JP4204562B2 - Reciprocating pump - Google Patents

Description

  The present invention relates to a reciprocating pump, and more particularly to a reciprocating pump provided with a safety valve.

  Conventionally, it is generally known that a reciprocating pump conveys fluid by sucking and discharging fluid into a pump chamber. Such a reciprocating pump repeats an increase and a decrease in pressure due to continuous suction and discharge, but when the balance between suction and discharge is out of order for some reason, such as abnormal discharge In some cases, the pressure in the pump chamber (hereinafter referred to as “internal pressure”) rises and eventually exceeds the allowable range of the reciprocating pump, and the reciprocating pump may be damaged.

  In order to prevent such inconvenience, there is a reciprocating pump provided with a safety valve. Such a safety valve normally closes the pump chamber, but when the internal pressure reaches a predetermined pressure, the valve body is pushed open by the internal pressure to release the internal fluid, thereby suppressing an increase in the internal pressure. To function.

  However, the safety valve is intended to function only when the internal pressure rises abnormally (that is, during abnormal pressure) and is not intended to perform any function until normal time. The current situation is not being utilized. On the other hand, in order to provide a safety valve, the reciprocating pump needs to have a structure corresponding to the safety valve. The structure on the side is not utilized effectively.

  Accordingly, an object of the present invention is to provide a reciprocating pump that can effectively use a safety valve even in a normal time while having a function inherent to the safety valve.

The reciprocating pump according to the present invention is provided with a safety valve for the pump chamber formed between the suction side and discharge side check valves , and the safety valve closes the pump chamber and the inside becomes a predetermined pressure. a state in which the pump chamber is opened, a reciprocating pump state and Ru is capable of changing the to release the blockage of the pump chamber, comprising a flow path pump chamber communicating with upon opening of the safety valve, the flow the road, characterized in that releasable low pressure check valve is al provided a check state by the pressure lower than the check valve on the discharge side.

  According to the reciprocating pump having the above-described configuration, when the safety valve is in a closed state in which the pump chamber is closed, the safety valve performs the original function of opening the safety valve when the internal pressure rises abnormally. In the non-blocking state where the blockage of the chamber is released, the pump chamber can communicate with the outside. Therefore, the fluid can be directly taken out from the inside of the pump chamber sandwiched between the check valves as necessary.

  By the way, as described above, the reciprocating pump conveys fluid by alternately applying positive pressure and negative pressure to the pump chamber. However, when gas exists in the pump chamber, the applied pressure is Is a phenomenon in which a gas having a higher contraction rate than liquid is absorbed and expanded by the gas, and pressure cannot be applied to the check valves on the suction side and the discharge side, thereby obstructing the transport of the liquid. (Generally called “gas lock”) occurs.

  These problems may occur when gas is sucked into the pump chamber while the reciprocating pump is being driven, and particularly when the use of the reciprocating pump is started while the pump chamber is not yet filled with liquid. In addition, it is likely to occur when the driving of the reciprocating pump is stopped with the liquid remaining in the pump chamber and the use is resumed after a part of the liquid in the pump chamber becomes gas.

Therefore, in this case, in order to release the gas lock, a flow path communicating with the pump chamber is provided when the safety valve is opened, and the check state is released by a pressure lower than that of the check valve on the discharge side. A configuration is provided in which a possible low pressure check valve is provided .

  In other words, when the safety valve is released from the closed state, the pump chamber and the flow path connected to the pump chamber are defined by the check valve and the low pressure check valve on the suction side, thereby forming a new pump mechanism. In this case, the low pressure check valve can be released from the check state with a lower pressure than the check valve on the discharge side. Therefore, when a positive pressure is applied, the pressure is not completely absorbed by the gas. The check state of the low pressure check valve is released, and gas (actually, not only gas but also liquid can be contained) is pushed out from the open portion communicating with the outside as the volume in the pump chamber decreases. By repeating these series of operations, gas is sequentially pushed out from the pump chamber, and the gas lock can be easily eliminated.

