CN216009002U - Pressure sealed centrifugal water pump - Google Patents
Pressure sealed centrifugal water pump Download PDFInfo
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- CN216009002U CN216009002U CN202122465955.2U CN202122465955U CN216009002U CN 216009002 U CN216009002 U CN 216009002U CN 202122465955 U CN202122465955 U CN 202122465955U CN 216009002 U CN216009002 U CN 216009002U
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Abstract
The utility model provides a pressure seal formula centrifugal water pump, includes bearing frame, impeller, pump shaft, pump case and pressure seal assembly, and the bearing frame bears the pump shaft, and the impeller is installed on the pump shaft, and the pump shaft is worn out from the both ends of pump case, and the impeller is located the pump case, and the pressure seal assembly cover is established on the pump shaft and pressure seal assembly and pump shaft can relative rotation, and pressure seal assembly takes place deformation according to the effect state of external pressure medium, and pressure seal assembly utilizes the deformation of self and the dynamic seal of pump case cooperation completion pressure seal formula centrifugal water pump, dynamic seal indicates: before the pressure-sealed centrifugal water pump is started, the deformation part of the pressure sealing assembly deforms under the pressure applying state of an external pressure medium, so that the deformation part of the pressure sealing assembly is in contact with the pump shaft to realize sealing; after the pressure sealing type centrifugal water pump is started and the pressure state of the external pressure medium is cancelled, the deformation of the deformation part of the pressure sealing assembly is recovered to remove the contact sealing with the pump shaft.
Description
Technical Field
The utility model relates to a pressure seal formula centrifugal water pump.
Background
The sealing failure of the shaft sealing device in the operation of domestic and domestic centrifugal water pumps is the main reason influencing the safe and economic operation of the water pumps, the maintenance cost of the centrifugal pumps is 70 percent for processing the sealing failure, the sealing performance of the shaft sealing device of the water pumps is an important index for evaluating the quality of the pumps, the mechanical efficiency and the volumetric efficiency of the water pumps are directly influenced, and the leakage generated by the sealing gaps between the pump shaft and the pump shell at the suction side and the discharge side is the root cause of the accident. The common shaft seal modes of the centrifugal pump comprise a packing seal and a mechanical seal, and the mechanical seal has poor adaptability to media, higher cost and maintenance cost and less use. The most common is packing seal, in the existing multistage centrifugal pump adopting packing seal, a suction section and a left packing gland are matched to form a space for accommodating sealing packing, a stuffing box body and a right packing gland are arranged at the tail end of a water outlet section, and the stuffing box body and the right packing gland are matched to form a space for accommodating sealing packing, so that the sealing of the multistage centrifugal pump is realized. Due to the defects of the packing seal and the problem of poor adaptability to the water pump, the failure rate is high in use, and the safe and economic operation of the water pump is finally directly influenced.
The packing seal causes the following technical problems due to continuous friction: the method comprises the following steps of 1, affecting the efficiency of a water pump, wherein the roughness is increased along with the abrasion of a shaft sleeve of a first pump and a second pump of the water pump, the mechanical efficiency of the water pump is reduced along with the increase of the friction force, the mechanical efficiency of a new pump is affected by a packing seal at the initial stage by 2%, and the abrasion of the shaft sleeve reaches more than 5% in the later stage (introduced in the text of 'good and poor packing seal of a centrifugal pump', the packing seal needs 10% -15% of shaft power to overcome the friction force between the shaft sleeve and the packing to achieve sealing). The friction heating often causes the accidents of filler smoking, which causes potential safety hazards to the underground coal mine and chemical field. 2. Because the filler and the shaft sleeve rub to form a gap, the compensation of the filler is poor, the leakage is increased, the vacuum degree of a water suction port of the water pump is reduced, the light water pump generates cavitation erosion, an impeller and a guide wing of the water pump are quickly damaged, and the heavy water pump does not feed water, a rotor and a pump shell rub together in a dry way, so that the locking accident of a water pump shaft occurs; 3. the maintenance cost is big, often changes the filler, the axle sleeve.
Disclosure of Invention
In view of the above, it is desirable to provide a pressure-sealed centrifugal water pump that reduces seal friction.
