JPH0388971A - Reciprocative pump - Google Patents

Abstract

PURPOSE:To make the structure in small size, facilitate maintenance, and expand the pump service range by forming a pump chamber between the tip of a plunger, at which a check valve is fitted, and suction side check valves installed at a suction hole at the tip of the body, and sending the handling liquid sucked into the pump chamber through the action of the mentioned plunger. CONSTITUTION:Two suction side check valves 16 are fitted in series in a suction hole 32 at the tip of a pump body 30 and fastened by screwing of a joint 36, which forms a suction hole 35. A plunger 38 is fitted reciprocatively in a hollow 34 of the body 30. A discharge side check valve 18 is fitted at the tip of this plunger 38. A pump chamber 37 is formed between the tip of the plunger 38 and the suction side check valves 16, and into this chamber 37 the handling liquid is sucked from the suction hole 35 at the tip of the body 30 via the suction side check valves 16 through the action of the suction stroke of plunger 38. This handling liquid fed into a discharge chamber 40 by the suction stroke of plunger 38 is sent out via a discharge hole 46 by the compression stroke of the plunger.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a reciprocating pump, and in particular, at least one suction side check valve is inserted into the suction port at the tip of the pump body, and at least one check valve on the suction side is inserted at the tip of the plunger. A pump chamber is formed between the plunger tip and the suction side check valve by inserting one check valve, and the 7'Q handling liquid is sucked into this pump chamber and sent by reciprocating movement of the plunger. Regarding reciprocating pumps.

[Prior Art] Generally, a reciprocating pump that performs a pumping operation using a reciprocating pump mechanism such as a diaphragm or a granger is provided with a check valve in each of a suction pipe and a discharge pipe that communicate with a pump chamber.

FIG. 3 shows the configuration of a pump section in a typical conventional reciprocating pump, in which reference numeral 10 is a diaphragm head, 12 is a diaphragm, and 14 is a pump chamber. It is connected to and driven by an oval plunger to cause a change in volume within the pump chamber 14. Further, each of the pump chambers 14 has a check valve 1.
6.18 are connected to the suction pipe 20 and the discharge pipe 22, and under the action of these check valves 16.18, the pump handling liquid flows through the suction pipe 20. The liquid is sent through the pump chamber 14 and the discharge pipe 22.

[Problems to be Solved by the Invention] However, such conventional reciprocating pumps have a vertical structure in which a suction side check valve and a discharge side check valve are respectively arranged above and below the pump chamber. The plunger, which causes the volume change in the pump chamber, has the disadvantage that the pump structure becomes large because it has a structure that reciprocates horizontally with respect to the pump chamber. Even in the immersion type reciprocating pump, the plunger is configured to move vertically within the pump body, so the arrangement of the discharge side check valve with respect to the check valve provided on the suction side is limited. As a result, the structure of the pump body becomes large and heavy, which not only makes handling the pump difficult, but also limits the range of use of the pump and makes it exclusive.

Therefore, the object of the present invention is to insert at least one suction side check valve into the suction port at the tip of the pump body, and to insert at least one check valve into the plunger tip so that the plunger tip and the suction side A pump chamber is formed between the pump and the check valve, and the liquid sucked into the pump chamber is transferred by reciprocating movement of the plunger, thereby reducing the size of the pump body structure and facilitating maintenance. The object of the present invention is to provide a reciprocating pump that can extend the range of use of the pump.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, the handling liquid that has flowed into the pump chamber through the suction side check valve during the suction stroke of the plunger is transferred to the discharge side through the compression stroke of the plunger. In a reciprocating pump that sends liquid to the outside via a check valve,
At least one suction side check valve is inserted into the suction port formed at the tip, and a pump body has a hollow hole formed at the rear end to communicate with the suction port, and the pump body can be moved back and forth into the hollow hole of the pump body. a plunger with at least one discharge side check valve inserted into the tip, a pump chamber formed in the hollow hole between the plunger tip and the suction side check valve, and a pump chamber formed in the hollow hole between the plunger tip and the suction side check valve; A discharge passage formed in the plunger behind the discharge side check valve for discharge, and a part of the inner wall of the hollow hole formed as a large-diameter stepped hole so as to constantly communicate with the discharge passage during the reciprocating stroke of the plunger. The pump body is characterized by comprising a discharge chamber, and a discharge port bored in the pump body to communicate with the discharge chamber.

