JPS63314377A - Valve device for reciprocating pump - Google Patents

Abstract

PURPOSE:To obtain a reciprocating pump which has a simple constitution and can be used for a long time by arranging a suction valve and a discharge valve so that the centers are set in a same straight line and constituting the valve seats of the valves, valve bodies, stoppers, etc., as an assembly assembled with the center rods. CONSTITUTION:A suction valve installation part 45a and a discharge valve installation part 45b are formed onto a manifold 14 at the top of a plunger pump 10 so that the center lines are set on a same straight line, and a suction valve 46 and a discharge valve 48 are installed. The suction valve 46 and the discharge valve 48 have the shaft members 50a and 50b having the center rod parts 54a and 54b and the valve seats 56a and 56b formed integrally onto the center rod parts 54a and 54b. Further, collars 58a and 58b and stoppers 60a and 60b are fitted onto the center rod parts 54a and 54b and fastened by the screwing by nuts 62a and 62b. Then, the valve bodies 63a and 63b externally fitted onto the collars 58a and 58b are assembled by the energizing in the direction for the closing by the springs 64a and 64b.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a suction valve and a discharge valve of a reciprocating pump,
Specifically, the present invention relates to a valve device that can improve the ease of mounting of a suction valve and a discharge valve.

[Conventional technology]

FIG. 8 is a structural diagram of a plunger pump 10 including a conventional valve device, showing a source manifold 12 and a destination manifold 14.
are joined to each other. The plunger 16 is arranged to be able to reciprocate within the original manifold 12, and the pump chamber 18 is connected to the tip manifold 14 on the tip side of the plunger 16.
partitioned within. The cylinder body 20 is the original manifold 12
The plunger 16 slides on the inner periphery of the cylinder body 20 , and a seal packing 22 , a compression coil spring 24 , and a metal fitting 26 are fitted into the stepped portion of the inner periphery of the cylinder body 20 . The tightness of the pump chamber 18 is maintained against sliding. The suction port 28 and the discharge port 30 are provided in the source manifold 12 and the destination manifold 14, respectively, and communicate with the pump chamber 18. The suction valve 32 and the discharge valve 34 are respectively attached to the suction valve attachment part 35a and the discharge valve attachment part 35b of the front manifold 14, and have the same structure. That is, the suction valve 32 and the discharge valve 34 have valve seats 36a and 36b that are fitted with pilots in the suction valve mounting part 35a and the discharge valve mounting part 35b, and the valve seats 36a.
, 36b; valve bodies 40a, 40b disposed within the sacks 38a, 38b so as to be displaceable in the axial direction; and valve bodies 40a, 40b disposed within the sacks 38a, 38b. Valve seats 36a, 36b
It has compression coil springs 42a and 42b that bias it toward. The O-rings 43a, 43b are the valve seat 36a,
The suction valve mounting portion 35 is fitted into the annular groove on the outer periphery of the suction valve mounting portion 36b.
a and the discharge valve mounting portion 35b and the valve seats 36a and 36b.

After the suction valve 32 and the discharge valve 34 are inserted into the front manifold 14 through holes formed in the wall of the front manifold 14, blind plugs 44a,
44b are screwed together, and the blind plugs 44a, 44b press the suction valve 32 and the discharge valve 34 against the suction valve mounting part 35a and the discharge valve mounting part 35b.

[Problem that the invention seeks to solve]

The sacks 38a and 38b of the suction valve 32 and the discharge valve 34 are generally made of resin molded products from the viewpoint of cost reduction.
Due to the pressing force of the blind plugs 44a, 44b and the strong load compression coil springs 42a, 42b, the sacks 38a, 38b are used.
deforms over time, and as a result, the suction valve 32 and the discharge valve 3
4 and the blind plugs 44a, 44b, or the valves a36a, 36b become loose, which impedes the stable functioning of the suction valve 32 and the discharge valve 34, and causes the valve seats 36a,
36b, the valve bodies 40a, 40b, etc., resulting in premature wear and damage.