The utility model provides a pressure seal formula centrifugal water pump, includes bearing frame, impeller, pump shaft, pump case and pressure seal assembly, and the bearing frame bears the pump shaft, and the impeller is installed on the pump shaft, and the pump shaft is worn out from the both ends of pump case, and the impeller is located the pump case, and the pressure seal assembly cover is established on the pump shaft and pressure seal assembly and pump shaft can relative rotation, and pressure seal assembly takes place deformation according to the effect state of external pressure medium, and pressure seal assembly utilizes the deformation of self and pump shaft, the pump case cooperation to accomplish pressure seal formula centrifugal water pump's dynamic seal, dynamic seal indicates: before the pressure-sealed centrifugal water pump is started, the deformation part of the pressure sealing assembly deforms under the pressure applying state of an external pressure medium, so that the deformation part of the pressure sealing assembly is in pressure contact with the pump shaft to realize sealing; after the pressure sealing type centrifugal water pump is started and the pressing state of the external pressure medium is cancelled, the deformation of the deformation part of the pressure sealing assembly is recovered to remove the pressed contact sealing with the pump shaft.
Preferably, the pressure sealing assembly is provided with an annular deformation piece and an annular accommodating space which is used for receiving the external pressure medium and is matched with the annular deformation piece, the annular deformation piece is the deformation part, the diameter of the annular deformation piece is smaller than that of the annular deformation piece accommodating space, the annular deformation piece is fixed in the annular accommodating space, and the outer edge of the annular deformation piece is not in contact with the side wall of the enclosed annular accommodating space so as to form a gap for the external pressure medium to enter; the annular deformation piece fixed in the annular accommodating space is sleeved on the pump shaft, a gap is reserved between the annular deformation piece and the pump shaft, and the annular deformation piece deforms under the action of an external pressure medium and is close to the axis of the pump shaft and is in contact with the surface of the pump shaft, so that the sealing of the pressure-sealed centrifugal water pump is realized.
Preferably, the pressure sealing assembly comprises a base, a gland and an annular deformation piece, wherein the base is sleeved on the pump shaft and comprises a first shaft sleeve and a second shaft sleeve, the first end of the first shaft sleeve is fixedly connected with the first section of the second shaft sleeve, the inner diameter of the first shaft sleeve is matched with the outer diameter of the pump shaft, the inner diameter of the first shaft sleeve is smaller than that of the second shaft sleeve, the diameter of the annular deformation piece is smaller than that of the second shaft sleeve and larger than that of the pump shaft, the second end of the second shaft sleeve is relatively fixed with the gland, a space formed among the second shaft sleeve, the gland and the pump shaft is an annular accommodating space, the gland and the first shaft sleeve tightly press and fix the annular deformation piece located in the annular accommodating space, and an annular gap between the second shaft sleeve and the annular deformation piece is used for an external pressure medium to enter; the second end of the first shaft sleeve is fixedly connected with the pump shell.
Preferably, the annular deformation member is a seal ring having a polyurethane composition.
Preferably, the cross section of the annular deformation member is large and small outside the cross section so as to bear the pressure of the external pressure medium by using a large-area part.
Preferably, the gland is provided with an oil filling hole, and an oil filling nozzle is arranged in the oil filling hole.
Preferably, the pressure-sealed centrifugal water pump comprises two pressure sealing assemblies, wherein the two pressure sealing assemblies are sleeved at two ends of the pump shaft and are correspondingly and fixedly connected with two ends of the shell.
Preferably, the pump housing has a communication pipe for delivering the received pressure water with the pressure P in the balance chamber of the pressure-sealed centrifugal water pump to a fitting gap between the first shaft sleeve and the pump shaft to achieve sealing and increase air leakage resistance.
