JPS6149516B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a diaphragm pump in which a diaphragm disposed in the pump chamber is reciprocated by the driving pressure of the driving fluid to supply a fixed amount of pumping fluid. The present invention relates to an improved replenishment valve device that sequentially replenishes driving fluid from a replenishment source in response to pressure fluctuations.

In conventional replenishment valve devices, when the piston of the diaphragm drive mechanism returns, that is, during the return stroke of the diaphragm, the insufficient driving fluid is replenished according to the negative pressure in the drive chamber. A one-way valve is used, and the valve is generally of the ball valve type with a spring force acting in the closing direction.
In the case of a structure like this, in actual operation, at the early stage of the return stroke of the diaphragm, the negative pressure is already acting on the valve and there is also the influence of vibration of the fluid, so that the diaphragm reaches the bottom dead center region sufficiently. It often occurred that the valve would open before it returned, allowing excessive fluid to flow into the drive guide. As a result, the driving stroke of the diaphragm changes, causing the pump to lose its constant flow, and in some cases, there is a risk that the diaphragm may be destroyed.

In practice, the above-mentioned problem could not be prevented even if the spring force of the valve was accurately determined in design.

In addition, in conventional pump replenishment valve devices, a special space is set up within the pump frame and the device is placed there.
The structure of the frame part becomes complicated, and it is difficult to adjust, maintain, and inspect the device itself, and it is troublesome that the entire component including the pump frame must be removed.

The purpose of the present invention is to always replenish the driving fluid in just the right amount, maintain the quantitative performance of the pump more accurately, prevent damage to the diaphragm, facilitate adjustment, maintenance, and inspection, and improve durability. The object of the present invention is to provide a replenishment valve device for a diaphragm pump that is rich in functionality and excellent in functionality.

To achieve the above object, in the replenishment valve device of the present invention, a cylindrical guide member is fixed to the pump frame by screwing or the like while protruding into the drive chamber, and a movable member is reciprocated on the guide member. A valve chamber is formed in the movable member and houses a one-way valve operable to allow flow only in the inflow direction from the supply source to the drive chamber, and the valve chamber and the drive chamber are connected to each other. A communication means for selectively communicating is provided on the outer periphery of each of the movable member and the guide member, and the movable member is urged in the forward direction by a spring means and the range of motion is restricted between the original position and the movement position. and when the diaphragm is in the bottom dead center region of its drive stroke, the movable member is moved toward the original position against the spring means by contact with the diaphragm to open the communication means to open the one-way operating valve. The drive fluid is supplied through the drive fluid.

With this configuration, the one-way operating valve in the valve chamber is operated by the communication means only in the bottom dead center region of the diaphragm, and the driving fluid is allowed to flow in. Therefore, even if a general mechanical spring is used as a biasing spring for a one-way valve, problems unlike the conventional ones do not occur. In addition, the one-way operating valve is housed within the movable member, and since the movable member and the guide member form a unit, the entire pump can be easily removed from the pump frame for adjustment, maintenance, and inspection. In addition, the structure of the pump frame is simple, and the overall structure can be made more compact.

In particular, in the present invention, the movable member is in contact with or in contact with the diaphragm, and is not fixed to the diaphragm, so there is no need for a mounting structure for the diaphragm, and there is no adverse effect on the shape of the diaphragm. In addition, since the pressure receiving area of the diaphragm is expanded, the operating function is excellent, and the pump is particularly suitable for high pressure type pumps.

Further, in the present invention, only the bottom dead center position of the diaphragm is defined by the movable member, and during the forward stroke, the diaphragm moves further away from the movable member to the top dead center position. Therefore,
The range of movement of the movable member can be kept within a small range, mechanical vibrations can be reduced, and the area of contact with the guide member can be reduced.

Embodiments of the present invention shown in the drawings will be described below.

In FIG. 1, a pump chamber 2 disposed in a diaphragm 1 is provided in a pump head 3, which head is provided with an inlet 4 and an outlet 5 for the pumping fluid. The inlet 4 and the outlet 5 are
A flow path 8 is provided through known valves 6 and 7, respectively.
The flow path 8 communicates with the pump chamber 2. An air vent valve 9 is connected to the opposite side of the pump chamber 2.

A drive chamber 11 that communicates with the opposite side of the pump chamber 2 is formed in the pump frame 10, which is assembled to the pump head in a sealed state with bolts or the like, and the drive chamber 11 is equipped with the supply valve of the present invention. A threaded mounting hole 12 for mounting the device, and a piston-actuated diaphragm drive mechanism 13 shown in FIG.
A communication hole 14 communicating with is provided.

The drive mechanism 13 has a cylinder frame 15 that is assembled to the pump frame 10 with bolts or the like, and a piston 17 that is reciprocably arranged in a cylinder chamber 16 within the frame. It is connected to a reciprocating drive source (not shown). This drive mechanism 13 itself has a known configuration. The drive chamber 11 is filled with incompressible fluid such as oil, and as the piston 17 reciprocates,
The diaphragm 1 reciprocates between the bottom dead center position of the drive stroke shown by the solid line in FIG. 1 and the top dead center position shown by the chain line. Then, by the operation of the diaphragm, the fluid in the pump chamber 2 is fed in constant amounts.