In this case, in the hollow hole of the pump body into which the plunger is inserted, sealing members for sealing the outer periphery of the plunger are provided at both front and rear ends of a discharge chamber that is formed to constantly communicate with the discharge passage within the reciprocating path of the plunger. It is preferable if it is provided.

In addition, the hollow hole in the pump body into which the plunger is inserted is
A part of the inner wall of the hollow hole is located on the suction port side of the pump body, adjacent to a discharge chamber in which a part of the inner wall of the hollow hole is formed into a large-diameter stepped hole so as to always communicate with the discharge passage during the reciprocating stroke of the plunger. A small hole having a small diameter is provided, and an auxiliary plunger 1 having a suction hole in the axial direction is slidably inserted into the small hole, and one end of the auxiliary plunger is connected to the tip of the plunger. A pump chamber may be formed on the end side, and a sealing member for sealing the outer periphery of the first auxiliary langeer may be provided in the small hole.

[Operation] The reciprocating pump according to the present invention includes at least one suction side check valve inserted into the suction port at the tip of the pump body, and
At least one check valve is inserted into the tip of the plunger to form a pump chamber between the tip of the plunger and the suction side check valve, and the handled liquid sucked into the pump chamber is sent by reciprocating movement of the plunger. By configuring this structure so that the liquid flows into the pump chamber through the suction side check valve during the suction stroke of the plunger, the handling liquid flows into the pump chamber through the discharge side check valve at the tip of the plunger during the compression stroke of the plunger. After passing through a discharge chamber that communicates with a discharge path formed at the rear,
It can be delivered from the outlet of the pump body.

Therefore, the structure of the pump body can be simplified and its size can be reduced.

[Example] Next, an example of a reciprocating pump according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, parts that are the same as the conventional structure shown in FIG. 3 are given the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is an overall sectional view of a reciprocating pump showing a first embodiment of the present invention.

That is, in FIG. 1, reference numeral 30 indicates a pump body, and this pump body 30 has a suction port 32 formed at its tip and a hollow hole 34 communicating with the suction port 32 at its rear end.

Furthermore, after two suction side check valves 16 are inserted in series into the suction port 32 at the tip of the pump body 30, these are fixed by screwing the joint 36 that forms the suction hole 35 into the pump body. A plunger 38 is inserted into the hollow hole 34 of 30 so as to be movable back and forth.

Two discharge side check valves 18 are inserted into the tip of this plunger 38 together with a joint 36' forming a suction hole 35', as described above, and behind the two discharge side check valves 18, which communicate with the discharge side check valves 18, are inserted. A passage 41 is drilled laterally through the plunger 38.

A pump chamber 37 is formed between the tip of the plunger 38 and the suction side check valve 1G, and the handled liquid is sucked into the pump chamber 37 from the suction hole 35 at the tip of the pump body 30 by the suction stroke of the plunger 38. It is sucked in through the side check valve 16.

On the other hand, a discharge chamber 40 having a diameter larger than the diameter of the hollow hole 34 is defined in a part of the inner wall of the hollow hole 34, and this discharge chamber 40 is located within the stroke of the reciprocating movement of the plunger 38, which is separate from the discharge path 41. At the same time, the outer circumference of the plunger 38 is sealed with a sealing member (for example, an O-ring) 42 at the front and rear of the chamber.
．． 44. Further, a discharge port 46 communicating with the discharge chamber 40 is formed in the pump body 30@ surface, and the handling liquid that flows into the discharge chamber 40 by the suction stroke of the plunger 38 is passed through the discharge port 46 by the compression stroke of the plunger. The liquid is sent to the outside.

Next, a second embodiment will be described with reference to FIG.

The discharge amount of the reciprocating pump shown in the first embodiment is determined by the diameter of the plunger 38 and its stroke.

Generally, in the case of a low discharge amount pump, the discharge amount can be changed by changing the motor rotation speed, but it can also be achieved by changing the diameter of the 1 langeer 38.

Therefore, the low discharge amount reciprocating pump shown in the second embodiment is configured as follows.

That is, a small diameter hole 50 is further formed at the tip of the hollow hole 34 in the pump body 31, and a suction hole 51 is provided in the axial direction at the tip of the plunger 38 to be slidably inserted into the small hole 50. Screw on the auxiliary plunger 52.

