Check valve

Abstract

The utility model discloses a check valve which comprises an upper shell, a lower shell and a valve element. The upper shell and the lower shell are casting parts, and the upper shell and the lower shell are fixedly connected in a sealed mode; the upper end of the valve element is movably inserted into the upper shell, and the lower end of the valve element is movably inserted into the lower shell. A sealing ring is formed in the lower shell, a sealing cover is formed on the lower portion of the valve element, and the sealing cover covers the sealing ring in an openable and closable mode. Compared with the prior art, the check valve has the advantages that the shell of the check valve is divided into the upper shell and the lower shell which are cast separately, so that the economical efficiency of product production is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of valves, and particularly to a check valve. Background Art

[0002] A check valve refers to a valve whose closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the action of the medium pressure. For example, in fire-fighting equipment, when the water supply stops, the pressure water flows back, and the water hammer effect caused by the sudden change in pressure is likely to cause the pump impeller and pump casing of the fire-fighting equipment to rupture, resulting in inoperability and delaying the fire extinguishing opportunity. Therefore, it is necessary to install a check valve to avoid the backflow problem. The existing check valve housing is integrally cast with a sand core. The casting mold cannot be reused and must be destroyed to obtain the finished product. Each production must re-model, and the integral modeling also greatly increases the cost of internal finishing. There are problems of low production efficiency, high processing cost, and poor economy.

[0003] In view of this, the inventor of the present invention has conducted in-depth research on the above-mentioned defects in the prior art, and thus this case has been produced. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a check valve, which has the advantages of convenient processing and high economy.

[0005] In order to achieve the above object, the solution of the utility model is:

[0006] A check valve, which includes an upper housing, a lower housing and a valve core; the upper housing and the lower housing are castings, and the upper housing and the lower housing are hermetically and fixedly connected; the upper end of the valve core is movably inserted into the upper housing, and the lower end of the valve core is movably inserted into the lower housing; a sealing ring is formed in the lower housing, a sealing cover is formed at the lower part of the valve core, and the sealing cover can be opened and closed on the sealing ring.

[0007] Further, a plurality of first mounting holes are formed at the edge of the lower end of the upper housing, and a second mounting hole corresponding to each first mounting hole is formed at the edge of the upper end of the lower housing. The first mounting hole and the second mounting hole are fixedly connected by bolts and nuts.

[0008] Further, a first thread is formed on the upper housing, and a second thread is formed on the lower housing. The upper housing and the lower housing are fixedly connected by threads.

[0009] Further, the upper housing has an annular connecting wall extending into the inner cavity of the lower housing. The first thread is an external thread formed on the annular connecting wall, and the second thread is an internal thread connected to the external thread.

[0010] A check valve as described above, wherein the connection between the upper housing and the lower housing is located at the maximum cross-sectional area of the valve cavity formed by the upper housing and the lower housing.

[0011] Furthermore, several first radial ribs are formed at the upper end of the upper housing, and a first sliding hole is formed at the intersection of the first radial ribs. The upper end of the valve core can be slidably inserted into the first sliding hole.

[0012] Furthermore, several second radial ribs are formed at the lower end of the lower housing, and a second sliding hole is formed at the intersection of the second radial ribs. The lower end of the valve core is slidably inserted into the second sliding hole.

[0013] Furthermore, a pre-tightening ring is formed on the valve core, and a pre-tightening spring is installed between the upper end of the pre-tightening ring and the lower end of the second radial rib.

[0014] After adopting the above structure, a check valve of the present invention has at least the following

[0015] Beneficial effects:

[0016] First, by separately providing the check valve housing as the upper housing and the lower housing, it is not necessary to break the sand core to take out the complete product during casting, which greatly reduces the production cost and improves the production efficiency.

[0017] Second, when the water flow moves from the lower housing towards the upper housing, the sealing cover is pushed open by the water flow and moves away from the sealing ring, and at this time the water flow can flow normally; when the water flow moves from the upper housing towards the lower housing, the sealing cover will abut against the sealing ring, and the water flow is blocked by the sealing cover and cannot flow, so the reverse flow of the water flow can be blocked.

[0018] Third, the integral forming of the radial ribs and the housing can further improve the production efficiency and reduce the production cost.

[0019] Compared with the prior art, by a check valve of the present invention, the check valve housing is separately cast as the upper housing and the lower housing, which greatly improves the economic efficiency of product production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional view of a check valve related to the present invention.

[0021] Figure 2 It is a cross-sectional view of a check valve related to the present invention.

[0022] Figure 3 It is an exploded view of a check valve related to the present invention.

[0023] Figure 4 It is a cross-sectional view of a check valve in another embodiment.

[0024] Figure 5 This is an exploded view of the check valve from another angle in the present utility model.

[0025] In the figure:

[0026] Upper housing 1, lower housing 2, valve core 3,

[0027] First mounting hole 11, first radial rib 12, first sliding hole 13,

[0028] First thread 14, annular connecting wall 15,

[0029] Sealing ring 21, second mounting hole 22, second radial rib 23,

[0030] Second sliding hole 24, second thread 25,

[0031] Sealing cover 31, pre-tightening ring 32, pre-tightening spring 33. Specific embodiments

[0032] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail below through specific embodiments.

