Casing for preventing distortion and pump including the same

1. A casing of a pump comprising:

a metal member configured to have at least two sub metal members;

a body; and

a liner,

wherein the sub metal members are included in the body, the body is formed of plastic, the sub metal members surround the liner, a fluid flow space through which fluid flows is formed in the liner,

wherein the liner includes a liner body member, a liner flange member and a liner connection member for connecting the liner body member to the liner flange member,

wherein at least one of the sub metal members includes a sub metal body member, a sub metal flange member and a sub metal connection member for connecting the sub metal body member to the sub metal flange member,

wherein the body includes a body member, a body flange member and a body connection member for connecting the body member to the body flange member, and

wherein a width of the sub metal flange member is higher than a width of the liner flange member, and the sub metal flange member surrounds the liner connection member while the sub metal flange member is beneath the liner flange member.

2. The casing of claim 1 , wherein the liner flange member, the sub metal flange member and the body flange member form one flange, and the one flange is combined with a flange of a piping.

3. The casing of claim 1 , wherein at least one first hole into which a fixing member is inserted and at least one second hole in which melted plastic is filled during an insert molding is formed on the sub metal flange member.

4. The casing of claim 1 , wherein the sub metal members surround the liner, the sub metal flange member has a shape of torus cut by half, and a groove curve line of the sub metal flange member covers a part of the liner body member.

5. The casing of claim 1 , further comprising:

a supporting member,

wherein the supporting member includes a metal supporting member longitudinally extended from one of the sub metal members and a plastic supporting member for covering the metal supporting member,

the metal supporting member is formed together with corresponding sub metal member, and the plastic supporting member is formed on the metal supporting member through an insert molding.

6. A casing of a pump comprising:

a metal member; and

a body formed of plastic,

wherein at least one hole in which melted plastic is filled is formed on the metal member, and the metal member is included in the body through an insert molding,

at least one another hole through which a fixing member is inserted is further formed on the metal member, and

the fixing member is inserted into a hole formed on a flange member of a piping, a hole formed on a flange of the body and the one another hole of the metal member.

7. The casing of claim 6 , further comprising:

a liner disposed in the metal member,

wherein the metal member includes two sub metal members,

one of the sub metal members surrounds a part of the liner, and other sub metal member surrounds other part of the body.

8. A method of manufacturing a casing of a pump, the method comprising:

surrounding an integral liner with sub metal members; and

inserting a structure where the sub metal members surround the liner in melted plastic, so that the sub metal members are included in a body formed of plastic,

wherein each of the sub metal members includes a sub metal body member, a sub metal flange member and a sub metal connection member for connecting the sub metal body member to the sub metal flange member, and

wherein at least one hole in which the melt plastic is filled is formed on each of the sub metal flange members.