CN116608160A - Pump head assembly and liquid delivery pump comprising same - Google Patents

Abstract

The invention discloses a pump head assembly with a liquid filler and a liquid delivery pump comprising the pump head assembly. By providing the first through-hole and the second through-hole in the pump head in fluid communication with the pump chamber and in fluid communication with the liquid filler, the liquid in the pump chamber can be brought into the liquid filler as the next liquid supply when the liquid delivery pump is operating normally. By squeezing the liquid filler housing, the supply liquid can be injected into the pump chamber before the pump is started, the resistance to rotation of the vanes when the pump is started is reduced, and the pump is assisted in starting. The pump head assembly can be used for injecting and supplying liquid into the liquid feeder for many times repeatedly, so that the liquid lubrication operation process of the pump is simple and convenient, and the cost is saved.

Description

Pump head assembly and liquid delivery pump comprising same

Technical Field

The present invention relates to liquid transfer pumps, and more particularly to a pump head assembly for a liquid transfer pump.

Background

A liquid transfer pump is a mechanism for transferring a transfer medium for transferring mechanical energy of a prime mover or other external energy to a transfer liquid, thereby increasing the energy of the transfer liquid. For example, the liquid delivery pump may be configured to deliver liquid by high speed rotation of the impeller. When the pump works, the impeller of the pump rotates at a high speed in the pump cavity, at the moment, the pump forms a pressure cavity due to the rotation of the impeller, liquid is sucked from the inlet of the pump head under the action of centrifugal force in the pressure cavity, and is discharged from the outlet of the pump head, and the momentum of the discharged liquid is greatly increased, so that the liquid is transmitted. The liquid transfer pump may be subdivided into axial flow, radial flow, diagonal flow, combined, etc., depending on the direction of flow through the flow.

Before each start-up of the liquid delivery pump, a proper amount of liquid needs to be injected into the pump cavity for lubrication. The lubricating fluid reduces the resistance to rotation of the vanes during start-up of the fluid delivery pump to assist in pump start-up. However, the conventional liquid delivery pump requires manual injection of the liquid for lubrication into the pump chamber by an operator before each start-up, which is very inconvenient.

Disclosure of Invention

In order to solve the above problems and disadvantages, an object of the present invention is to provide a pump head assembly with a liquid filler and a liquid delivery pump including the same, which can realize that liquid for lubrication is injected into a pump chamber through the liquid filler before each start of the pump, and the liquid for lubrication is only injected into the pump chamber when the liquid filler is used for the first time.

Based on this, according to an embodiment of the present invention, there is provided a pump head assembly for a liquid delivery pump, including: a pump head defining a pump chamber; a pump inlet and a pump outlet, respectively, disposed on the pump head and in fluid communication with the pump chamber; an impeller disposed within the pump chamber and configured to convey liquid from the pump inlet to the pump outlet via the pump chamber as the impeller rotates; a first through-hole and a second through-hole provided on the pump head and in fluid communication with the pump chamber, respectively, the first through-hole and the second through-hole being arranged such that a pressure at the first through-hole is greater than a pressure at the second through-hole when the impeller is rotated; a liquid filler, comprising: a liquid filler housing defining a liquid reservoir for containing a supply liquid; a liquid filler inlet and a liquid filler outlet disposed on the liquid filler housing and in fluid communication with the liquid storage chamber, respectively, the liquid filler inlet in fluid communication with the first through-hole and the liquid filler outlet in fluid communication with the second through-hole; wherein the liquid charger is configured to cause the supply liquid in the liquid storage chamber to be supplied to the pump chamber via the liquid charger outlet before the impeller rotates, and to cause the liquid in the pump chamber to enter the liquid storage chamber via the liquid charger inlet as the next supply liquid when the impeller rotates.

By using the pump head assembly of this embodiment, it is only necessary to inject the supply liquid into the pump head assembly when the pump head is first used, and then supply the supply liquid in the pump head assembly to the pump chamber for lubrication before the liquid delivery pump including the pump head assembly begins to operate. Since the liquid in the pump cavity is automatically injected into the liquid feeder as the next liquid supply during the operation of the liquid feeder, the liquid stored in the liquid feeder during the previous operation is only supplied to the pump cavity before the liquid feeder is started, and the operation is repeated, so that the effect of reducing the rotation resistance of the impeller during the starting of the liquid feeder is realized.

