 and the discharge valve unit 30 and the spring 28 is made of resin, there is a possibility that the check property deteriorates due to the sliding resistance due to the reciprocating motion and the problem of wear occurs. However, according to the diaphragm pump according to the present embodiment, since the protrusion 29 is formed on the outer periphery of the spring 28, the sliding resistance can be reduced.

  In the present embodiment, the suction valve unit 20 and the discharge valve unit 30 are provided on the front surface of the pump head 2 so as to be parallel to the central axis direction of the pump head 2 and the electromagnetic drive unit 4 disposed coaxially therewith. And when the external shape of the pump head 2 and the electromagnetic drive part 4 is extended in those axial directions, it is settled in the range of the extended external shape. For this reason, there is no protrusion in the direction orthogonal to the central axis, the whole is compact, and there is an advantage that the degree of freedom of attachment to other devices is increased.

  In the reciprocating pump according to the present embodiment, the reciprocating pump is a diaphragm pump, but is not limited thereto, and may be a reciprocating pump such as a bellows pump or a tube diaphragm pump.

DESCRIPTION OF SYMBOLS 1 Diaphragm pump, 2 Pump head, 4 Electromagnetic drive part, 6 Pump chamber, 10 Pump head main body, 20 Suction valve unit, 21 Check valve, 25 Main body part, 26 Valve seat part, 27 Valve body, 28 Spring, 29 Protrusion , 30 Discharge valve unit, 31 Check valve, 80 Diaphragm

Claims (4)

A reciprocating pump that introduces liquid into the pump chamber through a suction valve by a reciprocating motion of a reciprocating member facing the pump chamber and discharges the liquid from the pump chamber through a discharge valve;
The suction valve and the discharge valve include a main body having a liquid flow path, a valve seat provided on an inlet side of the flow path of the main body, and having a hole through which the liquid passes, and the main body A valve body capable of opening and closing the hole of the valve seat portion, and a spring provided in the main body portion and pressing the valve body against the hole of the valve seat portion,
2. A reciprocating pump according to claim 1, wherein a protrusion is formed on the outer peripheral surface of the spring so as to protrude toward the inner wall of the main body.   The reciprocating pump according to claim 1, wherein the spring is made of resin.   The reciprocating pump according to claim 1 or 2, wherein the suction valve and the discharge valve are connected in parallel with each other in a state of protruding from the pump head in a central axis direction of the pump head. A main body portion having a liquid flow path, a valve seat section provided on the inlet side of the flow path of the main body section and having a hole through which the liquid passes, and provided in the main body section, the valve seat section A check valve comprising: a valve body capable of opening and closing the hole; and a spring provided in the main body portion and pressing the valve body against the hole of the valve seat portion,
The check valve is characterized in that a protrusion is formed on the outer peripheral surface of the spring so as to protrude toward the inner wall of the main body.

Images