Forward valve closing tool and method for centrifugal booster pump

Abstract

The invention discloses a forward valve closing-in tool and method for a centrifugal booster pump, the closing-in tool comprises a base at the lower half part and a closing-in punch assembling assembly at the upper half part, and the closing-in punch assembling assembly is mainly composed of a punch, a lower ejector pin, a guide screw, a cylindrical spiral compression spring and an upper ejector rod; the tail end of the punch is provided with a necking forming guide groove, the upper ejector rod, the cylindrical spiral compression spring and the lower ejector pin are arranged in an inner hole of the punch, and the tail end of the guide screw is arranged in an axial guide groove in the surface of the lower ejector pin. During closing, the punch is clamped by the bench drill to move towards the forward valve until the head of the lower ejector pin enters an inner hole of a spring seat of the forward valve, and the punch continues to be moved to enable the upper end of the valve seat to enter a closing forming guide groove to complete closing. According to the closing device, the problem that a conventional closing device cannot close up due to the fact that the spring seat is higher than the upper end of the valve seat is solved, the forward valve can be closed up quickly, simply and safely, the closing-up quality of the valve is guaranteed, and the surfaces of all assemblies in the forward valve are not crushed or scratched.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of positive valve closing tooling for centrifugal booster pump and closing method, belong to tooling design technical field. BACKGROUND

[0002] As Figure 1 As shown in a kind of positive valve structure for centrifugal booster pump, the positive valve is composed of valve body 1, steel ball 2, valve seat 3, spring 4, adjusting washer 5 and spring seat 6, wherein the thickness of adjusting washer 5 needs to be selected according to the opening pressure of positive valve, and the thickness value is between 0-0.5.

[0003] The assembly sequence of positive valve is as Figure 2 shown: assembler first assembles steel ball 2 into the inner hole of valve body 1, then sequentially installs valve seat 3, spring 4 and adjusting washer 5 (the thickness of adjusting washer 5 needs to be selected according to the opening pressure of positive valve, and the thickness value is between 0-0.5), and finally installs spring seat 6. After the assembly of positive valve is completed, the upper end of valve body 1 is closed, and the spring seat 6 is fixed in the stepped hole at the upper end of valve body 1. Figure 3

[0004] Before the upper end of valve body 1 is closed after the assembly of positive valve is completed, the assembly dimensions of each part are as Figure 4 shown, wherein: the inner hole stepped depth H0 of valve body 1 =9, the diameter of steel ball 2 in the inner hole of valve body is φ2.4, after the steel ball 2 with a diameter of φ3 is assembled into the inner hole of valve body with a diameter of φ2.4, the remaining height H1 of steel ball 2 is 2.4, the thickness H2 of valve seat 3 is 1.2, the free height H3 of spring 4 is 7, the thickness H4 of adjusting washer 5 is 0-0.5, and the thickness H5 of spring seat 6 is 0.5. The total height dimension H0' of steel ball 2, valve seat 3, spring 4, adjusting washer 5 and spring seat 6 after assembly is H1+H2+H3+H4+H5=11.1-11.6>H0, and it can be known from the above calculation that: after the assembly of positive valve is completed, the spring seat 6 is higher than the upper end surface of valve body 1 (see Figure 4 ), at this time, it is more difficult to close the upper end of valve body 1 by using ordinary closing tool. The size unit is millimeter (mm). SUMMARY

[0005] The present application aims to provide a kind of positive valve closing tooling and method for centrifugal booster pump, solve the problem of difficult closing of positive valve caused by the spring seat being higher than the upper end surface of valve body mentioned in the background, and can quickly, simply and safely close the valve of this type, and can ensure the closing quality of valve.