Preferably, the pump shell comprises a suction section, a middle section, a water outlet section, a filler box body and a communicating pipe, wherein the suction section, the middle section, the water outlet section and the filler box body are sequentially connected, and one of the pressure sealing components is matched and connected with the filler box body of the suction section to form a suction side pressure water inlet chamber; the other pressure sealing component is matched and connected with the filler box body connected with the water outlet section and forms a pressure water inlet chamber at a drainage side; the first end of the communicating pipe is communicated with the water-absorbing side pressure water inlet chamber, the second end of the communicating pipe is communicated with the water-discharging side pressure water inlet chamber, water in the balance chamber of the pressure-sealed centrifugal water pump enters the water-discharging side pressure water inlet chamber through a gap between the corresponding box body and the pump shaft, then flows into the water-absorbing side pressure water inlet chamber through the communicating pipe, and then enters the water-absorbing pump water inlet through a gap between the corresponding box body and the pump shaft, so that sealing and air leakage resistance increase are realized.
Preferably, a check valve is disposed in the balance water pipe of the pressure-sealed centrifugal water pump to increase the pressure of the pressure water in the balance chamber by the check valve.
Preferably, the pressure-sealed centrifugal water pump further comprises a pressure medium conveying pipe, the pressure medium conveying pipe is provided with two output pipe heads and an input pipe head, the two output pipe heads are correspondingly connected with the two second shaft sleeves and are respectively communicated with the annular gaps between the corresponding second shaft sleeves and the annular deformation part; the input pipe head of the pressure medium conveying pipe is used for receiving pressure medium; the pressure sealing type centrifugal water pump also comprises a sealing control device, the sealing control device is connected with the pressure medium conveying pipe and the vacuumizing pipe of the pressure sealing type centrifugal water pump, and the sealing control device is used for conveying pressure media to the pressure medium conveying pipe so that the annular deformation piece of the pressure sealing assembly deforms under the pressure applying state of the pressure media, and the annular deformation piece is in contact with the pump shaft to realize sealing; the sealing control device is also used for discharging air in the pump shell by using the vacuum-pumping pipe to form negative pressure in the pump shell so as to enable water to enter the pump shell along the water suction pipe under the pressure of external atmospheric pressure; the sealing control device is also used for stopping pressure medium conveying and vacuum pumping after a preset time period after detecting that the pressure sealing type centrifugal water pump is started.
In the pressure sealing type centrifugal water pump, the pressure sealing component is sleeved on the pump shaft and can rotate relative to the pump shaft, the pressure sealing component deforms according to the action state of an external pressure medium, the pressure sealing component is matched with the pump shaft and the pump shell by utilizing the deformation of the pressure sealing component to complete the dynamic sealing of the pressure sealing type centrifugal water pump, before the pressure sealing type centrifugal water pump is started, the deformation part of the pressure sealing assembly deforms under the pressure applying state of an external pressure medium, so that the deformation part of the pressure sealing assembly is in pressure contact with the pump shaft to realize sealing, after the pressure sealing type centrifugal water pump is started and the pressure state of the external pressure medium is cancelled, the deformation of the deformation part of the pressure sealing component is recovered, the pressure contact sealing with the pump shaft is removed, therefore, the duration time of the contact friction can be reduced, and the continuous and reliable operation of the pressure-sealed centrifugal water pump is ensured.
Drawings
Fig. 1 is a schematic structural view of a pressure-sealed centrifugal water pump according to a preferred embodiment of the present application.
FIG. 2 is a schematic view of the pressure seal assembly and the pump shaft of FIG. 1.
In the figure: the device comprises a pressure sealed centrifugal water pump 10, a balance chamber 11, a pressure medium conveying pipe 12, an evacuation pipe 13, a bearing seat 20, an impeller 30, a pump shaft 40, a wear-resistant layer 41, a pump shell 50, a communication pipe 51, a suction section 52, a suction side pressure water inlet chamber 522, a middle section 53, a water outlet section 54, a stuffing box body 55, a drainage side pressure water inlet chamber 551, a pressure seal assembly 60, an annular deformation piece 61, an annular accommodating space 62, a base 63, a first shaft sleeve 631, a second shaft sleeve 632, a gland 64, a spacing ring 65, an oil filling nozzle 66, a balance water pipe 70, a one-way valve 71, a seal control device 80, a control unit 81, a vacuum jet pump 82, a pressure water pipeline 83 and a controlled electric valve 84.