In one embodiment, the first angle between the first through hole and the pump outlet is smaller than the second angle between the second through hole and the pump outlet with the center of the impeller when rotating as a center.

In one embodiment, the liquid charger further comprises: a first unidirectional flow member disposed within the liquid filler housing and configured to allow liquid in the pump chamber to enter the liquid reservoir chamber via the liquid filler inlet as a next supply of liquid when the impeller is rotated, and to prevent the next supply of liquid in the liquid reservoir chamber from exiting the liquid reservoir chamber via the liquid filler inlet when the impeller stops rotating.

In one embodiment, the liquid charger further comprises: a second unidirectional flow member disposed within the liquid filler housing and configured to allow the supply liquid within the liquid reservoir to flow out of the liquid reservoir via the liquid filler outlet prior to rotation of the impeller.

In one embodiment, the first unidirectional flow member is located directly below the filler inlet and the second unidirectional flow member is located directly below the filler outlet.

In one embodiment, the first unidirectional flow member and the second unidirectional flow member are combined into a single member.

In one embodiment, the liquid charger is configured to cause the supply liquid within the liquid storage chamber to be provided to the pump chamber via the liquid charger outlet in response to a force applied to the liquid charger housing prior to rotation of the impeller.

In one embodiment, at least a portion of the liquid filler housing is made of a flexible material.

In one embodiment, the bottom of the liquid filler housing is made of a flexible material.

According to another embodiment of the present invention, there is provided a liquid transfer pump including: the pump head assembly of any of the embodiments described above.

Drawings

Other features and advantages of the present invention will be better understood from the following detailed description of the preferred embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a schematic view of a pump head assembly for a radial flow liquid transfer pump in accordance with one embodiment of the invention.

FIG. 2 is a schematic illustration of a first and second through-hole arrangement on a pump head assembly according to one embodiment of the invention.

Fig. 3 is a schematic view of a liquid charger according to an embodiment of the present invention.

Fig. 4 is a schematic view of a liquid charger according to another embodiment of the present invention.

Detailed Description

The making and using of the embodiments are discussed in detail below. It should be understood, however, that the detailed description and the specific examples, while indicating specific ways of making and using the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The expressions such as left, right, clockwise, high pressure, low pressure, etc. used in describing the various components are not absolute, but relative. When the individual components are arranged as shown in the figures, these expressions are appropriate, but when the positions of the individual components in the figures are changed, these expressions also change accordingly.

A pump head assembly according to one embodiment of the present invention may be adapted for use with any suitable liquid delivery pump. Such as radial flow liquid transfer pumps, etc. The following description will be made taking an example of the application of the exemplary pump head assembly of the present invention to a radial flow liquid delivery pump.

Fig. 1 is a schematic view of a pump head assembly for a radial flow liquid transfer pump in accordance with one embodiment of the invention.

Referring to fig. 1, the pump head assembly 10 includes a pump head 101, pump inlets 102 and 103, an impeller 104, first and second through holes 105 and 106, and a liquid filler 107. The pump head 101 defines a pump chamber 109. In one example, the cover plate 110 may be secured to the pump head 101 by using, for example, screw fasteners 108 to form the pump chamber 109. Pump inlet 102 and pump outlet 103 are provided on pump head 101 and are in fluid communication with pump chamber 109 as the inlet and outlet of the liquid delivery pump for delivering liquid, respectively. An impeller 104 is disposed in the pump chamber 109. When the impeller 104 rotates (e.g., the impeller 104 rotates clockwise at a high speed in this example), a strong centrifugal force is generated in the pump chamber 109, the pressure in the pump chamber 109 forms a low pressure at the pump inlet 102 and a high pressure at the pump outlet 103, so that the delivery liquid is sucked in from the pump inlet 102 located in the low pressure region and discharged from the pump outlet 103 located in the high pressure region to achieve delivery of the liquid. In one example, the rotation of the impeller 104 may be driven by, for example, a shaft 111 and an external motor (not shown). Specifically, the impeller 104 may be fixed on the rotating shaft 111, and the rotating shaft 111 is driven to rotate by an external motor to rotate the impeller 104. The first through-hole 105 and the second through-hole 106 are provided on the pump head 101, respectively, and are in fluid communication with the pump chamber 109 for delivery of a supply liquid (to be described in detail later). The positions of the first through-hole 105 and the second through-hole 106 on the pump head 101 may be arranged such that the pressure at the first through-hole 105 is greater than the pressure at the second through-hole 106 when the impeller 104 rotates.

