JP2005163646A - Connecting structure for pump piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To save space, simplify connecting work, and reduce cost for connection in a structure for connecting pipes to a pump. <P>SOLUTION: This connecting structure for a pump piping is for connecting a fluid pipe 15 to a pump equipped with a fluid pressure feed mechanism inside a casing 1. An opening part 3 formed on the casing 1 is provided as a valve chamber. Inside the valve chamber 3, a valve element 7 for preventing backflow of fluid and a spring 10 for being compressed and seating the valve element 7 on a valve seat of the opening part 3 are housed. This structure is for fixing the fluid pipe 15 to the opening part 3 with the spring 10 in a compressed state, and connecting it to the pump. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pump pipe connection structure used for connecting a pump and a pipe.

For example, some automobile transmissions are supplied with hydraulic pressure from an electric pump while the engine is stopped to assist in starting the automobile. Such an electric pump needs to be connected to the transmission by piping, and a check valve as shown in Patent Document 1, for example, is provided in the middle of the piping to prevent backflow. This check valve has a structure satisfying the check valve function as a single structure in which several valve parts are built in a valve case.
Japanese Patent Laid-Open No. 4-77070

  However, since the check valve itself has the above-described structure that satisfies the check valve function (structure provided with a valve case), the size of the check valve increases and a large space is required for its deployment. It takes.

  The pump pipe connection structure according to the present invention is a pump pipe connection structure in which a fluid pipe is connected to a pump having a fluid pumping mechanism inside the casing, and the casing includes an opening through which fluid from the fluid pumping mechanism flows. The opening is a valve chamber provided with a valve seat, and a valve body that prevents backflow of fluid is disposed inside the opening, and a spring that compresses and seats the valve body on the valve seat in the valve chamber. The pipe for fluid has a structure that is coupled and fixed to the opening of the casing, and the spring is compressed by this coupling.

  According to the pump pipe connection structure of the present invention, the casing also serves as the valve case and compresses the spring with the pipe for the fluid, so the valve case becomes unnecessary and the number of parts is reduced. Cost is reduced. Moreover, since it is not necessary to install a valve case on the casing, the space for installing the check valve is reduced.

  It is preferable that the fluid pipe is coupled to the opening of the casing by screwing a thread provided at the tip of the fluid piping to a thread provided on the inner peripheral surface of the opening of the casing. As the threaded portion, a male screw may be used at the tip of the fluid pipe, and a female screw may be used at the inner peripheral surface of the opening of the casing. It is more preferable that the casing and the fluid pipe are fixed by coupling both screw portions because the connection between the pump and the fluid pipe can be performed easily and quickly.

  According to the pump pipe connection structure of the present invention, space saving can be achieved, the number of parts can be reduced, and the cost can be reduced.

  An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view showing a check valve portion of a pump discharge portion of an electric pump for an automobile, and FIG. 2 is an exploded view showing the check valve portion of the pump discharge portion.

  In FIG. 1, 1 shows the casing of the electric pump for motor vehicles. The electric pump is configured to include a fluid pumping mechanism (not shown) such as a gear pump unit in order to supply oil to the transmission inside the casing 1. In the casing 1, an opening 3 that opens to the outside of the casing is formed as a valve chamber. An inlet passage 5 through which oil pumped from the fluid pumping mechanism flows is formed on the inlet side of the valve chamber 3. The diameter of the inlet passage 5 is set smaller than the diameter of the valve chamber 3, and the periphery of the inlet passage 5 (upstream side of the valve chamber 3) is a valve seat 6.

  In the valve chamber 3, a valve body 7 for preventing back flow of oil is slidably accommodated. The valve body 7 includes an upstream small-diameter portion 8 through which oil flows and a large-diameter portion 9 having an outer diameter substantially the same as the inner peripheral diameter of the valve chamber 3. It is formed in a substantially cylindrical shape having an open end. The distal end 8 a of the small diameter portion 8 is formed in a taper shape, and when the distal end 8 a comes into contact with the valve seat 6, the valve body 7 is seated on the valve seat 6 and closes the inlet passage 5.

  A communication hole 8 b for supplying oil that has entered the valve chamber 3 from the inlet passage 5 into the valve body 7 is formed in the small diameter portion 8 so as to communicate with the inside and outside of the small diameter portion 8. The large-diameter portion 9 is provided with a housing portion 9 b, and a coil spring 10 as a spring is housed in the housing portion 9 b, and one end 10 a of the coil spring 10 is disposed on the inner periphery of the large-diameter portion 9. It is in contact with the formed step 9a. Further, the other end 10 b of the coil spring 10 protrudes from the opening of the large diameter portion 9.