  Further, as a safety valve capable of changing between the closed state and the non-closed state, the safety valve includes a valve body that contacts the valve seat, a biasing means that biases the valve body toward the valve seat, and the biasing valve. A base member that is disposed between the base member and the valve body, and an operation unit that is displaceable relative to the base member. It is possible to adopt a configuration in which the urging force of the urging means is changed between a state where the urging force acts on the valve seat via the valve body and a state where the urging force does not act.

  In this way, when the urging force of the urging means is applied to the valve seat via the valve body, it can be in the closed state, and when the urging force is not applied to the valve seat, it can be in the non-closed state. can do.

  More specifically, it is preferable that a cam mechanism configured to apply a force so that the operating means and the base face each other as the operating means and the base come into sliding contact with each other is preferable. If it does in this way, the state of a safety valve can be changed easily by using a cam mechanism.

  As described above, according to the reciprocating pump according to the present invention, the safety valve can be further effectively utilized while the function inherent to the safety valve is exhibited.

  Hereinafter, embodiments of a reciprocating pump according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the reciprocating pump according to the present embodiment includes a pump head 1 provided with a safety valve 50 and a drive source 100 to which the pump head 1 is attached and generates a reciprocating motion. Such a reciprocating pump is configured to convey a fluid by reciprocating a diaphragm (diaphragm) that separates the pump chamber formed in the pump head 1 from the drive source 100.

  The pump head 1 is a device that conveys fluid from below to above. As shown in FIG. 2, the pump head 1 is provided in a head body 10 having a structure in which the fluid circulates inside, and at the upper and lower portions of the head body 10. And a pair of joints (suction side joint and discharge side joint) 20 and 30 having a check mechanism.

  A pair of holes 11 and 12 through which fluid flows in or out are formed in the upper end and lower end of the head body 10 so as to correspond to the pair of joints 20 and 30. Further, as shown in FIG. 3, a recess 13 is formed on the side surface of the head body 10, and at least a part of the path from one of the pair of holes 11 and 12 to the other has the recess 13. Configured to go through. The recess 13 is closed by a diaphragm 40, and the path when closed by the diaphragm 40 becomes a transfer path 14 for transferring a fluid.

  The head body 10 is further formed with a branch path 15 that branches off from the transport path 14 and extends outward. The branch path 15 is provided with a safety valve 50 and is normally blocked by the safety valve 50. Specifically, the safety valve 50 is disposed in an intermediate portion of the branch path 15, and thereby the branch path 15 is divided into two regions. More specifically, the branch path 15 includes a safety valve chamber 16 that houses the safety valve 50 and a pair of flow paths 17 and 18 that communicate with each other via the safety valve chamber 16, and the pair of flow paths 17 and 18. One of them communicates with the conveyance path 14 is the first flow path 17, and the other communicates with the outside is the second flow path 18.

  In addition, the area | region comprised with the said 1st flow path 17 of the said conveyance path 14 and the branch path 15 becomes the pump chamber P in which a fluid exists normally.

  Specifically, the safety valve chamber 16 is configured by a valve body housing portion 16A in which the valve body of the safety valve 50 is housed, and an attachment portion 16B for attaching the safety valve 50 to the head body 10, and the first flow path 17 and the first flow passage 16 are arranged. The two flow paths 18 communicate with each other via the valve body accommodating portion 16A. Further, the wall surface of the valve body accommodating portion 16A serves as a valve seat 16C with which the valve body of the safety valve 50 abuts. More specifically, the valve body accommodating portion 16A includes a tapered space whose diameter gradually increases with the end portion of the first flow path 17 as a bottom, and a cylindrical space having the same diameter continuous with the space. Composed. The attachment portion 16B is a space opened to the outside so that the safety valve 50 can be attached from the outside of the head body 10.

  The second flow path 18 communicates with the outside as described above, but its base end is provided in the safety valve chamber 16. Specifically, the base end portion of the second flow path 18 is located on the valve seat 16C, and more specifically, located on the wall surface of the tapered space. The second flow path 18 is a multi-stage space whose diameter gradually increases from the base end to the other end, and the vicinity of the opening of the other end can be attached to a desired member arbitrarily. It is part 18A.