Detailed Description
Referring to fig. 1 and 2, a pressure-sealed centrifugal water pump 10 includes a bearing seat 20, an impeller 30, a pump shaft 40, a pump housing 50, and a pressure seal assembly 60, wherein the bearing seat 20 bears the pump shaft 40, the impeller 30 is mounted on the pump shaft 40, the pump shaft 40 penetrates through two ends of the pump housing 50, the impeller 30 is located in the pump housing 50, the pressure seal assembly 60 is sleeved on the pump shaft 40, the pressure seal assembly 60 and the pump shaft 40 can rotate relatively, the pressure seal assembly 60 deforms according to an action state of an external pressure medium, and the pressure seal assembly 60 cooperates with the pump shaft 40 and the pump housing 50 by using its own deformation to complete a dynamic seal of the pressure-sealed centrifugal water pump, and the dynamic seal refers to: before the pressure-sealed centrifugal water pump 10 is started, the deformation part of the pressure sealing assembly 60 deforms under the pressure applying state of an external pressure medium, so that the deformation part of the pressure sealing assembly 60 is in pressure contact with the pump shaft 40 to realize sealing; after the pressure-sealed centrifugal water pump is started and the state of pressure applied by the external pressure medium is removed, the deformation of the deformed portion of the pressure seal assembly 60 is restored to release the pressure contact seal with the pump shaft 40. The pressure medium may be a flowing substance, such as water, gas.
Further, the pressure seal assembly 60 is provided with an annular deformation member 61 and an annular accommodating space 62 which is used for receiving an external pressure medium and is matched with the annular deformation member, the annular deformation member 61 is the deformation part, the diameter of the annular deformation member 61 is smaller than that of the annular deformation member accommodating space 62, the annular deformation member 61 is fixed in the annular accommodating space 62, and the outer edge of the annular deformation member 61 is not in contact with the side wall of the surrounding annular accommodating space 62 to form a gap for the external pressure medium to enter; the annular deformation piece 61 fixed in the annular accommodating space 62 is sleeved on the pump shaft 40, a gap b is formed between the annular deformation piece 61 and the pump shaft 40, the value range of the gap b is larger than 0 and smaller than 0.05mm, and the annular deformation piece 61 deforms towards the axis of the pump shaft 40 under the action of an external pressure medium and contacts with the surface of the pump shaft, so that the pressure sealing type centrifugal water pump 10 is sealed. The pressure seal assembly 60 comprises an annular deformation part 61, a base 63 and a gland 64, wherein the annular deformation part 61 is sleeved on the pump shaft, the base 63 comprises a first shaft sleeve 631 and a second shaft sleeve 632, a first end of the first shaft sleeve 631 is fixedly connected with a first section of the second shaft sleeve 632, the inner diameter of the first shaft sleeve 631 is matched with the outer diameter of the pump shaft 40, the inner diameter of the first shaft sleeve 631 is smaller than the inner diameter of the second shaft sleeve 632, the diameter of the annular deformation part 61 is smaller than the inner diameter of the second shaft sleeve 632 and larger than the outer diameter of the pump shaft 40, a second end of the second shaft sleeve 632 is relatively fixed with the gland 64, a space formed among the second shaft sleeve 632, the gland 64 and the pump shaft 40 is an annular accommodating space 62, the gland 64 and the first shaft sleeve 631 tightly press and fix the annular deformation part 61 located in the annular accommodating space 64, and an annular gap between the second shaft sleeve 632 and the annular deformation part 61 is used for an external pressure medium to enter; the second end of the first sleeve 631 is fixedly coupled to the pump housing 50. The clearance b is adjusted by tightening the screw of the gland 64.