The driving fluid pressure is supplied to the driving chamber 11 through a diaphragm 1.
In order to act on this, a central pressure channel 19 corresponding to the central position of the diaphragm and an auxiliary pressure channel 20 around it are formed.

A cylindrical guide member 21 is screwed into the mounting hole 12 of the pump frame in a sealed manner at one end thereof and fixed in a cantilever manner by a nut 22, the free end protruding into the drive chamber 11. ing. A communication hole 23 is formed along the axial direction at one end of the guide member 21, and the communication hole 23 is connected through a line 25 to a tank 24 as a drive fluid supply source schematically shown in FIG. has been done.
Tank 24 can be installed on pump frame 10.

A movable member 26 is attached to the cylinder hole of the guide member 21 in a reciprocating manner in a sealed state, and its protruding end 26a corresponds to the center portion of the diaphragm 1 so as to be able to abut thereon. The direction of movement of the movable member 26 along the axis is perpendicular to the tensioned surface of the diaphragm 1.

A valve chamber 27 is formed within the movable member 26,
A one-way operating valve 28 constituted by a ball valve is disposed in the valve chamber, and is operable to allow flow only in the inflow direction from the tank 24, which is a supply source, to the drive chamber 11. It is always biased in the closing direction by a spring 29. This valve chamber 27 can communicate with the tank 24 via the communication hole 23.

The inner inner end surface of the movable member 26 faces the radial contact surface 30 forming the inner inner end of the cylinder hole of the guide member 21, and as shown in FIG. 26 can enter into the guide member 21, and in this position (original position), the protruding end 26a of the movable member 26 comes into contact with the diaphragm 1, which is just at the bottom dead center position, and plays the role of positioning it. That is, the opposing surface constitutes a regulating means for regulating the position of the movable member in its original position.

A communication hole 31 is formed in the outer periphery of the movable member 26 and is in constant communication with the valve chamber 27.
A communication hole 32 is also formed along the radial direction in the outer peripheral portion of the drive chamber 1, and the latter communication hole is always in communication with the drive chamber 11. These communication holes 31 and 32 constitute a communication means for selectively communicating the drive chamber 11 and the valve chamber 27.

As can be seen in FIG. 3, the communication hole 31 of the movable member 26 has an annular groove extending over the entire outer circumference of the movable member. Therefore, if both the communication holes 31 and 32 overlap in the axial direction, the movable member and the guide member will communicate with each other even at a relatively rotated position. In other words, the communication means is opened. Note that if a detent is provided to the guide member to prevent the movable member from rotating, the annular groove described above is not necessary. Further, the annular groove may be provided in the communication hole of the guide member.

As will be described later, the communication means opens only when the diaphragm 1 is in the bottom dead center region, that is, only when the movable member 26 is in the vicinity of the original position.

A proximal end of a cylinder 33 is screwed and fixed to the free end of the guide member 21, and the free end has a rib 34 extending into the central pressure passage 19 and integrally bent inward. The outer surface of the rib 34 corresponds to the bottom dead center position of the diaphragm and constitutes a support surface that comes into contact with the diaphragm at that position. rib 3
The inner surface of the movable member 26 faces an annular protrusion 35 formed integrally with the outer peripheral portion of the movable member 26 so as to be able to come into contact with the annular protrusion 35 .
When the movable member 26 is in its original position as shown in FIG. 1, the protrusion 35 is separated from the rib 34, but when it moves in the forward direction (to the right in the figure), it comes into contact with the rib as shown in FIG. and is stopped at this position (movement position). That is, the rib 34 and the protrusion 3
5 constitutes a regulating stage that regulates the position of the movable member 26 in the moving position. The range in which the movable member 26 moves between the two regulating means is small compared to the drive stroke range of the diaphragm, as shown by the chain line in FIG.

A coil spring 36 constituting a spring means is stretched between the protrusion 35 of the movable member and the end face of the guide member 21, and the movable member 26 is constantly urged in the forward direction by the spring. It should be noted that various configurations of the spring means can be considered in addition to the embodiments.

Further, as shown in FIG. 5, the regulating means for determining the movement position of the movable member 26 is the cylindrical body 33 shown in FIG.
In addition to the structure, the pump head 3
A modified configuration in which a part of the can be extended can also be used instead. That is, in the configuration of FIG. 5, the guide member 21 is not provided with a cylinder, but instead a portion 3a of the pump head 3 extends inwardly at the central pressure path 19, and the part 3a on the movable member 26 is It is opposed to the protrusion 35 so as to be able to come into contact with it. Therefore, this contact position is the movable member 2
6 movement position.

