REGULATOR

Abstract: Regulator in a motor driven pump for the regulation of the output pressure according to a predetermined value. An automatically functioning reliable regulation according to a predetermined value in order to impede cavitation and reduce the risk of an interrupted flow of liquid in the pump is provided by means of the invention. This is made possible by means of a double diaphragm (12) via a preferably spring biased transmission means (4, 10) of movement being in connection with a controlling means serving the purpose to control the capacity of the power source of the pump and with a space (27) between the diaphragm elements (12A, 12B) of said double diaphragm (12) being connected with the output pressure (30) from the pump for the actuation of the double diaphragm (12) in order to adjust the controlling means of the capacity in a desired degree, and increased or decreased fluid output from the pump bringing about a displacement of the double diaphragm (12) to its maximum position (Fig. 4) or minimum position (Fig. 5) respectively.

Description: Regulator The present invention relates to a regu¬ lator in a motor driven pump for the regulation of the output pressure according to a predetermined value. It is a principal object of the present invention to provide a regulator of the kind mentioned above, which automatically and reliably regulates the output pressure according to a previously adjusted value by way of example in connection with an increase or a re¬ duction respectively of the output flow from the pump, among other things in order to prevent cavitation and to reduce the risk of an interruption of the flow of the li¬ quid in the pump. It is an additional object of the invention to throttle the gas to. the motor of the pump to a minimum automatically, when there is an interruption in the supply of fluid. Regulators of the prior art function either electronically or by means of pistons. Such constructions are complicated and exhibit great dimensions. The objects of the invention are obtained by means of a regulator according to the present invention, which is substantially characterized by a main valve arrang ment, preferably a double diaphragm, via a preferably sprin biassed transmission means of movement being in connection with a control mechanism serving the purpose-to regulate the capacity of the pump, and by means of a chamber, which is defined by or bordering upon said main valve arrangement, being connected with the output pressure from the pump in order to actuate said main valve arrangement, so that the adjustment of the control mechanism of the pump capacity in a desired degree can be made, an increased or reduced, respectively, fluid output from the pump causing a displace¬ ment of the main valve arrangement against the maximum and the minimum position respectively of the same. -BJREAIΓ 0MPI The invention is described in the follow¬ ing, reference being made to the accompanying drawings, in which Fig. 1 is a partly sectional perspective view of a regulator designed according to the invention. Fig. 2 shows the regulator in another sec¬ tional view. Fig. 3 is a perspective view of the regula¬ tor, Fig. 4 is a schematical view showing the regulator in a first position. Fig. 5 shows the regulator in a second posi¬ tion, Fig. 6 shows the regulator in a third posi- tion, and Fig. 7 shows an additional embodiment of a regulator. The regulato ' r, which in the first place is intended to find an application in pumps working^ with a liquid, exhibits a regulator housing, which in the drawings is indicated with the digit 1„* Said regulator housing 1 is formed by a number of housing parts 1A, IB, 1C and ID respectively, which are coupled together and exhibit a num¬ ber of recesses 2A, 2B etc., which in not connected condi- tion of the parts 1A-1D are open and located right in front of each other in order to form a number of cha bers 2 etc. and spaces, the function of which will be explained further on. .The housing 1 exhibits a preferably angular arm 4, which is pivoted on a shaft 5, which is supported by a fastening means 6 on the housing 1. Said arm 4 by the bias of a spring 7 tends with one angular arm portion 4A to be moved in direction towards the housing 1, while at the same time it is abutting against one end 8A of a piston rod 8, which through an opening 9 protrudes out of the housing 1. OMPI The other angular arm portion 4B of the pivoting arm 4 is connected with the regulator of the capacity (the throttle control) of the propulsion means