US3072069A

US3072069A - Circulating pump arrangements, more especially for central heating systems

Info

Publication number: US3072069A
Application number: US858222A
Authority: US
Inventors: Wittwer Edouard
Original assignee: Individual
Current assignee: Individual
Priority date: 1958-12-09
Filing date: 1959-12-08
Publication date: 1963-01-08
Anticipated expiration: 1980-01-08

Description

FOR

E. WITTWER ING PUMP ARRANGEMENTS, MORE ING SYSTEMS CENTRAL HEAT Filed D 8, 1959 3,072,069 ESPECIALLY IIA Uited States Patent Ofificc 3,d72,069 Patented Jan. 8, 1963 This invention relates to circulating pump installations, more especially for central heating systems.

The fact that there is always a quantity of dirt in heating sysems continually leads to faults in the mechanical parts of circulating pumps of the type having no glands.

The correct installation of a circulating pump comprises a circulating line with a pump and a slide-valve both in front of and after the pump, and a throttle valve in the main line or, instead of this, a non-return valve which open or can be opened immediately the pump breaks down or has to be repaired.

This type of construction is expensive and is avoided today, especially in small heating systems, owing to the cost. In small heating systems, the pump is usually installed directly in the flow or return line, the provision of shut-cit means in front of and after the pump frequently being dispensed with and thus the disadvantage of having to empty and re-fill the heating system in the event of repairs has to be accepted. This procedure in the event of a repair, however, is usually much more expensive than the repair to the pump itself.

When the pump is installed together with shut-oil means directly in the flow or return line, there is a danger that one of these shut-oft means may be closed by an unqualified person, so that the steam forming in the boiler results in undesirable damage, especially when coke is used for firing. V

The object of the present invention is to incorporate a shut-off means directly in the pump itself, which shut-off means cannot be closed as long as the pump is installed. On the other hand, the shut-off means is to close automatically if the pump is removed for repair purposes.

To this end, according to the invention, the region of the liquid a shut-oft meansis provided which is operatively connected to the circulating pump elements in such manner that when the pump is removed the shut-01f means automatically pass into the closing position.

One exemplified embodiment of the subject of the invention is illustrated in. section in the accompanying drawing.

On the motor shaft 1 of the circulating pump, the rotor 2 is mounted at one end and the impeller 3' at the other end. The motor further comprises the stator 4, the shield and shaft bearing 5, the separating bush 6 between the rotor 2 and the stator 4, and the motor casing 7. The shaft bearing is flanged on the casing 7, which is in turn bolted to the housing 9 by means of the bolts 8. In the housing 9 there is a cylindrical bore 10, into which lead the inlet 11 and the outlet 12 of the medium to be circulated. The cylinder 13'is mounted in the bore til so as to be axially slidable and hasinlet apertures Maud outlet apertures 15, which are connected to one another. The impeller 3 is situated in front of the outlet apertures. Between the wall of the bore and the cylinder are disposed the sealing rings 16, 17 and 18. The compression spring 19 presses the cylinder 13 toward the bearing 5.

The drawing illustrates the installed position. For the purpose of removing the pump, the bolts 8 are released, so that the bearing body 5 together with the motor and impeller can be removed from the housing 9. In these circumstances, the cylinder 13 is pushed by the spring 19 until it strikes against the stop 20. The sealing rings also slide with the cylinder, and the ring 16 reaches the position of the ring 17, the ring 17 the position of the ring 18, and the ring 18 the position 2E. The ring 16 thus seals oif the inlet and the rings 17 and 18 seal off the outlet or return branch. The pump can now be removed without any danger of the circulating medium continuing to flow in. On removal, the circulating medium situated in the cylinder 13 flows out and is lost as' 1. A circulating pump comprising a casing defining an interior chamber, fluid-inlet channel means intersecting,

said chamber, fiuid-outlet channel means intersecting said chamber, fluid circulating means removably mounted in said chamber for forcing fluid from said fluid-inlet channel means to said fluid-outlet channel means, valve means located in said chamber including a valve member and biasing means for urging said valve member into engagement with said circulating means, said valve member being mounted in said chamber for movement by sa1d biasing means in response to removal of said circulat ng means from a first position allowing flow of fluid between said channel means and said chamber to a second posi-' tion obstructing fluid flow between each of said channel means and said chamber; and stop means mounted on,

said casing and projecting into the interior thereof for stopping movement of said valve member in response to the urging of said biasing means when said circulating means has been removed from said chamber, said valve member having a pair of passages leading to said circulat H ing means, said passages each being in alignment with one ,of said channel means for allowing fluid flow between said inlet channel means and said outlet channel means when said circulating means is in the first position, and being moved out of alignment upon said circulating means being removed.