In this embodiment, the pressure seal assembly 60 includes two annular deformation members 61 and further includes a spacer ring 65, the two annular deformation members 61 and the spacer ring 65 are disposed in the annular receiving space 62, and the spacer ring 65 is located between the two annular deformation members 61. The annular deformation part 61 is a sealing ring with polyurethane components, and the cross section of the annular deformation part 61 is large in outside and small in inside, so that the large-area part is utilized to bear the pressure of an external pressure medium, and the deformation accuracy and effectiveness of the annular deformation part are further improved. The gland 64 is bored with an oil filler hole, and an oil filler nozzle 66 is installed in the oil filler hole. Further, the surface of the pump shaft 40 is provided with the wear-resistant layer 41 with polyurethane components, and as the wear-resistant layer 41 and the annular deformation part 61 are made of the same material, the resistance of the wear-resistant layer 41 and the annular deformation part 61 during relative movement can be reduced, and the friction is reduced. An annular groove is formed in the position, corresponding to the second shaft sleeve 632, of the pump shaft 40, the wear-resistant layer 41 is arranged in the annular groove, and the thickness of the wear-resistant layer 41 is matched with the depth of the annular groove.
In this embodiment, the pressure-sealed centrifugal water pump 10 includes two pressure sealing assemblies 60, and the two pressure sealing assemblies 60 are sleeved on two ends of the pump shaft 40 and are correspondingly and fixedly connected to two ends of the housing 50. The pump case 50 has a communication pipe 51 for sending the pressure water of pressure P received in the balance chamber 11 of the pressure-sealed centrifugal water pump 10 to the fitting gap b between the first sleeve 631 on the suction side and the pump shaft 402The pressure water of pressure P in the balance chamber 11 enters the fitting gap b between the first sleeve 631 and the pump shaft 40 on the drain side1To effect sealing and increase air leakage resistance. Further, the pressure-sealed centrifugal water pump 10 further includes a pressure medium delivery pipe 12, the pressure medium delivery pipe 12 has two output pipe heads and one input pipe head, the two output pipe heads are correspondingly connected with the two second shaft sleeves 632 and respectively communicated with the annular gaps between the corresponding second shaft sleeves 632 and the annular deformation member 61; input of the pressure medium supply line 12The pipe head is used for receiving pressure medium.
Further, the pump shell 50 includes a communicating pipe 51, a suction section 52, a middle section 53, a water outlet section 54, and a packing box body 55, the suction section 52, the middle section 53, the water outlet section 54, and the packing box body 55 are sequentially connected, one of the pressure sealing assemblies 60 is connected with the packing box body 521 of the suction section 52 in a matching manner, and forms a suction side pressure water inlet chamber 522; another pressure seal assembly 60 is fitted into the stuffing box 55 attached to the outlet section 54 and forms a discharge side pressure water inlet chamber 551; a first end of the communication pipe 51 communicates with the water suction side pressure water inlet chamber 522, a second end of the communication pipe 51 communicates with the water discharge side pressure water inlet chamber 551, and water in the balance chamber 11 of the pressure-sealed centrifugal water pump 10 passes through a fitting gap b between the corresponding case and the pump shaft1The pressure water enters the chamber 551 at the water discharge side, then flows into the pressure water entering chamber 522 at the water suction side through the connection pipe 51, and then passes through the fitting gap b between the corresponding box body and the pump shaft2Enters the water suction port of the water pump so as to realize sealing and increase air leakage resistance.
The principle of the solution of the present application is further explained below, based on the leakage q = pi dh of the concentric annular gap3Δ p/12 μ L, the amount of leakage is proportional to the pressure difference Δ p across the gap. Therefore, the structure can be utilized to achieve the purpose of reducing the pressure difference, and the specific principle is as follows: after the water pump is operated, the pressure P of the pressure water in the balance chamber is larger than the pressure P of the water suction port of the water pump3The water in the balance chamber passes through the gap b1A drain side pressure water inlet chamber 551, a communication pipe 51 leading to a suction side pressure water inlet chamber 522 and then passing through a gap b2Enters the water suction port of the water pump, and the pressure of pressure water entering the water suction side pressure water chamber 522 is P2Since the suction-side pressure water inlet chamber 522 and the discharge-side pressure water inlet chamber 551 communicate with each other through the communication pipe 51, P is a value excluding the piping resistance1≈P2Due to increased pressure of P, P1 、P2Following the increase of height P0 - P1 、P0 - P2Decrease in pressure difference of P0The air leakage of the water pump through the sealing ring is reduced during the operation of the water pump due to the atmospheric pressure of the installation place of the water pump, and the problem of sealing the water pump shaft and the pump shell is solved.Further, a check valve 71 is provided in the balance water pipe 70 of the pressure-sealed centrifugal water pump 10 to increase the pressure of the pressure water in the balance chamber 11 by the check valve 71.