In the embodiment of the present invention configured as above,
According to the reciprocating operation of the diaphragm drive mechanism 13,
The diaphragm 1 reciprocates between the bottom dead center position and the top dead center position. As shown in FIG. 2, when the diaphragm 1 moves in the forward direction as indicated by the arrow, the first small range moves together with the movable member 26. This is because the spring 36 biases the movable member in the forward direction. However, once the movable member 26 is stopped at the moving position, only the diaphragm moves to the top dead center position. In the return stroke, the diaphragm 1 abuts the movable member 26 in the latter half of its stroke and is moved to its original position against the spring 36, and the diaphragm also reaches the bottom dead center position, where it is held by the movable member. .
When the diaphragm 1 reaches the bottom dead center region, the communication means is opened, and the driving fluid that is insufficient in the driving chamber 11 is supplied from the tank 24 for one-way operation as shown by the arrow in FIG. It is replenished via valve 28.

In this way, in the present invention, it is possible for the first time to replenish fluid through the one-way operating valve of the replenishment valve device in the bottom dead center region of the diaphragm, thereby eliminating instability in valve operation and constantly Accurate supply adjustments are made. Furthermore, in the present invention, when adjusting, maintaining, or inspecting the device, the pump frame can be removed from the pump head, and then the guide member can be unscrewed from the pump frame to easily remove it as a unit, making the work easier. Facilitated. Furthermore, in the present invention, the movable member restricts only the bottom dead center position of the diaphragm and moves back and forth within a smaller range of motion than the drive stroke of the diaphragm, so there is less vibration during work and less friction. It has excellent durability because there is little damage to the contact parts. Furthermore, since the one-way valve is housed within the movable member, various benefits and effects can be obtained, such as the overall compactness and, in particular, the simplification of the pump frame structure.

In addition, in the present invention, since fluid replenishment is performed accurately, there is no need for a guide wall or other means for defining the top dead center position of the diaphragm. The top dead center position of the diaphragm can be changed accordingly.
It has the advantage that it can be used as a metering pump to meet various specifications with different metering values, and that the structure of the pump chamber can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a diaphragm pump equipped with a replenishment valve device according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the main part of Fig. 1, and Fig. 3 is a -
4 is a sectional view of the diaphragm drive mechanism portion, and FIG. 5 is a partial modification of the embodiment shown in FIG. 1. 1... Diaphragm, 21... Guide member, 26
...Movable member, 28...One-way operating valve, 3
1, 32...Communication hole, 33...Cylinder body.

Claims (1)

[Scope of Claims] 1. A pump head having a pump chamber in which a diaphragm is disposed; a pump frame having a drive chamber for accommodating a diaphragm driving fluid for applying driving pressure for reciprocating drive to the diaphragm; A diaphragm drive mechanism equipped with a piston-actuated diaphragm drive mechanism that supplies pressurized drive fluid to the drive chamber.
In the pump, a cylindrical guide member is fixed to the pump frame while protruding into the drive chamber and has a communication hole at one end communicating with a drive fluid supply source, and the guide member is reciprocatably guided by the guide member. and a one-way operating valve whose one end faces the diaphragm so as to be able to come into contact with the diaphragm and which can be operated to allow flow only in the direction of inflow from the supply source to the drive chamber, and the communication hole of the guide member. a movable member having a valve chamber connected to the supply source through the movable member; and a movable member provided on the outer periphery of each of the guide member and the movable member and capable of opening and closing operation to selectively communicate the drive chamber and the valve chamber. a spring means for biasing the movable member in the forward direction; and a spring means for regulating the movement range of the movable member between an original position corresponding to the bottom dead center of the diaphragm and a movement position moved in the forward direction. When the diaphragm is in the bottom dead center region of its drive stroke, the movable member is moved toward the original position against the spring means by contact with the diaphragm, and the communication means is opened. and a diaphragm replenishment valve device configured to replenish driving fluid through the one-way operating valve. 2. The replenishment valve device according to claim 1, wherein one end is fixed to the guide member, and the other end is provided with a cylindrical body having an inwardly bent rib. 3. The replenishment valve device according to claim 2, wherein the outer surface of the rib is in contact with the diaphragm located at the bottom dead center position. 4. An annular protrusion is integrally provided on the outer periphery of the movable member, and the protrusion cooperates with the rib to constitute a part of the regulating means that regulates the movable member to a moving position. Replenishment valve device according to item 2. 5. A contact surface along the radial direction is formed on the guide member, and the restriction means restricts the movable member to the original position by the contact surface and an end surface formed on the movable member so as to be able to come into contact with the contact surface. A replenishment valve device according to claim 1, which constitutes a part of the replenishment valve device. 6. The replenishment valve device according to claim 1, wherein the spring means is disposed between the movable member and the guide member. 7. The replenishment valve device according to claim 3, wherein the spring means comprises a coil spring wound around the outer periphery of the movable member between the end face of the guide member and the protrusion of the movable member.