Metering pump with chemical corrosion resistant rubber safety diaphragm

Abstract

The utility model discloses a metering pump with a chemical corrosion resistant rubber safety diaphragm. The metering pump comprises a pump body assembly, a pump head and a diaphragm assembly. The pump head is fixed to the power output end of the pump body assembly. And the pump head is provided with an overflowing channel. Two one-way valve assemblies are symmetrically arranged at the two ends of the overflowing channel. And the pump head is provided with a movable cavity communicated with the overflowing channel. The diaphragm assembly is installed at the opening of the movable cavity. The first diaphragm is arranged at the opening of the movable cavity of the pump head, and the protective diaphragm is sleeved outside the output end of the pump body assembly, so that double protection is formed between the pump head and the pump body assembly, and when the first diaphragm is damaged, the protective diaphragm can block conveyed liquid, and damage to the pump body assembly is avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of metering pump, concretely relates to a metering pump with chemical corrosion resistance rubber safety diaphragm. BACKGROUND

[0002] Mechanical diaphragm metering pump is a kind of special volume pump that can meet the needs of various strict process flow, and flow can be steplessly regulated in 0%~100% range, to be used to transport liquid (especially corrosive liquid).

[0003] Mechanical diaphragm metering pump is widely applied in water treatment industry and the field of part chemical because of its relatively low cost, simple structure and convenient maintenance, in recent years, due to the rapid market development, after a part of process improvement, the requirement of mechanical diaphragm metering pump is higher and higher.

[0004] Since the diaphragm of mechanical diaphragm pump is a wearing part, the diaphragm does not have fixed service life, and the diaphragm is deformed and broken after being subjected to impurity debris and material accumulation.The output liquid enters the mechanical part of pump body from the broken place of diaphragm, causes system overpressure or chemical corrosion, and finally causes system failure. UTILITY MODEL CONTENTS

[0005] In order to make up for the deficiency of prior art, the utility model provides a metering pump with chemical corrosion resistance rubber safety diaphragm to solve the technical problem that the main part of metering pump is damaged due to diaphragm breakage.

[0006] To achieve the above object, the specific technical scheme of the utility model is as follows:

[0007] A metering pump with chemical corrosion resistance rubber safety diaphragm, comprising pump body assembly, pump head and diaphragm assembly. The pump head is fixed on the power output end of pump body assembly. The pump head is provided with overflow passage. Two one-way valve assemblies are symmetrically arranged at the two ends of overflow passage. The pump head is provided with movable cavity in communication with overflow passage. The diaphragm assembly is installed at the opening of movable cavity.

[0008] The diaphragm assembly comprises first diaphragm and protective diaphragm. The first diaphragm is fixed at the opening of movable cavity. The protective diaphragm is sleeved on the output end of pump body assembly.

[0009] Further, the protective diaphragm is divided into blocking part of inner ring and connecting part of outer ring. The caliber size of blocking part port is same with the size of pump body assembly output end.

[0010] Further, the mounting base is arranged between the pump head and pump body assembly, to realize the connection and fixation between the pump head and pump body assembly.

[0011] Further, the inner wall of the mounting base is provided with a hook-shaped limiting portion.

[0012] Further, the pump body assembly comprises a plunger rod and a metering pump body.

[0013] Further, the plunger is provided with a concave mounting portion.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The utility model discloses a first diaphragm is arranged at the opening of the movable cavity of the pump head, and a protective diaphragm is sleeved on the output end of the pump body assembly, so that double protection is formed between the pump head and the pump body assembly.

[0016] 2. The utility model discloses a concave mounting portion is arranged on the plunger, and a second protruding portion is arranged on the inner ring of the blocking portion of the protective diaphragm. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the overall structure schematic diagram of the utility model;

[0018] Figure 2 It is the relative position schematic diagram of the pump head, the pump body assembly and the diaphragm assembly in the utility model;

[0019] Figure 3 It is the relative position schematic diagram of the first diaphragm and the protective diaphragm in the utility model (A part local enlarged view); Figure 2

[0020] Figure 4 It is the structure schematic diagram of the protective diaphragm in the utility model (B part local enlarged view)。 Figure 3

[0021] Reference numerals: 1, pump body assembly;2, pump head;3, diaphragm assembly;4, one-way valve assembly;5, first diaphragm;6, protective diaphragm;6-1, blocking portion;6-2, connecting portion;6-3, first protruding portion;6-4, second protruding portion;7, mounting base;8, plunger rod. DETAILED DESCRIPTION ​​

[0022] In the description of the utility model, it needs to understand that the orientation or position relation indicated by the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "central", "end", "length", "outer end" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as a limitation on the utility model.

[0023] The utility model will be further described below in combination with the drawings.