Two states of operation of the pressure seal assembly 60: the first state is a gapless receiving state that water needs to be injected into the pump shell in vacuum before the water pump is started and the annular deformation piece 61 and the pump shaft 40 are in pressed contact, and the second state is a gapless state that the annular deformation piece 61 and the pump shaft 40 are restored to be deformed without pressure when the water pump is started and normally runs. Before the water pump is ready to be started, the pressure water remote control electric valve in the sealing control device is opened, and the pressure water simultaneously supplies water to the vacuum pump and the pressure sealing assembly 60 in the sealing control device. The vacuum jet pump discharges air in the pump case 40, pressure water is injected into an annular gap H cavity between the second shaft sleeve 632 and the annular deformation parts 61 through the communicating pipe 51, the two groups of annular deformation parts 61 are pressed towards the axis of the water pump by the outer ring in the pressing direction, the annular deformation parts 61 are special-shaped sealing rings, the annular deformation parts 61 deform to change the original state without gap with the natural pressure of the pump shaft (the natural pressure without gap corresponds to '0.00 mm < gap b < 0.05 mm') into a state with pressure formed along the circumferential surface of the lip of the sealing ring towards the shaft to achieve the sealing effect, the inside of the pump case is isolated from the outside and forms 'vacuum' under the action of the vacuum jet pump, water enters the pump case along the water suction pipe under the external atmospheric pressure, the pump case is filled with water, and the vacuum valve is closed at the moment to create conditions for starting the water pump. At the moment, the water pump is started, the pump shaft 40 and the annular deformation piece 61 are started in a compressed gapless state, after the water pump is started, the vacuum jet pump pressure water switch is controlled to be powered off and water is stopped after short time delay, no pressure water exists in the cavity H, the annular deformation piece 61 restores the original state and is in a natural gapless state in contact with the pump shaft 40, and the water pump enters a normal operation state.
Further, the pressure-sealed centrifugal water pump 10 further comprises a sealing control device 80, the sealing control device 80 is connected with the pressure medium conveying pipe 12 and the vacuum pumping pipe 13 of the pressure-sealed centrifugal water pump 10, and the sealing control device 80 is used for conveying a pressure medium to the pressure medium conveying pipe 12 so as to deform the annular deformation part 61 of the pressure sealing assembly 60 in a pressure applying state of the pressure medium, so that the annular deformation part 61 is in contact with the pump shaft 40 to realize sealing; the sealing control device 80 is also used for discharging air in the pump shell 50 by using the vacuumizing pipe 13 to form negative pressure in the pump shell 50, so that water enters the pump shell 50 along the suction pipe under the pressure of external atmospheric pressure; the seal control means 80 is also adapted to stop the pressure medium delivery and the evacuation after a predetermined period of time after detecting the start-up of the pressure-sealed centrifugal water pump 10.
Further, the sealing control device 80 includes a control unit 81, a vacuum jet pump 82, a pressure water pipe 83, and a controlled electric valve 84 disposed between the pressure water pipe 83 and the vacuum jet pump 82, and the pressure medium delivery pipe 12, where the control unit 81 is electrically connected to the controlled electric valve 84 and the vacuum jet pump 82, the control unit 81 controls the vacuum jet pump 82 and the controlled electric valve 84 to operate according to the operating state of the pressure-sealed centrifugal water pump 10, for example, the vacuum jet pump 82 and the controlled electric valve 84 may be controlled to operate in a wireless or wired manner, the vacuum jet pump 82 is connected to the vacuum pipe 13 of the pressure-sealed centrifugal water pump 10 through a pipe to achieve vacuum pumping of the pump case, and the pressure water pipe 83 delivers the pressure medium to the pressure medium delivery pipe 12 to achieve deformation sealing of the annular deformation member 61.