2. A circulating pump comprising a casing defining an interior chamber having walls, fluid-inlet channel means passing to said chamber, fluid-outlet channel means passing from said chamber, fluid circulating means removably mounted in said chamber for forcing fluid from said fluidinlet channel means to said fluid-outlet channel means, valve means located in said chamber including a valve member havinga surface corresponding to the shape of the interior walls and biasing means urging said member into engagement with said circulating means, said member being mounted for movement during removal of said circulating means from a first position allowing flow of fluid between said channel means and said chamber to a second position obstructing fluid flow between each of said channel means and said chamber; and stop means mounted on said casing and projecting into the interior thereof for stopping movement of said valve member in response to the urging of said biasing means when said circulating means is removed from said chamber, said valve member having a pair of passages leading to said circulating means, said passages each being in alignment with one of said channel means for allowing fluid flow between said inlet channel means and said outlet channel means when said circulating means is in the first position and being moved out of alignment upon said circulating means being removed, said valve means including packing means mounted around said valve member and in engagement with the interior walls of said casing.

3. A circulating pump comprising a casing defining a cylindrical interior chamber having cylindrical interior walls, radially arranged fluid-inlet channel means inter secting said chamber at one axial position, radially arranged fluid-outlet channel means intersecting said chamber at a second axial position, fluid circulating means mounted in said chamber and adapted to be removable by axial movement with respect to said chamber for forcing fluid from said fluid-inlet channel means to said fluidoiitlet channel means when mounted in said chamber, and valve means located in said chamber including a cylindrical valve member axially movable within the cylindrical walls of said casing and biasing means for axially biasing said valve member against said circulating means when said circulating means is mounted within the housing; said valve member being moved, upon removal of said circulating means, from a first axial position allowing flow of fluid between said channel means and said chamber to a second position into the path of each of said channel means for obstructing fluid flow between each of said channel means and said chamber, and stop means for stopping the movement of said valve member by the urging of said biasing means when said circulating means is removed.

4. A circulating pump comprising a casing defining a cylindrical interior chamber and cylindrical interior walls, radially arranged fluid-inlet channel means intersecting said chamber, radially arranged fluid-outlet channel means intersecting said chamber at a location axially offset from said fluid-inlet channel means, fluid circulating means mounted in said chamber and adapted to be removable by axial movement thereof with respect to said chamber for forcing fluid from said fluid-inlet channel means to said fluid-outlet channel means when mounted in said chamber, and valve means located in said chamber including a cylindrical valve member axially movable within the cylindrical wallsof said casing and biasing means for axially biasing said valve member against said circulating means when said circulating means is mounted within the housing; said valve member being moved, upon removal of said circulating means, from a first axial position allowing free flow of fluid between said channel means and said chamber to a second axial position obstructing fluid flow between each of said channel means and said chamber, and stop means for stopping the movement of said valve member resulting from the urging of said biasing means when said circulating means is removed; said valve member having a pair of passages leading to said circulating means, said passages each being in alignment with one of said channel means for allowing fluid flow between said inlet and said outlet means when said valve member is in the first position and being moved out of alignment therewith upon said circulating means being removed.

5. A circulating pump comprising a casing defining a cylindrical interior chamber having cylindrical interior walls, radially arranged fluid-inlet channel means intersectingsaid chamber at an axial location offset from said fluid-inlet channel means, radially arranged fluid-outlet "channel means intersecting said chamber, fluid circulating means mounted in said chamber-and adapted'to be removable by axial movement thereof with respect to said chamber for forcing fluid from said fluid-inlet channel means to said fluid-outlet channel means when mounted in said chamber, valve means located in said chamber, a cylindrical valve member axially movable within the cylindrical walls of said casing and biasing means for axially biasing said valve member against said circulating means when said circulating means is mounted within the casing; said valve member being mounted for movement upon removal of said circulating means from a first axial position allowing flow of fluid between said channel means and said chamber to a second axial position obstructing fluid flow between each of said channel means and said chamber, and stop means for stopping the axial movement of said valve member by the urging of said biasing means when said circulating means is removed, said valve member having a pair of passages leading to said circulating means, said passages each being in alignment with one of said channel means for allowing fluid flow between said inlet and said outlet means when valve member is in the first position and being moved out of alignment therewith when said circulating means has been removed, said valve means including a plurality of annular packing rings mounted about the cylindrical walls of said valve member and in engagement with the interior walls of said casing for preventing flow about said valve member and restricting flow to the passages within said valve member.

