JPH05321824A - Reciprocating pump - Google Patents

Abstract

PURPOSE:To provide a reciprocating pump capable of being formed easily and small in size while ensuring the fixed characteristic of discharge flow. CONSTITUTION:A hose joint 28 is provided with an annular insertion part 28a inserted in enlarged circular flange parts 22a, 24a formed at an intake port 22 and a discharge port 24. The seat face 26a of a poppet valve 26 is fused or adhered to a seat face 28b integratedly. The hose joint 28, intake port 22 and discharge port 24 are fastened and coupled by a nut 34 through an O ring 32 arranged inside the groove part 28 of the insertion part 28a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating pump used for medical purposes.

[0002]

2. Description of the Related Art Generally, a reciprocating pump of this type is shown in FIG.
As shown in FIG. 4 (however, only the discharge port side is shown in the drawing), the discharge port 10 of the pump body (not shown)
Is connected to a hose (not shown) via a check valve (poppet valve 12 in FIG. 2, ball valves 14, 14 in FIGS. 3 and 4), and hose joint 16.

The discharge port 10, the check valves 12 and 14,
Sealing means is arranged between the hose joint 14 and the hose joint 16 so as to prevent external liquid leakage from the joint portion of the handled liquid and internal liquid leakage at the check valve portion. That is, in FIG. 2, a gasket (O ring) 18 a is arranged between the discharge port 10 and the poppet valve 12. Further, in FIG. 3, a gasket 18b, a seat 18c, a gasket 18d and a gasket 18e are arranged between the discharge port 10, the ball guide 14a and the hose joint 16, respectively. Further, in FIG. 4, a gasket / sheet 18 f, a gasket 18 f
A gasket 18g is provided.

[0004]

However, the conventional reciprocating pump described above has the following drawbacks.

That is, in the above-mentioned prior art, the seals between the discharge port (and suction port), the check valve and the hose joint are all composed of gaskets in which O-rings are arranged in a plane. It is generally extremely difficult to uniformly tighten and deform these gaskets by controlling the tightening margins. Therefore, in the prior art, there is a problem that the seal of the seal portion (external liquid leakage from the hose joint portion and internal liquid leakage at the check valve portion) cannot be reliably achieved. However, the above-mentioned drawbacks have been a fundamental drawback, especially in medical reciprocating pumps, because the quantitativeness of the discharge flow rate is required. Further, the above-mentioned conventional technique has a drawback that the structure becomes complicated and the size becomes large, especially when the check valve is constituted by a ball valve.

Therefore, an object of the present invention is to provide a reciprocating pump which can secure quantitativeness and can be simply and compactly constructed.

[0007]

In order to achieve the above object, a reciprocating pump according to the present invention is a reciprocating pump in which a suction port and a discharge port of a pump body are connected to a hose through a check valve and a hose joint. In the dynamic pump, the check valve and the hose joint and / or the check valve and the suction port and the discharge port are integrally joined.

In this case, the integral joining can be performed by welding and / or bonding.

Further, it is preferable that the hose joint is constructed so that an insertion portion is provided for the suction port and the discharge port, the nut is tightened and coupled, and an O-ring is fitted into the peripheral surface of the insertion portion through a groove portion. is there.

[0010]

In the present invention, the check valve is constructed so as to be integrally joined to the hose joint and / or the suction port and the discharge port. As a result, internal liquid leakage at the check valve portion is reliably prevented. Further, in the present invention, the hose joint is configured such that an insertion portion is provided for the suction port and the discharge port, the nut is tightened and coupled, and an O-ring is fitted on the peripheral surface of the insertion portion through the groove portion. As a result, leakage of external liquid from the hose joint can be reliably prevented. Therefore, the quantitativeness of the discharge flow rate is surely achieved.

Further, the present invention has the advantages that the number of parts is small, the structure can be made simple and small, and the assembling can be carried out easily and surely.