Still referring to fig. 1, the liquid charger 107 includes a liquid charger housing 1071, a liquid charger inlet 1072, and a liquid charger outlet 1073. The liquid filler housing 1071 defines a liquid reservoir 1074 for containing a supply of liquid with a lubricating effect. A liquid filler inlet 1072 and a liquid filler outlet 1073 are provided on the liquid filler housing 1071 and are in fluid communication with the liquid reservoir 1074, respectively. In addition, the inlet of the liquid charger 1072 is also in fluid communication with the first through hole 105, and the liquid charger outlet 1073 is also in fluid communication with the second through hole 106. In one example, fluid communication between the charging inlet 1072 and the first through hole 105 and fluid communication between the charging outlet 1073 and the second through hole 106 may be achieved by, for example, two hoses connecting the charging inlet 1072 and the first through hole 105 and the charging outlet 1073 and the second through hole 106, respectively.

When the liquid filler 107 is first used, the liquid is injected into the liquid storage chamber 1074. Before the operation of the liquid transfer pump is started (i.e., before the impeller 104 rotates), the supply liquid in the liquid storage chamber 1074 of the liquid filler 107 is supplied into the pump chamber 109 via the liquid filler outlet 1073 and the second through hole 106 to lubricate the operation of the liquid transfer pump. In one example, the liquid may be provided into the pump chamber 109 via the liquid filler outlet 1073 and the second through hole 106 by applying a force to the liquid filler housing 1071, which in turn acts on the liquid filler within the liquid reservoir 1074.

When the liquid transfer pump is in an operational state, it transfers transfer liquid from the pump inlet 102 to the pump outlet 103 via the pump chamber 109 by rotation of the impeller 104. Rotation of the impeller 104 creates a pressure differential between the first through-hole 105 and the second through-hole 106 and the pressure at the first through-hole 105 is greater than the pressure at the second through-hole 106, so that liquid in the pump chamber 109 enters the liquid reservoir chamber 1074 through the first through-hole 105, the liquid filler inlet 1072. With operation of the fluid transfer pump, a supply of fluid will be stored in the fluid reservoir 1074, which may be provided to the pump chamber 109 for lubrication prior to the next operation of the fluid transfer pump. Thus, by repeating this operation, the pump head assembly 10 according to one embodiment of the present invention can achieve that only the first time the liquid filler 107 is used, the liquid filler 107 is filled with the liquid filler, and then the liquid filler is filled into the pump chamber 109 before the liquid filler 107 is started each time the liquid filler is filled with the liquid filler, and the liquid filler is stored in the liquid filler 107.

Referring to fig. 2, in one embodiment of a pump head assembly for a radial flow liquid delivery pump according to the present invention, in order to achieve that the pressure at the first through hole 105 is greater than the pressure at the second through hole 106, in one example, the first through hole 105 and the second through hole 106 are arranged on the pump head 101 with the center of rotation of the impeller 104 as the center of the circle such that a first angle α is formed between the position of the first through hole 105 and the position of the pump 103, a second angle β is formed between the position of the second through hole 106 and the position of the pump 103, and the first angle α is smaller than the second angle β. By this arrangement, the pressure at the first through hole 105 can be made larger than the pressure at the second through hole 106 when the impeller 104 rotates.