of the pump, i.e. the motor, said, connection by way of example comprising a wire 10 or other similar transmission means. The spring biassed piston rod 8 through the opening 9 penetrates into a space 11, which extends through the three housing parts IB, 1C and ID, and in the interspace ' between the same clamps two diaphragm elements 12A and 12B respectively, which together form a double diaphragm 12. This double diaphragm 12 is by means of the end portion 8B of the piston rod 8, that penetrates into the housing, and a nut 13 and with an interspaced spacer block 14 connec ed with the piston rod 8, as is shown i Fig. 2 in the draw ing. The element 12A, which is one of the two elements 12A and 12B respectively of the double diaphragm, is held neare to the end 8B of the piston rod 8, which is penetrating int the housing 1, and exhibits a considerably greater. rea tha the other element 12B of said two elements of thfe double diaphragm, the relation preferably being in the order of 4:1 as a condition for the satisfactory function of the regulator. The space 15, upon which the smaller one 12B of the two elements 12A and 12B respectively of the double. diaphragm borders, exhibits a passage to the surrounding ambient, i.e. this space 15 is under atmospheric pressure. The other space 16, which forms a chamber 16 denominated the "first chamber", is via a duct in communication with an additional chamber 18 denominated the "middle chamber". Sai middle chamber 18 is in its turn via an additional duct 19 in communication with a space 20, in which a mushroom valve body 21 or similar can be displaced. A ball valve body 22 which together with sai mushroom valve body 21 forms the other controllable part in a secondary valve arrangement, can by means of a pressure spring 23 be pressed against an opening 24 between said O PI mushroom valve space 20 and a chamber 25, which receives the ball valve body 22, said chamber 25 in one direction via a duct 26 debouching in the space 27 formed between the two elements 12A and 12B respectively of the double diaphragm 12 and in the other direction via an additional duct 28 debouching in a hose connection 29, which holds the end of the hose 30 departing from the pump, said hose 30 being connected with the pressure side of the pump for sensing the output pressure of the same. An additional hose 31, which is connected with the pump at its suction side, is via a hose connection 32 connected with an addi¬ tional input passage 33, which debouches in the chamber denominated the "second chamber", and which is the same one as the chamber, which above has been indicated with 2, in which a diaphragm 34 is clamped on a piston 35, the piston rod 36 of which projects out of the housing 1. A boss 35A is provided.on the piston 35 and is intended to be able to co-operate with a bottom portion of the chamber 2. The one part of the chamber 2, which fis located on the upper side of the diaphragm 34, is via a passage 37 in communication with the surrounding atmosphere. A pressure spring 38 abuts with one end 38A against the upper portion of the piston rod.36, on which a swinging arm 39 is pivoted with one end 39A. The other end 39B of the swinging arm 39 is via an articulation 40 pivoted on a regulating pin 41 connected with the valve body 21 and protruding out of the housing 1. The swinging arm 39 exhibits a shaft 42 ex¬ tending across the -arm 39 and at each one of its respective two ends supporting an angled arm 43 and 44 respectively, which are rigidly connected with said shaft 42, each one of said angled arms being pivoted on its upright 45 and 46 respectively projecting in upwards direction from the hous¬ ing 1. A helical spring 47 * is with one end 47A con¬ nected with the shaft 42. The other end 47B of the spring 47 -BUR t Al OMPI is in its turn connected with one side 48A of the angle of an angular part 48 pivoted on a shaft 49 in the hous¬ ing. The other side 48B of the angle of the angular part 48 is pivoted on one end 50A of a shaft 50 provided with threads and screwed into a threaded hole 5OB of the hous¬ ing 1. A wheel 51 is rigidly connected with said shaft 50, which is provided with threads, at the protruding end 50C of the same and forms a throttling means, by means of which the supporting point of the spring 47 can be changed and thereby adjust the spring 47, so that it will have the desired spring force. The shaft 42 abuts with one portion 42C against the upper end 52A of an additional shaft 52, which through an opening 53 penetrates into the housing 1 