A pump chamber 54 is formed between the tip of this plunger 38 and the suction side check valve 1θ, and this auxiliary plunger 5
The gap between the outer periphery of the pump 2 and the small hole 50 is sealed with a sealing member 56, thereby preventing leakage from the pump chamber 54.

Therefore, if the stroke S of the plunger is constant, the amount of decrease in the discharge amount is (D-d)2.π.1/4.S, and a low amount of liquid can be delivered.

That is, the reciprocating pump of the present invention configured as described above is not only a diaphragm type reciprocating pump in which check valves are arranged in series in the vertical direction, but also a diaphragm type reciprocating pump in which check valves are arranged vertically in series.
- type can be used not only as a reciprocating plunger pump with check valves arranged in series in the horizontal direction, but also as a vertical immersion type reciprocating pump.

[Effects of the Invention] As is clear from the embodiments described above, the reciprocating pump according to the present invention has at least one inlet at the tip of the pump body.
At least one check valve is inserted into the tip of the plunger to form a pump chamber between the tip of the plunger and the suction side check valve. By configuring the suctioned handling liquid to be sent by reciprocating the plunger, the structure of the pump body can be simplified and downsized, and its handling 4
゜ is extremely easy, and the manufacturing cost of MgfJ can be reduced. Furthermore, it has the advantage that the range of use as a reciprocating pump can be further expanded.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

Fig. 1 is an overall sectional view of a reciprocating pump showing a first embodiment of the present invention, Fig. 2 is a partial sectional view of a reciprocating pump showing a second embodiment of the invention, and Fig. 3 is a conventional reciprocating pump. It is a partial sectional view showing a pump part of a reciprocating pump. 10...Diaphragm head 12...Diaphragm 14...Pump chamber 16.
...Suction side check valve 18...Discharge side check valve 20...
・Suction pipe 22...Discharge pipe 30, 31...
Pump body 32... Suction port 34... Hollow hole 35, 3
5'...Suction holes 37, 54...Pump chamber 40...Discharge chamber 42, 44...Seal member 50...Small hole 52...Auxiliary plunger 38, 36'...Joint 38... ...Plunger 41...Discharge path 4G...Discharge port 51...Suction hole 56...Seal member procedure amendment (method) 1. Indication of the incident 1999 Patent Application No. 222882 2. Invention Name Reciprocating Pump 3, Relationship with the case of the person making the amendment Patent Applicant Address Waku Shikibori Monto 2-27-10 Name Name Nikkiso Eiko F Jojo Co., Ltd. Naotake Sakai 4, Agent [1) 1m .

Claims (3)

[Claims] (1) A reciprocating pump that sends the liquid that flows into the pump chamber through the suction side check valve during the suction stroke of the plunger to the outside through the discharge side check valve during the compression stroke of the plunger, is formed at the tip. At least one suction-side check valve is inserted into the suction port, and the pump body has a hollow hole formed at the rear end to communicate with the suction port. a plunger having at least one discharge side check valve inserted in its tip; a pump chamber formed in the hollow hole between the plunger tip and the suction side check valve; A discharge passage formed in the plunger at the rear of the discharge side check valve, and a discharge chamber in which a part of the inner wall of the hollow hole is formed into a large diameter stepped hole so as to constantly communicate with the discharge passage during the reciprocating stroke of the plunger. and a discharge port bored in the pump body to communicate with the discharge chamber. (2) In the hollow hole of the pump body into which the plunger is inserted, a sealing member for sealing the outer periphery of the plunger is provided at both front and rear ends of a discharge chamber that is formed to constantly communicate with the discharge passage within the reciprocating path of the plunger. The reciprocating pump according to claim 1, further comprising: a reciprocating pump. (3) The hollow hole in the pump body into which the plunger is inserted is
A part of the inner wall of the hollow hole is located on the suction port side of the pump body, adjacent to a discharge chamber in which a part of the inner wall of the hollow hole is formed into a large-diameter stepped hole so as to always communicate with the discharge passage during the reciprocating stroke of the plunger. A small hole having a small diameter is provided, and an auxiliary plunger having a suction hole in the axial direction is slidably inserted into the small hole, and one end of the auxiliary plunger is connected to the tip of the plunger, and the other end is connected to the tip of the plunger. 3. The reciprocating pump according to claim 1, further comprising a pump chamber formed on the side of the reciprocating pump, and a sealing member for sealing the outer periphery of the auxiliary plunger in the small hole.