Referring to fig. 3, in one example, the liquid charger 107 may be provided with a first unidirectional flow member 1075 located within the liquid charger housing 1071 and near the liquid charger inlet 1072. Alternatively, the first unidirectional flow member 1075 may be located directly below the filler inlet 1072. As the impeller 104 rotates, the first unidirectional flow member 1075 allows liquid in the pump chamber 109 to enter the reservoir chamber 1074 via the filler inlet 1072 as the next supply of liquid; after the impeller stops rotating, the first unidirectional flow member 1075 prevents the next supply of liquid in the reservoir 1074 from exiting the reservoir 1074 through the filler inlet 1072. The first unidirectional flow member 1075 may include, for example, a reverse-draft prevention flap 10751. In the no water pressure state, the reverse suction flap 10751 remains closed. When liquid flows into the liquid storage cavity 1074 from the pump cavity 109, the anti-backflow flap 10751 is opened under the action of water pressure, allowing the circulation of the liquid; when liquid is to flow from the reservoir 1074 into the pump chamber 109, the anti-suck-back flap 10751 remains closed preventing the flow of liquid. By using the first unidirectional flow member 1075, after the impeller 104 stops rotating, the supply liquid in the liquid storage chamber 1074 can be effectively prevented from flowing back into the pump chamber 109 through the liquid filler inlet 1072 and the first through hole 105.

Still referring to fig. 3, in one example, the liquid charger 107 may further include a second unidirectional flow member 1076 disposed within the liquid charger housing 1071 and may be positioned adjacent to the liquid charger outlet 1073. Alternatively, the second unidirectional flow member 1076 may be located directly below the filler outlet 1073. The second unidirectional flow member 1076 may include, for example, a reverse-draft prevention flap 10761. The second unidirectional flow member 1076 allows the feed liquid in the reservoir 1074 to flow out of the reservoir 1074 through the filler outlet 1073 and prevents backflow of the feed liquid into the reservoir 1074 before the liquid transfer pump begins to operate (i.e., before the impeller 104 rotates). This makes it more convenient and efficient to inject the feed liquid in the liquid reservoir 1074 into the pump chamber 109 before the impeller 104 rotates.

In fig. 3, a first unidirectional flow member 1075 and a second unidirectional flow member 1076 are provided in the liquid charger 107, respectively. However, it will be appreciated that in other examples, the two unidirectional flow members may be joined together as one member. Referring to fig. 4, a unidirectional flow member 2075, which is combined into one member, is provided in the syringe housing 2071 for controlling the flow of liquid. The unidirectional flow member 2075 may allow liquid to flow from the liquid filler inlet 2072 into the reservoir 2074, out of the reservoir 2074 from the liquid filler outlet 2073, and prevent liquid from flowing from the liquid filler inlet 2072 out of the reservoir 2074 and from the liquid filler outlet 2073 into the reservoir 2074. The unidirectional flow member 2075 may, for example, comprise a baffle 20751 and a reverse-draft prevention flap 20752. The baffle 20751 and the anti-suck-back flap 20752 may be made of, for example, an elastic material. The anti-suck-back flap 20752 may be secured in a slot adjacent the liquid filler outlet 2073 in fluid communication therewith. The baffle 20751 may have a contact with the liquid feeder housing 2071 near the liquid feeder inlet 2072, such as contact a in fig. 4, to shield the liquid feeder inlet 2072. The anti-suck-back flap 20752 allows the feed liquid in the reservoir 2074 to flow out of the reservoir 2074 through the filler outlet 2073 and prevents the feed liquid from flowing back into the reservoir 2074 before the impeller 105 rotates, thereby achieving a function similar to the second unidirectional flow member 1076 of fig. 3 in the vicinity of the filler outlet 2073. When the impeller 104 rotates, due to the pressure difference between the first through hole 105 and the second through hole 106, the liquid in the pump chamber 109 is about to enter the liquid storage chamber 2074 through the liquid filler inlet 2072, and at this time, the baffle 20751 is sprung open at the contact point a under the action of the water pressure, thereby allowing the liquid to enter the liquid storage chamber 2074 as the next liquid supply. When the impeller 104 stops rotating, the baffle 20751 comes again into contact with the syringe housing 2071 at contact a, thereby preventing the flow of feed liquid from the syringe inlet 2072. The baffle 20751 performs a function similar to the first unidirectional flow member 1075 of fig. 3 near the filler inlet 2072. Providing the unidirectional flow members 2075 combined into one member may simplify the structure as compared to providing the first unidirectional flow member 1075 and the second unidirectional flow member 1076, respectively.