In particular, early wear of the O-rings 43a, 43b due to rattling of the valve seats 36a, 36b
This may cause filtrate leakage around the outer circumference of the O-ring 4.
To replace valve seat 36a and 43b, use a special jig.
, 36b to the suction valve mounting part 35a and the discharge valve mounting part 35.
It has to be pulled out from b, making the replacement work complicated.

An object of the present invention is to provide a valve device for a reciprocating pump that can eliminate problems caused by deformation of the sack over time in conventional suction valves and discharge valves.

[Means for solving problems]

In the valve device of the reciprocating pump according to the present invention, the suction valve and the discharge valve are respectively arranged in the suction valve mounting part and the discharge valve mounting part of the pump chamber so that their center lines are on the same straight line, The valve and the discharge valve include a mandrel, a valve seat that is fixed to the mandrel in the axial direction and is locked to the suction valve mounting part and the discharge valve mounting part by pressing in the axial direction, and a valve seat that is fixed to the mandrel in the axial direction. a stopper that is axially fixed to the mandrel at a position away from the seat; a compression coil spring that is compressed between the valve seat and the stopper and urges the valve element toward the valve seat; and a compression coil spring that is coupled to the mandrel and that and a connecting shaft protruding toward the discharge valve or suction valve, the threading directions at the ends near each other of the inner connecting shafts are opposite, and the connecting nut is inserted at both ends. It is screwed onto the inner connecting shaft.

Furthermore, the suction valve of the reciprocating pump according to the present invention is arranged in the suction valve mounting part and the discharge valve mounting part of the pump chamber, respectively, so that the center lines of the suction valve and the discharge valve are on the same straight line. The suction valve and the discharge valve each include a stem portion, and a valve seat that is integrally or integrally fixed to the stem portion in the axial direction and is locked to the suction valve mounting portion and the discharge valve mounting portion by pressing in the axial direction. , a stopper fixed to the mandrel in the axial direction at a position away from the valve seat in the axial direction of the mandrel, and a compression coil spring compressed between the valve seat and the stopper and urging the valve body toward the valve seat. The connecting shaft has threaded portions with different threading directions at both ends thereof, and both ends of the connecting shaft are screwed into the suction valve and the discharge valve.

[Effect]

The suction valve and the discharge valve are connected to each other via a connecting shaft and a connecting nut, or via a connecting shaft. The threading direction of the threaded portion between the inner connecting shaft portion and the connecting nut, or the threading direction of the threaded portion between both ends of the connecting shaft and the suction valve and the discharge valve are opposite to each other. Therefore, when the connecting nut or the connecting shaft is rotated, the amount of thread engagement in both the threaded portions increases or decreases at the same time, and in the case of an increase in the amount of thread engagement, the suction valve and the discharge valve are brought closer to each other, and the suction valve and the discharge valve are The valve seat is firmly fixed by being pressed by the suction valve mounting part and the discharge valve mounting part. Furthermore, in the case of a reduction in the amount of screw engagement, the suction valve and the discharge valve are moved away from each other, and the valve seats of the suction valve and the discharge valve are separated from the suction valve mounting part and the discharge valve mounting part.

〔Example〕

The present invention will be described below with reference to the embodiments shown in FIGS. 1 to 7. Note that the explanation of the parts that overlap with those in FIG. 8 will be omitted, and only the differences will be explained.

FIG. 1 is a structural diagram of a plunger pump 10 equipped with a valve device according to the present invention, and FIG. 2 is a front view of the valve device of FIG. 1. The suction valve mounting part 45a and the discharge valve mounting part 45b are
They are formed in the front manifold 14 so that their center lines are on the same straight line, and the suction valve 46 and the discharge valve 48 are respectively installed in the suction valve mounting part 45a and the discharge valve mounting part 45b. The center lines of the discharge valves 48 are on the same straight line. The shaft members 50a, 50b each include a connecting shaft portion 52a, 52b and a shaft portion 54a, 54b, and the connecting shaft portion 52a, 52b and a shaft portion 54a,
54b are each formed integrally. Valve seat 56a,
56b has through holes 57a and 57b, and the shaft portion 54
a, 54b, and the shaft portions 54a, 5
4b are fitted with collars 58a, 58b and stoppers 60a, 60b in order from those closest to the valve seats 56a, 56b, and nuts 62a, 62b.