  The joints 20 and 30 are members for connecting the head body 10 and the supply side pipe or the reception side pipe. The suction side joint 20 is attached to the lower part of the head body 10 and the discharge side joint 30 is provided to the upper part. It is attached. Each joint 20, 30 is provided with a check valve 21, 31. Specifically, a valve chamber communicating with the outside in the vertical direction is formed inside the check valves 21 and 31, and the check ball 21A as a valve body movable in the vertical direction is formed in the valve chamber. , 31A are accommodated, and a valve seat on which the check balls 21A, 31A are seated is formed at the lower end. While the check balls 21A and 31A are in close contact with the valve seat when seated, there is a gap when positioned above the valve seat.

  The diaphragm 40 is provided on the drive source 100 side, and the recess 13 is closed by mounting the pump head 1 to the drive source 100.

  Next, the safety valve 50 attached to the head body 10 will be described with reference to FIG.

  The safety valve 50 includes a valve body 51 that contacts the valve seat 16C of the safety valve chamber 16, an urging means 52 for urging the valve body 51 in the distal direction (forward), and the urging means 52 therebetween. A base 53 arranged and opposed to the valve body 51 and an operation means 54 for relatively displacing the valve body 51 and the base 53 are configured. The safety valve 50 is normally disposed so as to press the valve body 51 against the valve seat 16C, and the pressing force (that is, the urging force by the urging means 52 acting on the valve seat 16C via the valve body 51). ) Is set to a predetermined pressure value with the allowable pressure set for the reciprocating pump as a limit.

  The safety valve 50 includes a shaft body 55 that holds the members. The shaft body 55 holds the valve body 51 on one end side, and holds the operating means 54 on the other end side. Between the urging means 52 and the base 53 facing the urging means 52 therebetween, keeping. Specifically, the shaft body 55 has a cylindrical shape, the valve body 51 and the operating means 54 are fixed to the shaft body 55, and the base 53 is rotatably supported.

  The valve body 51 is a member having a structure capable of closely contacting the valve seat 16C. Specifically, the valve body 51 includes a tapered portion 51A having a diameter that decreases toward the distal end side, and a columnar portion 51B that is continuous with the tapered portion. The valve body 51 is crowned with an O-ring 56 so as to closely contact the valve seat 16C. This prevents fluid from leaking from the pump chamber P side to the safety valve chamber 16 side.

  By the way, as described above, the base end portion of the second flow path 18 is located in the valve seat 16C with which the valve body 51 abuts. Therefore, it is desirable for the O-ring 56 to prevent leakage from the pump chamber P side to the rear of the valve body 51 and to prevent leakage to the second flow path 18. Specifically, two types of O-rings 56 are used so that the O-ring 56 is positioned on both sides of the proximal end portion of the second flow path 18 when the valve body 51 contacts the valve seat 16C.

  That is, the front O-ring (front O-ring) 56A is provided in the tapered portion 51A to prevent leakage mainly from the pump chamber P side to the second flow path 18. On the other hand, the O-ring (rear O-ring) 56B on the rear side is provided in the columnar portion 51B and mainly prevents leakage from the pump chamber P side to the rear of the valve body 51. Thereby, it is possible to prevent the fluid from inadvertently leaking and to prevent the biasing means 52 from being corroded by the fluid in the rear O-ring 56B.

  The biasing means 52 is a coil spring and is mounted on the shaft body 55. Further, by being sandwiched between the valve body 51 and the base 53, it is compressed and generates a biasing force. The pressing force of the safety valve 50 can be adjusted by appropriately changing the urging means. In order to generate a relatively large pressing force required for the safety valve 50, the coil spring is preferably made of a metal such as stainless steel.

  The base 53 receives one end of the urging means 52 on the front side and abuts on the operation means 54 on the rear side. The base 53 can be attached to the attachment portion 16B of the safety valve chamber 16, and also functions as a member for fixing the safety valve 50 to the head body 10 side. Specifically, a male screw is provided on the outer periphery of the base 53, and the base 53 is screwed to a female screw provided on the wall surface of the mounting portion 16B. In addition, the base 53 can rotate with respect to the shaft body 55 and can slide at the same time. When the valve body 51 and the urging means 52 are accommodated in the safety valve chamber 16 and the base 53 is attached, the urging means 52 is compressed and urges the valve body 51 forward to have a function as a normal safety valve. It becomes a state.