and enters the chamber, which is above denominated the "middle chamber" and -has been indicated with the digit 18 above. A diaphragm 54,. which by means of a supporting part 52B and nuts 55 is supported on the shaft 52, is connected with said shaft 52, which exhibits a bottom portfion 52C forming a boss 52C, which is intended to be able to co¬ operate with a bottom portion of the chamber 18. The dia¬ phragm 54, which is clamped between the housing parts 1 and 2, divides the chamber 18 in a bottom chamber 18 and an upper chamber 56, which upper chamber 56 is in communica tion with the atmosphere via a duct 57. The function of the regulator described abov will now be explained more in detail starting with the case arising in connection with an increased fluid output from the pump, reference in the first place being made to ' Fig. 4 in the drawings. The output pressure from the pump is then somewhat reduced, which fall of pressure is transmitted to the space 27 between the two diaphragm elements 12A and 12B respectively of the double diaphragm 12, this taking place via the hose 30, the chamber 25 and the duct 26. The equili brium, which has previously prevailed in said space 27, and URE^ 0MP1 which has previously been adjusted by means of the thrott¬ ling means 51, is then interrupted. The diaphragm 12 on account of the difference in size of the areas of the ele¬ ments of the diaphragm thereby tends to be pressed in direc¬ tion towards the maximum position. In the drawing this is the direction, in which the piston rod 8 is projected in downwards direction, so that the arm 4 gradually actuates the wire 10 causing the same to increase the gas supply to the pump motor. The pressure in the first chamber 16 is reduced, the diaphragm 54, which is balanced against the spring 47, sinking in downwards direction towards the boss 52C. The arm 39, which constitutes the connection between the diaphragm 54 and the valve body 21 then will actuate the valve body 21, so that it will press down the ball valve body 22 by means of a downwards projecting portion 21A. The quantity of liquid, which is required in order to cause the double diaphragm 12 to be pressed down into the position, that corresponds to the " preadjusted pressure, then via the passage 24 flows into the* chambers 18 and 16 respectively. However, it should be noted that accord ing to the diaphragm 12 being pressed down, the gas supply to the motor is increased, which causes the pressure from the pump to increase. The setting of the spring 47 warrants a certain pressure in the first chamber 16, which in its turn warrants a pressure, that is proportionally greater with respect to the areas of the elements 12A and 12B res¬ pectively of the diaphragm, i.e. the output pressure, which is transported from the pump. .When a state of equilibrium has been obtained the diaphragm 54 is pressed to a middle position in which position the protruding part 21A of the valve body 21 abuts exactly closely against the ball valve body 22. In this position an exceedingly small quantity of liquid flows through the regulator and out via the discharge 20A to the surrounding air. The fact that liquid " flows past the valve body 21 in this position is a necessary feature for the satisfactory function of the diaphragm 34 in the IJUREXC OMPI chamber 2, as will be explained further on. The described sequence has brought about that the pump now pumps a greate quantity of liquid at the same pressure as before. When on the other hand the output of liquid from the pump decreases, the regulation takes place in the following manner, reference in the first place being made to Fig. 5. The output pressure from the pump tends to in¬ crease, which causes the diaphragm 12 to be pressed in up¬ wards direction, so that the arm 4 tends to actuate the gas supply wire 10 to reduce the gas supply. The pressure in the first chamber 16 increases, the diaphragm 54 as well as the valve body 21 then being pressed upwards the latter one reaching its maximum position letting out an increased quantity of liquid through the discharge opening 20A. The diaphragm 12 is displaced in upwards direction to its mini¬ mum " position and this, as has been said previously, brings in its train that the gas supply is reduced. The diaphragm 12 has then occupied a position, which corresponds to the reduced output of liquid from the pump, i.e. an ^-equilibrium has been obtained. Also the valve body 21 has occupied a position of equilibrium, while the ball valve body 22 sub¬ stantially completely blocks