[0006] To achieve the above object, the present application adopts the following technical scheme: The positive valve closing tooling for centrifugal booster pump comprises:​ a base, an upper end surface of the base is provided with a positioning groove, and an inner diameter of the positioning groove is not less than a maximum outer diameter of a valve body in the centrifugal booster pump; a closing punch assembly, which is independent of the base and located above the base, and the closing punch assembly comprises: a punch, which is provided with a closing forming guide groove on a terminal end surface corresponding to the upper end surface of the base, an inner diameter of the closing forming guide groove matches an outer diameter of a closing position of an upper end of a valve seat in the centrifugal booster pump, a blind hole is provided on a groove bottom of the closing forming guide groove, a threaded through hole is provided on a circumferential surface of the punch, and the threaded through hole is communicated with the blind hole; an upper ejector rod, which is assembled in the blind hole of the punch and located at a hole bottom of the blind hole; a lower ejector pin, which is assembled in the blind hole of the punch and located at a hole opening of the blind hole, a circumferential surface of the lower ejector pin has an axial guide groove, and an outer diameter of a head portion of the lower ejector pin matches an inner hole diameter of a spring seat in the centrifugal booster pump; a cylindrical helical compression spring, which is assembled in the blind hole of the punch, and the cylindrical helical compression spring is located between the upper ejector rod and the lower ejector pin, and a spring force of the cylindrical helical compression spring is greater than a spring force of a spring in the centrifugal booster pump; a guide screw, which is installed in the threaded through hole of the punch, and a terminal end of the guide screw is located in the axial guide groove of the lower ejector pin.

[0007] As an option, a through hole is provided on a groove bottom surface of the positioning groove of the base, and the through hole penetrates a lower end surface of the base.

[0008] As an option, the upper end of the punch is connected with a bench drill.

[0009] As an option, a clearance fit is formed between the guide screw and the axial guide groove of the lower ejector pin.

[0010] A closing method for a forward valve of a centrifugal booster pump, which adopts the closing tooling mentioned above and comprises the following steps: Step one, positioning the forward valve in the positioning groove on the upper end surface of the base; Step two, clamping the upper end of the punch in the closing punch assembly in a chuck of the bench drill, manually operating the bench drill to move the punch downward, and aligning the head portion of the lower ejector pin in the blind hole of the punch with an inner hole of a spring seat in the forward valve; Step three, continuously operating the bench drill to move the punch downward and apply a downward pressure on the punch, so that the closing forming guide groove on the lower end of the punch extrudes the upper end thin wall portion of the valve body in the forward valve toward the center of the valve body to form a closing, thereby fixing the spring seat in the stepped hole on the upper end of the valve body; Step four, operating the bench drill to move the punch upward, and taking the forward valve out of the positioning groove of the base, thereby completing the closing work.

[0011] Compared with the prior art, the application provides a closing tool applicable to the type of valve (i.e. the case where the spring seat is higher than the upper end surface of the valve body after the valve is assembled), and the relative position relationship between the spring seat and the upper end closing position of the valve body is kept unchanged during the closing process by controlling the elastic force relationship between the cylindrical helical compression spring in the closing tool and the spring in the valve. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Structure diagram of a forward valve for a centrifugal booster pump; Figure 2 Assembly process diagram of a forward valve for a centrifugal booster pump; Figure 3 Diagram of a forward valve for a centrifugal booster pump after the upper end is closed; Figure 4 Diagram of assembly dimensions of each part of a forward valve for a centrifugal booster pump; Figure 5 Diagram of a closing tool for a forward valve; Figure 6 Diagram of positioning of a forward valve on a base; Figure 7 Diagram of alignment of the inner hole of the spring seat in a forward valve by the head of the lower pin in the closing tool; Figure 8 Diagram of a closing process of a forward valve by the closing tool; Figure 9 Diagram of removal of a forward valve from a base after the closing process is completed; In the drawings: 1 - valve body, 2 - steel ball, 3 - valve seat, 4 - spring, 5 - adjusting washer, 6 - spring seat, 11 - base, 12 - punch, 13 - lower pin, 14 - guide screw, 15 - cylindrical helical compression spring, 16 - upper pin, H0 - depth of the step of the inner hole of the valve body, H0' - total height dimension of the assembled steel ball, valve seat, spring, adjusting washer and spring seat, H1 - remaining height of the steel ball after the steel ball with a diameter of φ3 is assembled into the inner hole of the valve body with a diameter of φ2.4, H2 - thickness of the valve seat, H3 - free height of the spring, H4 - thickness of the adjusting washer, H5 - thickness of the spring seat. DETAILED DESCRIPTION

[0013] The application will be further described in conjunction with the accompanying drawings and specific embodiments, but should not be understood as the scope of the subject matter described herein is limited to the following embodiments, any modifications, substitutions and changes made according to the ordinary technical knowledge and common practice in the art without departing from the above technical idea of the application are included in the scope of the application.