  The operation means 54 is a member provided at the rear portion of the safety valve 50 and is fixed to the shaft body 55. Therefore, when the valve body 51 is urged in the distal direction by the urging means 52, the operation means 54 is also urged in the same direction via the shaft body 55. At this time, the operating means 54 is in pressure contact with the base 53. Since the valve body 51 is fixed to one end portion of the shaft body 55 as described above, the valve body 51 is displaced via the shaft body 55 when the operation means 54 is operated. Note that the operation means 54 may be manually operated or mechanically operated.

  The mechanism for moving the valve body 51 by the operation means 54 is specifically a cam mechanism formed in a facing area between the base 53 and the operation means 54. As shown in FIG. 5, the cam mechanism includes a portion 53A on the base 53 side and a portion 54A on the operating means 54 side, and at least one portion has a shape that is gently displaced. Further, friction is generated between the two portions 53A and 54A.

  More specifically, the operation means 54 is a grip body that is rotated around the axis of the shaft body 55. The cam mechanism is configured to function as the operating means 54 rotates. That is, the portion 53A on the base 53 side includes two flat portions 53B and 53D that are perpendicular to the facing direction of the base 53 and the operation means 54 and have different heights, and an inclined portion that gently connects the flat portions 53B and 53D. 53C, and these flat portions 53B and 53D and the inclined portion 53C are arranged around the axis. The flat portions 53B and 53D receive the urging force by the urging means 52 acting from the portion 54A on the operation means 54 side perpendicularly to the surface. Further, the portion 54A on the operation means 54 side has the same shape as the portion 53A on the base 53 side, and includes two flat portions 54B and 54D and an inclined portion 54C.

  Therefore, when the flat portions of both the portions 53A and 54A come into contact with each other, both the members 53 and 54 can be positioned in a close state or a separated state, and when the inclined surfaces 53C and 54C come into contact with each other. Can also be positioned by friction, that is, it can be positioned at any position.

  Next, the low pressure check valve 60 used when removing gas from the pump chamber P will be described with reference to FIG.

  The low pressure check valve 60 is interposed in the middle part of the second flow path 18. The second flow path 18 is a space serving as a valve chamber (second valve chamber) when the low pressure check valve 60 is mounted on a reciprocating pump. Specifically, any one of the steps formed in the second flow path 18 becomes the valve seat portion 18B for the low pressure check valve 60. Hereinafter, when the second flow path 18 is described as a second valve chamber that houses the low pressure check valve 60, the second valve chamber is also denoted by the same reference numeral 18 as the second flow path.

  The low pressure check valve 60 includes a valve body 61 that contacts the valve seat portion 18B of the second valve chamber 18, a biasing body 62 for biasing the valve body 61 in the distal direction, and the biasing body 62. And an adapter 63 for receiving it.

  The low pressure check valve 60 presses the valve body 61 against the valve seat portion 18B, but the pressing force (that is, the biasing force by the biasing means 62 acting on the valve seat 18B via the valve body 61) is. The pressure is significantly lower than the pressure required to open the discharge-side check valve 31. Specifically, the pressure is set to a pressure balanced with a pressure (for example, 1.2 atmospheres) slightly higher than the atmospheric pressure (1 atmosphere). Moreover, the low pressure check valve 60 has a structure in which the fluid can flow inside so that the second valve chamber 18 also functions as a flow path through which the fluid flows.

  The valve body 61 is in contact with the valve seat portion 18B and closes the flow path in front of the valve body 61B. On the proximal end portion of the valve body 61 that does not contact the valve seat portion 18B, A hole is formed so that can be circulated.