[0024] As shown in Figure 1 and 2 , a metering pump with chemical corrosion resistant rubber safety diaphragm, comprising pump body assembly 1, pump head 2 and diaphragm assembly 3. Wherein, pump head 2 is fixed on the power output end of pump body assembly 1. The through-flow channel is set up on pump head 2. Two one-way valve assemblies 4 are symmetrically arranged at the two ends of the through-flow channel, for realizing the delivery of liquid. The movable cavity that is communicated with the through-flow channel is set up on one side of pump head 2. Diaphragm assembly 3 is installed at the opening of movable cavity. When using, the power output end in pump body assembly 1 passes through first diaphragm 5 assembly 3, and performs the action of pumping and sucking, realizing the transmission of liquid in pump head 2.

[0025] As shown in Figure 2 and 3 , diaphragm assembly 3 comprises first diaphragm 5 and protective diaphragm 6. Wherein, first diaphragm 5 is fixed at the opening of movable cavity, and can continuously perform the action of pumping and sucking under the drive of pump body assembly 1. Protective diaphragm 6 is sleeved on the output end of pump body assembly 1, and can block the leakage of liquid when first diaphragm 5 breaks, effectively avoiding the penetration of liquid into the inner cavity of pump body, and increasing the protection effect.

[0026] As shown in Figure 3 and 4 , protective diaphragm 6 is divided into blocking part 6-1 of inner ring and connecting part 6-2 of outer ring. Wherein, the caliber size of the port of blocking part 6-1 is same with the size of the output end of pump body assembly 1, so that the inner ring of protective diaphragm 6 can better fit on the output end of pump body assembly 1.

[0027] In the embodiment, mounting base 7 is arranged between pump head 2 and pump body assembly 1, for realizing the connection and fixation between pump head 2 and pump body assembly 1. The inner wall of mounting base 7 is provided with limit part in the shape of hook. The outer ring of connecting part 6-2 is provided with first protruding part 6-3 matched with the limit part. First protruding part 6-3 is embedded in the limit part, thereby realizing the sealing between mounting base 7 and pump body assembly 1.

[0028] AsFigure 2 As shown in the figure, the pump body assembly 1 comprises a plunger rod 8 and a metering pump body (not shown in the figure). The plunger rod 8 is capable of reciprocating along the horizontal direction under the drive of the metering pump body, and drives the first diaphragm 5 to perform suction movement. The protective diaphragm 6 is sleeved on the plunger.

[0029] In the embodiment, a concave mounting portion is formed on the plunger. The inner ring of the blocking portion 6-1 of the protective diaphragm 6 is provided with a second protruding portion 6-4 matched with the mounting portion. The second protruding portion 6-4 is embedded in the mounting portion, which further avoids the liquid leaked from the crack of the first diaphragm 5 from extending to the metering pump body through the surface of the plunger.

[0030] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A metering pump with a chemically resistant rubber safety diaphragm, comprising a pump body assembly (1), a pump head (2), and a diaphragm assembly (3); the pump head (2) is fixed to the power output end of the pump body assembly (1); a flow passage is provided on the pump head (2); two one-way valve assemblies (4) are symmetrically arranged at both ends of the flow passage; the pump head (2) has a movable cavity communicating with the flow passage; the diaphragm assembly (3) is installed at the opening of the movable cavity, characterized in that: The diaphragm assembly (3) includes a first diaphragm (5) and a protective diaphragm (6); the first diaphragm (5) is fixed at the opening of the active cavity; the protective diaphragm (6) is overlaid on the output end of the pump body assembly (1).

2. The metering pump with a chemically resistant rubber safety diaphragm according to claim 1, characterized in that: The protective diaphragm (6) is divided into an inner ring barrier (6-1) and an outer ring connecting part (6-2); the diameter of the port of the barrier (6-1) is the same as the size of the output end of the pump body assembly (1).

3. A metering pump with a chemically resistant rubber safety diaphragm according to claim 2, characterized in that: An mounting base (7) is provided between the pump head (2) and the pump body assembly (1) to achieve connection and fixation between the pump head (2) and the pump body assembly (1).

4. A metering pump with a chemically resistant rubber safety diaphragm according to claim 3, characterized in that: The inner wall of the mounting base (7) is provided with a hook-shaped limiting part; the outer ring of the connecting part (6-2) is provided with a first protrusion (6-3) that cooperates with the limiting part; the first protrusion (6-3) is embedded in the limiting part.

5. A metering pump with a chemically resistant rubber safety diaphragm according to claim 2, characterized in that: The pump assembly (1) includes a plunger rod (8) and a metering pump body; the plunger rod (8) is capable of reciprocating along the horizontal direction under the drive of the metering pump body; the protective diaphragm (6) is fitted over the plunger.

6. A metering pump with a chemically resistant rubber safety diaphragm according to claim 5, characterized in that: The plunger has a recessed mounting portion; the inner ring of the barrier portion (6-1) of the protective diaphragm (6) has a second protrusion (6-4) that cooperates with the mounting portion; the second protrusion (6-4) is embedded in the mounting portion.

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