6. A circulating pump comprising a casing defining an interior chamber and cylindrical interior Walls, radially arranged fluid-inlet channel means passing to said chamber at a first axial location, radially arranged fluid-outlet channel means passing from said chamber at a second axial location, fluid circulating means mounted in said chamber and adapted to be removable by axial movement thereof with respect to said chamber for forcing fluid from said inlet channel means to said outlet channel means when mounted in said chamber, valve means located in said chamber including a cylindrical valve member coaxially movable within the cylindrical walls of said casing and biasing means for axially urging said valve member against said circulating means when said circulating means is mounted within the casing; said valve member being mounted for movement, upon removal of said circulating means, from a first axial position allowing flow of fluid between said channel means and said chamber to a second position for obstructing fluid flow between each of said channel means and said chamber, and stop means for stopping the movement of said valve member by the urging of said biasing means when said circulating means is removed, said valve member having a pair of passages leading to said circulating means, said passages each be ing in alignment with one of said channel means for allowing fluid flow between each of said channel means when said valve member is in the first position and out of alignment when said circulating means is removed, said valve means including a pair of packing rings mounted about said valve member and in engagement with the Walls of said housing at axial positions on either side of said fluid-inlet channel means, and a third packing ring mounted about said valve member and in en gagement with the interior walls of said casing on the side of said fluid-outlet channel means adjacent to the pair of packing rings, whereby upon said valve member being moved to the second position said third ring and one of said pair of rings straddles said fluid-outlet channel means and the other of said pair of rings is moved to the other axial side of said fluid-inlet channel means.

References Cited in the file of this patent UNITED STATES PATENTS 2,384,254 Meredew Sept. 4, 1945 2,420,315 Holt et al May 13, 1947 2,901,889 Reed Sept. 1, 1959 2,978,150 Doelcher Apr. 4, 1961

Claims

1. A CIRCULATING PUMP COMPRISING A CASING DEFINING AN INTERIOR CHAMBER, FLUID-INLET CHANNEL MEANS INTERSECTING SAID CHAMBER, FLUID-OUTLET CHANNEL MEANS INTERSECTING SAID CHAMBER, FLUID CIRCULATING MEANS REMOVABLY MOUNTED IN SAID CHAMBER FOR FORCING FLUID FROM SAID FLUID-INLET CHANNEL MEANS TO SAID FLUID-OUTLET CHANNEL MEANS, VALVE MEANS LOCATED IN SAID CHAMBER INCLUDING A VALVE MEMBER AND BIASING MEANS FOR URGING SAID VALVE MEMBER INTO ENGAGEMENT WITH SAID CIRCULATING MEANS, SAID VALVE MEMBER BEING MOUNTED IN SAID CHAMBER FOR MOVEMENT BY SAID BIASING MEANS IN RESPONSE TO REMOVAL OF SAID CIRCULATING MEANS FROM A FIRST POSITION ALLOWING FLOW OF FLUID BETWEEN SAID CHANNEL MEANS AND SAID CHAMBER TO A SECOND POSITION OBSTRUCTING FLUID FLOW BETWEEN EACH OF SAID CHANNEL MEANS AND SAID CHAMBER, AND STOP MEANS MOUNTED ON SAID CASING AND PROJECTING INTO THE INTERIOR THEREOF FOR STOPPING MOVEMENT OF SAID VALVE MEMBER IN RESPONSE TO THE URGING OF SAID BIASING MEANS WHEN SAID CIRCULATING MEANS HAS BEEN REMOVED FROM SAID CHAMBER, SAID VALVE MEMBER HAVING A PAIR OF PASSAGES LEADING TO SAID CIRCULATING MEANS, SAID PASSAGES EACH BEING IN ALIGNMENT WITH ONE OF SAID CHANNEL MEANS FOR ALLOWING FLUID FLOW BETWEEN SAID INLET CHANNEL MEANS AND SAID OUTLET CHANNEL MEANS WHEN SAID CIRCULATING MEANS IS IN THE FIRST POSITION, AND BEING MOVED OUT OF ALIGNMENT UPON SAID CIRCULATING MEANS BEING REMOVED.