the passage 24. In the case described the pump now pumps a smaller quantity of liquid than before at the same pressure. It should be noted that the double diaphragm occupies its maximum, position and minimum position respect¬ ively, when the capacity of the pump just has been reached or exceeded and when little or no liquid at all flows out of the pump respectively. The special situation will now be explained, when the pump cannot deliver the quantity of liquid, which would be required according to the setting of the regulator, by way of example when the input quantity of liquid is limit ed, reference being made to Fig. 6. The function onf the dia phragm 34 is important in this case, as, in case such a dia¬ phragm should not have been arranged, the regulator would have reacted, as if the pressure sensed had not corre¬ sponded to the adjusted pressure. This would have brought in its train that the diaphragm 12 would have occupied its maximum position setting the power source to deliver its maximum effect with cavitation and the risk of an interrup¬ tion of the flow of liquid in the pump as a result. The diaphragm 34 is therefore adjusted to the effect that at an- absolute pressure of approximately 0,3 kg and less it will impede the opening up of the passage 24, so that the pressure in the first chamber 16 is increased and brings about an increase of the ' gas supply. The gas supply is instead now reduced as a consequence of too small a quantit of liquid flowing past the valve body 21. Thanks to the diaphragm 34 an equilibrium is ' now reached with ah input pressure of the pump of approximately 0,3 kg completely independent of the utput pressure of the pump. Thus, this brings in its train that the pump can pump the maximum quantity of liquid permitted by the prevailing conditions. The automatic displacement of thtf gas supply control to its minimum position, when the supply of liquid to the pump is completely interrupted, is an additional function of the regulator. This does not take place by a pressure of liquid between the diaphragm elements 12A and 12B respectively of the double diaphragm 12, as was the cas in the previously described situations, as in this case the atmospheric pressure prevails in the space 27 between them. The spring 7 on the arm 4 will press the diaphragm 12 in upwards direction, when an interruption of the liquid flow takes place, so that the liquid in the chambers 16 and 18 is drained out through the valve arrangement 21, 22 and the back way past the ball valve. The regulator schematically illustrated in Fig. 7 essentially corresponds to the regulator described and illustrated in the previous drawings with the exception that the double diaphragm has been substituted by a valve 2 arrangement 12 comprising a number of elements, more par- OMPI ticularly one diaphragm 12A2 and a piston 12B2. Both these elements are connected with each other in a similar way as the diaphragm in the previously described regulator. 2 A chamber 27 debouching in the atmosphere is formed bet- ween the diaphragm 12A 2 and the piston 12B2. A chamber 162, 2 which borders upon the diaphragm 12A , corresponds to the above said first chamber 16. A further chamber 15 2, which 2 borders upon the piston 12B , and which is sealed from the 2 atmosphere, is via a duct 26 connected with a secondary 2 2 valve arrangement 21 , 22 similar to the one previously described. The active pressure surface of the dia- 2 2 phrag element 12A and the piston element 12B respectivel differ from each other in the same manner as in the de- scribed double diaphragm 12, by way of a suggestion like¬ wise with the relation 4:1. The function of the additionally described regulator is substantially identical to the function of the previously described regulator in spite of the fjact that the space 27 2 and 152 respectively, which is defined by the valve elements 12A 2 and 12B2, and borders upon a valve 2 element 12B respectively, debouches in the atmosphere and is connected with the first chamber 16 2 respectively, i.e. quite contrary to what is the case in the described double diaphragm 12. The invention is not limited to the example of embodiment illustrated in the drawings and described above, but can be varied within the scope of the following claims. It is quite possible to include a regulator in the scope of the invention, which by way of example only exhibits one valve element, a spring possibly being provided which in case of a'possible pressureless situation can move a piston connected with by way of example a gas supply control to its minimum position. - B UREA O PI