In one example, as shown in fig. 3, at least a portion of the liquid filler housing 1071 may be made of a flexible material. Injection of the supply liquid into the pump chamber 109 is achieved by exerting a force on the flexible material such that the volume of the liquid reservoir 1074 becomes smaller. Optionally, the bottom of the liquid filler housing 1071 is made of a flexible material to facilitate the application of pressure. In other examples, the liquid filling device 107 may also adopt a cavity structure (not shown) provided with a push rod, the interior of the liquid storage cavity 1074 penetrates through the push rod, and a rubber plug is fixedly connected to the bottom of the push rod. When the liquid storage device is used, the push rod is extruded by external force, so that the rubber plug extrudes the supplied liquid, the volume of the liquid storage cavity 1074 can be reduced, and the supplied liquid in the liquid storage cavity 1074 flows out.

Although the present invention has been described herein with reference to particular examples, which are intended to be illustrative only and not to be limiting of the invention, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the invention.

Claims (10)

1. A pump head assembly for a liquid delivery pump, comprising:

a pump head defining a pump chamber;

a pump inlet and a pump outlet, respectively, disposed on the pump head and in fluid communication with the pump chamber;

an impeller disposed within the pump chamber and configured to convey liquid from the pump inlet to the pump outlet via the pump chamber as the impeller rotates;

a first through-hole and a second through-hole provided on the pump head and in fluid communication with the pump chamber, respectively, the first through-hole and the second through-hole being arranged such that a pressure at the first through-hole is greater than a pressure at the second through-hole when the impeller is rotated;

a liquid filler, comprising:

a liquid filler housing defining a liquid reservoir for containing a supply liquid;

a liquid filler inlet and a liquid filler outlet disposed on the liquid filler housing and in fluid communication with the liquid storage chamber, respectively, the liquid filler inlet in fluid communication with the first through-hole and the liquid filler outlet in fluid communication with the second through-hole;

wherein the liquid charger is configured to cause the supply liquid in the liquid storage chamber to be supplied to the pump chamber via the liquid charger outlet before the impeller rotates, and to cause the liquid in the pump chamber to enter the liquid storage chamber via the liquid charger inlet as the next supply liquid when the impeller rotates.

2. The pump head assembly of claim 1 wherein a first angle between the first through hole and the pump outlet is less than a second angle between the second through hole and the pump outlet about a center of rotation of the impeller.

3. The pump head assembly of claim 1 wherein the liquid charger further comprises:

a first unidirectional flow member disposed within the liquid filler housing and configured to allow liquid in the pump chamber to enter the liquid reservoir chamber via the liquid filler inlet as a next supply of liquid when the impeller is rotated, and to prevent the next supply of liquid in the liquid reservoir chamber from exiting the liquid reservoir chamber via the liquid filler inlet when the impeller stops rotating.

4. A pump head assembly according to claim 3, wherein the liquid charger further comprises:

a second unidirectional flow member disposed within the liquid filler housing and configured to allow the supply liquid within the liquid reservoir to flow out of the liquid reservoir via the liquid filler outlet prior to rotation of the impeller.

5. The pump head assembly of claim 4 wherein said first unidirectional flow member is located directly below said filler inlet and said second unidirectional flow member is located directly below said filler outlet.

6. The pump head assembly of claim 4 wherein said first unidirectional flow member and said second unidirectional flow member are combined into a single member.

7. The pump head assembly of claim 1 wherein the liquid charger is configured to cause the supply liquid within the liquid storage chamber to be provided to the pump chamber via the liquid charger outlet in response to a force applied to the liquid charger housing prior to rotation of the impeller.

8. The pump head assembly of claim 7 wherein at least a portion of the liquid filler housing is made of a flexible material.

9. The pump head assembly of claim 8 wherein the bottom of the filler housing is made of a flexible material.

10. A liquid transfer pump comprising:

a pump head assembly as claimed in any one of claims 1 to 9.