Valve structure for chemical injection pump and chemical injection pump equipped with same

Abstract

To provide a new valve structure which is used in a chemical injection pump.SOLUTION: A new valve structure is configured so that a valve box 20 and a valve seat 30 as a valve seat of a valve ball 40 are separable from each other. A valve seat 30A and a valve ball 40A are used for 5 to 20 L discharge, a valve seat 30B and a valve ball 40B are used for 0.3 to 12 L discharge (for low discharge), and the valve box 20 is commonly usable. In addition, the valve seat 30 is a reversible type which is vertically symmetrically formed.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a valve structure used in a chemical injection pump. [Background technology]

[0002] A chemical injection pump is sometimes used for soil improvement (for example, Patent Document 1, etc.). Until now, the valve structure used in this chemical injection pump has been an integrated type in which the valve box supporting the valve seat, which serves as the valve seat for the valve ball, and the valve seat are inseparable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 55-108517 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when stable discharge could no longer be maintained due to wear, the valve seat had to be machined using a lathe. It could be machined down and reused up to three or four times, but when the height was no longer sufficient for regeneration, the entire valve box had to be discarded.

[0005] Valve boxes are expensive, and the fact that they are discarded even when there are no problems other than the valve seats is clearly an issue that needs improvement.

[0006] Therefore, the inventors of the present application have completed a new valve structure to solve the above problems. [Means for solving the problem]

[0007] The first invention is a valve structure used in a chemical injection pump, characterized in that the valve box supporting the valve seat that serves as a valve seat for the valve ball and the valve seat are configured to be separable. A second invention relates to a valve structure for a chemical liquid injection pump according to the first invention, characterized in that the valve seat is a reversible type formed symmetrically above and below. The third invention is a valve structure for a chemical injection pump according to the first or second invention, characterized in that the valve box is not replaced, but a valve seat corresponding to a low-discharge valve ball is fitted into the valve box. A fourth invention is a liquid medicine injection pump comprising the valve structure for a liquid medicine injection pump according to any one of the first to third inventions. Effect of the Invention

[0008] The present invention has the following advantages. (1) The valve box, which supports the valve seat that serves as the valve ball's valve seat, and the valve seat are configured to be separable, so that if stable discharge cannot be maintained due to wear, only the valve seat needs to be replaced and the valve box can be used as is. Compared to a valve box / valve seat integrated type, the cost of a separate valve box / valve seat type can be kept extremely low. (2)The valve seat is a reversible type that is formed symmetrically on the top and bottom, so one valve seat can be used twice, on the front and back. (3) By making the valve box and valve seat separate, the valve can be freely converted from low discharge to high discharge by simply replacing the valve seat without replacing the valve box. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram showing a valve box and valve seat integrated type (prior art). [Diagram 2]FIG. 1 is an explanatory diagram showing the valve box / valve seat separation type (the present invention). [Diagram 3] FIG. 2 is an explanatory diagram showing the valve box / valve seat separated type (present invention). [Figure 4] FIG. 3 is an explanatory diagram showing the valve box / valve seat separated type (the present invention). [Diagram 5] FIG. 4 is an explanatory diagram showing the valve box / valve seat separation type (the present invention). [Figure 6] FIG. 5 is an explanatory diagram showing the valve box / valve seat separation type (the present invention). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is an explanatory diagram showing, as a comparative example, an integrated type in which a valve box and a valve seat are integrated together. A conventional valve box 10 is provided with a valve seat 11 that serves as a valve seat for a valve ball (not shown) integrated inside the main body. When this valve seat 11 comes into contact with the valve ball, the contact area is worn out.

[0011] When the valve seat 11 wears out and can no longer maintain stable discharge, the valve seat 11 is machined on a lathe. Naturally, during this time, the valve box 10 cannot be used. In addition, there is a limit to the number of times that the valve seat 11 can be regenerated by machining (usually about 3 to 4 times), so when the valve seat 11 can no longer be regenerated by machining, the valve box 10 must be discarded even if there are no other problems.

[0012] Therefore, we invented a separate type valve box and valve seat, as shown in Figure 2. The valve structure of the present invention is configured so that the valve box 20 and the valve seat 30 that serves as a valve seat for the valve ball 40 can be separated from each other. Here, the valve seat 30A and the valve ball 40A are for a discharge of 5 to 20 L, and the valve seat 30B and the valve ball 40B are for a discharge of 0.3 to 12 L (low discharge), and the valve box 20 can be used in common.

[0013] FIG. 3 illustrates a separate valve box 20 and valve seat 30. FIG. 4 illustrates a state in which the valve seat 30 illustrated in FIG.

[0014] FIG. 5 illustrates a state in which the valve ball 40 is in contact with the valve seat 30. FIG. 6 shows the valve seat 30 from the front. The portion of the valve seat 30 that comes into contact with the valve ball 40 is subject to wear (see FIG. 5). On the other hand, the valve seat 30 is a reversible type that is formed symmetrically up and down (see FIG. 6).

[0015] Therefore, when one of the contact portions of the valve seat 30 is worn out, the other contact portion that is not worn out can be used in reverse. In other words, one valve seat 30 can be used twice. Furthermore, the valve seat 30 with both contact portions worn out can be simply discarded, and there is no need to discard the valve box 20 (only the valve seat 30 needs to be replaced). [Industrial Applicability]

[0016] The present invention can be widely used as a valve structure for use in liquid drug injection pumps. [Explanation of symbols]

[0017] 10: Valve box (conventional example) 11: Valve seat (integrated valve box and seat) (conventional example) 20: Valve box 21: Recess (valve seat fitting portion) 30: Valve seat (30A, 30B) 31: O-ring 40: Valve ball (40A, 40B)

Claims

1. A valve structure used in a chemical injection pump for soil improvement, The valve box supports a valve seat that serves as a valve seat for the valve ball, and the valve seat is configured to be separable from the valve box. The valve seat is a reversible type in which an O-ring is provided at the center of the outer periphery of a ring body having a perforation for discharging a chemical solution, and the ring body is provided with convex portions having contact portions that come into line contact with the valve ball on the top and bottom of the ring body, so that the valve seat is formed symmetrically on the top and bottom, A valve structure for a chemical injection pump, characterized in that the valve seat corresponding to the valve ball for low discharge or high discharge can be freely fitted and changed without replacing the valve box.

2. A liquid injection pump comprising the valve structure for a liquid injection pump according to claim 1.

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