Rotary positive displacement pump with a guard

A rotary positive displacement pump for pumping a fluid product, the pump having a front side and a rear side and comprising:

• a transmission housing having an axial front wall and an axial rear wall and providing rotational support to first and second parallel and axially extending drive shafts having gears in constant mesh condition, such that the first and second drive shafts are arranged to rotate in opposite directions, and
• a rotor casing connected to a front side of the transmission housing and having an axial rear wall, an axial front wall and a circumferential side wall jointly defining a stationary interior pumping cavity,
• wherein the rotor casing houses a first rotor that is drivingly connected to the first drive shaft and a second rotor that is drivingly connected to the second drive shaft,
• wherein the first and second rotors are configured for rotating in opposite directions and mutually interacting for providing a positive pumping effect on a fluid product that enters the pumping cavity via a rotor casing inlet and exits the pumping cavity via a rotor casing outlet,
• wherein the axial front wall of the transmission housing and the axial rear wall of the rotor casing jointly define an intermediate space through which the first and second drive shafts extend, and
• wherein the rotary positive displacement pump further comprises:
• a first guard located in said intermediate space and surrounding the first and second drive shafts for protecting a person from contacting the first and second drive shafts, or
• a first guard located in said intermediate space and surrounding the first drive shaft for protecting a person from contacting the first drive shaft, and a second guard located in said intermediate space and surrounding the second drive shaft for protecting a person from contacting the second drive shaft,
• wherein the rotary positive displacement pump further comprises a first outer end plate for securing a roller bearing of the first drive shaft to the transmission housing, and a second outer end plate for securing a roller bearing of the second drive shaft to the transmission housing, wherein said first and second outer end plates are attached to the transmission housing by fastening members used for attaching the first guard, or the first and second guards, to the transmission housing.

A rotary positive displacement pump for pumping a fluid product, the pump having a front side and a rear side and comprising:

• a transmission housing having an axial front wall and an axial rear wall and providing rotational support to first and second parallel and axially extending drive shafts having gears in constant mesh condition, such that the first and second drive shafts are arranged to rotate in opposite directions, and
• a rotor casing connected to a front side of the transmission housing and having an axial rear wall, an axial front wall and a circumferential side wall jointly defining a stationary interior pumping cavity,
• wherein the rotor casing houses a first rotor that is drivingly connected to the first drive shaft and a second rotor that is drivingly connected to the second drive shaft,
• wherein the first and second rotors are configured for rotating in opposite directions and mutually interacting for providing a positive pumping effect on a fluid product that enters the pumping cavity via a rotor casing inlet and exits the pumping cavity via a rotor casing outlet,
• wherein the axial front wall of the transmission housing and the axial rear wall of the rotor casing jointly define an intermediate space through which the first and second drive shafts extend, and
• wherein the rotary positive displacement pump further comprises:
• a first guard located in said intermediate space and surrounding the first and second drive shafts for protecting a person from contacting the first and second drive shafts, or
• a first guard located in said intermediate space and surrounding the first drive shaft for protecting a person from contacting the first drive shaft, and a second guard located in said intermediate space and surrounding the second drive shaft for protecting a person from contacting the second drive shaft
• wherein a protective body of the first guard, or each of the first and second guards, comprises recesses and/or through holes for enabling improved visibility of the first drive shaft or first and second drive shafts, and for enabling improved detection of leakage of a fluid product and/or transmission oil at a drive shaft seal associated with the first guard, or any of the first and second guards.

A rotary positive displacement pump for pumping a fluid product, the pump having a front side and a rear side and comprising:

• a transmission housing having an axial front wall and an axial rear wall and providing rotational support to first and second parallel and axially extending drive shafts having gears in constant mesh condition, such that the first and second drive shafts are arranged to rotate in opposite directions;
• a rotor casing connected to a front side of the transmission housing and having an axial rear wall, an axial front wall and a circumferential side wall jointly defining a stationary interior pumping cavity;
• the transmission housing including an attachment portion that projects away from the axial front wall in a forward direction and terminates at a forward end of the attachment portion;
• the rotor casing housing a first rotor that is drivingly connected to the first drive shaft and a second rotor that is drivingly connected to the second drive shaft;
• the first and second rotors being configured for rotating in opposite directions and mutually interacting for providing a positive pumping effect on a fluid product that enters the pumping cavity via a rotor casing inlet and exits the pumping cavity via a rotor casing outlet;
• the axial front wall of the transmission housing and the axial rear wall of the rotor casing jointly defining an intermediate space through which the first and second drive shafts extend;
• and
• the rotary positive displacement pump further comprising a guard located in the intermediate space and surrounding the first drive shaft to protect a person from contacting the first drive shaft, the guard having a forward end and a rear end, the rear end of the guard being closer to the axial front wall of the transmission housing than the forward end of the guard, the forward end of the attachment portion being positioned forward of the forward end of the guard in the forward direction so that the forward end of the attachment portion is closer to the axial rear wall of the rotor casing than the forward end of the guard.

A rotary positive displacement pump for pumping a fluid product, the pump having a front side and a rear side and comprising:

• a transmission housing having an axial front wall and an axial rear wall and providing rotational support to first and second parallel and axially extending drive shafts having gears in constant mesh condition, such that the first and second drive shafts are arranged to rotate in opposite directions, and
• a rotor casing connected to a front side of the transmission housing and having an axial rear wall, an axial front wall and a circumferential side wall jointly defining a stationary interior pumping cavity,
• wherein the rotor casing houses a first rotor that is drivingly connected to the first drive shaft and a second rotor that is drivingly connected to the second drive shaft,
• wherein the first and second rotors are configured for rotating in opposite directions and mutually interacting for providing a positive pumping effect on a fluid product that enters the pumping cavity via a rotor casing inlet and exits the pumping cavity via a rotor casing outlet,
• wherein the axial front wall of the transmission housing and the axial rear wall of the rotor casing jointly define an intermediate space through which the first and second drive shafts extend;
• and
• a guard located in the intermediate space and surrounding the first drive shaft to protect a person from contacting the first drive shaft, the guard being separate from the transmission housing and being fastened to the transmission housing by a fastener that is separate from the guard and the transmission housing and that engages both a part of the guard as well as a part of the transmission housing.