Claims: C l a i m s 1. Regulator in a motor driven pump for the regulation of the output pressure according to a predeter¬ mined value, c h a r a c t e r i z e d b y a main valve arrangement (12; 12 ), preferably a double diaphragm (12), via a preferably spring biassed transmission means (4, 10) of movement being connected with a controlling means serv¬ ing the purpose to control the capacity of the power source 2 of the pump, and by a space (27; 15 ) defined by or border- ing upon said main valve arrangement (12; 12 2) being in communication with the output pressure of the pump for the 2 actuation of said main valve arrangement (12; 12 ) in order to adjust the controlling means of the capacity in a desired degree, an increased or decreased fluid output from the pump bringing, about a displacement of the main valve arrangement (12; 12 2) to the maximum position (Fig. 4) or the minimum position (Fig. 5) respectively of the same. 2. Regulator according to claim 1, c h a r a c - 2 t e r i z e d b y the main valve arrangement (12; 12 ) comprising a number of elements, valves (12B) and/or dia- 2 phragms (12A, 12B; 12A ), which are coupled together to 2 form a double diaphragm etc. (12; 12 ) and in between them 2 form at least one chamber (27; 27 ) , at least one element (12B; 12A 2; 12B2) of the main valve arrangement being in communication with the surrounding air, while an element 2 (12A; 12A ) is in pressure communication with a first chamber (16; 16 2) , which can be communicated with the interior space (27) of the double diaphragm (12) or with a chamber (15 2) , which borders upon a second element (12B2) 2 forming part of the mam valve arrangement (12 ) . 3. Regulator according to claim 2, c h a r a c ¬ t e r i z e d b y a secondary valve arrangement (21, 22) being provided in a passage (24) between said chamber (16) "BU EA OMPI and the double diaphragm (12) for the. opening and the shutting respectively of said passage (24) , and by said secondary valve arrangement (21, 22) also being arranged to regulate the degree of communication between said first chamber (16) and the surrounding air. 4. Regulator according to claim 3, c h a r a c t e r i z e d b y a diaphragm (54) located in a middle chamber (18) provided between said first chamber (16) and said secondary valve arrangement (21, 22) being connected with a shaft (52) , which can be actuated by a swinging arm (39) connected with a setting control (51) . 5. Regulator according to claim 4, c h a r a c t e r i z e d b y one end (39B) of the swinging arm (39) being connected with said secondary valve arrangement (21, 22) , its other end (39A) being connected with a bar (36) , which is connected with a diaphragm (34) operating in a second chamber (2) . 6. Regulator according to claim 5', c h r a c t e r i z e d b y said second chamber (2) beinjg arranged to permit its communication with the suction side (31) of the pump. 7. Regulator according to claim 6, c h a r a c ¬ t e r i z e d b y the diaphragm (34) operating in said chamber (2) being arranged in connection with a predeter- • mined change of the pressure to impede the opening up of the communication between the interior space (27) of the double diaphragm (12) and the middle chamber (18) . 8. Regulator according to anyone of the claims 2-7, c h a r a c t e r i z e d b y the active pressure surfaces of the two diaphragm elements (12A, 12B) of the double diaphragm (12) considerably differing with respect to their areas, the relation preferably being 4:1. 9. Regulator according to anyone of the claims 4-8, c h a r a c t e r i z e d b y the swinging arm (39) being connected with a spring element (47) .cooperating with a setting control (51) , one supporting means (47B) of said 1JU EΛ OMPI spring element being adjustable by means of said setting control (51) in order to bring about a desired equili¬ brium of the double diaphragm (12) . 10. Regulator according to anyone of the claims 3-9, c h a r a c t e r i z e d b y said secondary valve arrangement (21, 22) comprising a ball valve body (22) , which is spring biassed against an opening (24) against the closing position of the valve, and a mushroom valve (21) cooperating with an additional valve seat, of which mushroom valve one end (21A) can be caused to abut against said ball valve body (22) . "BUREA OMPI

Inventors: ANDERSSON ULF, ANDERSSON, ULF
Applicants: ANDERSSON ULF, ANDERSSON, ULF
Application year: 1982
Main classification: F04B49
IPC codes: F04B49