In the pressure-sealed centrifugal water pump 10, the pressure seal assembly 60 is sleeved on the pump shaft, the pressure seal assembly 60 and the pump shaft 40 can rotate relatively, the pressure seal assembly 60 deforms according to the action state of an external pressure medium, the pressure seal assembly 60 cooperates with the pump shell by utilizing the deformation of the pressure seal assembly 60 to complete the dynamic sealing of the pressure-sealed centrifugal water pump, before the pressure-sealed centrifugal water pump 10 is started, the deformation part of the pressure seal assembly 60 deforms under the pressure state of the external pressure medium, so that the deformation part of the pressure seal assembly is in pressure contact with the pump shaft 40 to realize the sealing, after the pressure-sealed centrifugal water pump 10 is started and the pressure state of the external pressure medium is cancelled, the deformation part of the pressure seal assembly 60 recovers, the pressure contact sealing with the pump shaft 40 is removed, and the duration time of contact friction can be reduced, ensuring continuous and reliable operation of the pressure-sealed centrifugal water pump 10.
Claims (10)
1. The utility model provides a pressure seal formula centrifugal water pump, includes bearing frame, impeller, pump shaft, pump case, its characterized in that: the pressure seal type centrifugal water pump further comprises a pressure seal assembly, the bearing seat bears the pump shaft, the impeller is installed on the pump shaft, the pump shaft penetrates out of two ends of the pump shell, the impeller is located in the pump shell, the pressure seal assembly is sleeved on the pump shaft, the pressure seal assembly and the pump shaft can rotate relatively, the pressure seal assembly deforms according to the action state of an external pressure medium, the pressure seal assembly completes dynamic sealing of the pressure seal type centrifugal water pump by utilizing self deformation and matching of the pump shaft and the pump shell, and the dynamic sealing means: before the pressure-sealed centrifugal water pump is started, the deformation part of the pressure sealing assembly deforms under the pressure applying state of an external pressure medium, so that the deformation part of the pressure sealing assembly is in pressure contact with the pump shaft to realize sealing; after the pressure sealing type centrifugal water pump is started and the pressing state of the external pressure medium is cancelled, the deformation of the deformation part of the pressure sealing assembly is recovered to remove the pressed contact sealing with the pump shaft.
2. The pressure-sealed centrifugal water pump of claim 1, wherein: the pressure sealing assembly is provided with an annular deformation piece and an annular accommodating space which is used for receiving an external pressure medium and is matched with the annular deformation piece, the annular deformation piece is a deformation part, the diameter of the annular deformation piece is smaller than that of the annular deformation piece accommodating space, the annular deformation piece is fixed in the annular accommodating space, and the outer edge of the annular deformation piece is not in contact with the side wall of the enclosed annular accommodating space so as to form a gap for the external pressure medium to enter; the annular deformation piece fixed in the annular accommodating space is sleeved on the pump shaft, a gap is reserved between the annular deformation piece and the pump shaft, and the annular deformation piece deforms under the action of an external pressure medium and is close to the axis of the pump shaft and is in contact with the surface of the pump shaft, so that the sealing of the pressure-sealed centrifugal water pump is realized.
3. The pressure-sealed centrifugal water pump of claim 2, wherein: the pressure sealing assembly comprises a base, a gland and an annular deformation piece, the base is sleeved on the pump shaft and comprises a first shaft sleeve and a second shaft sleeve, the first end of the first shaft sleeve is fixedly connected with the first section of the second shaft sleeve, the inner diameter of the first shaft sleeve is matched with the outer diameter of the pump shaft, the inner diameter of the first shaft sleeve is smaller than that of the second shaft sleeve, the diameter of the annular deformation piece is smaller than that of the second shaft sleeve and larger than that of the pump shaft, the second end of the second shaft sleeve is relatively fixed with the gland, a space formed among the second shaft sleeve, the gland and the pump shaft is an annular accommodating space, the gland and the first shaft sleeve compress and fix the annular deformation piece in the annular accommodating space, and an annular gap between the second shaft sleeve and the annular deformation piece is used for an external pressure medium to enter; the second end of the first shaft sleeve is fixedly connected with the pump shell.
4. A pressure-sealed centrifugal water pump according to claim 3, characterized in that: the annular deformation piece is a sealing ring with polyurethane components.