[0033] As Figures 1 to 5 shown, it is a check valve related to the present utility model, including an upper housing 1, a lower housing 2 and a valve core 3; the upper housing 1 and the lower housing 2 are castings, and the upper housing 1 and the lower housing 2 are hermetically and fixedly connected; the upper end of the valve core 3 is movably inserted into the upper housing 1, and the lower end of the valve core 3 is movably inserted into the lower housing 2; a sealing ring 21 is formed inside the lower housing 2, a sealing cover 31 is formed at the lower part of the valve core 3, and the sealing cover 31 can be opened and closed to cover the sealing ring 21. By separately arranging the check valve housing into the upper housing 1 and the lower housing 2, the sand core does not need to be broken to take out the complete product during casting, greatly reducing the production cost and improving the production efficiency. When the water flow flows from the lower housing 2 towards the upper housing 1, the sealing cover 31 is pushed open by the water flow and moves away from the sealing ring 21, and at this time the water flow can flow normally; when the water flow flows from the upper housing 1 towards the lower housing 2, the sealing cover 31 will abut against the sealing ring 21, and the water flow is blocked by the sealing cover 31 and cannot flow, so the reverse flow of the water flow can be blocked.

[0034] Preferably, a plurality of first mounting holes 11 are formed at the lower edge of the upper housing 1, and second mounting holes 22 corresponding to the first mounting holes 11 one by one are formed at the upper edge of the lower housing 2. The first mounting holes 11 and the second mounting holes 22 are fixedly connected by bolts and nuts. In addition, as Figure 4 and Figure 5As shown, in another embodiment, a first thread 14 is formed on the upper housing, and a second thread 25 is formed on the lower housing. The upper housing 1 and the lower housing 2 are fixedly connected by threads. In addition, the upper housing 1 has an annular connecting wall 15 extending into the inner cavity of the lower housing 2. The first thread 14 is an external thread formed on the annular connecting wall 15, and the second thread 25 is an internal thread connected to the external thread.

[0035] Preferably, the connection between the upper housing 1 and the lower housing 2 is located at the maximum cross-sectional area of the valve cavity formed by the upper housing 1 and the lower housing 2. This is more convenient for separating the casting from the mold during the casting process.

[0036] Preferably, as Figure 3 As shown, a number of first radial ribs 12 are formed at the upper end of the upper housing 1, and a first sliding hole 13 is formed at the intersection of the first radial ribs 12. The upper end of the valve core 3 is slidably inserted into the first sliding hole 13. A number of second radial ribs 23 are formed at the lower end of the lower housing 2, and a second sliding hole 24 is formed at the intersection of the second radial ribs 23. The lower end of the valve core 3 is slidably inserted into the second sliding hole 24. In this way, the integral forming of the radial ribs and the housing can further improve the production efficiency and reduce the production cost.

[0037] Preferably, a pre-tightening ring 32 is further formed on the valve core 3, and a pre-tightening spring 33 is installed between the upper end of the pre-tightening ring 32 and the lower end of the second radial rib 23. This can automatically close the valve under the condition of unloading, avoid reverse flow, and effectively prevent the impact of water hammer.

[0038] Compared with the prior art, the present utility model divides the check valve housing into the upper housing 1 and the lower housing 2 for separate casting through a check valve, which greatly improves the economy of product production.

[0039] The above embodiments and drawings do not limit the product form and style of the present utility model. Any appropriate changes or modifications made by those of ordinary skill in the art shall be regarded as not departing from the patent scope of the present utility model.

Claims

1. A check valve, characterized in that: It includes an upper shell, a lower shell and a valve core; the upper shell and the lower shell are castings, and the upper shell and the lower shell are sealed and fixedly connected; the upper end of the valve core can be movably inserted in the upper shell, and the lower end of the valve core can be movably inserted in the lower shell; a sealing ring is formed in the lower shell, and a sealing cover is formed at the lower part of the valve core, and the sealing cover can be opened and closed and covered on the sealing ring.

2. A check valve according to claim 1, characterized in that: A plurality of first mounting holes are formed on the lower edge of the upper shell, and a second mounting hole corresponding to the first mounting holes is formed on the upper edge of the lower shell; the first mounting hole and the second mounting hole are fixedly connected by bolts and nuts.

3. A check valve according to claim 1, characterized in that: The upper shell is formed with a first thread, the lower shell is formed with a second thread, and the upper shell and the lower shell are fixedly connected via the thread.

4. A check valve as claimed in claim 3, characterized in that: The upper shell has an annular connecting wall extending into the inner cavity of the lower shell, the first thread is an external thread formed on the annular connecting wall, and the second thread is an internal thread connected to the external thread.

5. A check valve according to any one of claims 1 to 4, characterized in that: The connection point between the upper shell and the lower shell is located at the maximum cross section of the valve cavity formed by the upper shell and the lower shell.

6. A check valve according to claim 1, characterized in that: A plurality of first radiation ribs are formed at the upper end of the upper shell, and a first sliding hole is formed at the intersection of the first radiation ribs. The upper end of the valve core can be slidably inserted in the first sliding hole.

7. A check valve according to claim 1, characterized in that: A plurality of second radiation ribs are formed at the lower end of the lower shell body, a second sliding hole is formed at the intersection of the second radiation ribs, and the lower end of the valve core is slidably inserted in the second sliding hole.

8. A check valve according to claim 7, characterized in that: A pre-tightening ring is also formed on the valve core, and pre-tightening springs are installed at the upper end of the pre-tightening ring and the lower end of the second radiation rib.

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