The collars 58a, 58a are screwed onto the stems 54a, 54b
58b and the stopper 60a, 60b is the valve seat 56a,
It is tightened toward 56b. The valve bodies 63a, 63b are slidably fitted to the outer peripheries of the collars 58a, 58b, and the compression coil springs 64a, 64b are fitted to the stoppers 60a, 64b.
60b and the valve bodies 63a, 63b to bias the valve bodies 63a, 63b toward the valve seats 56a, 56b. The valve seats 56a and 56b are fitted into the suction valve mounting portion 45a and the discharge valve mounting portion 45b, respectively, and form a flange 65a.

65b are formed on the valve seats 56a and 56b, respectively, and abut on the stepped portions of the suction valve mounting portion 45a and the discharge valve mounting portion 45b. The O-rings 66a, 66b are the valve seats 56a,
56b, and maintains tightness between the outer peripheries of the valve seats 56a and 56b and the suction valve mounting portion 45a and the discharge valve mounting portion 45b.

The ends of the inner connecting shaft portions 52a and 52b that are closer to each other have thread grooves with different threading directions (for example, the connecting shaft portions 52
a and 52b are formed with left-handed threads and right-handed threads, respectively, and the connecting nut 68 has connecting shaft portions 52a and 52b at both ends.
52b to connect the inner connecting shaft portions 52a and 52b. The suction valve 46 and the discharge valve 48 are blind plugs 44a,
A blind plug 70 is formed in the front manifold 14 at a position facing the tip of the plunger 16, and the connecting nut 68 is closed by the blind plug 70. It is inserted into the manifold 14 from the hole.

Since the threading directions of the threaded grooves at the threaded portions between both ends of the connecting nut 68 and the connecting shafts 52a and 52b are reversed, rotation of the connecting nut 68 connects both ends of the connecting nut 68. Screwing with shaft portions 52a and 52b:
! l increases or decreases. In the case of rotation in the direction of increasing the amount of screw engagement, the suction valve 46 and the discharge valve 48 are brought closer to each other.

The valve seats 56a and 56b of the suction valve 46 and the discharge valve 48 are firmly fixed by being pressed by the suction valve mounting part 45a and the discharge valve device part 45b. Nine. Screwing: In the case of rotation in the direction of decreasing force, the suction valve 46 and the discharge valve 48 are moved away from each other, and the valve seats 56a, 56b of the suction valve 46 and the discharge valve 48 are
is separated from the suction valve mounting portion 45a and the discharge valve mounting portion 45b.

FIG. 3 is a structural diagram of a modification of the plunger pump 10 in which the valve device of FIG. 2 is installed. This plunger pump 1
0, the blind plug 70 is omitted, and the connecting nut 68 is inserted and removed from the opening on the cylinder body 20 side of the tip manifold 14 that occurs when the tip manifold 14 is separated from the cylinder body 20, and the connecting nut 68 is rotated. A tool for this purpose is also inserted into the manifold 14 through the opening.