  The urging body 62 is a coil spring and is supported on the wall surface of the second valve chamber 18. Further, in the low pressure check valve 60, the valve body 61 and the urging body 62 are formed as one body. Note that fluid can flow through the axial center of the coil spring. For this reason, as a material, what has the corrosion resistance with respect to chemicals, such as a fluorine-type resin, is preferable.

  The adapter 63 is a member for attaching the low pressure check valve 60 to the head body 10. Specifically, a male screw is provided on the outer periphery, and the screw is fixed to the head body by being screwed to a female screw formed on the wall surface of the mounting portion 18A of the second valve chamber 18. In addition, a hole is formed at the center of the adapter 63 in the axial direction, and fluid can flow therethrough. Further, an O-ring is mounted so that it can be closely attached to the wall surface of the second valve chamber 18. Furthermore, a pipe can be connected to the adapter 63.

  Next, the operation of the reciprocating pump having the above configuration will be described.

  First, when the diaphragm 40 is moved in the direction of arrow A (see FIG. 3) via the piston 101, the volume of the pump chamber P closed by the diaphragm 40 increases, and a negative pressure is generated in the pump chamber P. At this time, the negative pressure acts on the check valves 21 and 31 on the suction side and the discharge side. Specifically, the suction-side check ball 21A is lifted upward, while the discharge-side check ball 31A is attracted downward. Then, the fluid flows into the pump chamber P through the gap between the suction side check ball 21 </ b> A and the valve seat.

  Next, when the diaphragm is moved in the direction opposite to the arrow A, the volume of the pump chamber P decreases and a positive pressure is generated in the pump chamber P. At this time, the suction side check ball 21A is pressed against the valve seat, while the discharge side check ball 31A is pushed upward. Then, the fluid flows out of the pump chamber P from the gap between the discharge-side check ball 31A and the valve seat.

  By repeating the above inflow and outflow processes, the fluid is conveyed from the supply side pipe to the reception side pipe every stroke. By the way, by repeating these two steps, the internal pressure is repeatedly increased and decreased. However, if the inflow amount and the outflow amount are constant, the average pressure is kept constant. However, for example, when the discharge side piping is clogged, even if positive pressure is applied to the pump chamber P, the discharge side check ball 31A is not normally pushed up by the pressure from the receiving side piping side, and the fluid does not flow out. When negative pressure is applied to the pump chamber P, the suction side check ball 21A is lifted and fluid flows in, and as a result, the internal pressure continues to rise.

  Here, the safety valve 50 attached to the pump head 1 closes the first flow path 17, and when the internal pressure exceeds the pressing force of the safety valve, the valve body 51 is energized. The pump chamber P is opened by being pushed in the direction opposite to the direction. As a result, the fluid in the pump chamber P flows out from the gap S between the valve body 51 and the valve seat 16C to the second flow path 18 to prevent the reciprocating pump from being damaged.

  By the way, the safety valve 50 according to the present embodiment normally has the valve body 51 in contact with the valve seat 16C as shown in FIG. 7 (a), and exhibits the function as a normal safety valve as described above. However, at the same time, when it is desired to take out the fluid from the inside of the pump chamber P, the non-blocking state in which the blockage of the pump chamber P is always released as shown in FIG. It is also possible.

  Specifically, the gripping body as the operation means 54 is rotated. Then, the operating means 54 moves backward along the cam mechanism while sliding with the base 53, and accordingly, the valve body 51 is separated from the valve seat 16 </ b> C according to the shaft body 55. In this case, the operation means 54 displaces the valve body 51 against the urging force of the urging means 52, but the rotation of the operation means 54 is converted into a force that opposes the urging force by the cam mechanism. Therefore, the valve body 51 can be easily separated from the valve seat 16C.

  Incidentally, as described above, since the operation means 54 can be positioned at an arbitrary position, the safety valve 50 is stably maintained in an opened state. At this time, the pump chamber P communicates with the outside via the gap S and the second flow path 18.

  Thereby, for example, the fluid can be taken out for sampling or the fluid in the supply side piping can be discharged for liquid change.

  Furthermore, when the low pressure check valve 60 is provided in the second flow path 18, it is possible to remove the gas present in the pump chamber P. The operation will be described below.