[0012]

Embodiments of the reciprocating pump according to the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the reciprocating pump of the present invention. The overall structure of the reciprocating pump is the same as the conventional one shown in FIGS. That is, in the reciprocating pump, the suction port 22 and the discharge port 24 of the pump body 20 are connected to the check valve (poppet valve) 26, the hose joint 2
It is configured to connect to the hose 30 via 8.

However, in the present invention, the hose joint 28 has the annular insertion portions 28a which are inserted into the enlarged annular collar portions 22a and 24a provided at the suction port 22 and the discharge port 24, respectively, and the poppet valve. The sheet surface 26a is configured to be integrally joined to the sheet surface 28b of the insertion portion 28a of the hose joint 28 by welding or adhesion. As an alternative, the seat surface 26a of the poppet valve 26 may include the suction port 22 and the discharge port 24.
You may join to the sheet surface of. Furthermore, the check valve could alternatively consist of a ball valve.
And in the present invention, the hose joint 28 and the suction port 2
2 and the discharge port 24 are the insertion portion 28a and the collar portion 22.
The a and 24a are coupled by tightening the nut 34 via the O-ring 32 arranged in the groove 28c of the insertion portion 28a.

Therefore, according to the present embodiment having such a structure, the internal liquid leakage at the check valve portion is completely prevented by the integral joint and the external liquid leakage from the hose joint. Also, since the O-ring arranged on the peripheral surface has a sealing property irrelevant to the tightening force of the nut,
Certainly prevented. That is, the quantitativeness of the discharge flow rate is surely achieved. Further, the present invention has a small number of parts and is configured to be simple and small, and in particular, the check valve can be assembled by simply tightening the nuts of the hose joints integrally joined thereto. There is an advantage that attachment can be performed easily and surely.

The present invention has been described above with reference to a preferred embodiment, but the present invention is not limited to the above embodiment.
Many design changes are possible without departing from the spirit.

[0017]

As described above, the reciprocating pump according to the present invention is a reciprocating pump in which the suction port and the discharge port of the pump body are connected to the hose via the check valve and the hose joint. Since the hose joint and / or the check valve and the suction port and the discharge port are integrally joined, internal liquid leakage at the check valve portion is reliably prevented. Further, in the present invention, the hose joint is configured such that an insertion portion is provided for the suction port and the discharge port, the nut is tightened and coupled, and the O-ring is fitted into the peripheral surface of the insertion portion through the groove portion. As a result, leakage of external liquid from the hose joint can be reliably prevented. Therefore,
The quantitativeness of the discharge flow rate is surely achieved.

Furthermore, the reciprocating pump of the present invention has the advantages that it can be constructed in a simple and compact form with a small number of parts, and that it can be assembled particularly easily and reliably.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of essential parts showing an embodiment of a reciprocating pump according to the present invention.

FIG. 2 is a sectional view of an essential part showing a configuration example of only a discharge side portion of a conventional reciprocating pump.

FIG. 3 is a cross-sectional view of an essential part corresponding to FIG. 2, showing another configuration example of the conventional reciprocating pump.

FIG. 4 is a sectional view of a main part corresponding to FIGS. 2 and 3, showing still another configuration example of the conventional reciprocating pump.

[Explanation of symbols]

20 Pump Body 22 Suction Port 22a Annular Collar 24 Discharge 24a Annular Collar 26 Poppet Valve 26a Seat Surface 28 Hose Joint 28a Annular Insert 28b Seat Surface 28c Groove 30 Hose 32 O-ring 34 Nut

Claims (3)

[Claims] 1. A reciprocating pump in which a suction port and a discharge port of a pump body are connected to a hose through a check valve and a hose joint, wherein a check valve and a hose joint and / or a check valve, a suction port and a discharge port. A reciprocating pump characterized by integrally joining and. 2. The reciprocating pump according to claim 1, wherein the integral joining is performed by welding and / or bonding. 3. The reciprocation according to claim 1, wherein the hose joint is provided with an insertion part for the suction port and the discharge port, nut-tightly coupled, and an O-ring is inserted into the peripheral surface of the insertion part through a groove. Dynamic pump.