5. The pressure-sealed centrifugal water pump of claim 4, wherein: the cross section of the annular deformation piece is large and small outside and inside so as to utilize the large-area part to bear the pressure of the external pressure medium.
6. The pressure-sealed centrifugal water pump according to any one of claims 3 to 5, characterized in that: the pressure sealing type centrifugal water pump comprises two pressure sealing assemblies, wherein the two pressure sealing assemblies are sleeved at two ends of a pump shaft and are correspondingly and fixedly connected with two ends of a shell.
7. The pressure-sealed centrifugal water pump of claim 6, wherein: the pump shell is provided with a communicating pipe which is used for delivering the received pressure water with the pressure of P in the balance chamber of the pressure sealing type centrifugal water pump to a matching gap between the first shaft sleeve and the pump shaft so as to realize sealing and increase air leakage resistance.
8. The pressure-sealed centrifugal water pump of claim 7, wherein: the pump shell comprises a suction section, a middle section, a water outlet section, a packing box body and a communicating pipe, wherein the suction section, the middle section, the water outlet section and the packing box body are sequentially connected, one of the pressure sealing components is matched and connected with the packing box body of the suction section, and pressure water at a water suction side enters a chamber; the other pressure sealing component is matched and connected with the filler box body connected with the water outlet section and forms a pressure water inlet chamber at a drainage side; the first end of the communicating pipe is communicated with the water-absorbing side pressure water inlet chamber, the second end of the communicating pipe is communicated with the water-discharging side pressure water inlet chamber, water in the balance chamber of the pressure-sealed centrifugal water pump enters the water-discharging side pressure water inlet chamber through a gap between the corresponding box body and the pump shaft, then flows into the water-absorbing side pressure water inlet chamber through the communicating pipe, and then enters the water-absorbing pump water inlet through a gap between the corresponding box body and the pump shaft, so that sealing and air leakage resistance increase are realized.
9. The pressure-sealed centrifugal water pump of claim 8, wherein: a check valve is arranged in a balance water pipe of the pressure sealing type centrifugal water pump, so that the pressure of pressure water in a balance chamber is improved by the check valve.
10. The pressure-sealed centrifugal water pump of claim 9, wherein: the pressure sealed centrifugal water pump also comprises a pressure medium conveying pipe, wherein the pressure medium conveying pipe is provided with two output pipe heads and an input pipe head, the two output pipe heads are correspondingly connected with the two second shaft sleeves and are respectively communicated with the annular gaps between the corresponding second shaft sleeves and the annular deformation part; the input pipe head of the pressure medium conveying pipe is used for receiving pressure medium; the pressure sealing type centrifugal water pump also comprises a sealing control device, the sealing control device is connected with the pressure medium conveying pipe and the vacuumizing pipe of the pressure sealing type centrifugal water pump, and the sealing control device is used for conveying pressure media to the pressure medium conveying pipe so that the annular deformation piece of the pressure sealing assembly deforms under the pressure applying state of the pressure media, and the annular deformation piece is in contact with the pump shaft to realize sealing; the sealing control device is also used for discharging air in the pump shell by using the vacuum-pumping pipe to form negative pressure in the pump shell so as to enable water to enter the pump shell along the water suction pipe under the pressure of external atmospheric pressure; the sealing control device is also used for stopping pressure medium conveying and vacuum pumping after a preset time period after detecting that the pressure sealing type centrifugal water pump is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122465955.2U CN216009002U (en) | 2021-10-13 | 2021-10-13 | Pressure sealed centrifugal water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122465955.2U CN216009002U (en) | 2021-10-13 | 2021-10-13 | Pressure sealed centrifugal water pump |
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| Publication Number | Publication Date |
|---|---|
| CN216009002U true CN216009002U (en) | 2022-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122465955.2U Active CN216009002U (en) | 2021-10-13 | 2021-10-13 | Pressure sealed centrifugal water pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847249A (en) * | 2021-10-13 | 2021-12-28 | 宁夏金泉泵业有限责任公司 | Centrifugal water pump |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847249A (en) * | 2021-10-13 | 2021-12-28 | 宁夏金泉泵业有限责任公司 | Centrifugal water pump |
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