  First, in the same manner as described above, the operation means 54 is operated to make it a non-blocking state. Here, the fluid (in this case, gas is included) is a region defined by the suction-side check valve 21 and the low-pressure check valve 60 (that is, the gap S and the second in the pump chamber P). A region in which a space in front of the valve body 61 of the flow path 18 is added is filled. Therefore, the fluid exists between the pair of check valves 21 and 60, and an area defined by the pair of check valves 21 and 60 is a new pump chamber (hereinafter, referred to as a new pump mechanism). P ′) (referred to as “second pump chamber”).

  Next, the diaphragm 40 is reciprocated to apply pressure to the second pump chamber P ′. Then, since the pressing force against the valve seat portion 18B of the low pressure check valve 60 is set to a pressure lower than the pressure required to release the check state of the check valve 31 on the discharge side, a positive pressure is set. When applied, the gas in the fluid contracts and acts on the valve body 61 without absorbing all of the positive pressure, the check state of the low pressure check valve 60 is released, and the fluid is released.

  When the above steps are repeated and most of the gas is released out of the system and eventually the liquid mainly flows out, it is considered that the removal of the gas is completed, and the operation means 54 is operated to close the safety valve 50. Return to the state. In this case, even if a small amount of gas still remains in the pump chamber P, the pressure is no longer absorbed, so that by adding positive pressure and negative pressure as usual, further gas can be obtained. Can be returned from the pump chamber P to the normal state.

  As described above, the safety valve 50 according to the present embodiment can effectively utilize the safety valve 50 even in a normal time while exhibiting the original function as a safety valve that opens at the time of abnormal pressure. Further, in the case of a reciprocating pump provided with such a safety valve 50, the structure necessary for the reciprocating pump when the safety valve is provided (for example, the branch path 15) is also effectively used for sampling of the fluid. be able to.

  Further, if the reciprocating pump is further provided with the low pressure check valve 60, the gas present in the pump chamber P or P 'can be easily removed to eliminate the gas lock.

  The safety valve according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, as the operation means 54 of the safety valve 50, a gripping body constituting a cam mechanism with the base 53 has been described as an example. However, the present invention is not limited to such a configuration, and as shown in FIG. May be a gripping body having a protrusion 154A that can be inserted into the recess 153A of the base 153. In this case, in the closed state, the protrusion 154A is accommodated in the recess 153A, and the urging force of the urging means 152 acts on the valve seat 16C via the valve body 151, and the operating means 154 is retracted from this state. Thus, the protrusion 154A is positioned so as to contact the base 153 at a position that does not coincide with the recess 153A, thereby changing to a non-blocking state in which no urging force is applied.

  The safety valve 50 has been described on the assumption that the base 53 is attached to the head main body 10 and the operation means 54 is displaced. However, the operation means may be provided on the head main body 10 side and the base may be displaced.

  Specifically, as shown in FIG. 9, the safety valve includes a valve body 251 that contacts the valve seat, an urging means 252 that urges the valve body 251 toward the valve seat, and the urging means 252. A base 253 disposed between and facing the valve body 251 and an operating means 254 that is displaceable relative to the base 253. The base 253 is slidable in the front-rear direction on the head body. The operating means 254 is held by the head body so as to be slidable in a direction perpendicular to the operating means 254 and in a retaining state. The base 253 is formed with an inclined surface 253A in a region facing the operation means 254, and when the operation means 254 is slid along the inclined surface 253A of the base 253, a force acts so as to come in contact with and away from each other. Let

  In this case, as shown in FIG. 9 (a), when the operating means 254 is on one side of the inclined surface 253A, the position where the biasing means 252 can be compressed, that is, the valve body 251 and the base 253 are biased. The base body 253 is disposed at a position closer to the free length of the means 252. On the other hand, as shown in FIG. 9B, when the operating means 254 is on the other side, the urging means 252 is not compressed, and the urging means 252 is not compressed between the valve body 251 and the base 253. The base body 253 is disposed at a position existing in FIG. In this way, it is not always necessary to connect the valve body 251 and the base body 253 by the shaft body, and the structure can be simplified by reducing the number of parts.