[0014] According to Figures 1-4 the structural features of the forward valve for centrifugal booster pump shown in the drawings, the application designs a necking tool for the forward valve as shown in Figure 5 The necking tool for the forward valve contains two independent parts, the lower half is the base 11 and the upper half is the necking punch assembly.

[0015] As shown in Figures 5-9 , the necking punch assembly contains the punch 12, the lower ejector pin 13, the guide screw 14, the cylindrical helical compression spring 15 and the upper ejector rod 16. The upper end of the punch 12 can be clamped on the bench drill, the lower end of the punch 12 is processed with a necking forming guide groove, the guide screw 14 is assembled on the punch 12 through the threaded hole on the punch 12. The upper ejector rod 16, the cylindrical helical compression spring 15 and the lower ejector pin 13 are assembled in the inner hole of the punch 12 and can move up and down, wherein the lower ejector pin 13 is processed with an axial guide groove, by screwing in the guide screw 14, the head of the guide screw 14 enters the guide groove and forms a clearance fit with the guide groove, the guide screw 14 prevents the upper ejector rod 16, the cylindrical helical compression spring 15 and the lower ejector pin 13 assembled in the inner hole of the punch 12 from falling out of the inner hole of the punch 12, while ensuring the flexible movement of the upper ejector rod 16, the cylindrical helical compression spring 15 and the lower ejector pin 13 in the inner hole of the punch 12. The elastic force of the cylindrical helical compression spring 15 assembled in the inner hole of the punch 12 is greater than Figure 1 the elastic force of the spring 4.

[0016] When the forward valve shown in Figure 1 is necked, the necking method includes the following steps: Step 1: According to Figure 6 , the forward valve is positioned in the stepped hole (positioning groove) on the upper end surface of the base 11.

[0017] Step 2: According to Figure 7 , the upper end of the punch 12 in the necking punch assembly is clamped on the drill chuck of the ordinary bench drill, the bench drill is manually operated to move the punch 12 downward, and the head of the lower ejector pin 13 in the inner hole of the punch 12 is aligned with the inner hole of the spring seat 6 in the forward valve.

[0018] Step 3: According to Figure 8, continue operating the bench drill to move the punch 12 downward and apply downward pressure on the punch 12, and the closed-die forming guide groove at the lower end of the punch 12 extrudes the upper end thin wall part of the valve body 1 towards the center of the valve body 1 to form a closed die, thereby fixing the spring seat 6 in the stepped hole at the upper end of the valve body 1.

[0019] In this step, the key to the closed-die forming guide groove at the lower end of the punch 12 to extrude the upper end of the valve body 1 is that the spring force of the cylindrical helical compression spring 15 installed in the inner hole of the punch 12 is greater than Figure 1 The spring force of the spring 4 in the forward valve, so during the process of moving the punch 12 downward by operating the bench drill, the lower ejector pin 13 installed in the inner hole of the punch 12 can push Figure 8 The spring seat 6 is pushed into the stepped hole at the upper end of the valve body 1, and the spring force of the cylindrical helical compression spring 15 continuously acts on the spring seat 6 through the lower ejector pin 13 to keep the position of the spring seat 6 unchanged, and during the process of continuously moving the punch 12 downward, the downward pressure on the punch 12 is applied by operating the bench drill, and the extrusion of the upper end thin wall part of the valve body 1 is completed, and during this process, the related parts will not be damaged.

[0020] Step 4: according to Figure 9 , the punch 12 is moved upward by operating the bench drill, and the forward valve is removed from the stepped hole of the base 11, and thus the closed-die forming work of the forward valve is completed.