FIG. 4 is a front view of a modified example of the valve device. Figures 1 to 3
In the illustrated suction valve 46 and discharge valve 48, valve seats 56a, 56
The outer circumferential surface of the valve seats 56a, 56b is formed into a straight, cylindrical side surface shape, but in the suction valve 46 and the discharge valve 48 shown in FIG.
72b. As shown in Figures 1 to 3, the valve seat 3
6a and 36b are the straight outer peripheral surface and the flange 65
a, 65b, the flange 65a +'
65b is the suction valve mounting part 45a and the discharge valve mounting part 45b
When the valve seat 56 is tightened, the tightening is finished to prevent over-tightening.
This makes it easier to process the outer peripheral surfaces of parts a and 56b. On the other hand, in the case of FIG. 4, the rotation of the connecting nut 68 in a predetermined direction causes the tapered portions 72a of the valve seats 56a, 56b to
72b can be tightened to the suction valve mounting part 45a and the discharge valve mounting part 45b, and the O-rings 66a and 66b on the outer peripheries of the valve seats 56a and 56b can be omitted.

FIG. 5 is a front view of still another modification of the valve device. The connecting shaft portions 52a, 52b are integrally formed with the connecting nut 68, and the connecting shaft portions 52a, 52b and the connecting nut 68 constitute one connecting shaft. Connecting shaft portion 52b and shaft portion 5
4a and 5'lb are formed separately and are connected by screwing. The nut 62a is threaded onto the connecting shaft portion 52a and the mandrel portion 54a at both ends, and is longer than the nut 62b. Connecting shaft portions 52a, 52b and nut 6
2a and the threaded portions with the mandrel portions 54a, 54b are opposite to each other, and by locking the tool tip to the connecting nut 68 and rotating the connecting shaft portions 52a, 52b, the connecting shaft portions 52a, 52b are cut. and nut 62a and stem portion 54
The amount of screw engagement with a and 54b increases or decreases, and the distance between the suction valve 46 and the discharge valve 48 increases or decreases. Note that the outer peripheries of the valve seats 56a and 56b may be formed straight.

6 is a front view of yet another modification of the valve device, and FIG. 7 is a perspective view of the valve seats 56a, 56b of FIG. 6.

In this modification, the valve seats 56a, 56b are connected to the stem portion 54.
a and 54b, and is connected to the shaft portion 54a by screwing.
, 54b. Since the valve seats 56a, 56b and the shaft portions 54a, 54b are separate bodies, machining of both becomes easy. In addition, as shown in FIGS. 1 to 4, the connecting shaft portions 52a, 52b and the shaft portions 54a, 54b
A suction valve 46 and a discharge valve 48 are integrally formed.
Also, the stem portions 54a, 54b and the valve seat 56a,
56b may be separate 1).

〔Effect of the invention〕

Thus, according to the invention, the suction valve and the discharge valve are
It is manufactured as an assembly in which the valve seat, valve body, stopper, etc. are attached to the stem, and the sack is omitted, which prevents deformation of the sack over time due to large loads applied to it, and prevents the suction. It is possible to avoid problems such as premature wear and functional deterioration of various parts of the valve and discharge valve.

Furthermore, if the connecting nut or connecting shaft is turned in one direction, the distance between the suction valve and the discharge valve increases, and the valve seats of the suction valve and the discharge valve can be detached from the suction valve mounting part and the discharge valve mounting part. Therefore, no special jig is required for replacing the O-ring on the valve seat, making replacement easy. Furthermore, by turning the connecting nut or the connecting shaft in the other direction, the distance between the suction valve and the discharge valve decreases, and the valve seats of the suction valve and the discharge valve can be pressed against the suction valve mounting part and the discharge valve mounting part. This makes it possible to ensure the tightness of the mounting part compared to the conventional mounting method using pressure using spigot fitting.

[Brief explanation of drawings]