  Furthermore, although the O-ring 56 provided on the valve body 51 has been described as using two types of O-rings 56A and 56B so as to be positioned forward and backward across the base end portion of the second flow path, this configuration is used. It is not limited, for example, as long as it can block the leakage of fluid from the pump chamber P side to the second flow path 18 and prevent the second flow path 18 from leaking backward, for example, It may be composed of only one type provided at a position where the base end of the second flow path is closed.

  Further, the safety valve 50 has been described as being separate from the head main body 10 and attached to the head main body 10 by the base 53, but is not limited thereto, and is formed integrally with the head main body 10. It may be. The same applies to the low pressure check valve 60.

The perspective view of the reciprocating pump which concerns on embodiment of this invention is shown. The front sectional view of the pump head of the reciprocating pump according to the embodiment is shown. The side sectional view of the pump head of the reciprocating pump according to the embodiment is shown. Sectional drawing of the safety valve of the reciprocating pump which concerns on the embodiment is shown. The disassembled perspective view of the cam mechanism provided in the safety valve of the reciprocating pump which concerns on the embodiment is shown. Sectional drawing of the low pressure check valve of the reciprocating pump which concerns on the same embodiment is shown. It is front sectional drawing of the pump head of the reciprocating pump which concerns on the same embodiment, Comprising: (a) shows the obstruction | occlusion state of a safety valve, (b) shows a non-occlusion state. Sectional drawing of the safety valve of the reciprocating pump which concerns on other embodiment of this invention is shown. It is sectional drawing of the safety valve of the reciprocating pump which concerns on other embodiment of this invention, Comprising: (a) shows the obstruction | occlusion state of a safety valve, (b) shows a non-occlusion state.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Pump head, 10 ... Head main body, 13 ... Recessed part, 14 ... Conveyance path, 15 ... Branching path, 16 ... Safety valve chamber, 16A ... Valve body accommodating part, 16B ... Mounting part, 16C ... Valve seat, 17 ... First flow 18: second flow path, 18A: mounting portion, 18B: valve seat portion, 20: suction side joint, 21 ... check valve on the suction side, 21A ... check ball, 30 ... discharge side joint, 31 ... discharge side Check valve, 31A ... check ball, 40 ... diaphragm, 50 ... safety valve, 51 ... valve, 51A ... tapered portion, 51B ... cylindrical portion, 52 ... biasing means, 53 ... base, 54 ... operating means, 55 ... Shaft body, 56 ... Ring, 56B ... Back ring, 56A ... Front ring, 60 ... Low pressure check valve, 61 ... Valve body, 62 ... Energizing body, 63 ... Adapter, 100 ... Drive source, 101 ... Piston, 151 ... Valve body, 152 ... Biasing means, 153 ... Body, 153A ... depression, 154 ... operation means, 154A ... projection, 251 ... valve body, 252 ... biasing means, 253 ... base, 253 ... A inclined surface, 254 ... operation means, P ... pump chamber, P '... Second pump chamber, S ... Gap

Claims (3)

A safety valve is provided for the pump chamber formed between the suction side and discharge side check valves , and the safety valve closes the pump chamber and opens the pump chamber when the inside reaches a predetermined pressure. , a reciprocating pump that will be capable of changing the state to release the blockage of the pump chamber,
Comprising a flow path communicating with the pump chamber when the safety valve is opened;
The flow path, reciprocating pump, characterized in that releasable low pressure check valve is al provided a check state by the pressure lower than the check valve on the discharge side. The safety valve includes a valve body that contacts the valve seat, an urging means that urges the valve body toward the valve seat, a base that is disposed between the urging means and faces the valve body, and the base Operating means displaceable relative to,
  By displacing the operation means relative to the base, a state where the urging force of the urging means acts on the valve seat via the valve body and a state where the urging force does not act are changed. The reciprocating pump according to claim 1. 3. A cam mechanism for applying a force so that the operating means and the base face each other as the operating means and the base slide together is formed in the facing area of the base and the base. Reciprocating pump.

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