[0021] The advantages of the present application are: by combining the structural features of the forward valve for the centrifugal booster pump, the closed-die forming tool for the forward valve is reasonably designed, the punch 12 is clamped on the drill chuck of the bench drill, and one operator can easily complete the closed-die forming work of the forward valve, there is no safety problem during the closed-die forming process, there is no problem of pressing and scratching the surface of the forward valve parts, the closed-die forming work of the forward valve is time-saving and labor-saving, and it is convenient and fast.

[0022] The skilled person in the art can make various adjustments to the present application according to the actual situation. The general principles defined in the present application can be implemented in other embodiments without departing from the scope. Therefore, the present application will not be limited to the structure shown in the specific embodiments, but will conform to the widest scope consistent with the principles and characteristics set forth in the claims of the present application.

Claims

1. A positive valve closing fixture for a centrifugal booster pump, characterized in that, include: The base (11) has a positioning groove on its upper end face, and the inner diameter of the positioning groove is not less than the maximum outer diameter of the valve body (1) in the centrifugal booster pump. A closing punch assembly, the closing punch assembly being independent of the base (11) and located above the base (11), the closing punch assembly comprising: Punch (12), the punch (12) has a closing forming guide groove machined on the end face of the upper end face of the base (11), the inner diameter of the closing forming guide groove matches the outer diameter of the closing position of the valve seat (1) in the centrifugal booster pump, the bottom of the closing forming guide groove has a blind hole, the circumferential surface of the punch (12) has a threaded through hole, and the threaded through hole is connected to the blind hole; Upper push rod (16), said upper push rod (16) is assembled in the blind hole of the punch and is located at the bottom of the blind hole; The lower ejector pin (13) is assembled in the blind hole of the punch and is located at the opening of the blind hole. The circumferential surface of the lower ejector pin (13) has an axial guide groove. The outer diameter of the head of the lower ejector pin (13) matches the inner diameter of the spring seat (6) in the centrifugal booster pump. A cylindrical helical compression spring (15) is assembled in the blind hole of the punch, and the cylindrical helical compression spring (15) is located between the upper push rod (16) and the lower push pin (13), and the elastic force of the cylindrical helical compression spring (15) is greater than the elastic force of the spring (4) in the centrifugal booster pump. A guide screw (14) is installed in the threaded through hole of the punch (12) and the end of the guide screw (14) is placed in the axial guide groove of the lower ejector pin (13).

2. The positive valve closing fixture for a centrifugal booster pump according to claim 1, characterized in that: The bottom surface of the positioning groove of the base (11) has a through hole, and the through hole penetrates the lower end surface of the base (11).

3. The positive valve closing fixture for a centrifugal booster pump according to claim 1, characterized in that, The upper end of the punch (12) is connected to the bench drill.

4. The positive valve closing fixture for a centrifugal booster pump according to claim 1, characterized in that: The guide screw (14) and the axial guide groove of the lower ejector pin (13) are in clearance fit.

5. A method for closing a centrifugal booster pump using a positive valve, characterized in that: The finishing fixture described in claim 1 is used, and includes the following steps: Step 1: Position the forward valve in the positioning groove on the upper surface of the base (11); Step 2: Clamp the upper end of the punch (12) in the closing punch assembly onto the drill chuck of the bench drill, manually operate the bench drill to move the punch (12) downward, and align the head of the lower ejector pin (13) in the blind hole of the punch (12) with the inner hole of the spring seat (6) in the forward valve. Step 3: Continue operating the bench drill to move the punch (12) downward and apply downward pressure to the punch (12), so that the closing forming guide groove at the lower end of the punch (12) will squeeze the upper thin-walled part of the valve body (1) in the positive valve towards the center of the valve body (1) to form a closing, thereby fixing the spring seat (6) in the stepped hole at the upper end of the valve body (1). Step 4: Operate the bench drill to move the punch (12) upward and remove the forward valve from the positioning slot of the base (11) to complete the closing work.

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