  A female screw 12 is formed at the rear of the opening of the casing 1 constituting the valve chamber 3, and is coupled to the opening of the casing 1 attached to the tip of a fluid pipe (hydraulic pipe) 15. A joint 16 as a structure to be fixed is connected. The joint 16 includes a male screw 17, a nut 18, and an O-ring 19 fitted to the base of the male screw 17, and a flow hole 16 a that communicates the inside of the valve body 7 and the hydraulic pipe 15 is formed at the center of the joint 16. Is formed. The male screw 17 is screwed into the female screw 12 of the casing 1, and a predetermined gap 19 that allows the valve body 7 to move backward is provided between the front end surface portion 17 a of the male screw 17 and the rear end surface 9 c of the large-diameter portion 9 of the valve body 7. In addition, the distal end surface portion 17a of the male screw 17 presses the other end 10b of the coil spring 10.

  The nut 18 abuts on the outer surface 1 a of the casing 1, and the O-ring 19 seals between the casing 1 and the joint 16. Since the coil spring 10 presses and urges the valve body 7 against the valve seat 6, the closed state of the inlet passage 5 is maintained. Here, the check valve is formed by the casing 1, the valve body 7, the coil spring 10 and the joint 16. The mechanism is configured.

  The joint 16 preferably employs a parallel male thread O-ring seal joint defined in JIS B 8363. Thus, since the JIS standard joint 16 is a ready-made one, it can easily function as a check valve. Note that the joint 16 may be provided with a parallel male screw that does not use an O-ring when there is no risk of oil leakage on the pipe. When the O-ring is not used, oil leakage can be prevented by managing the screw length to a predetermined length.

  When the electric pump having the above-described configuration is operated, oil is pumped into the inlet passage 5 of the casing 1 by the action of the fluid pumping mechanism, and this oil moves the valve body 7 backward against the elastic force of the coil spring 10. The front end surface portion 17a of the male screw 17 of the joint 16 also functions as a stopper for positioning the valve body 7 that moves backward. By the retraction of the valve body 7, the oil flows into the valve chamber 3, enters the valve body 7 through the communication hole 8 b of the valve body 7, passes through the flow hole 16 a of the joint 16 and the hydraulic pipe 15, To be supplied. Note that when the electric pump is stopped, the valve body 7 closes the inlet passage 5, so that the oil on the transmission side does not flow back to the electric pump side.

  When connecting the electric pump having the above-described configuration and the hydraulic pipe 15, the valve body 7 in which the coil spring 10 is accommodated is inserted into the valve chamber 3 of the casing 1 as shown in FIG. 2. Further, the male screw 17 of the joint 16 of the hydraulic pipe 15 is screwed into the female screw 12 of the casing 1. When the joint 16 is screwed in, the distal end surface portion 17a of the male screw 17 presses the other end 10b of the coil spring 10, and the distal end of the valve body 7 is seated on the valve seat by the elastic force of the coil spring 10. . Moreover, the male screw 17 of the joint 16 is fastened until the nut 18 abuts against the outer surface 1a of the casing 1, and the valve body 7 can be seated on the valve seat 6 with a predetermined pressing force, so that the assembly can be performed easily and quickly. .

  On the contrary, by loosening the joint 16 and removing the joint 16 from the casing 1, the valve body 7 and the coil spring 10 can be disassembled, and maintenance can be performed easily and quickly.

  The present embodiment eliminates the need for a valve case that is necessary for a conventional check valve, and the valve body 7 and the coil spring 10 accommodated in the casing 1 are fastened and assembled by the joint 16. Check valves can be installed in space. Moreover, since the joint 16 has a holding function of the coil spring 10 and a stopper function of the valve body 7, a member having these functions is unnecessary, and the number of parts can be reduced in combination with the need for the valve case, Minute cost is also reduced.

  The present invention is not limited to the embodiment described above. For example, the pump can be used for any type other than the electric pump. The fluid supplied by the pump may be a liquid other than oil or a gas.

Sectional drawing which shows the piping connection structure of the pump check valve part of this invention Exploded sectional view showing the pipe connection structure of the pump check valve part of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Casing 6 Valve seat 7 Valve body 10 Coil spring (spring)
15 Hydraulic piping (fluid piping)
17a Tip surface

Claims (2)

A pump pipe connection structure for connecting a pipe for fluid to a pump having a fluid pumping mechanism inside the casing,
The casing includes an opening through which the fluid from the fluid pumping mechanism flows, and the opening serves as a valve chamber including a valve seat, and inside the opening, a valve body that prevents backflow of fluid; And a spring that compresses and seats the valve body on the valve seat in the valve chamber,
The fluid piping has a structure that is fixed by being coupled to the opening of the casing, and the spring is compressed by this coupling. 2. The pump according to claim 1, wherein the fluid pipe is fixed to the opening of the casing by coupling a screw provided at the tip of the fluid pipe to a screw provided on the inner peripheral surface of the opening of the casing. Piping connection structure.

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