Figures 1 to 7 relate to embodiments of the present invention, in which Figure 1 is a structural diagram of a plunger pump equipped with a valve device according to the present invention, Figure 2 is a front view of the valve device shown in Figure 1, and Figure 3. 2 is a structural diagram of a modification of the plunger pump incorporating the valve device shown in FIG. 2, and FIG. 4 is a front view of a modification of the valve device. 5 is a front view of still another modification of the valve device, FIG. 6 is a front view of still another modification of the valve device, and FIG. 7 is a perspective view of the valve seat of FIG. 6. FIG. 8 is a structural diagram of a plunger pump including a conventional valve device. 10... Plunger pump (reciprocating pump), 18.
... Pump chamber, 45a... Suction valve installation part. 45b...Discharge valve mounting part, 46...Suction valve. 48...Discharge valve, 52a, 52b...Connection shaft portion, 5
4a, 54b...mandrel part, 56a, 56b...31
Seat, 60a, 60b...stopper, 63a, 63b...
... Valve body, 64a, 64b ... Compression coil spring, 68
...Connection nut. 18...Pump chamber 45a...Suction valve device 11 part Sij45b...Discharge valve mounting part 62
a46... Suction valve Tsukuda... Discharge valve 56a, 56b... Valve ys 60a, 60b... Stopper 68... Connection nut Fig. 1 0a 4 Town Fig. 3 46 57a 7a 46 6th v! J Figure 8→S05SSA Procedure Ne Ichi Masan (Voluntary) July 1988 1O Director General of the Patent Office Mr. Kunio Ogawa ■, Indication of the Case 1988 Patent Application No. 146927 2, Invention Name of the valve device for a reciprocating pump 3, Relationship with the case of the person making the amendment Patent applicant name Maruyama Seisakusho Co., Ltd. 4 Column 6 of the detailed explanation of the invention in the attorney's specification, Contents of the amendment (as shown in the attached document) ) (6. Contents of the amendment) r 36a, 36b J in the it line of page 12 of the specification are changed to r 56a, 56b J as follows.

Claims (8)

[Claims] (1) The suction valve and the discharge valve are respectively arranged in the suction valve mounting part and the discharge valve mounting part of the pump chamber so that their center lines are on the same straight line, and the suction valve and the discharge valve are a stem portion, a valve seat that is fixed to the stem portion in the axial direction and is locked to the suction valve mounting portion and the discharge valve mounting portion by pressing in the axial direction; a stopper axially fixed to the mandrel at a remote position; a compression coil spring compressed between the valve seat and the stopper for biasing the valve body toward the valve seat; and a compression coil spring coupled to the mandrel. a connecting shaft portion protruding toward the discharge valve or the suction valve in the axial direction of the mandrel portion, and the threading directions at ends near each other of the connecting shaft portions are opposite to each other;
A valve device for a reciprocating pump, characterized in that a connecting nut is screwed into both the connecting shaft portions at both ends. (2) The valve device for a reciprocating pump according to claim 1, wherein the shaft portion and the connecting shaft portion are integrally formed or separate bodies. (3) The valve device for a reciprocating pump according to claim 1 or 2, wherein the stem portion and the valve seat are integrally formed or separate bodies. (4) The valve device for a reciprocating pump according to any one of claims 1 to 3, wherein the outer circumferential surface of the valve seat is tapered or straight. (5) The suction valve and the discharge valve are arranged in the suction, valve mounting part and discharge valve mounting part of the pump chamber, respectively, so that their center lines are on the same straight line, and the suction valve and the discharge valve are arranged on the same straight line. , a mandrel part, a valve seat that is fixed to the mandrel part in the axial direction and is locked to the suction valve mounting part and the discharge valve mounting part by pressing in the axial direction, and the valve seat in the axial direction of the mandrel part. a stopper axially fixed to the mandrel at a position away from the valve seat; and a compression coil spring compressed between the valve seat and the stopper to urge the valve body toward the valve seat, the connecting shaft being A valve device for a reciprocating pump, characterized in that both ends have threaded portions with different threading directions, and both ends of a connecting shaft are screwed into the suction valve and the discharge valve. (6) The valve device for a reciprocating pump according to claim 5, wherein the shaft portion and the connecting shaft portion are integrally formed or separate bodies. (7) The valve device for a reciprocating pump according to claim 5 or 6, wherein the stem portion and the valve seat are integrally formed or separate bodies. (8) The valve device for a reciprocating pump according to any one of claims 5 to 7, wherein the outer circumferential surface of the valve seat is tapered or straight.